stm32 SPI Reading from AD7091R

[kalix3]

Hello friends,
We used the CN-0336 reference design for our analog input module design. There is AD7091R 12-bit ADC on this design. I searched the documents of the relevant design and tried to read the design that we made specifically for the time diagrams in the given contents, on the STM32 f030 nucleo board, but I could not succeed. I would like to ask those who can provide information and help on this matter to get back to me. My variables are

uint8_t spi_buf[2]={0,0};
uint16_t adc_value;
uint8_t i;
float volt=0;
float testdata[60];


code and design specs here ;

 

[Thundertronics.com]

There are many approaches to this problem.
Possible quick fix: you need to enable interrupts for some peripherals to make them work under HAL libraries (you can find interrupt checkbox in pinout editor/spi parameters). I do not remember if this the case for SPI though.
See if there anything on SPI lines using scope, check if SPI related functions return HAL_OK, etc. I would recommend to debug SPI without AD7091R first. Configure second SPI port on STM32, or use additional nucleo board with SPI. Make it work, and then proceed with external SPI ADC.

 

[KlausST]

Hi,

First you need to read the ADC datasheet acoording signals and timing.

Then you see that you need
* a falling edge of Convst
* Wait
* rising edge of convst
* wait
* falling edge of CS
* SPI transfer
* rising edge of CS
(For sure there are other approaches possible)

Then you nned to give a useful error description: "do not succeed" is not useful.

Klaus