mx.c

00001 /*
00002  * mx.c
00003  *
00004  *  Created on: 2019/04/06
00005  *      Author: aruaru
00006  */
00007 #include <stdlib.h>
00008 #include "mx/main.h"
00009 #include "mx/usart.h"
00010 #include "add/mx.h"
00011 
00012 #define TX_BUFFER_SIZE 4000
00013 #define RX_BUFFER_SIZE 40
00014 
00015 extern DMA_HandleTypeDef hdma_usart2_rx;
00016 extern DMA_HandleTypeDef hdma_usart2_tx;
00017 
00018 static char txbuffer[TX_BUFFER_SIZE];
00019 static uint8_t rxbuf[RX_BUFFER_SIZE];
00020 typedef struct{
00021     uint8_t *b;
00022     size_t size;
00023     int pos;
00024 }RxBuffer_t;
00025 RxBuffer_t rxBuffer;
00026 
00027 /*=================================
00028  *  以下はstm32l4xx_it.cから
00029  ==================================*/
00030 
00031 
00032 /**
00033   * @brief This function handles DMA1 channel6 global interrupt.
00034   */
00035 
00036 /**
00037   * @brief This function handles DMA1 channel6 global interrupt.
00038   */
00039 void DMA1_Channel6_IRQHandler(void)
00040 {
00041   /* USER CODE BEGIN DMA1_Channel6_IRQn 0 */
00042 
00043   /* USER CODE END DMA1_Channel6_IRQn 0 */
00044   HAL_DMA_IRQHandler(&hdma_usart2_rx);
00045   /* USER CODE BEGIN DMA1_Channel6_IRQn 1 */
00046 
00047   /* USER CODE END DMA1_Channel6_IRQn 1 */
00048 }
00049 /**
00050   * @brief This function handles DMA1 channel7 global interrupt.
00051   */
00052 void DMA1_Channel7_IRQHandler(void)
00053 {
00054 
00055   HAL_DMA_IRQHandler(&hdma_usart2_tx);
00056 
00057     static int8_t endflag = 0;
00058   if(endflag != 0){//2回目のコール
00059       huart2.gState=HAL_UART_STATE_READY;
00060       endflag = 0;
00061   }else{
00062       endflag++;
00063   }
00064 
00065 }
00066 
00067 
00068 /*
00069  * dmaを利用するための関数
00070  */
00071 
00072 /*
00073  * ローカルのバッファーにコピー後に出力
00074  * 呼び出し元のバッファはなくなる可能性がある
00075  */
00076 HAL_StatusTypeDef printUart(char* buf,int num){
00077     HAL_StatusTypeDef status=HAL_ERROR;
00078     if(hdma_usart2_tx.Instance->CNDTR!=0){
00079         return HAL_BUSY;
00080     }
00081     for(int i=0;i<num && i<4000 ;i++){
00082         *(txbuffer+i)=*buf++;
00083     }
00084 
00085     status = HAL_UART_Transmit_DMA(&huart2, (uint8_t*)txbuffer, num);
00086 
00087     return status;
00088 }
00089 HAL_StatusTypeDef startRxUart(void){
00090 
00091     HAL_StatusTypeDef status;
00092 
00093     rxBuffer.size=RX_BUFFER_SIZE;
00094     rxBuffer.b = (uint8_t*)malloc(sizeof(char)*rxBuffer.size);
00095     if(rxBuffer.b==0)return HAL_ERROR;
00096     rxBuffer.pos = 0;
00097 
00098     status = HAL_UART_Receive_DMA(&huart2, rxBuffer.b, rxBuffer.size);
00099     return status;
00100 }
00101 int getChar(char* c){
00102     if(readable()>0){
00103         *c=*(rxBuffer.b+rxBuffer.pos++);
00104         rxBuffer.pos %= rxBuffer.size;
00105         return 1;
00106     }else{
00107         return 0;
00108     }
00109 }
00110 int readable(void){
00111     int cndtr,pos;
00112     cndtr = hdma_usart2_rx.Instance->CNDTR;
00113     pos = rxBuffer.size - cndtr;
00114     if( pos != rxBuffer.pos ){
00115         return 1;
00116     }else{
00117         return 0;
00118     }
00119 }
00120 int readCndtr(void){
00121     return (int) hdma_usart2_rx.Instance->CNDTR;
00122 }
00123 int readPos(void){
00124     return rxBuffer.pos;
00125 }