GD32F470系列Rs-485驅動程序

ID:1075158 · 發表于 2024-2-27 13:27

/*
主程序如下
main.c
使用中斷+DMA數據搬運實現驅動RS-458
*/
#include "gd32f4xx.h"
#include "systick.h"
#define USART1_DATA_ADDRESS ((uint32_t)&USART_DATA(USART1))
#define RS485BufferSize 256
uint8_t RS485RxBuffer[RS485BufferSize]={0}; //485數據接收緩沖區
uint8_t RS485RxP = 0; //485接收緩沖區接收位置指示
uint8_t RS485RxPre = 0; //485幀頭指示
uint8_t RS485TxBuffer[RS485BufferSize]={0}; //485數據發送緩沖區
uint8_t RS485TxP = 0; //485發送緩沖區發送位置指示
uint8_t RS485RxFrameBuffer[RS485BufferSize]; //485接收幀緩沖
uint8_t RS485RxCount = 0; //485接收計數
uint8_t RS485RxFlag = 0; //RS485幀接收完成標志,邏輯1有效
/*485OE使用PE15引腳,高電平發送，低電平接收*/
void Drv_485OE_Init(void)
{
/* 打開GPIOE時鐘 */
rcu_periph_clock_enable(RCU_GPIOE);
/* 配置PE15口為推挽輸出,無上下拉 */
gpio_mode_set(GPIOE, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_15);
gpio_output_options_set(GPIOE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_15);
/* 默認485處于接受模式 */
Drv_485_RxEn();
}
// 485 RX_EN
void Drv_485_RxEn(void)
{
gpio_bit_reset(GPIOE, GPIO_PIN_15);
}
// 485 TX_EN
void Drv_485_TxEn(void)
{
gpio_bit_set(GPIOE, GPIO_PIN_15);
}
//Rs_485初始化
void Drv_Rs_485_Init(void)
{
dma_single_data_parameter_struct dma_init_struct;
/* enable GPIO clock */
rcu_periph_clock_enable(RCU_GPIOB);
/* enable UART clock */
rcu_periph_clock_enable(RCU_USART2);
/* configure the USART2 TX pin and USART2 RX pin */
gpio_af_set(GPIOB, GPIO_AF_7, GPIO_PIN_10); //Tx
gpio_af_set(GPIOB, GPIO_AF_7, GPIO_PIN_11); //Rx
/* configure USART2 TX as alternate function push-pull */
gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5);
/* configure USART2 RX as alternate function push-pull */
gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_11);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_6);
/* USART configure */
usart_deinit(USART2); //取消初始化USART2
usart_baudrate_set(USART2, 38400U); //波特率38400U
usart_receive_config(USART2, USART_RECEIVE_ENABLE);
usart_transmit_config(USART2, USART_TRANSMIT_ENABLE);
usart_enable(USART2);
usart_interrupt_flag_clear(USART2, USART_INT_FLAG_ERR_ORERR);
usart_interrupt_enable(USART2, USART_INT_ERR);
/* USART interrupt configuration */
nvic_irq_enable(USART2_IRQn, 2, 0); //優先級為2
/* deinitialize DMA0 channel2 (USART0 RX) */
rcu_periph_clock_enable(RCU_DMA0);
dma_deinit(DMA0, DMA_CH1);
dma_init_struct.direction = DMA_PERIPH_TO_MEMORY;
dma_init_struct.memory0_addr = (uint32_t)RS485RxBuffer;
dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dma_init_struct.number = sizeof(RS485RxBuffer);
dma_init_struct.periph_addr = (uint32_t)&USART_DATA(USART2);
dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dma_init_struct.periph_memory_width = DMA_PERIPH_WIDTH_8BIT;
dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
dma_single_data_mode_init(DMA0, DMA_CH1, &dma_init_struct);
/* configure DMA mode */
dma_circulation_enable(DMA0, DMA_CH1); //啟用DMA循環模式
dma_channel_subperipheral_select(DMA0, DMA_CH1, DMA_SUBPERI4);
/* enable DMA0 channel5 */
dma_channel_enable(DMA0, DMA_CH1);
usart_dma_receive_config(USART2, USART_RECEIVE_DMA_ENABLE);
usart_interrupt_enable(USART2,USART_INT_IDLE); //IDLE線檢測中斷
/*485 OE引腳初始化*/
Drv_485OE_Init();
}
/*
void Drv_rs485_Tx(uint8_t *buffer,uint16_t Longth):485發送數據函數
buffer:數據緩沖區
Longth：發送數據長度，單位：字節
*/
void Drv_rs485_Tx(uint8_t *buffer,uint16_t Longth)
{
uint16_t i = 0;
Drv_485_TxEn();
for(i=0;i<Longth;i++)
{
usart_data_transmit(USART2, buffer);
while(RESET == usart_flag_get(USART2, USART_FLAG_TC));
}
Drv_485_RxEn();
}
//中斷服務函數
void USART2_IRQHandler(void)
{
uint16_t i = 0;
//UART1接收空閑中斷處理函數
if(RESET != usart_interrupt_flag_get(USART2, USART_INT_FLAG_IDLE)){ //總線空閑
/* clear IDLE flag */
usart_data_receive(USART2);
if(RS485RxFlag == 0) //僅在數據處理完成的情況下接收新的幀
{
RS485RxCount = RS485BufferSize - (dma_transfer_number_get(DMA0, DMA_CH1));
for(i=0;i<RS485RxCount;i++)
{
RS485RxFrameBuffer = RS485RxBuffer; //將接收緩沖區數據導入幀緩沖區
}
if(RS485RxCount > 0)
{
RS485RxFlag = 1; //標記收到1幀數據
}
}
//重啟DMA
dma_channel_disable(DMA0, DMA_CH1);
dma_flag_clear(DMA0, DMA_CH1, DMA_FLAG_FTF);
dma_transfer_number_config(DMA0, DMA_CH1, RS485BufferSize);
dma_channel_enable(DMA0, DMA_CH1);
}
if(RESET != usart_interrupt_flag_get(USART2, USART_INT_FLAG_RBNE))
{
usart_interrupt_flag_clear(USART2, USART_INT_FLAG_RBNE);
}
if(RESET != usart_interrupt_flag_get(USART2, USART_INT_FLAG_RBNE_ORERR))
{
usart_interrupt_flag_clear(USART2, USART_INT_FLAG_RBNE_ORERR);
}
if(RESET != usart_interrupt_flag_get(USART2, USART_INT_FLAG_ERR_NERR))
{
usart_interrupt_flag_clear(USART2, USART_INT_FLAG_ERR_NERR);
}
if(RESET != usart_interrupt_flag_get(USART2, USART_INT_FLAG_ERR_FERR))
{
usart_interrupt_flag_clear(USART2, USART_INT_FLAG_ERR_FERR);
}
}
int main(void)
{
/**************系統初始化部分**********************/
SystemInit(); //系統初始化
systick_config(); //系統時鐘加載
Drv_485OE_Init(); //RS-485驅動初始化
}

復制代碼

帳號		自動登錄	找回密碼
密碼			立即注冊

久久久久久久999_99精品久久精品一区二区爱城_成人欧美一区二区三区在线播放_国产精品日本一区二区不卡视频_国产午夜视频_欧美精品在线观看免费

GD32F470系列Rs-485驅動程序

評分