Posted on November 25, 2016 at 07:04Hi!
I have STM32F103C8 and want to configure SPI1!
I wrote the program
//spi1_mosi-pa7,spi1_miso-pa6,spi1_sck-pa5,spi1_nss-pa4
#include ''stm32f10x.h''
int main()
{
RCC->APB2ENR=RCC_APB2ENR_IOPAEN;
RCC->APB2ENR|=RCC_APB2ENR_AFIOEN;
RCC->APB2ENR|=RCC_APB2ENR_SPI1EN;
GPIOA->CRL|=GPIO_CRL_CNF7_1;//mosi
GPIOA->CRL|=GPIO_CRL_MODE7;
GPIOA->CRL|=GPIO_CRL_CNF6_1;//miso
GPIOA->CRL&=~GPIO_CRL_MODE6;
GPIOA->CRL|=GPIO_CRL_CNF5_1;//sck
GPIOA->CRL|=GPIO_CRL_MODE5;
GPIOA->CRL|=GPIO_CRL_CNF4_1;//miso
GPIOA->CRL&=~GPIO_CRL_MODE4;
SPI1->CR1=SPI_CR1_BR_0|SPI_CR1_BR_1|SPI_CR1_BR_2;
//SPI1->CR1=SPI_CR1_BIDIMODE;
//SPI1->CR1|=SPI_CR1_BIDIOE;
SPI1->CR1|=SPI_CR1_SSM;
SPI1->CR1|=SPI_CR1_SSI;
SPI1->CR1|=SPI_CR1_MSTR;
//SPI1->CR2=SPI_CR2_SSOE;
SPI1->CR1|=SPI_CR1_SPE;
while (1)
{
SPI1->DR=0x55;
while (!(SPI1->SR&SPI_SR_TXE));
}
There are no impulses on pins MOSI and SCK
What I did wrong?
Thank You!
