我用STM32F0xx通過SPI通信連接Si4438.
SPI已經配置好了，發送PART_INFO指令到Si4438，但是返回的數據不對。請各位大神指導下，謝謝。
************Si4438函數****************************
void Si44xx_Wait_Cts(u8 cnt)
{
u8 l_ReadCtsTimes = 0;
SPI_CS_LOW();
while(1)
{
delay_us(2);
SPI_ExchangeByte( READ_CMD_BUFF );
if( SPI_ExchangeByte(0xFF)==0xFF )
{
break;
}else if( cnt<l_ReadCtsTimes++ )
{
break;
}
}
SPI_CS_HIGH();
}
void Si44xx_Write_Cmds( u8 *cmd, u8 len )
{
Si44xx_Wait_Cts(2);
SPI_CS_LOW();
delay_us(2);
while(len--)
{
SPI_ExchangeByte( *cmd );
cmd++;
}
SPI_CS_HIGH();
Si44xx_Wait_Cts(50);
}
void Si44xx_Read_Response( u8 *pRead, u8 Length )
{
SPI_CS_LOW();
delay_us(2);
SPI_ExchangeByte( READ_CMD_BUFF );
while( Length-- )
{
*pRead = SPI_ExchangeByte( 0xFF );
pRead++;
}
SPI_CS_HIGH();
}
uint8_t Si44xx_Get_Device_Status( void )
{
SI44xxCmd[0] = REQUEST_DEVICE_STATE;
SI44xxCmd[1] = 0x00;
SI44xxCmd[2] = 0x00;
Si44xx_Write_Cmds( SI44xxCmd, 1 );
Si44xx_Read_Response( SI44xxCmd, 3 );
return (SI44xxCmd[1]&0x0F);
}
void SI446X_PART_INFO( u8 *buffer )
{
u8 cmd = PART_INFO;
Si44xx_Write_Cmds( &cmd, 1 );
Si44xx_Read_Response( buffer, 8 );
}
**********************************************
**************SPI*****************************
uint8_t SPI_ExchangeByte( uint8_t TxByte )
{
uint8_t l_Data = 0;
uint16_t l_WaitTime = 0;
while( RESET == SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) ) //等待發送緩沖區為空
{
if( SPI_WAIT_TIMEOUT == ++l_WaitTime )
{
break; //如果等待超時則退出
}
}
l_WaitTime = SPI_WAIT_TIMEOUT / 2; //重新設置接收等待時間(因為SPI的速度很快，正常情況下在發送完成之后會立即收到數據，等待時間不需要過長)
SPI1->DR = TxByte; //發送數據
while( RESET == SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) ) //等待接收緩沖區非空
{
if( SPI_WAIT_TIMEOUT == ++l_WaitTime )
{
break; //如果等待超時則退出
}
}
l_Data = (uint8_t)SPI1->DR; //讀取接收數據
return l_Data; //返回
}
*******************************************************************
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