Bugfix/detect baudrate (#3188)
* Expose uartStartDetectBaudrate(uart_t *) in esp32-hal-uart.h and call it from HardwareSerial::begin() if baudrate detection is requested (by passing a baudrate of 0) to solve baudrate detection problems * Avoid a division by zero error in uartGetBaudRate()
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@ -55,6 +55,7 @@ void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, in
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_uart = uartBegin(_uart_nr, baud ? baud : 9600, config, rxPin, txPin, 256, invert);
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if(!baud) {
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uartStartDetectBaudrate(_uart);
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time_t startMillis = millis();
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unsigned long detectedBaudRate = 0;
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while(millis() - startMillis < timeout_ms && !(detectedBaudRate = uartDetectBaudrate(_uart))) {
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@ -401,7 +401,12 @@ uint32_t uartGetBaudRate(uart_t* uart)
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if(uart == NULL) {
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return 0;
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}
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uint32_t clk_div = (uart->dev->clk_div.div_int << 4) | (uart->dev->clk_div.div_frag & 0x0F);
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if(!clk_div) {
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return 0;
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}
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return ((getApbFrequency()<<4)/clk_div);
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}
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@ -522,6 +527,14 @@ unsigned long uartBaudrateDetect(uart_t *uart, bool flg)
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* detected calling uartBadrateDetect(). The raw baudrate is computed using the UART_CLK_FREQ. The raw baudrate is
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* rounded to the closed real baudrate.
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*/
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void uartStartDetectBaudrate(uart_t *uart) {
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if(!uart) return;
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uart->dev->auto_baud.glitch_filt = 0x08;
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uart->dev->auto_baud.en = 0;
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uart->dev->auto_baud.en = 1;
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}
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unsigned long
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uartDetectBaudrate(uart_t *uart)
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{
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@ -72,6 +72,7 @@ size_t uartResizeRxBuffer(uart_t* uart, size_t new_size);
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void uartSetDebug(uart_t* uart);
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int uartGetDebug();
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void uartStartDetectBaudrate(uart_t *uart);
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unsigned long uartDetectBaudrate(uart_t *uart);
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bool uartRxActive(uart_t* uart);
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