STM32F103 Hardware NSS solution

proc9 · ‎2015-08-28

Posted on August 29, 2015 at 00:01

Hello.

I'm having problems with STM32F103 SPI peripheral. On STM32F072 I could have proper transmission with hardware NSS management, but on STM32F103 it is just pulled low and it stays like that.

Is there any solution for that?

stm32forum · ‎2015-08-29

Posted on August 29, 2015 at 21:07

Maybe you can shine a light on what spi port your using, maybe some used pins and preferably some code snips.

proc9 · ‎2015-08-29

Posted on August 30, 2015 at 00:42

Of course. I'm using SPI1 and its PA4 PA5 PA6 and PA7.

I'm initializing SPI with that code:

RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;

SPI1->CR2 = SPI_CR2_SSOE;

SPI1->CR1 = SPI_CR1_MSTR | SPI_CR1_BR_2 | SPI_CR1_SSI | SPI_CR1_SPE;