Added baudrate detection to esp32-hal-uart and HardwareSerial (#1961)
* Added baudrate detection to esp32-hal-uart and HardwareSerial * Solved compiler warning for uartResizeRxBuffer() * Add unit to header variable name (timeout_ms) * Reverting accidentally changed files to master * Add small delay after baudrate detection
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@ -30,7 +30,7 @@ HardwareSerial Serial2(2);
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HardwareSerial::HardwareSerial(int uart_nr) : _uart_nr(uart_nr), _uart(NULL) {}
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void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin, bool invert)
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void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin, bool invert, unsigned long timeout_ms)
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{
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if(0 > _uart_nr || _uart_nr > 2) {
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log_e("Serial number is invalid, please use 0, 1 or 2");
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@ -51,7 +51,26 @@ void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, in
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rxPin = RX2;
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txPin = TX2;
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}
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_uart = uartBegin(_uart_nr, baud, config, rxPin, txPin, 256, invert);
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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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time_t startMillis = millis();
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unsigned long detectedBaudRate;
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while(millis() - startMillis < timeout_ms && !(detectedBaudRate = uartDetectBaudrate(_uart))) {
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yield();
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}
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end();
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if(detectedBaudRate) {
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delay(100); // Give some time...
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_uart = uartBegin(_uart_nr, detectedBaudRate, config, rxPin, txPin, 256, invert);
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} else {
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log_e("Could not detect baudrate. Serial data at the port must be present within the timeout for detection to be possible");
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_uart = NULL;
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}
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}
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}
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void HardwareSerial::end()
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@ -22,6 +22,24 @@
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Modified 18 December 2014 by Ivan Grokhotkov (esp8266 platform support)
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Modified 31 March 2015 by Markus Sattler (rewrite the code for UART0 + UART1 support in ESP8266)
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Modified 25 April 2015 by Thomas Flayols (add configuration different from 8N1 in ESP8266)
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Modified 13 October 2018 by Jeroen Döll (add baudrate detection)
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Baudrate detection example usage (detection on Serial1):
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void setup() {
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Serial.begin(115200);
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delay(100);
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Serial.println();
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Serial1.begin(0, SERIAL_8N1, -1, -1, true, 11000UL); // Passing 0 for baudrate to detect it, the last parameter is a timeout in ms
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unsigned long detectedBaudRate = Serial1.baudRate();
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if(detectedBaudRate) {
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Serial.printf("Detected baudrate is %lu\n", detectedBaudRate);
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} else {
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Serial.println("No baudrate detected, Serial1 will not work!");
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}
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}
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Pay attention: the baudrate returned by baudRate() may be rounded, eg 115200 returns 115201
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*/
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#ifndef HardwareSerial_h
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@ -37,7 +55,7 @@ class HardwareSerial: public Stream
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public:
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HardwareSerial(int uart_nr);
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void begin(unsigned long baud, uint32_t config=SERIAL_8N1, int8_t rxPin=-1, int8_t txPin=-1, bool invert=false);
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void begin(unsigned long baud, uint32_t config=SERIAL_8N1, int8_t rxPin=-1, int8_t txPin=-1, bool invert=false, unsigned long timeout_ms = 20000UL);
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void end();
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int available(void);
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int availableForWrite(void);
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@ -242,7 +242,7 @@ void uartEnd(uart_t* uart)
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size_t uartResizeRxBuffer(uart_t * uart, size_t new_size) {
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if(uart == NULL) {
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return;
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return 0;
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}
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UART_MUTEX_LOCK();
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@ -455,3 +455,65 @@ int log_printf(const char *format, ...)
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}
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return len;
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}
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/*
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* if enough pulses are detected return the minimum high pulse duration + minimum low pulse duration divided by two.
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* This equals one bit period. If flag is true the function return inmediately, otherwise it waits for enough pulses.
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*/
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unsigned long uartBaudrateDetect(uart_t *uart, bool flg)
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{
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while(uart->dev->rxd_cnt.edge_cnt < 30) { // UART_PULSE_NUM(uart_num)
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if(flg) return 0;
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ets_delay_us(1000);
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}
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UART_MUTEX_LOCK();
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unsigned long ret = ((uart->dev->lowpulse.min_cnt + uart->dev->highpulse.min_cnt) >> 1) + 12;
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UART_MUTEX_UNLOCK();
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return ret;
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}
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/*
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* To start detection of baud rate with the uart the auto_baud.en bit needs to be cleared and set. The bit period is
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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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unsigned long
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uartDetectBaudrate(uart_t *uart)
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{
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static bool uartStateDetectingBaudrate = false;
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if(!uartStateDetectingBaudrate) {
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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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uartStateDetectingBaudrate = true;
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}
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unsigned long divisor = uartBaudrateDetect(uart, true);
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if (!divisor) {
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return 0;
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}
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uart->dev->auto_baud.en = 0;
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uartStateDetectingBaudrate = false; // Initialize for the next round
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unsigned long baudrate = UART_CLK_FREQ / divisor;
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static const unsigned long default_rates[] = {300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 74880, 115200, 230400, 256000, 460800, 921600, 1843200, 3686400};
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size_t i;
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for (i = 1; i < sizeof(default_rates) / sizeof(default_rates[0]) - 1; i++) // find the nearest real baudrate
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{
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if (baudrate <= default_rates[i])
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{
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if (baudrate - default_rates[i - 1] < default_rates[i] - baudrate) {
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i--;
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}
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break;
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}
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}
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return default_rates[i];
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}
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@ -72,6 +72,8 @@ 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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unsigned long uartDetectBaudrate(uart_t *uart);
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#ifdef __cplusplus
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}
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#endif
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