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authorKarl Palsson <karlp@tweak.net.au>2016-09-26 22:04:02 +0000
committerKarl Palsson <karlp@tweak.net.au>2016-09-26 22:04:02 +0000
commitc0ec94e4c94371d22c334396c5d937d0a682de78 (patch)
tree8fbf2576d64ebc3cb708b08c63e5863fe2c220d2 /tests/usb-serial-rs485
parent19d3225fd66573a2a62ece83158cd5551255f2ad (diff)
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ubs-serial-rs485: First solidly working version.
Needs major refactoring to split out the _actual_ arch dependent pieces. Needs parity and more complete baud rate support. Needs rs485 support.
Diffstat (limited to 'tests/usb-serial-rs485')
-rw-r--r--tests/usb-serial-rs485/Makefile.stm32f4-disco38
-rw-r--r--tests/usb-serial-rs485/README21
-rw-r--r--tests/usb-serial-rs485/main-stm32f4-disco.c169
-rw-r--r--tests/usb-serial-rs485/ringb.c59
-rw-r--r--tests/usb-serial-rs485/ringb.h60
-rw-r--r--tests/usb-serial-rs485/syscfg.h50
-rw-r--r--tests/usb-serial-rs485/usb_cdcacm-arch.c124
-rw-r--r--tests/usb-serial-rs485/usb_cdcacm.c310
-rw-r--r--tests/usb-serial-rs485/usb_cdcacm.h56
9 files changed, 887 insertions, 0 deletions
diff --git a/tests/usb-serial-rs485/Makefile.stm32f4-disco b/tests/usb-serial-rs485/Makefile.stm32f4-disco
new file mode 100644
index 0000000..1c60091
--- /dev/null
+++ b/tests/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/tests/usb-serial-rs485/README b/tests/usb-serial-rs485/README
new file mode 100644
index 0000000..e3d4948
--- /dev/null
+++ b/tests/usb-serial-rs485/README
@@ -0,0 +1,21 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+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.
+
diff --git a/tests/usb-serial-rs485/main-stm32f4-disco.c b/tests/usb-serial-rs485/main-stm32f4-disco.c
new file mode 100644
index 0000000..f024e46
--- /dev/null
+++ b/tests/usb-serial-rs485/main-stm32f4-disco.c
@@ -0,0 +1,169 @@
+/*
+ * 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 usbd_device *usbd_dev;
+static 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 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)
+{
+ // 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);
+ }
+ 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
+ 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_interrupt_source(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);
+// }
+}
+
+/* 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) {
+ zero_copy_is_for_losers[zci++] = c;
+ c = ringb_get(r);
+ }
+ if (zci) {
+ trace_send16(STIMULUS_RING_DRAIN, zci);
+ glue_data_received_cb(zero_copy_is_for_losers, zci);
+ }
+
+}
+
+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);
+
+ usart_setup();
+ ringb_init(&rx_ring, rx_ring_data, sizeof(rx_ring_data));
+ ringb_init(&tx_ring, tx_ring_data, sizeof(tx_ring_data));
+
+ usb_cdcacm_init(&usbd_dev);
+
+ ER_DPRINTF("Looping...\n");
+ volatile int i = 0;
+ while (1) {
+ usbd_poll(usbd_dev);
+ 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;
+ }
+
+ }
+
+}
+
diff --git a/tests/usb-serial-rs485/ringb.c b/tests/usb-serial-rs485/ringb.c
new file mode 100644
index 0000000..245325b
--- /dev/null
+++ b/tests/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/tests/usb-serial-rs485/ringb.h b/tests/usb-serial-rs485/ringb.h
new file mode 100644
index 0000000..c3d5356
--- /dev/null
+++ b/tests/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/tests/usb-serial-rs485/syscfg.h b/tests/usb-serial-rs485/syscfg.h
new file mode 100644
index 0000000..7e2a6d8
--- /dev/null
+++ b/tests/usb-serial-rs485/syscfg.h
@@ -0,0 +1,50 @@
+/*
+ * 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
+
+/* TODO: should really make a stm32f4discovery.h file... */
+
+#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
+
+#define STIMULUS_RING_DRAIN 2
+#define STIMULUS_RING_PUSH 3
+#define STIMULUS_TXC 4
+#define STIMULUS_TX 5
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SYSCFG_H */
+
diff --git a/tests/usb-serial-rs485/usb_cdcacm-arch.c b/tests/usb-serial-rs485/usb_cdcacm-arch.c
new file mode 100644
index 0000000..8680906
--- /dev/null
+++ b/tests/usb-serial-rs485/usb_cdcacm-arch.c
@@ -0,0 +1,124 @@
+/*
+ * 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"
+
+extern bool out_in_progress;
+
+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(void)
+{
+}
+
+// hacktastic
+extern struct ringb tx_ring;
+void glue_send_data_cb(uint8_t *buf, uint16_t len)
+{
+ if (len == 0) {
+ return;
+ }
+ gpio_set(LED_TX_PORT, LED_TX_PIN);
+ gpio_set(RS485DE_PORT, RS485DE_PIN);
+ 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);
+ }
+ usart_enable_tx_interrupt(USART2);
+ }
+}
+
+void glue_set_line_state_cb(uint8_t dtr, uint8_t rts)
+{
+ (void) dtr;
+ (void) rts;
+ // LM4f has an implementation of this if you're keen
+}
+
+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/tests/usb-serial-rs485/usb_cdcacm.c b/tests/usb-serial-rs485/usb_cdcacm.c
new file mode 100644
index 0000000..8617d2b
--- /dev/null
+++ b/tests/usb-serial-rs485/usb_cdcacm.c
@@ -0,0 +1,310 @@
+/*
+ * 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>
+
+#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
+
+
+uint8_t usbd_control_buffer[128];
+usbd_device *acm_dev;
+
+bool out_in_progress;
+
+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 const char *usb_strings[] = {
+ "libopencm3",
+ "usb_to_serial_cdcacm",
+ "none",
+ "DEMO",
+};
+
+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: Set Line state: dtr:%d rts: %d\n", dtr, rts);
+
+ glue_set_line_state_cb(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;
+}
+
+extern bool nakked;
+extern struct ringb tx_ring;
+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);
+ // push all of what we got into our outbound fifo
+ glue_send_data_cb(buf, len);
+ 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);
+}
+
+void glue_data_received_cb(uint8_t *buf, uint16_t len)
+{
+ ER_DPRINTF("Drx %db\n", len);
+ usbd_ep_write_packet(acm_dev, 0x82, buf, len);
+}
+
+void usb_cdcacm_init(usbd_device **usbd_dev)
+{
+ usb_cdcacm_setup_pre_arch();
+
+ *usbd_dev = usbd_init(&otgfs_usb_driver, &dev, &config, usb_strings, 4,
+ usbd_control_buffer, sizeof (usbd_control_buffer));
+ acm_dev = *usbd_dev;
+ usbd_register_set_config_callback(acm_dev, cdcacm_set_config);
+
+ usb_cdcacm_setup_post_arch();
+}
diff --git a/tests/usb-serial-rs485/usb_cdcacm.h b/tests/usb-serial-rs485/usb_cdcacm.h
new file mode 100644
index 0000000..3228d0a
--- /dev/null
+++ b/tests/usb-serial-rs485/usb_cdcacm.h
@@ -0,0 +1,56 @@
+/*
+ * 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>
+
+ void usb_cdcacm_init(usbd_device **usb_dev);
+ void usb_cdcacm_setup_pre_arch(void);
+ void usb_cdcacm_setup_post_arch(void);
+ void cdcacm_send_data(uint8_t *buf, uint16_t len);
+ void cdcacm_line_state_changed_cb(uint8_t linemask);
+
+ /* Call this if you have data to send to the usb host */
+ void glue_data_received_cb(uint8_t *buf, uint16_t len);
+ /* These will be called by usb_cdcacm code */
+ void glue_send_data_cb(uint8_t *buf, uint16_t len);
+
+ void glue_set_line_state_cb(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 */
+