PIC24F和spi flash通信

发表于 2020-2-20 17:19

有没有人做过PIC和w25q64的通信，我SCK和SDI波形正确，但是没有波形输出

发表于 2020-2-24 10:19

好好查查slave对命令信号的格式要求和时序要求

发表于 2020-2-24 10:43

你看看IO口的初始化嘛...如果是模拟复用口, 要初始化成数字口的哈.

发表于 2020-2-27 10:14

CoolSilicon 发表于 2020-2-24 10:43
你看看IO口的初始化嘛...如果是模拟复用口, 要初始化成数字口的哈.

已经确认过IO是数字口，而且时序也满足slave的要求了，slave就是没有输出

发表于 2020-2-27 10:26

int main(void)
{
// initialize the device
uint8_t temp0,temp1,temp2=0;
SYSTEM_Initialize();
_TRISF0 = 0;
_LATF0 = 1;

while (1)
{
      SPI1_Exchange8bit(0x9F);
      temp0 = SPI1_Exchange8bit(0xFF);
      temp1 = SPI1_Exchange8bit(0xFF);
      temp2 = SPI1_Exchange8bit(0xFF);

      printf("%x, %x, %x,",temp0,temp1,temp2);
      DELAY_milliseconds(2000);
}

return 1;
}

发表于 2020-2-27 10:37

复制

void SPI1_Initialize (void)

{

    // MSTEN Master; DISSDO disabled; PPRE 4:1; SPRE 4:1; MODE16 disabled; SMP Middle; DISSCK disabled; CKP Idle:Low, Active:High; CKE Active to Idle; SSEN disabled; 

    SPI1CON1 = 0x132;

    // SPIFSD disabled; SPIBEN enabled; SPIFPOL disabled; SPIFE disabled; FRMEN disabled; 

    SPI1CON2 = 0x01;

    // SPITBF disabled; SISEL SPI_INT_SPIRBF; SPIRBF disabled; SPIROV disabled; SPIEN enabled; SRXMPT disabled; SPISIDL disabled; 

    SPI1STAT = 0x800C;

}

void SPI1_Exchange( uint8_t *pTransmitData, uint8_t *pReceiveData )

{



    while( SPI1STATbits.SPITBF == true )

    {



    }



    SPI1BUF = *((uint8_t*)pTransmitData);



    while ( SPI1STATbits.SRXMPT == true);



    *((uint8_t*)pReceiveData) = SPI1BUF;

    

}

uint8_t SPI1_Exchange8bit( uint8_t data )

{

    uint8_t receiveData;

    

    SPI1_Exchange(&data, &receiveData);



    return (receiveData);

}

[PIC®/AVR®/dsPIC®产品] PIC24F和spi flash通信

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