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arduino-esp32-custom-lwip-p.../cores/esp32/USBCDC.cpp

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// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "USB.h"
#if CONFIG_TINYUSB_CDC_ENABLED
#include "USBCDC.h"
#include "esp32-hal-tinyusb.h"
ESP_EVENT_DEFINE_BASE(ARDUINO_USB_CDC_EVENTS);
esp_err_t arduino_usb_event_post(esp_event_base_t event_base, int32_t event_id, void *event_data, size_t event_data_size, TickType_t ticks_to_wait);
esp_err_t arduino_usb_event_handler_register_with(esp_event_base_t event_base, int32_t event_id, esp_event_handler_t event_handler, void *event_handler_arg);
#define MAX_USB_CDC_DEVICES 2
USBCDC * devices[MAX_USB_CDC_DEVICES] = {NULL, NULL};
static uint16_t load_cdc_descriptor(uint8_t * dst, uint8_t * itf)
{
uint8_t str_index = tinyusb_add_string_descriptor("TinyUSB CDC");
uint8_t descriptor[TUD_CDC_DESC_LEN] = {
// Interface number, string index, EP notification address and size, EP data address (out, in) and size.
TUD_CDC_DESCRIPTOR(*itf, str_index, 0x85, 64, 0x03, 0x84, 64)
};
*itf+=2;
memcpy(dst, descriptor, TUD_CDC_DESC_LEN);
return TUD_CDC_DESC_LEN;
}
// Invoked when line state DTR & RTS are changed via SET_CONTROL_LINE_STATE
void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
{
if(itf < MAX_USB_CDC_DEVICES && devices[itf] != NULL){
devices[itf]->_onLineState(dtr, rts);
}
}
// Invoked when line coding is change via SET_LINE_CODING
void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* p_line_coding)
{
if(itf < MAX_USB_CDC_DEVICES && devices[itf] != NULL){
devices[itf]->_onLineCoding(p_line_coding->bit_rate, p_line_coding->stop_bits, p_line_coding->parity, p_line_coding->data_bits);
}
}
// Invoked when received new data
void tud_cdc_rx_cb(uint8_t itf)
{
if(itf < MAX_USB_CDC_DEVICES && devices[itf] != NULL){
devices[itf]->_onRX();
}
}
// Invoked when received send break
void tud_cdc_send_break_cb(uint8_t itf, uint16_t duration_ms){
//log_v("itf: %u, duration_ms: %u", itf, duration_ms);
}
// Invoked when space becomes available in TX buffer
void tud_cdc_tx_complete_cb(uint8_t itf){
if(itf < MAX_USB_CDC_DEVICES && devices[itf] != NULL){
devices[itf]->_onTX();
}
}
static void ARDUINO_ISR_ATTR cdc0_write_char(char c){
if(devices[0] != NULL){
devices[0]->write(c);
}
}
static void usb_unplugged_cb(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data){
((USBCDC*)arg)->_onUnplugged();
}
USBCDC::USBCDC(uint8_t itfn)
: itf(itfn)
, bit_rate(0)
, stop_bits(0)
, parity(0)
, data_bits(0)
, dtr(false)
, rts(false)
, connected(false)
, reboot_enable(true)
, rx_queue(NULL)
, tx_lock(NULL)
, tx_timeout_ms(250)
{
tinyusb_enable_interface(USB_INTERFACE_CDC, TUD_CDC_DESC_LEN, load_cdc_descriptor);
if(itf < MAX_USB_CDC_DEVICES){
arduino_usb_event_handler_register_with(ARDUINO_USB_EVENTS, ARDUINO_USB_STOPPED_EVENT, usb_unplugged_cb, this);
}
}
USBCDC::~USBCDC(){
end();
}
void USBCDC::onEvent(esp_event_handler_t callback){
onEvent(ARDUINO_USB_CDC_ANY_EVENT, callback);
}
void USBCDC::onEvent(arduino_usb_cdc_event_t event, esp_event_handler_t callback){
arduino_usb_event_handler_register_with(ARDUINO_USB_CDC_EVENTS, event, callback, this);
}
size_t USBCDC::setRxBufferSize(size_t rx_queue_len){
size_t currentQueueSize = rx_queue ?
uxQueueSpacesAvailable(rx_queue) + uxQueueMessagesWaiting(rx_queue) : 0;
if (rx_queue_len != currentQueueSize) {
xQueueHandle new_rx_queue = NULL;
if (rx_queue_len) {
new_rx_queue = xQueueCreate(rx_queue_len, sizeof(uint8_t));
if(!new_rx_queue){
log_e("CDC Queue creation failed.");
return 0;
}
if (rx_queue) {
size_t copySize = uxQueueMessagesWaiting(rx_queue);
if (copySize > 0) {
for(size_t i = 0; i < copySize; i++) {
uint8_t ch = 0;
xQueueReceive(rx_queue, &ch, 0);
if (!xQueueSend(new_rx_queue, &ch, 0)) {
arduino_usb_cdc_event_data_t p;
p.rx_overflow.dropped_bytes = copySize - i;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_RX_OVERFLOW_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
log_e("CDC RX Overflow.");
break;
}
}
}
vQueueDelete(rx_queue);
}
rx_queue = new_rx_queue;
return rx_queue_len;
} else {
if (rx_queue) {
vQueueDelete(rx_queue);
rx_queue = NULL;
}
}
}
return rx_queue_len;
}
void USBCDC::begin(unsigned long baud)
{
if(tx_lock == NULL) {
tx_lock = xSemaphoreCreateMutex();
}
// if rx_queue was set before begin(), keep it
if (!rx_queue) setRxBufferSize(256); //default if not preset
devices[itf] = this;
}
void USBCDC::end()
{
connected = false;
devices[itf] = NULL;
setRxBufferSize(0);
if(tx_lock != NULL) {
vSemaphoreDelete(tx_lock);
tx_lock = NULL;
}
}
void USBCDC::setTxTimeoutMs(uint32_t timeout){
tx_timeout_ms = timeout;
}
void USBCDC::_onUnplugged(void){
if(connected){
connected = false;
dtr = false;
rts = false;
arduino_usb_cdc_event_data_t p;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_DISCONNECTED_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
}
}
enum { CDC_LINE_IDLE, CDC_LINE_1, CDC_LINE_2, CDC_LINE_3 };
void USBCDC::_onLineState(bool _dtr, bool _rts){
static uint8_t lineState = CDC_LINE_IDLE;
if(dtr == _dtr && rts == _rts){
return; // Skip duplicate events
}
dtr = _dtr;
rts = _rts;
if(reboot_enable){
if(!dtr && rts){
if(lineState == CDC_LINE_IDLE){
lineState++;
if(connected){
connected = false;
arduino_usb_cdc_event_data_t p;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_DISCONNECTED_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
}
} else {
lineState = CDC_LINE_IDLE;
}
} else if(dtr && rts){
if(lineState == CDC_LINE_1){
lineState++;
} else {
lineState = CDC_LINE_IDLE;
}
} else if(dtr && !rts){
if(lineState == CDC_LINE_2){
lineState++;
} else {
lineState = CDC_LINE_IDLE;
}
} else if(!dtr && !rts){
if(lineState == CDC_LINE_3){
usb_persist_restart(RESTART_BOOTLOADER);
} else {
lineState = CDC_LINE_IDLE;
}
}
}
if(lineState == CDC_LINE_IDLE){
if(dtr && rts && !connected){
connected = true;
arduino_usb_cdc_event_data_t p;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_CONNECTED_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
} else if(!dtr && connected){
connected = false;
arduino_usb_cdc_event_data_t p;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_DISCONNECTED_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
}
arduino_usb_cdc_event_data_t l;
l.line_state.dtr = dtr;
l.line_state.rts = rts;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_LINE_STATE_EVENT, &l, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
}
}
void USBCDC::_onLineCoding(uint32_t _bit_rate, uint8_t _stop_bits, uint8_t _parity, uint8_t _data_bits){
if(bit_rate != _bit_rate || data_bits != _data_bits || stop_bits != _stop_bits || parity != _parity){
// ArduinoIDE sends LineCoding with 1200bps baud to reset the device
if(reboot_enable && _bit_rate == 1200){
usb_persist_restart(RESTART_BOOTLOADER);
} else {
bit_rate = _bit_rate;
data_bits = _data_bits;
stop_bits = _stop_bits;
parity = _parity;
arduino_usb_cdc_event_data_t p;
p.line_coding.bit_rate = bit_rate;
p.line_coding.data_bits = data_bits;
p.line_coding.stop_bits = stop_bits;
p.line_coding.parity = parity;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_LINE_CODING_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
}
}
}
void USBCDC::_onRX(){
arduino_usb_cdc_event_data_t p;
uint8_t buf[CONFIG_TINYUSB_CDC_RX_BUFSIZE+1];
uint32_t count = tud_cdc_n_read(itf, buf, CONFIG_TINYUSB_CDC_RX_BUFSIZE);
for(uint32_t i=0; i<count; i++){
if(rx_queue == NULL || !xQueueSend(rx_queue, buf+i, 10)) {
p.rx_overflow.dropped_bytes = count - i;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_RX_OVERFLOW_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
log_e("CDC RX Overflow.");
count = i;
break;
}
}
if (count) {
p.rx.len = count;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_RX_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
}
}
void USBCDC::_onTX(){
arduino_usb_cdc_event_data_t p;
arduino_usb_event_post(ARDUINO_USB_CDC_EVENTS, ARDUINO_USB_CDC_TX_EVENT, &p, sizeof(arduino_usb_cdc_event_data_t), portMAX_DELAY);
}
void USBCDC::enableReboot(bool enable){
reboot_enable = enable;
}
bool USBCDC::rebootEnabled(void){
return reboot_enable;
}
int USBCDC::available(void)
{
if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
return -1;
}
return uxQueueMessagesWaiting(rx_queue);
}
int USBCDC::peek(void)
{
if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
return -1;
}
uint8_t c;
if(xQueuePeek(rx_queue, &c, 0)) {
return c;
}
return -1;
}
int USBCDC::read(void)
{
if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
return -1;
}
uint8_t c = 0;
if(xQueueReceive(rx_queue, &c, 0)) {
return c;
}
return -1;
}
size_t USBCDC::read(uint8_t *buffer, size_t size)
{
if(itf >= MAX_USB_CDC_DEVICES || rx_queue == NULL){
return -1;
}
uint8_t c = 0;
size_t count = 0;
while(count < size && xQueueReceive(rx_queue, &c, 0)){
buffer[count++] = c;
}
return count;
}
void USBCDC::flush(void)
{
if(itf >= MAX_USB_CDC_DEVICES || tx_lock == NULL || !tud_cdc_n_connected(itf)){
return;
}
if(xSemaphoreTake(tx_lock, tx_timeout_ms / portTICK_PERIOD_MS) != pdPASS){
return;
}
tud_cdc_n_write_flush(itf);
xSemaphoreGive(tx_lock);
}
int USBCDC::availableForWrite(void)
{
if(itf >= MAX_USB_CDC_DEVICES || tx_lock == NULL || !tud_cdc_n_connected(itf)){
return 0;
}
if(xSemaphoreTake(tx_lock, tx_timeout_ms / portTICK_PERIOD_MS) != pdPASS){
return 0;
}
size_t a = tud_cdc_n_write_available(itf);
xSemaphoreGive(tx_lock);
return a;
}
size_t USBCDC::write(const uint8_t *buffer, size_t size)
{
if(itf >= MAX_USB_CDC_DEVICES || tx_lock == NULL || buffer == NULL || size == 0 || !tud_cdc_n_connected(itf)){
return 0;
}
if(xPortInIsrContext()){
BaseType_t taskWoken = false;
if(xSemaphoreTakeFromISR(tx_lock, &taskWoken) != pdPASS){
return 0;
}
} else if(xSemaphoreTake(tx_lock, tx_timeout_ms / portTICK_PERIOD_MS) != pdPASS){
return 0;
}
size_t to_send = size, so_far = 0;
while(to_send){
if(!tud_cdc_n_connected(itf)){
size = so_far;
break;
}
size_t space = tud_cdc_n_write_available(itf);
if(!space){
tud_cdc_n_write_flush(itf);
continue;
}
if(space > to_send){
space = to_send;
}
size_t sent = tud_cdc_n_write(itf, buffer+so_far, space);
if(sent){
so_far += sent;
to_send -= sent;
tud_cdc_n_write_flush(itf);
} else {
size = so_far;
break;
}
}
if(xPortInIsrContext()){
BaseType_t taskWoken = false;
xSemaphoreGiveFromISR(tx_lock, &taskWoken);
} else {
xSemaphoreGive(tx_lock);
}
return size;
}
size_t USBCDC::write(uint8_t c)
{
return write(&c, 1);
}
uint32_t USBCDC::baudRate()
{
return bit_rate;
}
void USBCDC::setDebugOutput(bool en)
{
if(en) {
uartSetDebug(NULL);
ets_install_putc1((void (*)(char)) &cdc0_write_char);
} else {
ets_install_putc1(NULL);
}
}
USBCDC::operator bool() const
{
if(itf >= MAX_USB_CDC_DEVICES){
return false;
}
return connected;
}
#if ARDUINO_USB_CDC_ON_BOOT && !ARDUINO_USB_MODE //Serial used for USB CDC
USBCDC Serial(0);
#endif
#endif /* CONFIG_TINYUSB_CDC_ENABLED */
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