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发表于 2017-7-4 20:06:35
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#include "USART1.H"
u16 USART1_RX_COUNT; //DMA½óêÕ¼Æêy
u8 USART1_TX_BUF[USART1_TX_BUF_SIZE]; //·￠Ëíêy×é
u8 USART1_RX_BUF[USART1_RX_BUF_SIZE]; //½óêÕêy×é
UART_HandleTypeDef usart1_handler; //USART1¾ä±ú
DMA_HandleTypeDef usart1_tx_dma_handler; //USART1DMA·￠Ëí¾ä±ú
DMA_HandleTypeDef usart1_rx_dma_handler; //USART1DMA½óêÕ¾ä±ú
#pragma import(__use_no_semihosting)
//±ê×¼¿aDèòaμÄÖ§3Öoˉêy
struct __FILE
{
int handle;
};
FILE __stdout;
//¶¨òå_sys_exit()òÔ±üÃaê1óðëÖ÷»úÄ￡ê½
void _sys_exit(int x)
{
x = x;
}
//Öض¨òåfputcoˉêy
int fputc(int ch, FILE *f)
{
while((USART1->ISR&0X40)==0); //Ñ-»··￠Ëí,Ö±μ½·￠Ëííê±Ï
USART1->TDR=(u8)ch;
return ch;
}
void usart1_init(u32 bound)
{
//IO3õê¼»ˉ
{
GPIO_InitTypeDef GPIO_init; //GPIO¾ä±ú
__HAL_RCC_GPIOA_CLK_ENABLE(); //ê1ÄüGPIOAê±Öó
GPIO_init.Pin=GPIO_PIN_9|GPIO_PIN_10; //PA9
GPIO_init.Mode=GPIO_MODE_AF_PP; //¸′óÃíÆíìêä3ö
GPIO_init.Pull=GPIO_PULLUP; //éÏà-
GPIO_init.Speed=GPIO_SPEED_FAST; //¸ßËù
GPIO_init.Alternate=GPIO_AF7_USART1; //¸′óÃÎaUSART1
HAL_GPIO_Init(GPIOA,&GPIO_init); //3õê¼»ˉPA9
}
//UART 3õê¼»ˉéèÖÃ
{
__HAL_RCC_USART1_CLK_ENABLE(); //ê1ÄüUSART1ê±Öó
usart1_handler.Instance=USART1; //USART1
usart1_handler.Init.BaudRate=bound; //2¨ìØÂê
usart1_handler.Init.WordLength=UART_WORDLENGTH_8B; //8λêy¾Y
usart1_handler.Init.StopBits=UART_STOPBITS_1; //1λí￡Ö1
usart1_handler.Init.Parity=UART_PARITY_NONE; //2»D￡Ñé
usart1_handler.Init.HwFlowCtl=UART_HWCONTROL_NONE; //ó2¼tá÷¿ØÖÆ1Ø
usart1_handler.Init.Mode=UART_MODE_TX_RX; //·￠Ëí½óêÕÄ￡ê½
HAL_UART_Init(&usart1_handler); //3õê¼»ˉ
HAL_NVIC_EnableIRQ(USART1_IRQn);
HAL_NVIC_SetPriority(USART1_IRQn, 3, 1); //½óêÕÖD¶Ï
__HAL_UART_ENABLE_IT(&usart1_handler,UART_IT_IDLE);
HAL_UART_Receive_IT(&usart1_handler, USART1_RX_BUF, USART1_RX_BUF_SIZE);//¸Ãoˉêy»á¿aÆô½óêÕÖD¶Ï￡o±ê־λUART_IT_RXNE￡¬2￠ÇòéèÖýóêÕ»o3åòÔ¼°½óêÕ»o3å½óêÕ×î′óêy¾Yá¿
}
//DMAÅäÖÃ
{
__HAL_RCC_DMA2_CLK_ENABLE();//DMA2ê±Öóê1Äü
HAL_NVIC_SetPriority(DMA2_Stream2_IRQn, 3, 1);
HAL_NVIC_EnableIRQ(DMA2_Stream2_IRQn);
//Tx DMAÅäÖÃ
{
__HAL_LINKDMA(&usart1_handler,hdmatx,usart1_tx_dma_handler); //½«DMAóëUSART1áaÏμÆeà′(·￠ËíDMA)
usart1_tx_dma_handler.Instance=DMA2_Stream7; //êy¾Yá÷Ñ¡Ôñ
usart1_tx_dma_handler.Init.Channel=DMA_CHANNEL_4; //í¨μàÑ¡Ôñ
usart1_tx_dma_handler.Init.Direction=DMA_MEMORY_TO_PERIPH; //′æ′￠Æ÷μ½íaéè
usart1_tx_dma_handler.Init.PeriphInc=DMA_PINC_DISABLE; //íaéè·ÇÔöá¿Ä￡ê½
usart1_tx_dma_handler.Init.MemInc=DMA_MINC_ENABLE; //′æ′￠Æ÷Ôöá¿Ä￡ê½
usart1_tx_dma_handler.Init.PeriphDataAlignment=DMA_PDATAALIGN_BYTE; //íaéèêy¾Y3¤¶è:8λ
usart1_tx_dma_handler.Init.MemDataAlignment=DMA_MDATAALIGN_BYTE; //′æ′￠Æ÷êy¾Y3¤¶è:8λ
usart1_tx_dma_handler.Init.Mode=DMA_NORMAL; //íaéèá÷¿ØÄ￡ê½
usart1_tx_dma_handler.Init.Priority=DMA_PRIORITY_MEDIUM; //ÖDμèóÅÏ輶
usart1_tx_dma_handler.Init.FIFOMode=DMA_FIFOMODE_DISABLE;
usart1_tx_dma_handler.Init.FIFOThreshold=DMA_FIFO_THRESHOLD_FULL;
usart1_tx_dma_handler.Init.MemBurst=DMA_MBURST_SINGLE; //′æ′￠Æ÷í»·￠μ￥′Î′«êä
usart1_tx_dma_handler.Init.PeriphBurst=DMA_PBURST_SINGLE; //íaéèí»·￠μ￥′Î′«êä
HAL_DMA_DeInit(&usart1_tx_dma_handler);
HAL_DMA_Init(&usart1_tx_dma_handler);
}
//Rx DMAÅäÖÃ
{
__HAL_LINKDMA(&usart1_handler,hdmarx,usart1_rx_dma_handler); //½«DMAóëUSART1áaÏμÆeà′(½óêÕDMA)
usart1_rx_dma_handler.Instance = DMA2_Stream2;
usart1_rx_dma_handler.Init.Channel = DMA_CHANNEL_4;
usart1_rx_dma_handler.Init.Direction = DMA_PERIPH_TO_MEMORY;
usart1_rx_dma_handler.Init.PeriphInc = DMA_PINC_DISABLE;
usart1_rx_dma_handler.Init.MemInc = DMA_MINC_ENABLE;
usart1_rx_dma_handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
usart1_rx_dma_handler.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
usart1_rx_dma_handler.Init.Mode = DMA_NORMAL;
usart1_rx_dma_handler.Init.Priority = DMA_PRIORITY_VERY_HIGH;
usart1_rx_dma_handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&usart1_rx_dma_handler);
HAL_DMA_DeInit(&usart1_rx_dma_handler);
}
}
}
void USART1_IRQHandler(void)
{
if((__HAL_UART_GET_FLAG(&usart1_handler,UART_FLAG_IDLE)!=RESET))
{
HAL_UART_DMAStop(&usart1_handler);
USART1_RX_COUNT=USART1_RX_BUF_SIZE-(__HAL_DMA_GET_COUNTER(&usart1_rx_dma_handler));
printf("the data has been transferred is %d\r\n%s\r\n",USART1_RX_COUNT,USART1_RX_BUF);
HAL_UART_Receive_DMA(&usart1_handler,USART1_RX_BUF,USART1_RX_BUF_SIZE);
__HAL_UART_CLEAR_IT(&usart1_handler,UART_FLAG_IDLE);
HAL_UART_IRQHandler(&usart1_handler);
//HAL_UART_Transmit_DMA(&usart1_handler,USART1_RX_BUF,USART1_RX_BUF_SIZE);//Æô¶ˉ½óêÕ
}
}
void DMA2_Stream2_IRQHandler(void){
HAL_DMA_IRQHandler(&usart1_rx_dma_handler);
}
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发表于 2017-7-4 20:03:13
