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gd32f130G8U6RS485实现串口接收数据

gd32f130G8U6RS485实现串⼝接收数据最近在实现lora通信⽹关的代码，⽤到了RS485实现串⼝接收数据，其主要代码及完整代码如下：

RS485串⼝初始化：

/*串⼝1初始化*/

void rs485_usart_init(){

rcu_periph_clock_enable(RCU_USART1);//使能串⼝时钟

usart_disable(USART1);

usart_baudrate_set(USART1, baudrate);//波特率

usart_parity_config(USART1, parity);//奇偶校验位

usart_word_length_set(USART1, wlen);//数据位

usart_stop_bit_set(USART1, stblen);//停⽌位

usart_hardware_flow_rts_config(USART1, USART_RTS_DISABLE);//禁⽤RTS

usart_hardware_flow_cts_config(USART1, USART_CTS_DISABLE);//⽆硬件数据流控制

usart_receive_config(USART1, USART_RECEIVE_ENABLE);//使能接收

usart_transmit_config(USART1, USART_TRANSMIT_ENABLE);//使能发送

usart_enable(USART1);

drv_usart_nvic_init();

usart_interrupt_enable(USART1, USART_INT_RBNE);

}

定时器初始化

void Timer_init(void)

{

timer_parameter_struct timer_initpara;

*使能时钟*/

rcu_periph_clock_enable(RCU_TIMER1);

timer_deinit(TIMER1);

/* TIMER0 configuration */

timer_initpara.prescaler =99;//分频系数

timer_initpara.alignedmode = TIMER_COUNTER_EDGE;

unterdirection = TIMER_COUNTER_UP;//计数⽅式

timer_initpara.period =7199;//重载周期

timer_initpara.clockdivision = TIMER_CKDIV_DIV1;//时钟分频因⼦

petitioncounter =0;

timer_init(TIMER1,&timer_initpara);//初始化

timer_interrupt_enable(TIMER1,TIMER_INT_UP);//允许中断

nvic_irq_enable(TIMER1_IRQn ,1,1);

timer_disable(TIMER1);

}

串⼝1中断服务函数

void USART1_IRQHandler(void)防伪印章

{

uint32_t res;

if( RESET !=usart_flag_get(USART1, USART_FLAG_RBNE))//接收到数据

裂缝检测{

res=usart_data_receive(USART1);

if((RS485_RX_STA &(1<<15))==0)//接收完的⼀批数据，还没有被处理，则不再接收其他数据{

if(RS485_RX_STA <rs485_rx_max)//串⼝1接收缓冲区还没满，还可以接收数据

{

timer_counter_value_config(TIMER1,0);//计数器清空

if(RS485_RX_STA ==0)//⼀次接收的开始时USART3_RX_STA = 0；

{

timer_enable(TIMER1);//使能定时器1

}

RS485_RX_BUF[RS485_RX_CNT]=res;//记录接收到的值

RS485_RX_STA++;//接收数据增加 1

RS485_RX_CNT++;

}

else//定义的最⼤缓冲区满了

{

RS485_RX_STA |=1<<15;//强制标记接收完成

}

RS485接收函数

void rs485_receive(uint8_t * buf){

铂钛催化剂if(((RS485_RX_STA>>15)&1)==1){

uint8_t rxlen=RS485_RX_CNT;

uint8_t i;

//led_on();

/* turn on LED2 */

gpio_bit_set(GPIOB, GPIO_PIN_0);

/* insert 200 ms delay */

delay_1ms(1000000);

/* turn on LED3 */

gpio_bit_reset(GPIOB, GPIO_PIN_0);

/* insert 200 ms delay */

delay_1ms(1000000);

/ gpio_bit_set(GPIOB, GPIO_PIN_0);

if(rxlen>0){

// gpio_bit_set(GPIOB, GPIO_PIN_0);

timer_disable(TIMER1);//关闭定时器

if(rxlen==RS485_RX_CNT&&rxlen){

for(i=0;i<rxlen;i++){

buf[i]=RS485_RX_BUF[i];

}

RS485_RX_CNT=0;

rs485_send(buf,rxlen);

}

RS485_RX_STA =0;

}

定时器1中断服务函数：

//定时器 1 中断服务程序⑥

void TIMER1_IRQHandler(void)//TIM1 中断

{

if(timer_interrupt_flag_get(TIMER1, TIMER_INT_FLAG_UP)!= RESET)//检查 TIM3 更新中断发⽣与否{

timer_interrupt_flag_clear(TIMER1, TIMER_INT_FLAG_UP );//清除 TIM3 更新中断标志

RS485_RX_STA |=1<<15;// 标记接收完成

}

主函数代码如下：

int main(void)

{

systick_config();

Timer_init();

/*硬件初始化*/

rs485_hw_init();

/*串⼝初始化*/

rs485_usart_init();

LED_INIT();

RS485_RX_STA =0;

//gpio_bit_set(GPIOA,GPIO_PIN_8);

while(1)

{

//rs485_send(send_buf,2);

rs485_receive(rebuf);

// delay_1ms(1000);

}

完整代码如下：

#include "gd32f1x0.h"

#include "systick.h"

#include <stdio.h>

#include "gd32f1x0_rcu.h"

#include "gd32f1x0_usart.h"

#include "gd32f1x0_gpio.h"

#include "SPI.h"

#include "gd32f1x0_dma.h"

#include "gd32f1x0_misc.h"

#include "gd32f1x0_timer.h"

#include<stdio.h>

uint8_t vali_1=0;

unsigned char channel;

uint8_t send_buf[2]={0x01,0x00};

uint8_t rebuf[256];

uint16_t rs485_rx_max=64;

uint16_t RS485_RX_STA=0;

uint8_t RS485_RX_BUF[64];//接收缓冲，最⼤ 64 个字节.

//接收到的数据长度

uint8_t RS485_RX_CNT=0;

//串⼝信息

//static uint8_t reset_flag = 0;

static uint32_t baudrate=9600;

static uint32_t parity = USART_PM_NONE;

static uint32_t wlen = USART_WL_8BIT;

static uint32_t stblen = USART_STB_1BIT;

void Timer_init(void);

static void drv_usart_nvic_init(void);

/*接收使能*/

void rs485_receive_enable(){

gpio_bit_set(GPIOA, GPIO_PIN_8);

}

*发送使能*/

void rs485_send_enable(){

gpio_bit_reset(GPIOA, GPIO_PIN_8);

}

void rs485_hw_init(){

/* enable the led clock */

rcu_periph_clock_enable(RCU_GPIOA);假牙清洁剂

/* connect port to USARTx_Tx */登船梯

gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_2);

/* connect port to USARTx_Rx */

gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_3);

* configure USART Tx as alternate function push-pull */

gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_2);

gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_2);

/* configure USART Rx as alternate function push-pull */

gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_3);

gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_3); //配置使能端⼝

gpio_mode_set(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_8);

gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OTYPE_PP, GPIO_PIN_8);

//gpio_bit_reset(GPIOA, GPIO_PIN_8);

rs485_receive_enable();

}

/*中断初始化*/

static void drv_usart_nvic_init(void)

{

nvic_irq_enable(USART1_IRQn,0,0);

}

/*串⼝1初始化*/

void rs485_usart_init(){

rcu_periph_clock_enable(RCU_USART1);//使能串⼝时钟

usart_disable(USART1);

usart_baudrate_set(USART1, baudrate);//波特率

usart_parity_config(USART1, parity);//奇偶校验位

usart_word_length_set(USART1, wlen);//数据位

usart_stop_bit_set(USART1, stblen);//停⽌位

usart_hardware_flow_rts_config(USART1, USART_RTS_DISABLE);//禁⽤RTS

usart_hardware_flow_cts_config(USART1, USART_CTS_DISABLE);//⽆硬件数据流控制usart_receive_config(USART1, USART_RECEIVE_ENABLE);//使能接收

usart_transmit_config(USART1, USART_TRANSMIT_ENABLE);//使能发送

usart_enable(USART1);

drv_usart_nvic_init();

usart_interrupt_enable(USART1, USART_INT_RBNE);

}

//发送数据

void rs485_send(uint8_t * buf,uint8_t len){

uint8_t t=0;

rs485_send_enable();

for(t=0;t<len;t++){

while(RESET ==usart_flag_get(USART1, USART_FLAG_TC));

usart_data_transmit(USART1, buf[t]);//发送数据

//gpio_bit_set(GPIOB, GPIO_PIN_0);

}

while(RESET ==usart_flag_get(USART1, USART_FLAG_TC));

rs485_receive_enable();

}

void LED_INIT(){

rcu_periph_clock_enable(RCU_GPIOB);

gpio_mode_set(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_0);

/* configure LEDs GPIO port */

//gpio_init(GPIOB, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0);

gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0); /* reset LEDs GPIO pin */