make TimedRead and TimedPeek virtual, added new Hardare Serial HAL abstractions

Author: imwhocodes

Diff for: cores/esp32/HardwareSerial.cpp

@@ -527,15 +527,16 @@ int HardwareSerial::peek(void) {
   return -1;
 }
 
-int HardwareSerial::read(void) {
+int HardwareSerial::_read(uint32_t timeout) {
   uint8_t c = 0;
-  if (uartReadBytes(_uart, &c, 1, 0) == 1) {
+  if (uartReadBytes(_uart, &c, 1, timeout) == 1) {
     return c;
   } else {
     return -1;
   }
 }
 
+
 // read characters into buffer
 // terminates if size characters have been read, or no further are pending
 // returns the number of characters placed in the buffer
@@ -662,3 +663,13 @@ size_t HardwareSerial::setTxBufferSize(size_t new_size) {
   _txBufferSize = new_size;
   return new_size;
 }
+
+int HardwareSerial::timedPeek(void) {
+
+  uint8_t out;
+  if(uartTimedPeek(_uart, &out, _timeout)){
+    return out;
+  }
+
+  return -1;
+}

Diff for: cores/esp32/HardwareSerial.h

@@ -311,7 +311,9 @@ class HardwareSerial : public Stream {
   int available(void);
   int availableForWrite(void);
   int peek(void);
-  int read(void);
+  int read(void){
+    return _read(0);
+  }
   size_t read(uint8_t *buffer, size_t size);
   inline size_t read(char *buffer, size_t size) {
     return read((uint8_t *)buffer, size);
@@ -399,6 +401,14 @@ class HardwareSerial : public Stream {
   void _createEventTask(void *args);
   void _destroyEventTask(void);
   static void _uartEventTask(void *args);
+
+  int _read(uint32_t timeout);
+
+  virtual int timedRead() override {
+    return _read(_timeout);
+  }
+
+  virtual int timedPeek() override;
 };
 
 extern void serialEventRun(void) __attribute__((weak));

Diff for: cores/esp32/Stream.h

@@ -49,8 +49,8 @@ class Stream : public Print {
 protected:
   unsigned long _timeout;                                          // number of milliseconds to wait for the next char before aborting timed read
   unsigned long _startMillis;                                      // used for timeout measurement
-  int timedRead();                                                 // private method to read stream with timeout
-  int timedPeek();                                                 // private method to peek stream with timeout
+  virtual int timedRead();                                         // private method to read stream with timeout
+  virtual int timedPeek();                                         // private method to peek stream with timeout
   int peekNextDigit(LookaheadMode lookahead, bool detectDecimal);  // returns the next numeric digit in the stream or -1 if timeout
 
 public:

Diff for: cores/esp32/esp32-hal-uart.c

@@ -952,6 +952,34 @@ uint8_t uartPeek(uart_t *uart) {
   return c;
 }
 
+bool uartTimedPeek(uart_t *uart, uint8_t * out, uint32_t timeout_ms) {
+  if (uart == NULL || out == NULL) {
+    return false;
+  }
+
+  bool valid = false;
+
+  UART_MUTEX_LOCK();
+
+  if (uart->has_peek) {
+    *out = uart->peek_byte;
+    valid = true;
+  } else {
+    uint8_t c = 0;
+    int len = uart_read_bytes(uart->num, &c, 1, pdMS_TO_TICKS(timeout_ms));
+    if (len > 0) {
+      uart->has_peek = true;
+      uart->peek_byte = c;
+      *out = c;
+      valid = true;
+    }
+  }
+
+  UART_MUTEX_UNLOCK();
+
+  return valid;
+}
+
 void uartWrite(uart_t *uart, uint8_t c) {
   if (uart == NULL) {
     return;

Diff for: cores/esp32/esp32-hal-uart.h

@@ -51,6 +51,7 @@ uint32_t uartAvailableForWrite(uart_t *uart);
 size_t uartReadBytes(uart_t *uart, uint8_t *buffer, size_t size, uint32_t timeout_ms);
 uint8_t uartRead(uart_t *uart);
 uint8_t uartPeek(uart_t *uart);
+bool uartTimedPeek(uart_t *uart, uint8_t * out, uint32_t timeout_ms);
 
 void uartWrite(uart_t *uart, uint8_t c);
 void uartWriteBuf(uart_t *uart, const uint8_t *data, size_t len);