同一IC:78F9234模拟SPI读外设数据不同端口成败问题

只看该作者 · 2014-5-17 14:00

同一IC:78F9234模拟SPI读外设数据
设置不同IO端口,P0和P3都无**确读入外设数据,设置为P2却能正确读写外设数据.其它程序不变.
时钟为1MHZ.所有 IO口未作其它用处.未加上拉电阻.
IO端口定义如下:
SCS IO口不变.
#define SCS_IO                                     P12_bit.no3             //spi SCS
#define SCS_OUTPUT()                      PM12_bit.no3 = OUTPUT
#define SCS                                     P12_bit.no3             //spi SCS

采用P0口时作数据口时,无**常读入.
/*
#define SCK_IO                            P0_bit.no0             //spi SCK
#define SCK_OUTPUT()             PM0_bit.no0 = OUTPUT
#define SCK                               P0_bit.no0             //spi SCS

#define SDIO_IO                            P0_bit.no1             //spi SDIO Read and Wirte
#define SDIO_OUTPUT()             PU0_bit.no1 = PULLUP_OFF;       PM0_bit.no1 = OUTPUT       //spi SDIO  Wirte
#define SDIO_INPUT()             PU0_bit.no1 = PULLUP_ON;       PM0_bit.no1 = INPUT             //spi SDIO  Read
#define SDIO                               P0_bit.no1

采用P2口作数据口时,正常.
#define SCK_IO                            P2_bit.no0             //spi SCK
#define SCK_OUTPUT()             PM2_bit.no0 = OUTPUT
#define SCK                               P2_bit.no0             //spi SCS

#define SDIO_IO                            P2_bit.no1             //spi SDIO Read and Wirte
#define SDIO_OUTPUT()             PU2_bit.no1 = PULLUP_OFF;       PM2_bit.no1 = OUTPUT       //spi SDIO  Wirte
#define SDIO_INPUT()             PU2_bit.no1 = PULLUP_ON;       PM2_bit.no1 = INPUT             //spi SDIO  Read
#define SDIO                               P2_bit.no1

采用P3口作数据口时,也无**常读入.
#define SCK_IO                            P3_bit.no3             //spi SCK
#define SCK_OUTPUT()             PM3_bit.no3 = OUTPUT
#define SCK                               P3_bit.no3             //spi SCS

#define SDIO_IO                            P3_bit.no2             //spi SDIO Read and Wirte
#define SDIO_OUTPUT()             PU3_bit.no2 = PULLUP_OFF;       PM3_bit.no2 = OUTPUT       //spi SDIO  Wirte
#define SDIO_INPUT()             PU3_bit.no2 = PULLUP_ON;       PM3_bit.no2 = INPUT             //spi SDIO  Read
#define SDIO                               P3_bit.no2

IO初始化为:
      SCS_OUTPUT();
      SCS = 1;
      SCK_OUTPUT();
      SCK = 0;
      SDIO_INPUT();
      SDIO = 1;

读数据程序如下:
Uint8 ByteRead(void)
{
      Uint8 i,tmp;
SDIO_INPUT ();
SDIO = 1; //sdio pull high
_nop_ ();
_nop_ ();
for(i = 0; i < 8; i++)
{
      if(SDIO)
         tmp = (tmp << 1) | 0x01;
      else
         tmp = tmp << 1;

      SCK = 1;
      _nop_();
      SCK = 0;
}
_nop_ ();
_nop_ ();
return tmp;
}
写数据如下:
void ByteSend(Uint8 src)
{
Uint8 i;
      SDIO_OUTPUT ();
_nop_ ();

for(i = 0; i < 8; i++)
{
      if(src & 0x80)
         SDIO = 1;
      else
         SDIO = 0;

            _nop_();
      SCK = 1;
      _nop_();
      SCK = 0;
      src = src << 1;
}
      _nop_();
      _nop_();
      SDIO_INPUT ();
}
无法理解.程序都一样.为何是这样,是IC问题,还是....?