summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--usb-serial-rs485/LICENSE165
-rw-r--r--usb-serial-rs485/Makefile.stm32f103-generic38
-rw-r--r--usb-serial-rs485/Makefile.stm32f4-disco38
-rw-r--r--usb-serial-rs485/README33
-rw-r--r--usb-serial-rs485/main-stm32f103-generic.c204
-rw-r--r--usb-serial-rs485/main-stm32f4-disco.c199
-rw-r--r--usb-serial-rs485/ringb.c59
-rw-r--r--usb-serial-rs485/ringb.h60
-rw-r--r--usb-serial-rs485/syscfg.h59
-rw-r--r--usb-serial-rs485/usb_cdcacm-arch.c82
-rw-r--r--usb-serial-rs485/usb_cdcacm.c363
-rw-r--r--usb-serial-rs485/usb_cdcacm.h74
12 files changed, 1374 insertions, 0 deletions
diff --git a/usb-serial-rs485/LICENSE b/usb-serial-rs485/LICENSE
new file mode 100644
index 0000000..65c5ca8
--- /dev/null
+++ b/usb-serial-rs485/LICENSE
@@ -0,0 +1,165 @@
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+ This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+ 0. Additional Definitions.
+
+ As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+ "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+ An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+ A "Combined Work" is a work produced by combining or linking an
+Application with the Library. The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+ The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+ The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+ 1. Exception to Section 3 of the GNU GPL.
+
+ You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+ 2. Conveying Modified Versions.
+
+ If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+ a) under this License, provided that you make a good faith effort to
+ ensure that, in the event an Application does not supply the
+ function or data, the facility still operates, and performs
+ whatever part of its purpose remains meaningful, or
+
+ b) under the GNU GPL, with none of the additional permissions of
+ this License applicable to that copy.
+
+ 3. Object Code Incorporating Material from Library Header Files.
+
+ The object code form of an Application may incorporate material from
+a header file that is part of the Library. You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+ a) Give prominent notice with each copy of the object code that the
+ Library is used in it and that the Library and its use are
+ covered by this License.
+
+ b) Accompany the object code with a copy of the GNU GPL and this license
+ document.
+
+ 4. Combined Works.
+
+ You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+ a) Give prominent notice with each copy of the Combined Work that
+ the Library is used in it and that the Library and its use are
+ covered by this License.
+
+ b) Accompany the Combined Work with a copy of the GNU GPL and this license
+ document.
+
+ c) For a Combined Work that displays copyright notices during
+ execution, include the copyright notice for the Library among
+ these notices, as well as a reference directing the user to the
+ copies of the GNU GPL and this license document.
+
+ d) Do one of the following:
+
+ 0) Convey the Minimal Corresponding Source under the terms of this
+ License, and the Corresponding Application Code in a form
+ suitable for, and under terms that permit, the user to
+ recombine or relink the Application with a modified version of
+ the Linked Version to produce a modified Combined Work, in the
+ manner specified by section 6 of the GNU GPL for conveying
+ Corresponding Source.
+
+ 1) Use a suitable shared library mechanism for linking with the
+ Library. A suitable mechanism is one that (a) uses at run time
+ a copy of the Library already present on the user's computer
+ system, and (b) will operate properly with a modified version
+ of the Library that is interface-compatible with the Linked
+ Version.
+
+ e) Provide Installation Information, but only if you would otherwise
+ be required to provide such information under section 6 of the
+ GNU GPL, and only to the extent that such information is
+ necessary to install and execute a modified version of the
+ Combined Work produced by recombining or relinking the
+ Application with a modified version of the Linked Version. (If
+ you use option 4d0, the Installation Information must accompany
+ the Minimal Corresponding Source and Corresponding Application
+ Code. If you use option 4d1, you must provide the Installation
+ Information in the manner specified by section 6 of the GNU GPL
+ for conveying Corresponding Source.)
+
+ 5. Combined Libraries.
+
+ You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+ a) Accompany the combined library with a copy of the same work based
+ on the Library, uncombined with any other library facilities,
+ conveyed under the terms of this License.
+
+ b) Give prominent notice with the combined library that part of it
+ is a work based on the Library, and explaining where to find the
+ accompanying uncombined form of the same work.
+
+ 6. Revised Versions of the GNU Lesser General Public License.
+
+ The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+ Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+ If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
diff --git a/usb-serial-rs485/Makefile.stm32f103-generic b/usb-serial-rs485/Makefile.stm32f103-generic
new file mode 100644
index 0000000..747238d
--- /dev/null
+++ b/usb-serial-rs485/Makefile.stm32f103-generic
@@ -0,0 +1,38 @@
+##
+## This file is part of the libopencm3 project.
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library. If not, see <http://www.gnu.org/licenses/>.
+##
+
+BOARD = stm32f103-generic
+PROJECT = usb-serial-rs485-$(BOARD)
+BUILD_DIR = bin-$(BOARD)
+
+SHARED_DIR = ../../shared
+
+CFILES = main-$(BOARD).c
+CFILES += usb_cdcacm.c usb_cdcacm-arch.c
+CFILES += ringb.c
+CFILES += trace.c trace_stdio.c
+
+VPATH += $(SHARED_DIR)
+INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR))
+OPENCM3_DIR=../../libopencm3
+
+# Copy this to some arch shared?
+DEVICE=stm32f103c8
+OOCD_FILE= ../../openocd/openocd.stm32f4-disco.cfg
+
+include ../../rules.mk
+
diff --git a/usb-serial-rs485/Makefile.stm32f4-disco b/usb-serial-rs485/Makefile.stm32f4-disco
new file mode 100644
index 0000000..1c60091
--- /dev/null
+++ b/usb-serial-rs485/Makefile.stm32f4-disco
@@ -0,0 +1,38 @@
+##
+## This file is part of the libopencm3 project.
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library. If not, see <http://www.gnu.org/licenses/>.
+##
+
+BOARD = stm32f4-disco
+PROJECT = usb-serial-rs485-$(BOARD)
+BUILD_DIR = bin-$(BOARD)
+
+SHARED_DIR = ../../shared
+
+CFILES = main-$(BOARD).c
+CFILES += usb_cdcacm.c usb_cdcacm-arch.c
+CFILES += ringb.c
+CFILES += trace.c trace_stdio.c
+
+VPATH += $(SHARED_DIR)
+INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR))
+OPENCM3_DIR=../../libopencm3
+
+# Copy this to some arch shared?
+DEVICE=stm32f405xg
+OOCD_FILE= ../../openocd/openocd.stm32f4-disco.cfg
+
+include ../../rules.mk
+
diff --git a/usb-serial-rs485/README b/usb-serial-rs485/README
new file mode 100644
index 0000000..0e5b2cd
--- /dev/null
+++ b/usb-serial-rs485/README
@@ -0,0 +1,33 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+current status:
+f1: frootloop3 gets corrupt data in rx path, _after_ serial rx,
+but the usb in packets (wireshark) show the corruption. (LA on serial lines is clean)
+f4: frootloop3 tests clean
+=> suspect libopecm3 usb bug?
+
+frootloop3: github.com/karlp/frootloop3
+
+
+
+This implements a USB CDC-ACM device, connected to USART2 (PA2-tx/PA3-rx)
+An interrupt driven tx ring buffer is used for usb->serial, and a similar
+interrupt driven rx ring buffer is used for serial->usb.
+Baud rates from 2400-460800 are tested with zmodem transfers in both directions.
+
+Parity not yet finished, and baudrates below 1200 need fiddling with clock prescalers.
+When it's finished, rs485 support should be available via the TC interrupt.
+
+A GPIO is toggled around USART transmissions to control an RS485 line
+transceiver, following ST's app note. The RS485 driver enable line is,
+by default, just the onboard red LEDs.
+
+The orange/blue LEDs indicate tx/rx activity, but especially for the rx line,
+you won't really see it without heavy data rates.
+
+This example is heavily based on the existing usb_cdcacm and usart demos.
+
+
+KARL - check https://github.com/dhylands/libopencm3-usb-serial/blob/master/usb.c to see if it passes the same tests or not
diff --git a/usb-serial-rs485/main-stm32f103-generic.c b/usb-serial-rs485/main-stm32f103-generic.c
new file mode 100644
index 0000000..415a18b
--- /dev/null
+++ b/usb-serial-rs485/main-stm32f103-generic.c
@@ -0,0 +1,204 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/usart.h>
+
+#include <stdio.h>
+#include "syscfg.h"
+#include "usb_cdcacm.h"
+#include "ringb.h"
+#include "trace.h"
+
+#define ER_DEBUG
+#ifdef ER_DEBUG
+#define ER_DPRINTF(fmt, ...) \
+ do { printf(fmt, ## __VA_ARGS__); } while (0)
+#else
+#define ER_DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
+
+static inline void gpio_really(uint32_t port, uint16_t pin, const bool set)
+{
+ int shift = set ? 0 : 16;
+ GPIO_BSRR(port) = pin << shift;
+}
+
+
+extern struct ringb rx_ring, tx_ring;
+static void usart_setup(void)
+{
+ /* Enable the USART2 interrupt. */
+ nvic_enable_irq(NVIC_USART2_IRQ);
+
+ /* USART2 pins are on port A */
+ rcc_periph_clock_enable(RCC_GPIOA);
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
+ gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
+ GPIO_CNF_INPUT_PULL_UPDOWN, GPIO_USART2_RX);
+
+ /* Enable clocks for USART2. */
+ rcc_periph_clock_enable(RCC_USART2);
+
+ /* Setup USART2 parameters. */
+ usart_set_baudrate(USART2, 115200);
+ usart_set_databits(USART2, 8);
+ usart_set_stopbits(USART2, USART_STOPBITS_1);
+ usart_set_mode(USART2, USART_MODE_TX_RX);
+ usart_set_parity(USART2, USART_PARITY_NONE);
+ usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
+
+ /* Enable USART2 Receive interrupt. */
+ usart_enable_rx_interrupt(USART2);
+
+ /* Finally enable the USART. */
+ usart_enable(USART2);
+}
+
+void usart2_isr(void)
+{
+ gpio_really(GPIOA, GPIO5, 1);
+ // usbser-rxne()
+ /* Check if we were called because of RXNE. */
+ if (usart_get_interrupt_source(USART2, USART_SR_RXNE)) {
+ gpio_set(LED_RX_PORT, LED_RX_PIN);
+ uint8_t c = usart_recv(USART2);
+ if (ringb_put(&rx_ring, c)) {
+ // good,
+ } else {
+ // fatal, you should always have drained by now.
+ // (when you've got it all ironed out, _actually_
+ // just drop and count drops), but not yet...
+ ER_DPRINTF("rx buffer full\n");
+ while(1);
+ }
+ trace_send8(STIMULUS_RING_PUSH, c);
+ gpio_clear(LED_RX_PORT, LED_RX_PIN);
+ }
+ // usbser-irq-txe()
+ if (usart_get_interrupt_source(USART2, USART_SR_TXE)) {
+ if (ringb_depth(&tx_ring) == 0) {
+ // turn off tx empty interrupts, nothing left to send
+ cdcacm_arch_txirq(0, 0);
+ ER_DPRINTF("OFF\n");
+ // Turn on tx complete interrupts, for rs485 de
+ USART_CR1(USART2) |= USART_CR1_TCIE;
+ } else {
+ int c = ringb_get(&tx_ring);
+ usart_send(USART2, c);
+ }
+ }
+ // usbser-irq-txc? rs485 is auto on some devices, but can be emulated anyway
+ if (usart_get_interrupt_source(USART2, USART_SR_TC)) {
+ ER_DPRINTF("TC");
+ // turn off the complete irqs, we're done now.
+ USART_CR1(USART2) &= ~USART_CR1_TCIE;
+ USART_SR(USART2) &= ~USART_SR_TC;
+ cdcacm_arch_pin(0, CDCACM_PIN_RS485DE, 0);
+ }
+ gpio_really(GPIOA, GPIO5, 0);
+}
+
+void usb_cdcacm_setup_pre_arch(void)
+{
+ // Hack to reenumerate
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
+ gpio_clear(GPIOA, GPIO12);
+ for (unsigned int i = 0; i < 800000; i++) {
+ __asm__("nop");
+ }
+}
+
+void usb_cdcacm_setup_post_arch(usbd_device *dev)
+{
+ (void)dev;
+}
+
+void cdcacm_arch_pin(int port, enum cdcacm_pin pin, bool set)
+{
+ (void)port; // TODO if you want to handle multiple ports
+ switch (pin) {
+ case CDCACM_PIN_LED_TX:
+ gpio_really(LED_TX_PORT, LED_TX_PIN, set);
+ break;
+ case CDCACM_PIN_LED_RX:
+ gpio_really(LED_RX_PORT, LED_RX_PIN, set);
+ break;
+ case CDCACM_PIN_RS485DE:
+ gpio_really(RS485DE_PORT, RS485DE_PIN, set);
+ break;
+ default:
+ break;
+ }
+}
+
+void cdcacm_arch_txirq(int port, bool set) {
+ (void)port; //FIXME if you make this multi port
+ if (set) {
+ usart_enable_tx_interrupt(USART2);
+ } else {
+ usart_disable_tx_interrupt(USART2);
+ }
+}
+
+void cdcacm_arch_set_line_state(int port, uint8_t dtr, uint8_t rts)
+{
+ (void)port; // FIXME if you want multiple ports
+ (void) dtr;
+ (void) rts;
+ // LM4f has an implementation of this if you're keen
+}
+
+
+
+
+int main(void)
+{
+ rcc_clock_setup_in_hse_8mhz_out_72mhz();
+ ER_DPRINTF("And we're alive!\n");
+ /* Led */
+ rcc_periph_clock_enable(RCC_GPIOC);
+ gpio_set_mode(LED_RX_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_RX_PIN);
+ // IRQ timing
+ rcc_periph_clock_enable(RCC_GPIOA);
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO5);
+ gpio_set_mode(RS485DE_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, RS485DE_PIN);
+
+ usart_setup();
+
+ usb_cdcacm_setup_pre_arch();
+ usbd_device *usbd_dev = usb_cdcacm_init(&st_usbfs_v1_usb_driver,
+ "stm32f103-generic");
+ usb_cdcacm_setup_post_arch(usbd_dev);
+
+
+ ER_DPRINTF("Looping...\n");
+ volatile int i = 0;
+ while (1) {
+ usbd_poll(usbd_dev);
+ usb_cdcacm_poll(usbd_dev);
+ }
+
+}
+
diff --git a/usb-serial-rs485/main-stm32f4-disco.c b/usb-serial-rs485/main-stm32f4-disco.c
new file mode 100644
index 0000000..ac3cdff
--- /dev/null
+++ b/usb-serial-rs485/main-stm32f4-disco.c
@@ -0,0 +1,199 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/usart.h>
+
+#include <stdio.h>
+#include "syscfg.h"
+#include "usb_cdcacm.h"
+#include "ringb.h"
+#include "trace.h"
+
+#define ER_DEBUG
+#ifdef ER_DEBUG
+#define ER_DPRINTF(fmt, ...) \
+ do { printf(fmt, ## __VA_ARGS__); } while (0)
+#else
+#define ER_DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
+
+static inline void gpio_really(uint32_t port, uint16_t pin, const bool set)
+{
+ int shift = set ? 0 : 16;
+ GPIO_BSRR(port) = pin << shift;
+}
+
+extern struct ringb rx_ring, tx_ring;
+static void usart_setup(void)
+{
+ /* Enable the USART2 interrupt. */
+ nvic_enable_irq(NVIC_USART2_IRQ);
+
+ /* USART2 pins are on port A */
+ rcc_periph_clock_enable(RCC_GPIOA);
+ gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2 | GPIO3);
+ gpio_set_af(GPIOA, GPIO_AF7, GPIO2 | GPIO3);
+
+ /* Enable clocks for USART2. */
+ rcc_periph_clock_enable(RCC_USART2);
+
+ /* Setup USART2 parameters. */
+ usart_set_baudrate(USART2, 115200);
+ usart_set_databits(USART2, 8);
+ usart_set_stopbits(USART2, USART_STOPBITS_1);
+ usart_set_mode(USART2, USART_MODE_TX_RX);
+ usart_set_parity(USART2, USART_PARITY_NONE);
+ usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
+
+ /* Enable USART2 Receive interrupt. */
+ usart_enable_rx_interrupt(USART2);
+
+ /* Finally enable the USART. */
+ usart_enable(USART2);
+}
+
+void usart2_isr(void)
+{
+ gpio_really(GPIOA, GPIO5, 1);
+ // usbser-rxne()
+ /* Check if we were called because of RXNE. */
+ if (usart_get_flag(USART2, USART_SR_RXNE)) {
+ gpio_set(LED_RX_PORT, LED_RX_PIN);
+ uint8_t c = usart_recv(USART2);
+ if (ringb_put(&rx_ring, c)) {
+ // good,
+ } else {
+ // fatal, you should always have drained by now.
+ // (when you've got it all ironed out, _actually_
+ // just drop and count drops), but not yet...
+ ER_DPRINTF("rx buffer full\n");
+ while(1);
+ }
+ gpio_clear(LED_RX_PORT, LED_RX_PIN);
+ }
+ // usbser-irq-txe()
+ if (usart_get_flag(USART2, USART_SR_TXE)) {
+ if (ringb_depth(&tx_ring) == 0) {
+ // turn off tx empty interrupts, nothing left to send
+ usart_disable_tx_interrupt(USART2);
+ ER_DPRINTF("OFF\n");
+ // Turn on tx complete interrupts, for rs485 de
+// USART_CR1(USART2) |= ~USART_CR1_TCIE;
+ } else {
+ int c = ringb_get(&tx_ring);
+ usart_send(USART2, c);
+ }
+ }
+ // usbser-irq-txc? rs485 is auto on some devices, but can be emulated anyway
+// if (usart_get_flag(USART2, USART_SR_TC)) {
+// ER_DPRINTF("TC");
+// // turn off the complete irqs, we're done now.
+// USART_SR(USART2) &= ~USART_SR_TC;
+// USART_CR1(USART2) &= ~USART_CR1_TCIE;
+// gpio_clear(LED_TX_PORT, LED_TX_PIN);
+// gpio_clear(RS485DE_PORT, RS485DE_PIN);
+// }
+ gpio_really(GPIOA, GPIO5, 0);
+}
+
+void usb_cdcacm_setup_pre_arch(void)
+{
+ rcc_periph_clock_enable(RCC_GPIOA);
+ rcc_periph_clock_enable(RCC_OTGFS);
+
+ gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
+ GPIO9 | GPIO11 | GPIO12);
+ gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO11 | GPIO12);
+
+}
+
+void usb_cdcacm_setup_post_arch(usbd_device *dev)
+{
+ (void)dev;
+}
+
+
+void cdcacm_arch_pin(int port, enum cdcacm_pin pin, bool set)
+{
+ (void)port; // TODO if you want to handle multiple ports
+ switch (pin) {
+ case CDCACM_PIN_LED_TX:
+ gpio_really(LED_TX_PORT, LED_TX_PIN, set);
+ break;
+ case CDCACM_PIN_LED_RX:
+ gpio_really(LED_RX_PORT, LED_RX_PIN, set);
+ break;
+ case CDCACM_PIN_RS485DE:
+ gpio_really(RS485DE_PORT, RS485DE_PIN, set);
+ break;
+ default:
+ break;
+ }
+}
+
+void cdcacm_arch_txirq(int port, bool set) {
+ (void)port; //FIXME if you make this multi port
+ if (set) {
+ usart_enable_tx_interrupt(USART2);
+ } else {
+ usart_disable_tx_interrupt(USART2);
+ }
+}
+
+void cdcacm_arch_set_line_state(int port, uint8_t dtr, uint8_t rts)
+{
+ (void)port; // FIXME if you want multiple ports
+ (void) dtr;
+ (void) rts;
+ // LM4f has an implementation of this if you're keen
+}
+
+
+int main(void)
+{
+ rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
+ ER_DPRINTF("And we're alive!\n");
+ /* Leds and rs485 are on port D */
+ rcc_periph_clock_enable(RCC_GPIOD);
+ gpio_mode_setup(LED_RX_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
+ LED_RX_PIN | LED_TX_PIN);
+ gpio_mode_setup(RS485DE_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
+ RS485DE_PIN);
+
+ rcc_periph_clock_enable(RCC_GPIOA);
+ gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO5);
+
+ usart_setup();
+ usb_cdcacm_setup_pre_arch();
+ usbd_device *usbd_dev = usb_cdcacm_init(&otgfs_usb_driver, "stm32f4-disco");
+ usb_cdcacm_setup_post_arch(usbd_dev);
+
+ ER_DPRINTF("Looping...\n");
+ volatile int i = 0;
+ while (1) {
+ usbd_poll(usbd_dev);
+ usb_cdcacm_poll(usbd_dev);
+ }
+
+}
+
diff --git a/usb-serial-rs485/ringb.c b/usb-serial-rs485/ringb.c
new file mode 100644
index 0000000..245325b
--- /dev/null
+++ b/usb-serial-rs485/ringb.c
@@ -0,0 +1,59 @@
+
+#include "ringb.h"
+void ringb_init(struct ringb *ring, uint8_t *buf, int len)
+{
+ ring->buf_len = len;
+ ring->buf = buf;
+ ring->idx_r = 0;
+ ring->idx_w = 0;
+}
+
+int ringb_get(struct ringb *ring) {
+#if 1
+ int rval;
+ if (ring->idx_r != ring->idx_w) {
+ rval = ring->buf[ring->idx_r];
+ ring->idx_r = (ring->idx_r + 1) % ring->buf_len;
+ return rval;
+ }
+ return -1;
+#else
+ if (((ring->idx_w - ring->idx_r) % ring->buf_len) >= 0) {
+ int rval = ring->buf[ring->idx_r];
+ ring->idx_r = (ring->idx_r + 1) % ring->buf_len;
+ return rval;
+ } else {
+ return -1;
+ }
+#endif
+}
+
+bool ringb_put(struct ringb *ring, uint8_t c) {
+#if 1
+ unsigned int next = (ring->idx_w + 1) % ring->buf_len;
+ if (next != ring->idx_r) {
+ ring->buf[ring->idx_w] = c;
+ ring->idx_w = next;
+ return true;
+ }
+ return false;
+#else
+ if (((ring->idx_w - ring->idx_r) % ring->buf_len) == 0) {
+ return false;
+ }
+ ring->buf[ring->idx_w] = c;
+ ring->idx_w = (ring->idx_w + 1) % ring->buf_len;
+ return true;
+#endif
+
+}
+
+
+void ringb_flush(struct ringb *ring) {
+ ring->idx_r = 0;
+ ring->idx_w = 0;
+}
+
+int ringb_depth(struct ringb *ring) {
+ return ((unsigned int)(ring->idx_w - ring->idx_r) % ring->buf_len);
+} \ No newline at end of file
diff --git a/usb-serial-rs485/ringb.h b/usb-serial-rs485/ringb.h
new file mode 100644
index 0000000..c3d5356
--- /dev/null
+++ b/usb-serial-rs485/ringb.h
@@ -0,0 +1,60 @@
+/*
+ * Karl Palsson <karlp@tweak.net.au>
+ * Considered to be released under your choice of:
+ * MIT/ISC/Apache2/BSD2Clause/GPLv2
+ * If you're looking for elegant compact performance you've come to the wrong
+ * place hombre.
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <stdint.h>
+
+struct ringb {
+ volatile unsigned int idx_r;
+ volatile unsigned int idx_w;
+ uint8_t *buf;
+ int buf_len;
+};
+
+/**
+ * Load up a ring buffer. Always suceeds
+ * @param ring struct saving state, provided by the user
+ * @param buf where the data will be kept
+ * @param len size of buf in in elements.
+ */
+void ringb_init(struct ringb *ring, uint8_t *buf, int len);
+
+/**
+ * push data in
+ * @param ring
+ * @param c
+ * @return true if space was available
+ */
+bool ringb_put(struct ringb *ring, uint8_t c);
+
+/**
+ * pull data out
+ * @param ring
+ * @return -1 for no data, uint8_t range for valid.
+ */
+int ringb_get(struct ringb *ring);
+
+/**
+ * Toss data and reset to empty
+ * @param ring
+ */
+void ringb_flush(struct ringb *ring);
+
+int ringb_depth(struct ringb *ring);
+
+
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/usb-serial-rs485/syscfg.h b/usb-serial-rs485/syscfg.h
new file mode 100644
index 0000000..d643af1
--- /dev/null
+++ b/usb-serial-rs485/syscfg.h
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SYSCFG_H
+#define SYSCFG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define STIMULUS_RING_DRAIN 2
+#define STIMULUS_RING_PUSH 3
+#define STIMULUS_TXC 4
+#define STIMULUS_TX 5
+
+#if defined STM32F1
+#define LED_RX_PORT GPIOC
+#define LED_RX_PIN GPIO13
+#define LED_TX_PORT GPIOC
+#define LED_TX_PIN GPIO13
+#define RS485DE_PORT GPIOA
+#define RS485DE_PIN GPIO8
+/* TODO: should really make a stm32f4discovery.h file... */
+#elif defined STM32F4
+
+#define LED_RX_PORT GPIOD
+#define LED_RX_PIN GPIO15 /* Blue, but you won't see this one much */
+#define LED_TX_PORT GPIOD
+#define LED_TX_PIN GPIO13 /* orange */
+/* On stm32f4 discovery, this is actually another led... */
+#define RS485DE_PORT GPIOD
+#define RS485DE_PIN GPIO14 /* red */
+
+#define STREAM_USART2_TX 6
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SYSCFG_H */
+
diff --git a/usb-serial-rs485/usb_cdcacm-arch.c b/usb-serial-rs485/usb_cdcacm-arch.c
new file mode 100644
index 0000000..e868861
--- /dev/null
+++ b/usb-serial-rs485/usb_cdcacm-arch.c
@@ -0,0 +1,82 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/dma.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/usart.h>
+
+#include "usb_cdcacm.h"
+#include "syscfg.h"
+#include "ringb.h"
+
+
+
+int glue_set_line_coding_cb(uint32_t baud, uint8_t databits,
+ enum usb_cdc_line_coding_bParityType cdc_parity,
+ enum usb_cdc_line_coding_bCharFormat cdc_stopbits)
+{
+ int uart_parity;
+ int uart_stopbits;
+
+ if (databits < 8 || databits > 9) {
+ return 0;
+ }
+
+ /* Be careful here, ST counts parity as a data bit */
+ switch (cdc_parity) {
+ case USB_CDC_NO_PARITY:
+ uart_parity = USART_PARITY_NONE;
+ break;
+ case USB_CDC_ODD_PARITY:
+ uart_parity = USART_PARITY_ODD;
+ databits++;
+ break;
+ case USB_CDC_EVEN_PARITY:
+ uart_parity = USART_PARITY_EVEN;
+ databits++;
+ break;
+ default:
+ return 0;
+ }
+
+ switch (cdc_stopbits) {
+ case USB_CDC_1_STOP_BITS:
+ uart_stopbits = USART_STOPBITS_1;
+ break;
+ case USB_CDC_2_STOP_BITS:
+ uart_stopbits = USART_STOPBITS_2;
+ break;
+ default:
+ return 0;
+ }
+
+ /* Disable the UART while we mess with its settings */
+ usart_disable(USART2);
+ /* Set communication parameters */
+ usart_set_baudrate(USART2, baud);
+ usart_set_databits(USART2, databits);
+ usart_set_parity(USART2, uart_parity);
+ usart_set_stopbits(USART2, uart_stopbits);
+ /* Back to work. */
+ usart_enable(USART2);
+
+ return 1;
+}
diff --git a/usb-serial-rs485/usb_cdcacm.c b/usb-serial-rs485/usb_cdcacm.c
new file mode 100644
index 0000000..099c4ad
--- /dev/null
+++ b/usb-serial-rs485/usb_cdcacm.c
@@ -0,0 +1,363 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * This package is _meant_ to be platform independent, just a full
+ * cdc-acm impl, with callbacks
+ */
+
+#include "usb_cdcacm.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <libopencm3/usb/usbd.h>
+#include <libopencm3/usb/cdc.h>
+#include <libopencm3/cm3/scb.h>
+// NOTHING ELSE! this file _does_ not know about part specifics!
+
+#include "syscfg.h"
+#include "ringb.h"
+
+#define ER_DEBUG
+#ifdef ER_DEBUG
+#define ER_DPRINTF(fmt, ...) \
+ do { printf(fmt, ## __VA_ARGS__); } while (0)
+#else
+#define ER_DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
+
+
+static uint8_t usbd_control_buffer[128];
+static usbd_device *acm_dev;
+
+static const struct usb_device_descriptor dev = {
+ .bLength = USB_DT_DEVICE_SIZE,
+ .bDescriptorType = USB_DT_DEVICE,
+ .bcdUSB = 0x2000,
+ .bDeviceClass = USB_CLASS_CDC,
+ .bDeviceSubClass = 0,
+ .bDeviceProtocol = 0,
+ .bMaxPacketSize0 = 64,
+ .idVendor = 0xc03e,
+ .idProduct = 0xb007,
+ .bcdDevice = 0x2000,
+ .iManufacturer = 1,
+ .iProduct = 2,
+ .iSerialNumber = 3,
+ .bNumConfigurations = 1,
+};
+
+/*
+ * This notification endpoint isn't implemented. According to CDC spec it's
+ * optional, but its absence causes a NULL pointer dereference in the
+ * Linux cdc_acm driver.
+ */
+static const struct usb_endpoint_descriptor comm_endp[] = {{
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0x83,
+ .bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
+ .wMaxPacketSize = 16,
+ .bInterval = 1,
+}};
+
+static const struct usb_endpoint_descriptor data_endp[] = {{
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0x01,
+ .bmAttributes = USB_ENDPOINT_ATTR_BULK,
+ .wMaxPacketSize = 64,
+ .bInterval = 1,
+}, {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0x82,
+ .bmAttributes = USB_ENDPOINT_ATTR_BULK,
+ .wMaxPacketSize = 64,
+ .bInterval = 1,
+}};
+
+static const struct {
+ struct usb_cdc_header_descriptor header;
+ struct usb_cdc_call_management_descriptor call_mgmt;
+ struct usb_cdc_acm_descriptor acm;
+ struct usb_cdc_union_descriptor cdc_union;
+} __attribute__ ((packed)) cdcacm_functional_descriptors = {
+ .header = {
+ .bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
+ .bDescriptorType = CS_INTERFACE,
+ .bDescriptorSubtype = USB_CDC_TYPE_HEADER,
+ .bcdCDC = 0x0110,
+ },
+ .call_mgmt = {
+ .bFunctionLength =
+ sizeof(struct usb_cdc_call_management_descriptor),
+ .bDescriptorType = CS_INTERFACE,
+ .bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
+ .bmCapabilities = 0,
+ .bDataInterface = 1,
+ },
+ .acm = {
+ .bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
+ .bDescriptorType = CS_INTERFACE,
+ .bDescriptorSubtype = USB_CDC_TYPE_ACM,
+ .bmCapabilities = (1 << 1),
+ },
+ .cdc_union = {
+ .bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
+ .bDescriptorType = CS_INTERFACE,
+ .bDescriptorSubtype = USB_CDC_TYPE_UNION,
+ .bControlInterface = 0,
+ .bSubordinateInterface0 = 1,
+ }
+};
+
+static const struct usb_interface_descriptor comm_iface[] = {{
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_CDC,
+ .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
+ .bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
+ .iInterface = 0,
+
+ .endpoint = comm_endp,
+
+ .extra = &cdcacm_functional_descriptors,
+ .extralen = sizeof(cdcacm_functional_descriptors)
+}};
+
+static const struct usb_interface_descriptor data_iface[] = {{
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 1,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_DATA,
+ .bInterfaceSubClass = 0,
+ .bInterfaceProtocol = 0,
+ .iInterface = 0,
+
+ .endpoint = data_endp,
+}};
+
+static const struct usb_interface ifaces[] = {{
+ .num_altsetting = 1,
+ .altsetting = comm_iface,
+}, {
+ .num_altsetting = 1,
+ .altsetting = data_iface,
+}};
+
+static const struct usb_config_descriptor config = {
+ .bLength = USB_DT_CONFIGURATION_SIZE,
+ .bDescriptorType = USB_DT_CONFIGURATION,
+ .wTotalLength = 0,
+ .bNumInterfaces = 2,
+ .bConfigurationValue = 1,
+ .iConfiguration = 0,
+ .bmAttributes = 0x80,
+ .bMaxPower = 0x32,
+
+ .interface = ifaces,
+};
+
+static char serial[] = "none";
+static const char *usb_strings[] = {
+ "libopencm3",
+ "usb_to_serial_cdcacm",
+ serial,
+ "DEMO",
+};
+
+struct ringb rx_ring;
+static uint8_t rx_ring_data[64];
+struct ringb tx_ring;
+static uint8_t tx_ring_data[128];
+bool nakked = false;
+
+
+static int cdcacm_control_request(usbd_device *usbd_dev,
+ struct usb_setup_data *req, uint8_t **buf,
+ uint16_t *len,
+ void (**complete) (usbd_device *usbd_dev,
+ struct usb_setup_data *
+ req))
+{
+ uint8_t dtr, rts;
+
+ (void) complete;
+ (void) buf;
+ (void) usbd_dev;
+
+ switch (req->bRequest) {
+ case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
+ {
+ /*
+ * This Linux cdc_acm driver requires this to be implemented
+ * even though it's optional in the CDC spec, and we don't
+ * advertise it in the ACM functional descriptor.
+ */
+
+ dtr = (req->wValue & (1 << 0)) ? 1 : 0;
+ rts = (req->wValue & (1 << 1)) ? 1 : 0;
+ ER_DPRINTF("CTRLRQ:%d Set Line state: dtr:%d rts: %d\n", req->wIndex, dtr, rts);
+
+ // FIXME - need to get port based on wIndex I believe?
+ cdcacm_arch_set_line_state(0, dtr, rts);
+
+ return 1;
+ }
+ case USB_CDC_REQ_SET_LINE_CODING:
+ {
+ struct usb_cdc_line_coding *coding;
+
+ if (*len < sizeof (struct usb_cdc_line_coding))
+ return 0;
+
+ coding = (struct usb_cdc_line_coding *) *buf;
+ ER_DPRINTF("CTRLRQ: line coding: %lu(%u:%u:%u)\n", coding->dwDTERate,
+ coding->bDataBits, coding->bParityType, coding->bCharFormat);
+ return glue_set_line_coding_cb(coding->dwDTERate,
+ coding->bDataBits,
+ coding->bParityType,
+ coding->bCharFormat);
+ }
+ }
+ return 0;
+}
+
+static void cdcacm_data_rx_cb(usbd_device *usbd_dev, uint8_t ep)
+{
+ uint8_t buf[64];
+ /* nak right now, we're not sure whether we'll be able to even process this!*/
+ usbd_ep_nak_set(usbd_dev, ep, 1);
+ int len = usbd_ep_read_packet(usbd_dev, ep, buf, 64);
+ ER_DPRINTF("Hrx%db\n", len);
+ cdcacm_arch_pin(0, CDCACM_PIN_LED_TX, 1);
+ cdcacm_arch_pin(0, CDCACM_PIN_RS485DE, 1);
+ for (int x = 0; x < len; x++) {
+ if (!ringb_put(&tx_ring, buf[x])) {
+ // failed to process usb traffic properly.
+ // should _never_ happen, means we failed to nak in time.
+ // this is _never_recoverable beyond watchdog reset.
+ while(1);
+ }
+ // look up port to suart mapping which side?
+ cdcacm_arch_txirq(0, 1);
+ }
+ if (ringb_depth(&tx_ring) < 64) {
+ ER_DPRINTF("ACK\n");
+ usbd_ep_nak_set(usbd_dev, ep, 0);
+ } else {
+ nakked = true;
+ }
+}
+
+static void cdcacm_set_config(usbd_device *usbd_dev, uint16_t wValue)
+{
+ (void) wValue;
+
+ usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64,
+ cdcacm_data_rx_cb);
+ usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
+ usbd_ep_setup(usbd_dev, 0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
+
+ usbd_register_control_callback(usbd_dev,
+ USB_REQ_TYPE_CLASS |
+ USB_REQ_TYPE_INTERFACE,
+ USB_REQ_TYPE_TYPE |
+ USB_REQ_TYPE_RECIPIENT,
+ cdcacm_control_request);
+}
+
+/* FIXME - need to report this! */
+void cdcacm_line_state_changed_cb(uint8_t linemask)
+{
+ const int size = sizeof (struct usb_cdc_notification) + 2;
+ uint8_t buf[size];
+
+ struct usb_cdc_notification *notify = (void *) buf;
+ notify->bmRequestType = 0xa1;
+ notify->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
+ notify->wValue = 0;
+ notify->wIndex = 1;
+ notify->wLength = 2;
+ uint16_t *data = (void *) &buf[sizeof (struct usb_cdc_notification)];
+ *data = linemask;
+
+ while (usbd_ep_write_packet(acm_dev, 0x83, buf, size) == size);
+}
+
+
+/* Y0, moron, nothing's stopping rx irqs from happening, have fun when you overflow temp buffer! */
+static void task_drain_rx(struct ringb *r) {
+ uint8_t zero_copy_is_for_losers[sizeof(rx_ring_data)];
+ int zci = 0;
+ int c = ringb_get(r);
+ while (c >= 0) {
+ //trace_send8(STIMULUS_RING_DRAIN, c);
+ zero_copy_is_for_losers[zci++] = c;
+ c = ringb_get(r);
+ }
+ if (zci) {
+ //trace_send16(STIMULUS_RING_DRAIN, zci);
+ ER_DPRINTF("Drx %db\n", zci);
+ usbd_ep_write_packet(acm_dev, 0x82, zero_copy_is_for_losers, zci);
+ }
+}
+
+
+usbd_device * usb_cdcacm_init(const usbd_driver *driver, const char *userserial)
+{
+ ringb_init(&rx_ring, rx_ring_data, sizeof(rx_ring_data));
+ ringb_init(&tx_ring, tx_ring_data, sizeof(tx_ring_data));
+ if (userserial) {
+ usb_strings[2] = userserial;
+ }
+
+ acm_dev = usbd_init(driver, &dev, &config, usb_strings, 4,
+ usbd_control_buffer, sizeof (usbd_control_buffer));
+ usbd_register_set_config_callback(acm_dev, cdcacm_set_config);
+ return acm_dev;
+}
+
+
+void usb_cdcacm_poll(usbd_device *usbd_dev) // FIXME -drop to acm_dev internal
+{
+ // Originally, calling this every 50 times caused some rx character droppage,
+ // and every 500 times caused _none_. _probably_ needs to be tied to
+ // a timer and something like the current baud rate and the inter character time
+ static int i = 0;
+ if (i++ > 500) {
+ // hacktastic
+ if (ringb_depth(&tx_ring) < 64 && nakked) {
+ usbd_ep_nak_set(usbd_dev, 1, 0);
+ nakked = false;
+ }
+
+ task_drain_rx(&rx_ring);
+ i = 0;
+ }
+
+
+} \ No newline at end of file
diff --git a/usb-serial-rs485/usb_cdcacm.h b/usb-serial-rs485/usb_cdcacm.h
new file mode 100644
index 0000000..d4e47e0
--- /dev/null
+++ b/usb-serial-rs485/usb_cdcacm.h
@@ -0,0 +1,74 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * This is the header file for a usb_cdcacm implmentation, usb_cdcacm.c is the
+ * platform independent portion, and usb_cdcacm-arch.c should be re-implemented
+ * for other platforms.
+ */
+
+#ifndef USB_CDCACM_H
+#define USB_CDCACM_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <libopencm3/usb/usbd.h>
+#include <libopencm3/usb/cdc.h>
+
+ enum cdcacm_pin {
+ CDCACM_PIN_NONE,
+ CDCACM_PIN_LED_TX,
+ CDCACM_PIN_LED_RX,
+ CDCACM_PIN_RS485DE,
+ };
+
+ usbd_device * usb_cdcacm_init(const usbd_driver *driver, const char *userserial);
+ void usb_cdcacm_setup_pre_arch(void);
+ void usb_cdcacm_setup_post_arch(usbd_device *dev);
+ void usb_cdcacm_poll(usbd_device *usbd_dev);
+ void cdcacm_line_state_changed_cb(uint8_t linemask);
+
+ /**
+ * Called by the cdcacm core to toggle pins as need be
+ * @param port which serial port, 0 normally
+ * @param pin logical pin
+ * @param set set or clear
+ */
+ void cdcacm_arch_pin(int port, enum cdcacm_pin pin, bool set);
+
+ /**
+ * enable the tx emmpty irq for the logical port
+ * @param port
+ * @param set
+ */
+ void cdcacm_arch_txirq(int port, bool set);
+
+ void cdcacm_arch_set_line_state(int port, uint8_t dtr, uint8_t rts);
+
+ int glue_set_line_coding_cb(uint32_t baud, uint8_t databits,
+ enum usb_cdc_line_coding_bParityType cdc_parity,
+ enum usb_cdc_line_coding_bCharFormat cdc_stopbits);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* USB_CDCACM_H */
+