diff --git a/cores/esp32/HardwareSerial.cpp b/cores/esp32/HardwareSerial.cpp index 3cbcf264fcc..313d0f784ef 100644 --- a/cores/esp32/HardwareSerial.cpp +++ b/cores/esp32/HardwareSerial.cpp @@ -6,6 +6,7 @@ #include "pins_arduino.h" #include "HardwareSerial.h" #include "soc/soc_caps.h" +#include "driver/uart.h" #ifndef SOC_RX0 #if CONFIG_IDF_TARGET_ESP32 @@ -114,7 +115,6 @@ void serialEventRun(void) } #endif - HardwareSerial::HardwareSerial(int uart_nr) : _uart_nr(uart_nr), _uart(NULL), _rxBufferSize(256) {} void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin, bool invert, unsigned long timeout_ms, uint8_t rxfifo_full_thrhd) @@ -123,28 +123,39 @@ void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, in log_e("Serial number is invalid, please use numers from 0 to %u", SOC_UART_NUM - 1); return; } + + // First Time or after end() --> set default Pins + if (!uartIsDriverInstalled(_uart)) { + switch (_uart_nr) { + case UART_NUM_0: + rxPin = rxPin < 0 ? SOC_RX0 : rxPin; + txPin = txPin < 0 ? SOC_TX0 : txPin; + break; +#if SOC_UART_NUM > 1 // may save some flash bytes... + case UART_NUM_1: + rxPin = rxPin < 0 ? RX1 : rxPin; + txPin = txPin < 0 ? TX1 : txPin; + break; +#endif +#if SOC_UART_NUM > 2 // may save some flash bytes... + case UART_NUM_2: + rxPin = rxPin < 0 ? RX2 : rxPin; + txPin = txPin < 0 ? TX2 : txPin; + break; +#endif + default: + log_e("Bad UART Number"); + return; + } + } + if(_uart) { // in this case it is a begin() over a previous begin() - maybe to change baud rate // thus do not disable debug output end(false); } - if(_uart_nr == 0 && rxPin < 0 && txPin < 0) { - rxPin = SOC_RX0; - txPin = SOC_TX0; - } -#if SOC_UART_NUM > 1 - if(_uart_nr == 1 && rxPin < 0 && txPin < 0) { - rxPin = RX1; - txPin = TX1; - } -#endif -#if SOC_UART_NUM > 2 - if(_uart_nr == 2 && rxPin < 0 && txPin < 0) { - rxPin = RX2; - txPin = TX2; - } -#endif + // IDF UART driver keeps Pin setting on restarting. Negative Pin number will keep it unmodified. _uart = uartBegin(_uart_nr, baud ? baud : 9600, config, rxPin, txPin, _rxBufferSize, invert, rxfifo_full_thrhd); if (!baud) { // using baud rate as zero, forces it to try to detect the current baud rate in place @@ -280,9 +291,16 @@ void HardwareSerial::setRxInvert(bool invert) uartSetRxInvert(_uart, invert); } -void HardwareSerial::setPins(uint8_t rxPin, uint8_t txPin) +// negative Pin value will keep it unmodified +void HardwareSerial::setPins(int8_t rxPin, int8_t txPin, int8_t ctsPin, int8_t rtsPin) +{ + uartSetPins(_uart, rxPin, txPin, ctsPin, rtsPin); +} + +// Enables or disables Hardware Flow Control using RTS and/or CTS pins (must use setAllPins() before) +void HardwareSerial::setHwFlowCtrlMode(uint8_t mode, uint8_t threshold) { - uartSetPins(_uart, rxPin, txPin); + uartSetHwFlowCtrlMode(_uart, mode, threshold); } size_t HardwareSerial::setRxBufferSize(size_t new_size) { diff --git a/cores/esp32/HardwareSerial.h b/cores/esp32/HardwareSerial.h index 796412c8ce3..b1e21bc6b27 100644 --- a/cores/esp32/HardwareSerial.h +++ b/cores/esp32/HardwareSerial.h @@ -107,7 +107,13 @@ class HardwareSerial: public Stream void setDebugOutput(bool); void setRxInvert(bool); - void setPins(uint8_t rxPin, uint8_t txPin); + + // Negative Pin Number will keep it unmodified, thus this function can set individual pins + // SetPins shall be called after Serial begin() + void setPins(int8_t rxPin, int8_t txPin, int8_t ctsPin = -1, int8_t rtsPin = -1); + // Enables or disables Hardware Flow Control using RTS and/or CTS pins (must use setAllPins() before) + void setHwFlowCtrlMode(uint8_t mode = HW_FLOWCTRL_CTS_RTS, uint8_t threshold = 64); // 64 is half FIFO Length + size_t setRxBufferSize(size_t new_size); protected: diff --git a/cores/esp32/esp32-hal-uart.c b/cores/esp32/esp32-hal-uart.c index 84992e7f05d..157c3640830 100644 --- a/cores/esp32/esp32-hal-uart.c +++ b/cores/esp32/esp32-hal-uart.c @@ -155,15 +155,27 @@ bool uartIsDriverInstalled(uart_t* uart) return false; } -void uartSetPins(uart_t* uart, uint8_t rxPin, uint8_t txPin) +// Valid pin UART_PIN_NO_CHANGE is defined to (-1) +// Negative Pin Number will keep it unmodified, thus this function can set individual pins +void uartSetPins(uart_t* uart, int8_t rxPin, int8_t txPin, int8_t ctsPin, int8_t rtsPin) { - if(uart == NULL || rxPin >= SOC_GPIO_PIN_COUNT || txPin >= SOC_GPIO_PIN_COUNT) { + if(uart == NULL) { return; } UART_MUTEX_LOCK(); - ESP_ERROR_CHECK(uart_set_pin(uart->num, txPin, rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE)); - UART_MUTEX_UNLOCK(); - + // IDF uart_set_pin() will issue necessary Error Message and take care of all GPIO Number validation. + uart_set_pin(uart->num, txPin, rxPin, ctsPin, rtsPin); + UART_MUTEX_UNLOCK(); +} + +// +void uartSetHwFlowCtrlMode(uart_t *uart, uint8_t mode, uint8_t threshold) { + if(uart == NULL) { + return; + } + // IDF will issue corresponding error message when mode or threshold are wrong and prevent crashing + // IDF will check (mode > HW_FLOWCTRL_CTS_RTS || threshold >= SOC_UART_FIFO_LEN) + uart_set_hw_flow_ctrl(uart->num, (uart_hw_flowcontrol_t) mode, threshold); } @@ -173,10 +185,6 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx return NULL; } - if(rxPin == -1 && txPin == -1) { - return NULL; - } - uart_t* uart = &_uart_bus_array[uart_nr]; if (uart_is_driver_installed(uart_nr)) { diff --git a/cores/esp32/esp32-hal-uart.h b/cores/esp32/esp32-hal-uart.h index ff790bf6691..22a3a74c86a 100644 --- a/cores/esp32/esp32-hal-uart.h +++ b/cores/esp32/esp32-hal-uart.h @@ -48,6 +48,14 @@ extern "C" { #define SERIAL_7O2 0x800003b #define SERIAL_8O2 0x800003f +// These are Hardware Flow Contol possible usage +// equivalent to UDF enum uart_hw_flowcontrol_t from +// https://github.com/espressif/esp-idf/blob/master/components/hal/include/hal/uart_types.h#L75-L81 +#define HW_FLOWCTRL_DISABLE 0x0 // disable HW Flow Control +#define HW_FLOWCTRL_RTS 0x1 // use only RTS PIN for HW Flow Control +#define HW_FLOWCTRL_CTS 0x2 // use only CTS PIN for HW Flow Control +#define HW_FLOWCTRL_CTS_RTS 0x3 // use both CTS and RTS PIN for HW Flow Control + struct uart_struct_t; typedef struct uart_struct_t uart_t; @@ -76,7 +84,12 @@ void uartSetDebug(uart_t* uart); int uartGetDebug(); bool uartIsDriverInstalled(uart_t* uart); -void uartSetPins(uart_t* uart, uint8_t rxPin, uint8_t txPin); + +// Negative Pin Number will keep it unmodified, thus this function can set individual pins +void uartSetPins(uart_t* uart, int8_t rxPin, int8_t txPin, int8_t ctsPin, int8_t rtsPin); + +// Enables or disables HW Flow Control function -- needs also to set CTS and/or RTS pins +void uartSetHwFlowCtrlMode(uart_t *uart, uint8_t mode, uint8_t threshold); void uartStartDetectBaudrate(uart_t *uart); unsigned long uartDetectBaudrate(uart_t *uart);