ADS131E08: SPI_DOUT have no data output

Hi Chen Lin,

A month or so ago you were using the ADS131E08EVM-PDK. Were you getting proper DOUT at that time? Have you gotten your own board back now and experiencing this problem with new hardware? Can you provide a schematic and details on how you are configuring the device?

1、Cpu comfigure four wire SPI,  cpu can  read ads131e08  id register；

2、Cpu comfigure three wire SPI,   CS of ads131e08  connect GND ，DOUT of  ads131e08 have no data output ，at the moment ， CLK and RX of can ads131e08 received  signals from CPU。

static int ads131e08_init(struct ads131e08 *ads131e08)

{
int ret = 0,i = 0;
u8 buf = 0;

ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_SDATAC, 0, 0);
ret = ads131e08_sendreset(ads131e08);
if(ret){
dev_err(ads131e08->dev, " write reset error\n");
return ret;
}
ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_WAKEUP, 0, 0);

ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_SDATAC, 0, 0);
if(ret){
dev_err(ads131e08->dev, " write sdatac error\n");
return ret;
}
usleep_range(2,3);
ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_STOP, 0, 0);

ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_WREG,
ADS131E08_CFG1, (void *)&reg_init.cfg1);

usleep_range(2,3);
ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_WREG,
ADS131E08_CFG2,(void *)&reg_init.cfg2);

usleep_range(2,3);
ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_WREG,
ADS131E08_CFG3, (void *)&reg_init.cfg3);

usleep_range(2,3);
for(i = 0; i < 8; i++){
ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_WREG,
ADS131E08_CH1SET+i, (void *)&reg_init.chnset);
if(ret){
dev_err(ads131e08->dev, " init CH%dSET error\n",i+1);
return ret;
}
}

usleep_range(2,3);
ret = ads131e08_cmd_control(ads131e08, ADS131E08_CMD_RREG,
ADS131E08_ID, (void *)&buf);
if(ret < 0){
dev_err(ads131e08->dev, " read id register error\n");
return ret;
}else{
dev_info(ads131e08->dev, " devid is = 0x%2.2x\n",buf);
if(buf == 0){
return -1;
}
}

ads131e08_reg_dump(ads131e08);

ret = gpio_direction_output(ads131e08->pdata->adc_start_gpio,1);
if (ret < 0) {
dev_err(ads131e08->dev,"fail to assert adc_start_gpio %d\n", ret);
return ret;
}

return ret;
}

Whether ads131e08 support three line SPI？