请教DDP4422的SPI通信异常问题

 您好！我们的项目使用到了DDP4422的SPI接口SSP_PORT1，DDP4422作为主与C787芯片进行通信。

DDP向C787写数据是正常的；但读数据时，读到的数据不正确。我这边尝试过

使用SSP.h中的下列API，都不能读到正确的数据。

SSP_Read

SSP_PolledRead

SSP_PolledWriteRead

SSP_PolledWriteWithRead

   我想请教, 该如何使用上面的API? 谢谢！下面是SPI初始化及读写的接口函数。

#include "common.h"
#include "gpio.h"
#include "ssp.h"
#include "dbmessage.h"

int g_current_bank;

void SysInit(void)
{
SSPINIT spi_cfg;
spi_cfg.PortEnable = TRUE;
spi_cfg.PortMode = SSP_MASTER;
spi_cfg.XFERMode = SSP_XFER_AUTO;
spi_cfg.ClockRateHz = 25000000;
spi_cfg.DataBits = SSP_16BITS;
spi_cfg.*** = SSP_HIGH_IDLE;
spi_cfg.*** = SSP_XFR_2ND_CLK_EDGE;
spi_cfg.SPIDuplex = SSP_FULLDUPLEX;
spi_cfg.ChipSelect = SSP_CS0;
spi_cfg.AssertDelay = 0;
spi_cfg.DeAssertDelay = 0;
spi_cfg.InterWordDelay = 0;
SSP_InitConfigData(SSP_PORT1, SSP_CS0, &spi_cfg);

}

//————————————————————-
// C787 Register read access
//————————————————————-
unsigned int read_C787( int ad )
{
int bank, addr, nbyte, wbyte, rbytes;
unsigned int dt;
uint16 rdt, bdt, wdt, rdbuf;
int08 rc1, rc2, rd1byte;
uint16 wbuf;
uint08 rbuff[4];
uint32 wtimeout, rtimeout, sizewritten, sizereaded;
uint32 outclk;

dt = 0;

bank = ( ad >> 16 ) & 0xff;
addr = ( ad >> 8 ) & 0xff;
nbyte = ad & 0xff;

SSP_ReservePortSemaphore(SSP_PORT1, 10);
if ( bank != g_current_bank ) {
g_current_bank = bank;
bdt = ((((0x00 | 0x80) << 8) & 0xff00) | (bank & 0xff));
rc1 = SSP_PolledWrite(SSP_PORT1, SSP_CS0, 2, &bdt, 100, &sizewritten);
// dbmsg_ftrace(DBM_C787, "SSP_PolledWrite addr = %06x, rc = %d, wbyte = %d\r\n", addr, rc1, sizewritten);
}

while ( nbyte > 0 ) {
nbyte–;
dt = ( dt << 8 );
wbuf = (0x00 << 8) | ((addr + nbyte) & 0x7f);
rc2 = SSP_PolledWriteRead(SSP_PORT1, SSP_CS0, 2, &wbuf, 100, &sizewritten, 1, (uint16*)&rd1byte, 100, &sizereaded);
dt = dt + rd1byte;
}

SSP_ReleasePortSemaphore(SSP_PORT1);

return dt;

}

//————————————————————-
// C787 Register write access
//————————————————————-
void write_C787( int ad, unsigned int dt, int bk_offset, int force )
{
int bank, addr, nbyte;
uint16 bdt, wdata;
uint32 wbyte;
int08 rc1, rc2;

//————————————————————-
bank = (ad >> 16) & 0xff;
addr = (ad >> 8) & 0xff;
nbyte = ad & 0xff;

bank += bk_offset;
//————————————————————-
SSP_ReservePortSemaphore(SSP_PORT1, 10);
if ( bank != g_current_bank ) {
g_current_bank = bank;
bdt = ((((0x00 | 0x80) << 8) & 0xff00) | (bank & 0xff));
rc1 = SSP_PolledWrite(SSP_PORT1, SSP_CS0, 2, &bdt, 100, &wbyte);
}
//————————————————————-
while ( nbyte > 0 ) {
wdata = ((((addr | 0x80) << 8) & 0xff00) | (dt & 0xff));
rc2 = SSP_PolledWrite(SSP_PORT1, SSP_CS0, 2, &wdata, 100, &wbyte);
addr++;
dt = ( dt >> 8 );
nbyte–;
}

SSP_ReleasePortSemaphore(SSP_PORT1);

}