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@ -12,8 +12,11 @@ |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* |
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*/ |
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/* Copyright (c) 2016 King Kévin <kingkevin@cuvoodoo.info> */ |
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/* this library handles the USB CDC ACM */ |
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/** @brief library for USB CDC ACM communication (code)
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* @file usb_cdcacm.c |
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* @author King Kévin <kingkevin@cuvoodoo.info> |
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* @date 2016 |
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*/ |
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/* standard libraries */ |
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#include <stdint.h> // standard integer types |
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@ -31,8 +34,8 @@ |
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#include "usb_cdcacm.h" // USB CDC ACM header and definitions |
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/* USB devices descriptor
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* as defined in USB CDC specification section 5 |
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/** @brief USB CDC ACM device descriptor
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* @note as defined in USB CDC specification section 5 |
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*/ |
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static const struct usb_device_descriptor device_descriptor = { |
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.bLength = USB_DT_DEVICE_SIZE, // the size of this header in bytes, 18
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@ -51,6 +54,9 @@ static const struct usb_device_descriptor device_descriptor = { |
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.bNumConfigurations = 1, // the number of possible configurations this device has
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}; |
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/** @brief USB CDC ACM data endpoints
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* @note as defined in USB CDC specification section 5 |
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*/ |
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static const struct usb_endpoint_descriptor data_endpoints[] = {{ |
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.bLength = USB_DT_ENDPOINT_SIZE, // the size of the endpoint descriptor in bytes
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.bDescriptorType = USB_DT_ENDPOINT, // a value of 5 indicates that this describes an endpoint
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@ -67,9 +73,8 @@ static const struct usb_endpoint_descriptor data_endpoints[] = {{ |
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.bInterval = 1, // the frequency, in number of frames, that we're going to be sending data
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}}; |
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/* This notification endpoint isn't implemented. According to CDC spec its
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* optional, but its absence causes a NULL pointer dereference in Linux |
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* cdc_acm driver. |
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/** @brief USB CDC ACM communication endpoints
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* @note This notification endpoint isn't implemented. According to CDC spec its optional, but its absence causes a NULL pointer dereference in Linux cdc_acm driver |
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*/ |
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static const struct usb_endpoint_descriptor communication_endpoints[] = {{ |
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.bLength = USB_DT_ENDPOINT_SIZE, // the size of the endpoint descriptor in bytes
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@ -80,8 +85,8 @@ static const struct usb_endpoint_descriptor communication_endpoints[] = {{ |
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.bInterval = 255, // the frequency, in number of frames, that we're going to be sending data
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}}; |
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/* functional descriptor
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* as defined in USB CDC specification section 5.2.3 |
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/** @brief USB CDC ACM functional descriptor
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* @note as defined in USB CDC specification section 5.2.3 |
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*/ |
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static const struct { |
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struct usb_cdc_header_descriptor header; |
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@ -117,8 +122,8 @@ static const struct { |
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}, |
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}; |
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/* communication class interface descriptor
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* as defined in USB CDC specification section 5.1.3 |
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/** @brief USB CDC interface descriptor
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* @note as defined in USB CDC specification section 5.1.3 |
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*/ |
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static const struct usb_interface_descriptor communication_interface[] = {{ |
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.bLength = USB_DT_INTERFACE_SIZE, |
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@ -137,8 +142,8 @@ static const struct usb_interface_descriptor communication_interface[] = {{ |
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.extralen = sizeof(cdcacm_functional_descriptors), |
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}}; |
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/* data class interface descriptor
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* as defined in USB CDC specification section 5.1.3 |
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/** @brief USB CDC ACM data class interface descriptor
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* @note as defined in USB CDC specification section 5.1.3 |
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*/ |
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static const struct usb_interface_descriptor data_interface[] = {{ |
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.bLength = USB_DT_INTERFACE_SIZE, |
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@ -154,6 +159,7 @@ static const struct usb_interface_descriptor data_interface[] = {{ |
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.endpoint = data_endpoints, |
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}}; |
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/** @brief USB CDC ACM interface descriptor */ |
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static const struct usb_interface interfaces[] = {{ |
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.num_altsetting = 1, |
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.altsetting = communication_interface, |
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@ -162,6 +168,7 @@ static const struct usb_interface interfaces[] = {{ |
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.altsetting = data_interface, |
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}}; |
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/** @brief USB CDC ACM configuration descriptor */ |
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static const struct usb_config_descriptor config = { |
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.bLength = USB_DT_CONFIGURATION_SIZE, // the length of this header in bytes
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.bDescriptorType = USB_DT_CONFIGURATION, // a value of 2 indicates that this is a configuration descriptor
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@ -175,17 +182,19 @@ static const struct usb_config_descriptor config = { |
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.interface = interfaces, // pointer to an array of interfaces
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}; |
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/* string table (starting with index 1) */ |
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const char *usb_strings[] = { |
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/** @brief USB string table
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* @note starting with index 1 |
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*/ |
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static const char *usb_strings[] = { |
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"CuVoodoo", |
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"CDC-ACM", |
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"STM32F1", |
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}; |
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/* buffer to be used for control requests */ |
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/** buffer to be used for control requests */ |
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static uint8_t usbd_control_buffer[128]; |
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/* structure holding all the info related to the USB device */ |
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/** structure holding all the info related to the USB device */ |
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static usbd_device *usb_device; |
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/* input and output ring buffer, indexes, and available memory */ |
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@ -195,10 +204,9 @@ static volatile uint8_t rx_used = 0; |
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static uint8_t tx_buffer[CDCACM_BUFFER] = {0}; |
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static volatile uint8_t tx_i = 0; |
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static volatile uint8_t tx_used = 0; |
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/* show the user how much data received over USB is ready */ |
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volatile uint8_t cdcacm_received = 0; // same as rx_used, but since the user can write this variable we don't rely on it
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/* disconnect USB by pulling down D+ to for re-enumerate */ |
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/** @brief disconnect USB by pulling down D+ to for re-enumerate */ |
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static void usb_disconnect(void) |
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{ |
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/* short USB disconnect to force re-enumerate */ |
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@ -222,6 +230,9 @@ static void usb_disconnect(void) |
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#endif |
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} |
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/** @brief incoming USB CDC ACM control request
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* @note resets device when configured with 5 bits |
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*/ |
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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)) |
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{ |
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(void)complete; |
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@ -338,7 +349,6 @@ void cdcacm_setup(void) |
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usbd_ep_write_packet(usb_device, 0x82, NULL, 0); |
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} |
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/* get character from USB CDC ACM (blocking) */ |
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char cdcacm_getchar(void) |
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{ |
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while (!rx_used) { // idle until data is available
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@ -351,7 +361,6 @@ char cdcacm_getchar(void) |
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return to_return; |
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} |
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/* put character on USB CDC ACM (blocking) */ |
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void cdcacm_putchar(char c) |
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{ |
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if (tx_used<sizeof(tx_buffer)) { // buffer not full
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@ -364,10 +373,12 @@ void cdcacm_putchar(char c) |
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usbd_ep_write_packet(usb_device, 0x82, NULL, 0); // trigger tx (not sure why cdcacm_data_tx_cb doesn't work else)
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} |
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/** @brief USB interrupt service routine called on wake-up event */ |
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void usb_wakeup_isr(void) { |
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usbd_poll(usb_device); |
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} |
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/** @brief USB interrupt service routine called when data is received */ |
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void usb_lp_can_rx0_isr(void) { |
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usbd_poll(usb_device); |
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} |
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