Part Number: ADS127L01 Hello, I would like to able to synchronize when to read the ADC data using the SPI command. I am working with the following setting: - START pin connected to ground permanently - HR= 1, FORMAT= 0, OSR0= 1, OSR1= 1, FSMODE=0, FILTER0= 0, FILTER1= 1 - CLK= 8MHz The problem is that I can not get any data from the DOUT pin (LOW all the time). I am reading the SPI data with an STM32F4 Discovery board. Below is the code excerpt (some of the details are omitted for the sake of brevity). int main(void) { cmd_data = 6; // RESET command (according to the datasheet 8.5.1.8 SPI Commands) HAL_SPI_Transmit(&hspi2, &cmd_data, 1, 1); // transmit 1 byte of data HAL_Delay(100); // delay for 100 ms cmd_data = 8; // START command HAL_SPI_Transmit(&hspi2, &cmd_data, 1, 1); while (1) { cmd_data = 18; // RDATA commmand HAL_SPI_Transmit(&hspi2, &cmd_data, 1, 1); HAL_Delay(1); // delay 1 ms to allow the data to be reloaded to the output shift register HAL_SPI_Receive(&hspi2, &meas_data_1, 1, 1); // receive 1 byte of data HAL_SPI_Receive(&hspi2, &meas_data_2, 1, 1); HAL_SPI_Receive(&hspi2, &meas_data_3, 1, 1); } } I also noticed that the DRDY pin never changes state (always HIGH) when I permanently grounded the START pin, is this behavior normal? Could you kindly point out where I made a mistake? Thank you in advance Kind regards, Yudha
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