现有一个小需求，使用STM32F1系列单片机做串口2的收发数据的功能，通过PC上的串口调试助手给单片机发一串数据，单片机收到数据后再给PC的串口调试助手发回去。
先前有一篇是通过串口查询方式实现的，本次使用串口中断方式实现。
STM32使用USART2，对应单片机的PA1控制方向，PA2发送，PA3接收。
代码如下：
main.c
#include "stm32f10x.h"
u8 chs[128];
u8 flag_recv;
u8 len_recv;
u8 *p_ch;
void init_hardware_usart2_(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = bound;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
USART_Cmd(USART2, ENABLE);
USART_ClearFlag(USART2, USART_FLAG_TC);
GPIO_ResetBits(GPIOA, GPIO_Pin_1);
}
void func_usart2_send_a_byte_(u8 abyte)
{
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
USART_SendData(USART2, abyte);
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
}
void func_usart2_send_bytes_(u8 *bytes, u8 bytes_len)
{
u8 i;
GPIO_SetBits(GPIOA, GPIO_Pin_1);
for(i = 0; i < bytes_len; i++)
{
func_usart2_send_a_byte_(bytes
);
}
GPIO_ResetBits(GPIOA, GPIO_Pin_1);
}
int main()
{
//u8 recv_ch;
p_ch = chs;
len_recv = 0;
init_hardware_usart2_(9600);
while(1)
{
}
}
void USART2_IRQHandler(void)
{
u8 rx_dat;
if(USART_GetITStatus(USART2,USART_IT_RXNE) == SET)
{
flag_recv = 1;
rx_dat = USART_ReceiveData(USART2);
if(p_ch < &chs[127])
{
*p_ch ++ = rx_dat;
len_recv ++;
}
}
if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)
{
if(flag_recv == 1)
{
func_usart2_send_bytes_(chs, len_recv);
len_recv = 0;
p_ch = chs;
}
flag_recv = 0;
}
}
效果如下：
经过测试发现，串口调试助手给单片机发送了1W+多次，失误率为0，准确率可以应用。
测试代码，仅供参考。
现有一个小需求，使用STM32F1系列单片机做串口2的收发数据的功能，通过PC上的串口调试助手给单片机发一串数据，单片机收到数据后再给PC的串口调试助手发回去。
先前有一篇是通过串口查询方式实现的，本次使用串口中断方式实现。
STM32使用USART2，对应单片机的PA1控制方向，PA2发送，PA3接收。
代码如下：
main.c
#include "stm32f10x.h"
u8 chs[128];
u8 flag_recv;
u8 len_recv;
u8 *p_ch;
void init_hardware_usart2_(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = bound;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
USART_Cmd(USART2, ENABLE);
USART_ClearFlag(USART2, USART_FLAG_TC);
GPIO_ResetBits(GPIOA, GPIO_Pin_1);
}
void func_usart2_send_a_byte_(u8 abyte)
{
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
USART_SendData(USART2, abyte);
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
}
void func_usart2_send_bytes_(u8 *bytes, u8 bytes_len)
{
u8 i;
GPIO_SetBits(GPIOA, GPIO_Pin_1);
for(i = 0; i < bytes_len; i++)
{
func_usart2_send_a_byte_(bytes
);
}
GPIO_ResetBits(GPIOA, GPIO_Pin_1);
}
int main()
{
//u8 recv_ch;
p_ch = chs;
len_recv = 0;
init_hardware_usart2_(9600);
while(1)
{
}
}
void USART2_IRQHandler(void)
{
u8 rx_dat;
if(USART_GetITStatus(USART2,USART_IT_RXNE) == SET)
{
flag_recv = 1;
rx_dat = USART_ReceiveData(USART2);
if(p_ch < &chs[127])
{
*p_ch ++ = rx_dat;
len_recv ++;
}
}
if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)
{
if(flag_recv == 1)
{
func_usart2_send_bytes_(chs, len_recv);
len_recv = 0;
p_ch = chs;
}
flag_recv = 0;
}
}
效果如下：
经过测试发现，串口调试助手给单片机发送了1W+多次，失误率为0，准确率可以应用。
测试代码，仅供参考。
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