cubmax spi通信 及代码

Cubmax是一家电子元器件供应商，提供了多种SPI通信相关的芯片和模块。以下是一个基于STM32的SPI通信的示例代码，使用了Cubmax提供的SPI模块：

#include "stm32f10x.h"
#include "cubmax_spi.h"

void InitSPI(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;  // SCK and MOSI pins
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; // MISO pin
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; // CS pin
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    SPI_InitTypeDef SPI_InitStructure;
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);
}

void CS_LOW(void)
{
    GPIO_ResetBits(GPIOA, GPIO_Pin_4);
}

void CS_HIGH(void)
{
    GPIO_SetBits(GPIOA, GPIO_Pin_4);
}

void SPI_Send(uint8_t data)
{
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    SPI_I2S_SendData(SPI1, data);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    SPI_I2S_ReceiveData(SPI1);
}

void SPI_Read(uint8_t* buffer, uint8_t length)
{
    for (uint8_t i = 0; i < length; i++)
    {
        SPI_Send(0xFF);
        buffer[i] = SPI_Send(0xFF);
    }
}

void SPI_Write(uint8_t* data, uint8_t length)
{
    for (uint8_t i = 0; i < length; i++)
    {
        SPI_Send(data[i]);
    }
}

int main(void)
{
    InitSPI();

    uint8_t data[10] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A};
    CS_LOW();
    SPI_Write(data, 10);
    CS_HIGH();

    return 0;
}

在这个示例代码中，我们使用了STM32的SPI1模块，通过GPIOA的5、6、7号引脚连接了SPI的SCK、MISO和MOSI引脚，同时使用GPIOA的4号引脚作为片选信号（CS）。在主函数中，我们首先初始化了SPI模块和GPIO引脚，并且通过CS_LOW()和CS_HIGH()函数控制了片选信号。我们还定义了SPI_Send()、SPI_Read()和SPI_Write()三个函数来实现SPI通信的发送和接收功能。在主函数中，我们通过SPI_Write()函数将10个字节的数据发送出去。