From 843105da52e15761303232f595cd37116936a549 Mon Sep 17 00:00:00 2001
From: AceVest <zhaoyanbai@126.com>
Date: Fri, 7 Jun 2019 21:31:13 +0800
Subject: [PATCH] =?utf8?q?usart1=20usart2=20=E4=B9=8B=E9=97=B4=E9=87=8D?=
 =?utf8?q?=E5=AE=9A=E5=90=91?=
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---
 learn/stm32/USART.md | 76 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 75 insertions(+), 1 deletion(-)

diff --git a/learn/stm32/USART.md b/learn/stm32/USART.md
index 080af4f..12076be 100644
--- a/learn/stm32/USART.md
+++ b/learn/stm32/USART.md
@@ -25,4 +25,78 @@ PUTCHAR_PROTOTYPE
 
 `Mode: Asynchronous`
 
-`Hadware Flow Control (RS233): Disable`
\ No newline at end of file
+`Hadware Flow Control (RS233): Disable`
+
+
+
+# USART1、USART2转发
+
+需要开启这两个串口的中断
+
+```
+#define USART_RX_BUFSZ	10
+typedef struct {
+	uint8_t rxdata;
+	uint8_t rxbuf[USART_RX_BUFSZ];
+	uint16_t rxwp;
+	uint16_t rxrp;
+} UsartData_t;
+
+UsartData_t usart1_data;
+UsartData_t usart2_data;
+
+
+void InitUsartTransfer(){
+	usart1_data.rxrp = usart1_data.rxwp = 0;
+	usart2_data.rxrp = usart2_data.rxwp = 0;
+	if(HAL_OK != HAL_UART_Receive_IT(&huart1, &usart1_data.rxdata, 1)) {
+		Error_Handler();
+	}
+
+	if(HAL_OK != HAL_UART_Receive_IT(&huart2, &usart2_data.rxdata, 1)) {
+		Error_Handler();
+	}
+}
+
+void TransferToUsart(UsartData_t *data, UART_HandleTypeDef *to_huart){
+	uint16_t rxwp = data->rxwp;
+	if(data->rxrp == rxwp) {
+		// empty
+		return ;
+	}
+	HAL_UART_Transmit(to_huart, data->rxbuf+data->rxrp, 1, 0xFFFF);
+	data->rxrp = (data->rxrp + 1) % USART_RX_BUFSZ;
+}
+
+void TransferUsartData() {
+	TransferToUsart(&usart1_data, &huart2);
+	TransferToUsart(&usart2_data, &huart1);
+}
+
+void ReceiveUsartData(UsartData_t *data, UART_HandleTypeDef *huart) {
+	if((data->rxwp + 1) % USART_RX_BUFSZ == data->rxrp) {
+		// full
+		goto end;
+	}
+
+	data->rxbuf[data->rxwp] = data->rxdata;
+
+	data->rxwp =(data->rxwp + 1) % USART_RX_BUFSZ;
+
+end:
+	if(HAL_OK != HAL_UART_Receive_IT(huart, &data->rxdata, 1)) {
+		//Error_Handler();
+	}
+}
+
+
+void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
+	if(huart->Instance == USART1) {
+		return ReceiveUsartData(&usart1_data, huart);
+	}
+
+	if(huart->Instance == USART2) {
+		return ReceiveUsartData(&usart2_data, huart);
+	}
+}
+```
\ No newline at end of file
-- 
2.44.0