大侠们，请帮小弟看看，SPI1改成SPI2之后，24L01一直检查不到模块，代码如下

1592501622 · 发表于 2015-9-17 20:40:06

//初始化24L01的IO口 
 
 
void NRF24L01_Init(void) 
{   GPIO_InitTypeDef GPIO_InitStruct; 
SPI_InitTypeDef SPI_InitStruct; 
 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB ,ENABLE); 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);    //spi2时钟 
 
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; 
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP; 
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; 
  
GPIO_Init(GPIOB, &GPIO_InitStruct); 
// GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);  //PB13/14/15上拉 
 
  
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE); 
/*CE CSN Initial*/ 
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 ; 
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP; 
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; 
GPIO_Init(GPIOE, &GPIO_InitStruct);  
 
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4 ; 
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP; 
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; 
GPIO_Init(GPIOE, &GPIO_InitStruct);  
 
 
/*IRQ CSN Initial*/ 
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5; 
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU; 
GPIO_Init(GPIOE, &GPIO_InitStruct);  
 
 
 
 
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; 
SPI_InitStruct.SPI_Direction= SPI_Direction_2Lines_FullDuplex; 
SPI_InitStruct.SPI_Mode = SPI_Mode_Master; 
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b; 
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low; 
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge; 
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft; 
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB; 
SPI_InitStruct.SPI_CRCPolynomial = 7; 
SPI_Init(SPI2, &SPI_InitStruct); 
 
SPI_Cmd(SPI2, ENABLE); 
 
 
// SPI1_Init();    //初始化SPI 
NRF24L01_CE=0; //使能24L01 
NRF24L01_CSN=1; //SPI片选取消     
} 
 
//========================================spi的代码 
 
void SPI1_SetSpeed(u8 SPI_BaudRatePrescaler) 
{ 
  assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler)); 
SPI2->CR1&=0XFFC7; 
SPI2->CR1|=SPI_BaudRatePrescaler; //设置SPI2速度  
SPI_Cmd(SPI2,ENABLE);  
 
}  
 
//SPIx 读写一个字节 
//TxData:要写入的字节 
//返回值:读取到的字节 
u8 SPI1_ReadWriteByte(u8 TxData) 
{  
u8 retry=0;  
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET) //检查指定的SPI标志位设置与否:发送缓存空标志位 
{ 
retry++; 
if(retry>200)return 0; 
}   
SPI_I2S_SendData(SPI2, TxData); //通过外设SPIx发送一个数据 
retry=0; 
 
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET) //检查指定的SPI标志位设置与否:接受缓存非空标志位 
{ 
retry++; 
if(retry>200)return 0; 
}       
return SPI_I2S_ReceiveData(SPI2); //返回通过SPIx最近接收的数据     
} 
<div>
//======================================================主程序 
 
 
int main(void) 
{  
 RCC_Configuratio();  // 使能各模块时钟 
delay_init();   //初始化延时系统 
GPIO_Configuration(); //初始化IO口 
ADC1_Configuration();  //初始化AD 
DMA_Configuration(); 
ADC_SoftwareStartConvCmd(ADC1, ENABLE); 
DMA_Cmd(DMA1_Channel1, ENABLE); //启动DMA通道 
   
NRF24L01_Init();    //初始化NRF24L01  
  
 while(NRF24L01_Check());//检测不到24L01    //一直卡在这里，不能跳出循环 
<div>
 
</div>
 
</div>