BF8920A SPI通信例程
时间: 2023-10-18 10:06:15 浏览: 90
以下是基于STM32的BF8920A芯片的SPI通信例程,供您参考:
```c
#include "bsp_spi.h"
#include "bsp_delay.h"
//初始化SPI接口
void SPIx_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
//打开SPI时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
//打开GPIOA时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
//配置SPI1_MOSI、SPI1_MISO、SPI1_SCK
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_6 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//将PA5、PA6、PA7引脚复用到 SPI1
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
//SPI1初始化结构体配置
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //SPI双线双向全双工模式
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //主模式
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //数据大小为8位
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //时钟极性为高
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //时钟相位为第二个边沿
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS软件管理
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2; //预分频值为2,SPI时钟为84MHz/2=42MHz
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //数据发送时最高位先发送
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC多项式计算初始值为7
//初始化SPI1
SPI_Init(SPI1, &SPI_InitStructure);
//使能SPI1
SPI_Cmd(SPI1, ENABLE);
}
//SPI发送1个字节数据
uint8_t SPIx_WriteByte(uint8_t data)
{
//等待发送区空
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
;
//通过外设SPIx发送一个字节数据
SPI_I2S_SendData(SPI1, data);
//等待接收区非空
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
;
//返回通过SPIx最近接收的数据
return SPI_I2S_ReceiveData(SPI1);
}
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