金牌会员
 
- 积分
- 1049
- 金钱
- 1049
- 注册时间
- 2016-9-3
- 在线时间
- 158 小时
|
5金钱
主机：STM32F103R8T6，使用TIM3定时发送数据
程序如下：
void SPI_GPIO_INIT(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
}
void SPI2_INIT(void)
{
SPI_InitTypeDef SPI_InitStructure;
RCC_APB1PeriphClockCmd (RCC_APB1Periph_SPI2,ENABLE);
SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_CPHA=SPI_CPHA_2Edge;
SPI_InitStructure.SPI_CPOL=SPI_CPOL_High;
SPI_InitStructure.SPI_CRCPolynomial=7;
SPI_InitStructure.SPI_DataSize=SPI_DataSize_8b;
SPI_InitStructure.SPI_Direction=SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB;
SPI_InitStructure.SPI_Mode=SPI_Mode_Master;
SPI_InitStructure.SPI_NSS=SPI_NSS_Soft;
SPI_Init(SPI2,&SPI_InitStructure);
SPI_Cmd(SPI2,ENABLE);
}
void TIM3_INIT(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period=999;
TIM_TimeBaseStructure.TIM_Prescaler=7199;
TIM_TimeBaseInit (TIM3,&TIM_TimeBaseStructure);
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM3,ENABLE);
}
void NVIC_INIT(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;
NVIC_Init(&NVIC_InitStructure);
}
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
SPI_I2S_SendData(SPI2,1);
}
}
int main(void)
{
SPI_GPIO_INIT();
SPI2_INIT();
TIM3_INIT();
NVIC_INIT();
while(1);
}
从机：STM32F103C8T6，开启接收中断，每收到数据就向串口打印字符
程序如下：
void SPI_GPIO_INIT(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
}
void SPI2_INIT(void)
{
SPI_InitTypeDef SPI_InitStructure;
RCC_APB1PeriphClockCmd (RCC_APB1Periph_SPI2,ENABLE);
SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_CPHA=SPI_CPHA_2Edge;
SPI_InitStructure.SPI_CPOL=SPI_CPOL_High;
SPI_InitStructure.SPI_CRCPolynomial=7;
SPI_InitStructure.SPI_DataSize=SPI_DataSize_8b;
SPI_InitStructure.SPI_Direction=SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB;
SPI_InitStructure.SPI_Mode=SPI_Mode_Slave;
SPI_InitStructure.SPI_NSS=SPI_NSS_Soft;
SPI_Init(SPI2,&SPI_InitStructure);
SPI_Cmd(SPI2,ENABLE);
SPI_I2S_ITConfig(SPI2,SPI_I2S_IT_RXNE,ENABLE);
}
void NVIC_INIT(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel=SPI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;
NVIC_Init(&NVIC_InitStructure);
}
void SPI2_IRQHandler(void)
{
char c[10]={'N','A','M','M','A','E','E','C','H',' '};
int cnt;
if(SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == SET)
{
SPI_I2S_ClearITPendingBit(SPI2,SPI_I2S_IT_RXNE);
for(cnt=0;cnt<10;cnt++)
{
USART_SendData(USART1,c[cnt]);
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET);
}
}
}
void USART_INIT(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
GPIO_Init(GPIOA,&GPIO_InitStructure);
USART_InitStructure.USART_BaudRate=9600;
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
USART_InitStructure.USART_Parity=USART_Parity_No;
USART_InitStructure.USART_StopBits=USART_StopBits_1;
USART_InitStructure.USART_WordLength=USART_WordLength_8b;
USART_Init(USART1,&USART_InitStructure);
USART_Cmd(USART1,ENABLE);
USART_ClearFlag(USART1,USART_FLAG_TC);
}
int main(void)
{
SPI_GPIO_INIT();
SPI2_INIT();
NVIC_INIT();
USART_INIT();
while(1);
}
|
最佳答案
查看完整内容[请看2#楼]
对的， 不好意思，我马虎了；；这个问题找到了解决办法，就是读DR寄存器来清除中断标志。SPI_I2S_ClearITPendingBit(SPI2,SPI_I2S_IT_RXNE);这个函数操作的是SR寄存器，只是清除了状态
|
/2 
|手机版|OpenEdv-开源电子网
( 粤ICP备12000418号-1 )
发表于 2018-6-5 10:32:07
楼主
；；这个问题找到了解决办法，就是读DR寄存器来清除中断标志。SPI_I2S_ClearITPendingBit(SPI2,SPI_I2S_IT_RXNE);这个函数操作的是SR寄存器，只是清除了状态
