Adds UART RX IRQ Callback with onReceive() (espressif#6134)

* Adds UART RX IRQ Callback with onReceive()

Author: SuGlider

cores/esp32/HardwareSerial.cpp

@@ -159,6 +159,11 @@ void HardwareSerial::begin(unsigned long baud, uint32_t config, int8_t rxPin, in
     }
 }
 
+void HardwareSerial::onReceive(void(*function)(void))
+{
+    uartOnReceive(_uart, function);
+}
+
 void HardwareSerial::updateBaudRate(unsigned long baud)
 {
 	uartSetBaudRate(_uart, baud);

cores/esp32/HardwareSerial.h

@@ -57,6 +57,10 @@ class HardwareSerial: public Stream
 public:
     HardwareSerial(int uart_nr);
 
+    // onReceive will setup a callback for whenever UART data is received
+    // it will work as UART Rx interrupt 
+    void onReceive(void(*function)(void));
+
     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, uint8_t rxfifo_full_thrhd = 112);
     void end(bool turnOffDebug = true);
     void updateBaudRate(unsigned long baud);

cores/esp32/esp32-hal-uart.c

@@ -34,7 +34,9 @@ struct uart_struct_t {
     uint8_t num;
     bool has_peek;
     uint8_t peek_byte;
-
+    QueueHandle_t uart_event_queue;
+    void (*onReceive)(void);
+    TaskHandle_t envent_task;
 };
 
 #if CONFIG_DISABLE_HAL_LOCKS
@@ -43,12 +45,12 @@ struct uart_struct_t {
 #define UART_MUTEX_UNLOCK()
 
 static uart_t _uart_bus_array[] = {
-    {0, false, 0},
+    {0, false, 0, NULL, NULL, NULL},
 #if SOC_UART_NUM > 1
-    {1, false, 0},
+    {1, false, 0, NULL, NULL, NULL},
 #endif
 #if SOC_UART_NUM > 2
-    {2, false, 0},
+    {2, false, 0, NULL, NULL, NULL},
 #endif
 };
 
@@ -58,12 +60,12 @@ static uart_t _uart_bus_array[] = {
 #define UART_MUTEX_UNLOCK()  xSemaphoreGive(uart->lock)
 
 static uart_t _uart_bus_array[] = {
-    {NULL, 0, false, 0},
+    {NULL, 0, false, 0, NULL, NULL, NULL},
 #if SOC_UART_NUM > 1
-    {NULL, 1, false, 0},
+    {NULL, 1, false, 0, NULL, NULL, NULL},
 #endif
 #if SOC_UART_NUM > 2
-    {NULL, 2, false, 0},
+    {NULL, 2, false, 0, NULL, NULL, NULL},
 #endif
 };
 
@@ -82,6 +84,67 @@ uint32_t _get_effective_baudrate(uint32_t baudrate)
     }
 }
 
+
+void uartOnReceive(uart_t* uart, void(*function)(void))
+{
+    if(uart == NULL || function == NULL) {
+        return;
+    }
+    UART_MUTEX_LOCK();
+    uart->onReceive = function;
+    UART_MUTEX_UNLOCK();
+}
+
+
+static void uart_event_task(void *args)
+{
+    uart_t* uart = (uart_t *)args;
+    uart_event_t event;
+    for(;;) {
+        //Waiting for UART event.
+        if(xQueueReceive(uart->uart_event_queue, (void * )&event, (portTickType)portMAX_DELAY)) {
+            switch(event.type) {
+                //Event of UART receving data
+                case UART_DATA:
+                    UART_MUTEX_LOCK();
+                    if(uart->onReceive) uart->onReceive();
+                    UART_MUTEX_UNLOCK();
+                    break;
+                //Event of HW FIFO overflow detected
+                case UART_FIFO_OVF:
+                    log_w("UART%d FIFO Overflow. Flushing data. Consider adding Flow Control to your Application.", uart->num);
+                    uart_flush_input(uart->num);
+                    xQueueReset(uart->uart_event_queue);
+                    break;
+                //Event of UART ring buffer full
+                case UART_BUFFER_FULL:
+                    log_w("UART%d Buffer Full. Flushing data. Consider encreasing your buffer size of your Application.", uart->num);
+                    uart_flush_input(uart->num);
+                    xQueueReset(uart->uart_event_queue);
+                    break;
+                //Event of UART RX break detected
+                case UART_BREAK:
+                    log_w("UART%d RX break.", uart->num);
+                    break;
+                //Event of UART parity check error
+                case UART_PARITY_ERR:
+                    log_w("UART%d parity error.", uart->num);
+                    break;
+                //Event of UART frame error
+                case UART_FRAME_ERR:
+                    log_w("UART%d frame error.", uart->num);
+                    break;
+                //Others
+                default:
+                    log_w("UART%d unknown event type %d.", uart->num, event.type);
+                    break;
+            }
+        }
+    }
+    vTaskDelete(NULL);
+}
+
+
 bool uartIsDriverInstalled(uart_t* uart) 
 {
     if(uart == NULL) {
@@ -143,7 +206,7 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx
     uart_config.source_clk = UART_SCLK_APB;
 
 
-    ESP_ERROR_CHECK(uart_driver_install(uart_nr, 2*queueLen, 0, 0, NULL, 0));
+    ESP_ERROR_CHECK(uart_driver_install(uart_nr, 2*queueLen, 0, 20, &(uart->uart_event_queue), 0));
     ESP_ERROR_CHECK(uart_param_config(uart_nr, &uart_config));
     ESP_ERROR_CHECK(uart_set_pin(uart_nr, txPin, rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));
 
@@ -153,6 +216,12 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx
         ESP_ERROR_CHECK(uart_set_line_inverse(uart_nr, UART_SIGNAL_TXD_INV | UART_SIGNAL_RXD_INV));    
     }
 
+    // Creating UART event Task
+    xTaskCreate(uart_event_task, "uart_event_task", 2048, uart, configMAX_PRIORITIES - 1, &(uart->envent_task));
+    if (!uart->envent_task) {
+        log_e(" -- UART%d Event Task not Created!", uart_nr);
+    }
+
     UART_MUTEX_UNLOCK();
 
     uartFlush(uart);
@@ -167,6 +236,11 @@ void uartEnd(uart_t* uart)
 
     UART_MUTEX_LOCK();
     uart_driver_delete(uart->num);
+    if (uart->envent_task) {
+        vTaskDelete(uart->envent_task);
+        uart->envent_task = NULL;
+        uart->onReceive = NULL;
+    }
     UART_MUTEX_UNLOCK();
 }
 

cores/esp32/esp32-hal-uart.h

@@ -54,6 +54,8 @@ typedef struct uart_struct_t uart_t;
 uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rxPin, int8_t txPin, uint16_t queueLen, bool inverted, uint8_t rxfifo_full_thrhd);
 void uartEnd(uart_t* uart);
 
+void uartOnReceive(uart_t* uart, void(*function)(void));
+
 uint32_t uartAvailable(uart_t* uart);
 uint32_t uartAvailableForWrite(uart_t* uart);
 uint8_t uartRead(uart_t* uart);