diff options
Diffstat (limited to 'usb-serial-rs485/usb_cdcacm.c')
| -rw-r--r-- | usb-serial-rs485/usb_cdcacm.c | 363 |
1 files changed, 363 insertions, 0 deletions
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; + } + + +}
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