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cdc_uart: start AutoBaud on magic baud and set detected baud rate

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This commit is contained in:
martamomotko
2025-11-10 12:58:50 +00:00
parent d8543b2143
commit 73b65009df
1 changed files with 30 additions and 12 deletions
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42
src/cdc_uart.c
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@@ -27,6 +27,7 @@
#include "FreeRTOS.h"
#include "task.h"
#include "tusb.h"
#include "autobaud.h"
#include "probe_config.h"
@@ -50,6 +51,8 @@ static volatile uint tx_led_debounce;
static uint rx_led_debounce;
#endif
static BaudInfo_t baud_info;
void cdc_uart_init(void) {
gpio_set_function(PROBE_UART_TX, GPIO_FUNC_UART);
gpio_set_function(PROBE_UART_RX, GPIO_FUNC_UART);
@@ -176,6 +179,22 @@ bool cdc_task(void)
return keep_alive;
}
void cdc_uart_set_baudrate(uint32_t baudrate) {
/* Set the tick thread interval to the amount of time it takes to
* fill up half a FIFO. Millis is too coarse for integer divide.
*/
uint32_t micros = (1000 * 1000 * 16 * 10) / MAX(baudrate, 1);
interval = MAX(1, micros / ((1000 * 1000) / configTICK_RATE_HZ));
debounce_ticks = MAX(1, configTICK_RATE_HZ / (interval * DEBOUNCE_MS));
probe_info("New baud rate %ld micros %ld interval %lu\n",
baudrate, micros, interval);
uart_deinit(PROBE_UART_INTERFACE);
tud_cdc_write_clear();
tud_cdc_read_flush();
uart_init(PROBE_UART_INTERFACE, baudrate);
}
void cdc_thread(void *ptr)
{
BaseType_t delayed;
@@ -202,23 +221,22 @@ void cdc_thread(void *ptr)
void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* line_coding)
{
if (line_coding->bit_rate == MAGIC_BAUD) {
if (!autobaud_running)
autobaud_start();
return;
}
else if (autobaud_running) {
autobaud_wait_stop();
}
uart_parity_t parity;
uint data_bits, stop_bits;
/* Set the tick thread interval to the amount of time it takes to
* fill up half a FIFO. Millis is too coarse for integer divide.
*/
uint32_t micros = (1000 * 1000 * 16 * 10) / MAX(line_coding->bit_rate, 1);
/* Modifying state, so park the thread before changing it. */
if (tud_cdc_connected())
vTaskSuspend(uart_taskhandle);
interval = MAX(1, micros / ((1000 * 1000) / configTICK_RATE_HZ));
debounce_ticks = MAX(1, configTICK_RATE_HZ / (interval * DEBOUNCE_MS));
probe_info("New baud rate %ld micros %ld interval %lu\n",
line_coding->bit_rate, micros, interval);
uart_deinit(PROBE_UART_INTERFACE);
tud_cdc_write_clear();
tud_cdc_read_flush();
uart_init(PROBE_UART_INTERFACE, line_coding->bit_rate);
cdc_uart_set_baudrate(line_coding->bit_rate);
switch (line_coding->parity) {
case CDC_LINE_CODING_PARITY_ODD: