ARM芯片是STM32F103RE,要读取的芯片为SCC2230。
SCC2230的CS接PC5,SCK接PA5,MISO接PA6,MOSI接PA7。中间都通过电阻隔离。
源码如下:
void scc2230_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC, ENABLE );
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1, ENABLE );
//SCK
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//MISO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//MOSI
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIO
//CS
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_SetBits(GPIOC,GPIO_Pin_5);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
int main(void)
{
uint16_t rcv_scc1=0;
uint16_t rcv_scc2=0;
int rcv_data32=0;
scc2230_init();
while(1)
{
//SCC2230
GPIO_ResetBits(GPIOC,GPIO_Pin_5);
while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, 0xFF);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
// while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
rcv_scc1 = SPI_I2S_ReceiveData(SPI1);
rcv_scc2 = SPI_I2S_ReceiveData(SPI1);
rcv_data32 = (rcv_scc1<<16) + rcv_scc2;
}
}
问题是:发送和接收状态查询都会死循环。如果将查询去掉,读到的数据也是0。
请大家帮忙看看,谢谢!
友情提示: 此问题已得到解决,问题已经关闭,关闭后问题禁止继续编辑,回答。
一周热门 更多>