STM32F407 USART +DMA共思路DMA通道,进行数据转发.doc

/** ****************************************************************************** * @file IO_Toggle/main.c * @author MCD Application Team * @version V1.0.0 * @date 19-September-2011 * @brief Main program body ****************************************************************************** * @attention * * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. * * h2centercopy; COPYRIGHT 2011 STMicroelectronics/center/h2 ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include stm32f4xx.h //串口1连接电脑的USB-TTL小板子，串口2连接MAX485 /* Private typedef -----------------------------------------------------------*/ #define TX_MODE 0 #define RX_MODE 1 unsigned long boundrate[7]={600,2400,4800,9600,19200,38400,57600}; /* Private variables ---------------------------------------------------------*/ __IO unsigned char uart_rx_tx_buf[2]; USART_InitTypeDef USART_InitStruct; DMA_InitTypeDef DMA_InitStruct; GPIO_InitTypeDef GPIO_InitStruct; NVIC_InitTypeDef NVIC_InitStructure; /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None */ void uart_1_dma_init(void); void uart_2_dma_init(void); void Set485Mode(unsigned char flag); void Set_1_rate(unsigned char rate_num); void Set_2_rate(unsigned char rate_num); void _485PinConfig(void)