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器件型号：ADS124S08 主题中讨论的其他器件：MSPM0G3507、
您好
我正在使用 mspm0g3507从 ads124s08 ADC 读取数据。 但我得到的价值不符合预期。 我已经根据 DSO 进行了检查、所有波形都正确无误、如数据表所示。 我将附加波形文件、同时还有代码让我知道我哪里做错了。
int main(void)
{
SYSCFG_DL_init(); // init all gpio and spi with spi mode 1
delay_cycles(70400); //wait for POST operation
delay_cycles(32000); //required min 20ns we provide 1ms delay
delay_cycles(160000); // delay of min of 4096*tclk
readRegs( ID_ADDR_MASK,19,Data); //reading default setting
ADS124S08_Init(); // configuring adc
readRegs_after( ID_ADDR_MASK,19,Data); //readbck new configuration
DL_GPIO_setPins(GPIO_LEDS_START_PORT,GPIO_LEDS_START_PIN); // pull start pin high to start convertion
delay_cycles(224000);
while(1)
{
if (!DL_GPIO_readPins(GPIO_LEDS_DRDY_ADC_PORT, GPIO_LEDS_DRDY_ADC_PIN)) // check of low transition of DRDY pin
{
DL_SPI_transmitData8(SPI_0_INST,RDATA_OPCODE_MASK);
delay_cycles(32000);
iData.adcValue1 = dataRead(&dStatus, &dData, &dCRC);
}
RTDRes = CodeToRes(&iData);
RTDTemp = calculateTemperature(RTDRes);
}
}
数据读取
uint32_t dataRead(uint32_t *dStatus, uint32_t *dData, uint32_t *dCRC)
{
uint32_t xcrc;
uint32_t xstatus;
uint32_t iData;
uint32_t Data_t;
DL_GPIO_clearPins(GPIO_LEDS_CS0_PORT,GPIO_LEDS_CS0_PIN);
if((registers_after[SYS_ADDR_MASK] & 0x01) == DATA_MODE_STATUS)
{
xstatus = xferWord(0x00);
dStatus[0] = (uint8_t)xstatus;
}
// get the conversion data
iData = xferWord(0x00);
iData = (iData<<8) + xferWord(0x00);
iData = (iData<<8) + xferWord(0x00);
if((registers_after[SYS_ADDR_MASK] & 0x02) == DATA_MODE_CRC)
{
xcrc = xferWord(0x00);
dCRC[0] = (uint8_t)xcrc;
}
DL_GPIO_setPins(GPIO_LEDS_CS0_PORT,GPIO_LEDS_CS0_PIN);
Data_t = iData;
return iData ;
}
传递函数：
uint32_t xferWord(uint32_t tx)
{
uint32_t rx;
/* Set up data for the next xmit */
DL_SPI_transmitData32(SPI_0_INST,tx);
/* Wait for data to appear */
while(DL_SPI_isBusy(SPI_0_INST));
rx= DL_SPI_receiveDataBlocking32(SPI_0_INST);
// rx= DL_SPI_receiveDataBlocking32(SPI_0_INST);
// rx= DL_SPI_receiveData32(SPI_0_INST);
return rx;
}
波形：
