PIC24F和spi flash通信

2万 · 2021-7-3 10:21

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

2万 · 2021-7-3 10:23

好好查查slave对命令信号的格式要求和时序要求

1万 · 2021-7-3 10:27

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.

2万 · 2021-7-3 10:29

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

2万 · 2021-7-3 10:31

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;
}

2万 · 2021-7-3 10:33

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);
}

只看该作者 · 2021-7-3 18:57

那就是操作时序和命令不对