Part Number: ADS1120
1. reg configre : uiADS1120_WrBuff[4] = { 0x08, 0xC1, 0xC5, 0x80}; circuit is figure 79 in datasheet.
2. my code as follow:
int ADS1220ReadData(void)//TFQ改
{
int Data;
u8 TempData;
/* assert CS to start transfer */
ADS1220AssertCS(1);
Delay_us(20); // 之前是10us
/* send the command byte */
TempData = SPI2_ReadWriteByte(ADS1220_CMD_RDATA);
/* get the conversion result */
// ADS1120
Data = SPI2_ReadWriteByte(0xff);
Data = (Data << 8) | SPI2_ReadWriteByte(0xff);
/* sign extend data */
if (Data & 0x8000)
Data |= 0xffff0000;
Delay_us(20); //houjia
/* de-assert CS */
ADS1220AssertCS(0);
return Data;
}
3. read reg value is equal write value. but,when i modified the reg0 0xe8, the adcputput is not near zero, it's a 1300.
connect sensor, the ADC value is 2103, when change the sensor state, the adc value is changed .it looks like plus a offset in the input port.