HardwareSerial: use correct UART HW for TX

cores/arduino/HardwareSerial.cpp

@@ -170,14 +170,17 @@ int HardwareSerial::read(void)
 size_t HardwareSerial::write(const uint8_t *buffer, size_t size)
 {
 
-    return  uart_debug_write((uint8_t *)buffer, size);
+    for (size_t i = 0; i < size; i++) {
+      write(buffer[i]);
+    }
+
+    return len;
 }
 
 
 size_t HardwareSerial::write(uint8_t c)
 {
-  uint8_t buff = c;
-  return write(&buff, 1);
+  return uart_putc(&_serial, c);
 }
 
 void HardwareSerial::setRx(uint32_t _rx)

cores/arduino/ch32/uart.c

@@ -528,6 +528,30 @@ int uart_getc(serial_t *obj, unsigned char *c)
   return 0;
 }
 
+/**
+  * @brief  Write byte to uart
+  * @param  obj : pointer to serial_t structure
+  * @retval error status
+  */
+int uart_putc(serial_t *obj, unsigned char c)
+{
+  uint32_t tickstart = GetTick();
+
+  if (obj == NULL) {
+    return -1;
+  }
+
+  while (serial_tx_active(obj))
+  {
+    if ((GetTick() - tickstart) >= TX_TIMEOUT)
+    {
+      return 0;
+    }
+  }
+
+  return USART_SendData(uart_handlers[obj->index]->Instance, c);
+
+}
 
 
 

cores/arduino/ch32/uart.h

@@ -90,6 +90,7 @@ typedef struct __UART_HandleTypeDef
   void uart_deinit(serial_t *obj);
 
   int uart_getc(serial_t *obj, unsigned char *c);
+  int uart_putc(serial_t *obj, unsigned char c);
 
   uint8_t serial_tx_active(serial_t *obj);
   uint8_t serial_rx_active(serial_t *obj);