吹水
写了快半年go语言吧，毕业后还是打算从事嵌入式，重新捡起来，调这个我犯了个很睿智的问题，调了两天才发现！就是配置串口相关的参数！一定要配置对！开始我通过串口和ld3320连接，有数据传输，32的串口也能接收到电脑发的数据，但是两个连起来就是拿不到数据，最后洗澡的时候才想起来ld3320给的波特率不是115200而是9600。
ld3320那边的程序如何修改就不贴了，网上蛮多的。
硬件平台
工程代码
ld3320连接USART1，通过透传的方式将获取到的数据通过USART2打印出来
main.c
#include "stm32f10x.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "led.h"
#include "usart.h"
#include "delay.h"
int main()
{
Led_init();
usart1_init();
usart2_init();
initSysTick();
printf("main start!");
GPIO_ResetBits(GPIOC, GPIO_Pin_13);
delay_ms(300);
GPIO_SetBits(GPIOC, GPIO_Pin_13);
}
//串口中断
void USART1_IRQHandler(void)
{
int temp;
while(USART_GetITStatus(USART1,USART_IT_RXNE) != RESET){
temp = USART_ReceiveData(USART1);
printf("%c",temp);
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
}
}
delay.c
#include "stm32f10x.h"
#include "delay.h"
void initSysTick(void)
{
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //éè??ê±?ó?′8·???
SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk; //ê1?ü?D??
SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; //?a?¨ê±?÷
SysTick->LOAD = 9; //??òaéè??ò?????×°???μ
}
/**
* 1|?ü￡o?￠?????óê±oˉêy
* 2?êy￡oxus ￡o??ì??óê±ê±?? (μ￥??￡o?￠??)
* ·μ???μ￡oNone
*/
void delay_us(u32 xus)
{
SysTick->LOAD = 9 * xus; //??9′??a1us￡?xus?ò??×°???μòa*9
SysTick->VAL = 0; //??êy?÷1éá?
while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));//μè′y??êyíê3é
}
/**
* 1|?ü￡ooá?????óê±oˉêy
* 2?êy￡oxms ￡o??ì??óê±ê±?? (μ￥??￡ooá??)
* ·μ???μ￡oNone
*/
void delay_ms(u32 xms)
{
SysTick->LOAD = 9000; //??9′??a1ms￡?1000′??a1s
SysTick->VAL = 0; //??êy?÷1éá?
while (xms--)
{
while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));//μè′yμ￥′???êyíê3é
}
}
delay.h
#ifndef _DELAY_H_
#define _DELAY_H_
#include "stm32f10x.h"
void initSysTick(void);
void delay_us(u32 xus);
void delay_ms(u32 xms);
#endif
usart.c
#include "usart.h"
#include "stm32f10x.h"
void usart1_init(void)
{
GPIO_InitTypeDef gpio_init;
USART_InitTypeDef usartStruct;
NVIC_InitTypeDef nvic_initStruct;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//1.????ê±?ó￡oGPIO?úμ?ê±?ó￡?òy???′ó?μ?ê±?ó￡?′??úμ?ê±?ó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
//2.????GPIOμ??á11ì?
//USART1 TX --- PA9,RX --- PA10
//2.1 TX
gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
gpio_init.GPIO_Pin = GPIO_Pin_9;
gpio_init.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA,&gpio_init);
//2.2 RX
gpio_init.GPIO_Mode = GPIO_Mode_IN_FLOATING;
gpio_init.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA,&gpio_init);
//3.????′??úμ??á11ì?
usartStruct.USART_BaudRate = 9600;
usartStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
usartStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
usartStruct.USART_Parity = USART_Parity_No;
usartStruct.USART_StopBits = USART_StopBits_1;
usartStruct.USART_WordLength = USART_WordLength_8b;
USART_Init(USART1,&usartStruct);
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);//????′??ú?D??
USART_Cmd(USART1, ENABLE );
nvic_initStruct.NVIC_IRQChannel = USART1_IRQn;
nvic_initStruct.NVIC_IRQChannelPreemptionPriority = 1;
nvic_initStruct.NVIC_IRQChannelSubPriority = 1;
nvic_initStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvic_initStruct);
}
void usart2_init(void)
{
GPIO_InitTypeDef gpio_init;
USART_InitTypeDef usartStruct;
// NVIC_InitTypeDef nvic_initStruct;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//1.????ê±?ó￡oGPIO?úμ?ê±?ó￡?òy???′ó?μ?ê±?ó￡?′??úμ?ê±?ó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
//2.????GPIOμ??á11ì?
//USART2 TX --- PA2,RX --- PA3
gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
gpio_init.GPIO_Pin = GPIO_Pin_2;
gpio_init.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOA,&gpio_init);
gpio_init.GPIO_Mode = GPIO_Mode_IN_FLOATING;
gpio_init.GPIO_Pin = GPIO_Pin_3;
GPIO_Init(GPIOA,&gpio_init);
//3.????′??úμ??á11ì?
usartStruct.USART_BaudRate = 115200;
usartStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
usartStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
usartStruct.USART_Parity = USART_Parity_No;
usartStruct.USART_StopBits = USART_StopBits_1;
usartStruct.USART_WordLength = USART_WordLength_8b;
USART_Init(USART2,&usartStruct);
// USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);//????′??ú?D??
USART_Cmd(USART2, ENABLE );
// nvic_initStruct.NVIC_IRQChannel = USART2_IRQn;
// nvic_initStruct.NVIC_IRQChannelPreemptionPriority = 1;
// nvic_initStruct.NVIC_IRQChannelSubPriority = 2;
// nvic_initStruct.NVIC_IRQChannelCmd = ENABLE;
//
// NVIC_Init(&nvic_initStruct);
}
//·a×°á?ò???·￠?í×?·?
void usartSendByte(USART_TypeDef* USARTx, uint16_t Data)
{
USART_SendData(USARTx,Data);
while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
}
//·￠?í×?·?′?
void usartSendStr(USART_TypeDef* USARTx,char *str)
{
uint16_t i = 0;
do{
usartSendByte(USARTx,*(str+i));
i++;
}while(*(str+i) != '\0');
//?D??ê?·?·￠?ííê
while(USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET);
}
int fputc(int ch,FILE *f)
{
USART_SendData(USART2,(uint8_t)ch);
while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
return (ch);
}
int fgetc(FILE *f)
{
while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);
return (int) USART_ReceiveData(USART2);
}
usart.h
#include "stm32f10x.h"
#include <stdio.h>
void usart1_init(void);
void usart2_init(void);
void usartSendByte(USART_TypeDef* USARTx, uint16_t Data);
void usartSendStr(USART_TypeDef* USARTx,char *str);
led.c
#include "stm32f10x.h"
#include "led.h"
void Led_init(void)
{
GPIO_InitTypeDef Led_initStructer;
//1.ê1?üAPB2μ?ê±?óGPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
//2.?á11ì?????
Led_initStructer.GPIO_Mode = GPIO_Mode_Out_PP;
Led_initStructer.GPIO_Pin = GPIO_Pin_13;
Led_initStructer.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOC, &Led_initStructer);
}
led.h
#include "stm32f10x.h"
void Led_init(void);
再次注意！ld3320波特率为9600
