STM32F407 两个SPI互相通信，SPI1与SPI2通信实验

c2z3a5r7 · 发表于 2018-7-17 01:26:16

经过几天探索、查找甄别网上别人的代码，终于达成可以在一块STM32F4芯片上用SPI1与SPI2通信的功能，spi做主，spi2做从，连线方式为：PA4 ---- PB12 (NSS) , PA5 ---- PB13 (SCK), PA6 ---- PB14（MISO）,  PA7 ---- PB15 （MOSI）

SPI1部分：
void init_SPI1(){
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = (1U << 5) |  (1U << 6) | (1U << 7) ;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA,5,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,6,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,7,GPIO_AF_SPI1);

uint16_t tempreg = 0;
SPI_DeInit(SPI1);

tempreg = SPI1->CR1;
tempreg &= 0x3040;
tempreg |= (uint16_t)((uint32_t)SPI_Direction_2Lines_FullDuplex | SPI_Mode_Master |
SPI_DataSize_8b | SPI_CPOL_High |
SPI_CPHA_2Edge| SPI_NSS_Soft |
SPI_BaudRatePrescaler_4 | SPI_FirstBit_MSB);
SPI1->CR1 = tempreg;
SPI1->I2SCFGR &= (uint16_t)~((uint16_t)SPI_I2SCFGR_I2SMOD);
SPI1->CRCPR = 7;
SPI1->CR1 |= SPI_CR1_SPE;

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = (1U << 4) ;//用的是PA4，实际情况可随意用其它未复用的IO
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIOA->BSRRL |= (1U << 4); //PA4 写高电平
}

SPI2部分：
void init_SPI2(){

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = (1U << 13) |  (1U << 14) | (1U <<15) ;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOB,13,GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB,14,GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB,15,GPIO_AF_SPI2);

uint16_t tempreg = 0;
SPI_DeInit(SPI2);

tempreg = SPI2->CR1;
tempreg &= 0x3040;
tempreg |= (uint16_t)((uint32_t)SPI_Direction_2Lines_FullDuplex | SPI_Mode_Master |
SPI_DataSize_8b | SPI_CPOL_High |
SPI_CPHA_2Edge| SPI_NSS_Soft |
SPI_BaudRatePrescaler_4 | SPI_FirstBit_MSB);
SPI2->CR1 = tempreg;
SPI2->I2SCFGR &= (uint16_t)~((uint16_t)SPI_I2SCFGR_I2SMOD);
SPI2->CRCPR = 7;
SPI2->CR1 |= SPI_CR1_SPE;

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = (1U << 12) ;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_Init(GPIOB, &GPIO_InitStructure);

}

传输函数部分，SPIx可以是SPI1或SPI2
u8 SPIx_transferByte(u8 data){
u8 retry=0;
while((SPIx->SR & SPI_I2S_FLAG_TXE)==0 && retry <= 0xFF)
{
retry++;
}
SPIx->DR = data;
retry=0;
while((SPIx->SR & SPI_I2S_FLAG_RXNE)==0 && retry <= 0xFF)
{
retry++;
}

return (SPIx->DR & 0x00FF);
}

主函数部分
int main(){
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB,ENABLE);

init_SPI1();
init_SPI2();
u16 data1 =0,data2=0;
  while(1){
         GPIOA->BSRRH |= (1U << 4); //PA4 写低电平
         data1  = SPIx_transferByte(0x11);
         data2= SPIx_transferByte(0x22);
      GPIOA->BSRRL |= (1U << 4); //PA4 写高电平
      delay(10);//wait 0.01s
  }
}

c2z3a5r7 · 发表于 2021-8-26 14:27:19

天海戈林发表于 2021-8-16 11:37
你这调通了一次，就各种论坛发帖，你累不累

关你卵事

lslll · 发表于 2018-9-29 08:45:58

楼主，请问下两个spi的nss必须要连上么？只用sck，mosi和miso不行么

c2z3a5r7 · 发表于 2018-12-18 22:47:21

不必须连接

c2z3a5r7 · 发表于 2018-12-18 22:48:03

lslll 发表于 2018-9-29 08:45
楼主，请问下两个spi的nss必须要连上么？只用sck，mosi和miso不行么

不用必须连接

walker_he · 发表于 2018-12-18 22:52:56

原子哥提供的例程不能自环通讯吗，虽然我没有测试过。

yt2000 · 发表于 2019-1-1 22:12:53

本帖最后由 yt2000 于 2019-1-1 22:15 编辑

STM32F103用SPI1的16位从模式发送数据,另一个STM32F103的SPI1是主模式,每次16bit没问题,但如果是32bit,2个16bit的间隔是1us,主模式的STM32收到的数据就是乱的,STM32不能进行32bit传输?还是说2次16bit的间隔太短?用的是16bit的DMA模式,2个16bit数据间的间隔有什么要求吗?手册上也没有这些技术参数