stm32作为从设备,要通过spi2和主设备通讯。
现在是用中断接收数据的,接收完一帧信息后置个标志位。
主程序里有个函数,函数中判断spi接收标志位,如果是1的话,通过串口将接收到的数据发送出来。
以上这部分,磕磕碰碰的算是调通了(画了很久)。主函数里不能只做spi通讯部分吧,然后加上其他程序部分。结果spi通讯这里就不工作了...
- while(1)
- {
- SPI2_SalveProcess();
- printf("\r\n\r\nhahaha);
- }
主函数里的第一个语句,是spi2通讯部分的函数,如果只保留这个,通讯没问题。然后在其后随便加了个printf语句,结果spi通讯就不工作了...
具体现象是,不再通过串口将接收到的数据发送过来,并且作为spi从设备,接收数据的同时,应该也发送数据,结果,没有数据发出去。
以下为SPI2_SalveProcess()函数:
- void SPI2_SalveProcess()
- {
- u8 i;
- if(COMP_OK())
- {
- LVDS_EN(0);
- }
- else
- {
- if(GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_7) == 0)
- {
- LVDS_EN(1);
- SPI_I2S_SendData(SPI2, spi2RecvBuff[0]);
- }
- }
- if(spi2RecvOk == 1)
- {
- printf("\r\nSPI2 recive sucess");
- for(i = 0; i < 5; i++)
- printf("\r\nspi2RecvBuff[%d]: %04x", i, spi2RecvBuff);
- spi2RecvOk = 0;
- spi2RecvNum = 0;
- }
- }
以下为spi2中断处理函数:
- void SPI2_IRQHandler(void)
- {
- u16 spi2Temp;
- spi2Temp = SPI_I2S_ReceiveData(SPI2);
- if(spi2RecvOk == 0)
- {
- if(spi2RecvNum == 0)
- {
- if((spi2Temp & 0xff00) == 0x3a00)
- {
- SPI_I2S_SendData(SPI2, spi2SendBuff[1]);
- spi2RecvBuff[0] = spi2Temp;
- spi2RecvNum = 1;
- spi2SendNum = 2;
- }
- else
- SPI_I2S_SendData(SPI2, spi2SendBuff[0]);
- }
- else
- {
- SPI_I2S_SendData(SPI2, spi2SendBuff[spi2SendNum]);
- spi2RecvBuff[spi2RecvNum] = spi2Temp;
- spi2RecvNum++;
- if(spi2RecvNum > 4)
- spi2RecvOk = 1;
- spi2SendNum += 1;
- spi2SendNum %= 5;
- }
- }
- }
串口只开了接收中断,并且,现在的操作,并没有通过串口向单片机发送数据。
spi2也只是开了接收中断。
以下为中断优先级配置:
- void NVIC_Configuration(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
- NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
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