Need help in improving SPI speed.

[Vicky-S]

I have 38.4KSPS ADC(ADS1262) which have SPI interface. I'm trying to read the 38K samples in STM32F103C8t6. I need to send one byte command to get 4 bytes of data. So 5 bytes of data need to be transferred for each sample. Irrespective of SPI speed I can able to get max of 19K samples. I have tried to increase the SPI speed using clock divider function but the result is same.

For Single sample it took 45 micro seconds. but I need to get one sample with in 38us to get 38K samples. Initially my clock divider value was 16 then I increased it up to 2 but the time taken was same as 45us. How can it be?? Irrespective of clock speed the loop time remains same which is weird.

Is there a way to increase the speed of STM32F1? I can able to get 19k samples with 16MHz Arduino UNO but 72MHz STM32F1 gives the same output.

[fpistm]

Right, linked to #257
Other improvement is to use DMA.
Have you tried SPI_CONTINUE for CS?
https://github.com/stm32duino/wiki/wiki/API#spi

[Vicky-S]

Yep. I tried but it takes more time than usual for me.

And im using only one device now so im keeping my CS pin to low for all the time.

[fpistm]

Close this one to track all SPI request on the same issue #257.
Mark it as duplicated.