add new usart

+#ifndef _RINGBUF_H_
+#define _RINGBUF_H_
+
+#include "cmsis_os.h"
+
+#if !defined(__WINDOWS__) && !defined (FREERTOS) && !defined (LINUX)
+#define FREERTOS
+#endif
+
+/**
+ * Put data in a specific length.
+ * @param *buffer	 the position of buffer specified by user.
+ * @param len	 the length of data which user wants to put.
+ * @return WRITE_SUCCEED if write succeed,FAIL_LACK_OF_SPACE if no enough space to write in.
+ */
+int8_t RINGBUF_SEND(const char * buffer, uint16_t len);
+
+/**
+ * Take data out in a specific length.
+ * @param *buffer	 the position of buffer specified by user.
+ * @param len	 the length of data which user wants to take.
+ * @return RINGBUF_READ if read succeed,FAIL_READ_TOO_FAST if readpoint would pass writepoint.
+ */
+int8_t RINGBUF_READ(uint8_t * buffer, uint16_t len);
+
+/**
+ * Get data from a specific length.
+ * @param *buffer	 the position of buffer specified by user.
+ * @param len	 the length of data which user wants to get,not take out!!
+ * @return RINGBUF_READ if read succeed,FAIL_READ_TOO_FAST if readpoint would pass writepoint.
+ */
+int8_t RINGBUF_PEEK(uint8_t * buffer, uint16_t len);
+
+/**
+ * use buffer specified by user as ringbuffer.
+ * @param *buffer	 the position of buffer specified by user.
+ * @param len	 the length of buffer which user wants.
+ * @return NULL.
+ */
+void RINGBUF_INIT(uint8_t * ringbuffer, uint16_t len);
+
+/**
+ * check if read too fast.
+ * @param NULL
+ * @return 1 if read gradually,0 if readpoint catch writepoint.
+ */
+uint8_t RINGBUF_CHECKIO(void);
+
+/**
+ * request for space avaliable to write.
+ * @param NULL
+ * @return len the space avaliable to use of this ringbuffer.
+ */
+uint16_t RINGBUF_AVALIABLE_SPACE(void);
+	
+#endif

@@ -28,21 +28,19 @@
 
 /* USER CODE BEGIN Includes */
 #include <mprintf.h>
+#include "ringbuffer.h"
 /* USER CODE END Includes */
 
 extern UART_HandleTypeDef huart1;
 extern UART_HandleTypeDef huart2;
 
 /* USER CODE BEGIN Private defines */
-#define USART_REC_LEN       200
+#define USART1_BUF_LEN       200
 
-extern uint8_t  USART_RX_BUF[USART_REC_LEN]; // 接收缓冲，最大USART_REC_LEN个字节，末字节为换行
-extern uint16_t USART_RX_STA;
+extern uint8_t USART1_RingBuff[USART1_BUF_LEN]; // 接收缓冲
 
-#define RXBUFFERSIZE   1 // 缓存大小
-extern uint8_t aRxBuffer[RXBUFFERSIZE]; // HAL库USART接收Buffer
-
-#define DEBUG_PRINT(str, len) HAL_UART_Transmit(&huart1, (uint8_t*)str, len, 1000);
+#define AT_RESP(str, len) HAL_UART_Transmit(&huart2, (uint8_t*)str, len, 1000)
+#define DEBUG_PRINT(str, len) HAL_UART_Transmit(&huart1, (uint8_t*)str, len, 1000)
 /* USER CODE END Private defines */
 
 void MX_USART1_UART_Init(void);

@@ -260,34 +260,24 @@ DONE:
 void StartUartTask(void *argument)
 {
   /* USER CODE BEGIN StartUartTask */
-  uint8_t len;
+  uint8_t temp;
   uint16_t times;
   /* Infinite loop */
   for(;;)
   {
-    if (USART_RX_STA & 0x8000)
+    while(RINGBUF_CHECKIO())
+		{
+			RINGBUF_READ(&temp, 1);
+      mprintf("%c", temp);
+		}
+
+    times++;
+    if (times % 5000 == 0)
     {
-      len = USART_RX_STA & 0x3fff; // 获取接收到的数据长度
-      mprintf("\r\nReceived:\r\n");
-      HAL_UART_Transmit(&huart1, (uint8_t*)USART_RX_BUF, len, 1000);
-      while (__HAL_UART_GET_FLAG(&huart1, UART_FLAG_TC) != SET);
-      mprintf("\r\n\r\n");
-      USART_RX_STA=0;
-    }
-    else
-    {
-      times++;
-      if (times % 5000 == 0)
-      {
-        mprintf("\r\nUART Test\r\n");
-      }
-//      if (times % 1000 == 0)
-//      {
-//        mprintf("print char\r\n");
-//      }
+      mprintf("\r\nUART Test\r\n");
     }
 
-    osDelay(1);
+    osDelay(5);
   }
   /* USER CODE END StartUartTask */
 }

@@ -98,8 +98,9 @@ int main(void)
   /* USER CODE BEGIN 2 */
   // 使能TIM3中断
   HAL_TIM_Base_Start_IT(&htim3);
-  // 使能UART2中断
-  HAL_UART_Receive_IT(&huart2, (uint8_t*)aRxBuffer, RXBUFFERSIZE);
+  // 使能RingBuf和UART2中断
+  RINGBUF_INIT(USART1_RingBuff, USART1_BUF_LEN);
+  __HAL_UART_ENABLE_IT(&huart2, UART_IT_RXNE);
   /* USER CODE END 2 */
 
   /* Call init function for freertos objects (in freertos.c) */

+#include "ringbuffer.h"
+#include "string.h"
+
+#ifdef FREERTOS
+#include "FreeRTOS.h"
+#include "task.h"
+#include "queue.h"
+#include "timers.h"
+#include "semphr.h"
+#include "portmacro.h"
+
+xSemaphoreHandle xSemaphore_RINGBUF = NULL;
+#endif
+
+#define WRITE_SUCCEED 0
+#define READ_SUCCESS 0
+
+#define FAIL_LACK_OF_SPACE -1
+#define FAIL_READ_TOO_FAST -2
+
+static uint16_t WRITE_ID;
+static uint16_t READ_ID;
+static uint16_t BUF_LEN;
+static uint8_t *RING_BUFFER;
+
+uint16_t RingBuffer_everMAX = 0;
+
+/***************************RINGBUF_SEND***************************/
+/*
+*warning:this API is not safe for interrupt operation,please ensure only one IRQ functions call this function.
+*/
+int8_t RINGBUF_SEND(const char *buffer,uint16_t len)
+{
+	if(len > RINGBUF_AVALIABLE_SPACE())
+	{
+		return FAIL_LACK_OF_SPACE;
+	}
+
+	uint16_t distance = BUF_LEN - WRITE_ID;
+	if(distance>len)
+	{
+		memcpy((void *)&RING_BUFFER[WRITE_ID],buffer,len);
+		WRITE_ID += len;
+	}
+	else
+	{
+		memcpy((void *)&RING_BUFFER[WRITE_ID],buffer,distance);
+		WRITE_ID = 0;
+		if(len-distance)
+		{
+			memcpy((void *)&RING_BUFFER[WRITE_ID],buffer+distance,len-distance);
+			WRITE_ID = len-distance;
+		}
+	}
+
+	(WRITE_ID+BUF_LEN-READ_ID)%BUF_LEN > RingBuffer_everMAX ? RingBuffer_everMAX = (WRITE_ID+BUF_LEN-READ_ID)%BUF_LEN : 1;
+
+	return WRITE_SUCCEED;
+}
+
+/***************************RINGBUF_READ***************************/
+int8_t RINGBUF_READ(uint8_t *buffer,uint16_t len)
+{
+#ifdef FREERTOS 
+	xSemaphoreTake( xSemaphore_RINGBUF, portMAX_DELAY );//take Mutex for read
+#endif
+
+	if(len > (BUF_LEN - RINGBUF_AVALIABLE_SPACE()))
+	{
+#ifdef FREERTOS 
+		xSemaphoreGive( xSemaphore_RINGBUF );
+#endif
+
+		return FAIL_READ_TOO_FAST;
+	}
+	uint16_t distance = BUF_LEN - READ_ID;
+	if(distance>len)
+	{
+		memcpy((void *)buffer,&RING_BUFFER[READ_ID],len);
+		READ_ID += len;
+	}
+	else
+	{
+		memcpy((void *)buffer,&RING_BUFFER[READ_ID],distance);
+		READ_ID = 0;
+		if(len-distance)
+		{
+			memcpy((void *)(buffer+distance),&RING_BUFFER[READ_ID],len-distance);
+			READ_ID = len-distance;
+		}
+	}
+	*(buffer+len) = NULL;
+
+#ifdef FREERTOS 
+	xSemaphoreGive( xSemaphore_RINGBUF );//give Mutex for read
+#endif
+
+	return READ_SUCCESS;
+}
+
+/***************************RINGBUF_PEEK***************************/
+int8_t RINGBUF_PEEK(uint8_t *buffer,uint16_t len)
+{	
+#ifdef FREERTOS 
+	xSemaphoreTake( xSemaphore_RINGBUF, portMAX_DELAY );//take Mutex for read
+#endif
+
+	if(len > (BUF_LEN - RINGBUF_AVALIABLE_SPACE()))
+	{
+#ifdef FREERTOS 
+		xSemaphoreGive( xSemaphore_RINGBUF );
+#endif
+
+		return FAIL_READ_TOO_FAST;
+	}
+	uint16_t readpoint = READ_ID;
+	uint16_t distance = BUF_LEN - readpoint;
+	if(distance>len)
+	{
+		memcpy((void *)buffer,&RING_BUFFER[readpoint],len);
+		readpoint += len;
+	}
+	else
+	{
+		memcpy((void *)buffer,&RING_BUFFER[readpoint],distance);
+		readpoint = 0;
+		if(len-distance)
+		{
+			memcpy((void *)(buffer+distance),&RING_BUFFER[readpoint],len-distance);
+			readpoint = len-distance;
+		}
+	}
+	*(buffer+len) = NULL;
+	
+#ifdef FREERTOS 
+	xSemaphoreGive( xSemaphore_RINGBUF );
+#endif
+
+	return READ_SUCCESS;
+}
+
+/***************************RINGBUF_INIT***************************/
+void RINGBUF_INIT(uint8_t * ringbuffer,uint16_t len)
+{
+#ifdef FREERTOS
+	xSemaphore_RINGBUF = xSemaphoreCreateMutex();
+#endif
+	
+	WRITE_ID = 0;
+	READ_ID = 0;
+	RING_BUFFER = ringbuffer;
+	BUF_LEN = len;
+	memset(RING_BUFFER,0x00,BUF_LEN);
+}
+
+/***************************RINGBUF_CHECKIO************************/
+uint8_t RINGBUF_CHECKIO(void)
+{
+	if(READ_ID == WRITE_ID)
+		return 0;
+	else
+		return 1;
+}
+
+/****************************RINGBUF_AVALIABLE_SPACE***************/
+uint16_t RINGBUF_AVALIABLE_SPACE()
+{
+	uint16_t len = 0;
+	if(WRITE_ID < READ_ID)
+	{
+		len = READ_ID - WRITE_ID;
+	}
+	else
+	{
+		len = BUF_LEN - (WRITE_ID - READ_ID);
+	}
+	return len;
+}

@@ -168,24 +168,14 @@ void TIM6_IRQHandler(void)
 void USART2_IRQHandler(void)
 {
   /* USER CODE BEGIN USART2_IRQn 0 */
-  uint16_t timeout = 0;
+  uint8_t res;
   /* USER CODE END USART2_IRQn 0 */
-  HAL_UART_IRQHandler(&huart2);
+  // HAL_UART_IRQHandler(&huart2);
   /* USER CODE BEGIN USART2_IRQn 1 */
-  timeout = 0;
-  while (HAL_UART_GetState(&huart2) != HAL_UART_STATE_READY)
+  if (__HAL_UART_GET_FLAG(&huart2, UART_FLAG_RXNE) == pdTRUE)
   {
-    timeout++;
-    if (timeout > HAL_MAX_DELAY)
-      break;
-  }
-
-  timeout=0;
-  while (HAL_UART_Receive_IT(&huart2, (uint8_t*)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
-  {
-    timeout++;
-    if (timeout > HAL_MAX_DELAY)
-      break;
+    res = huart2.Instance->RDR;
+    RINGBUF_SEND((const char *)&res, 1);
   }
   /* USER CODE END USART2_IRQn 1 */
 }

@@ -21,11 +21,7 @@
 #include "usart.h"
 
 /* USER CODE BEGIN 0 */
-uint8_t USART_RX_BUF[USART_REC_LEN];
-
-uint16_t USART_RX_STA = 0;
-
-uint8_t aRxBuffer[RXBUFFERSIZE];
+uint8_t USART1_RingBuff[USART1_BUF_LEN];
 
 /* USER CODE END 0 */
 
@@ -176,41 +172,6 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
 } 
 
 /* USER CODE BEGIN 1 */
-/**
- * 串口接收回调函数
- */
-void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
-{
-  if (huart->Instance == USART2)   // 串口1
-  {
-    if ((USART_RX_STA & 0x8000) == 0) // 接收未完?????
-    {
-      if (USART_RX_STA & 0x4000) // 接收到了0x0D
-      {
-        if (aRxBuffer[0] != 0x0a)
-          USART_RX_STA = 0; // 接收错误，重新接?????
-        else
-          USART_RX_STA |= 0x8000;  // 接收完成
-      }
-      else // 还没接收?????0x0D
-      {
-        if (aRxBuffer[0] == 0x0d)
-        {
-          USART_RX_STA |= 0x4000;
-        }
-        else
-        {
-          USART_RX_BUF[USART_RX_STA & 0X3FFF] = aRxBuffer[0] ;
-          USART_RX_STA++;
-          if (USART_RX_STA > (USART_REC_LEN-1))
-          {
-            USART_RX_STA = 0;   // 接收错误，重新开始接?????
-          }
-        }
-      }
-    }
-  }
-}
 /* USER CODE END 1 */
 
 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/