qca7000 spi stm32通信例程

以下是QCA7000通过SPI接口与STM32通信的示例代码：

#include "stm32f10x.h"
#include "spi.h"
#include "qca7000.h"

#define QCA7000_SPI GPIOA
#define QCA7000_SPI_CS GPIO_Pin_4
#define QCA7000_SPI_SCK GPIO_Pin_5
#define QCA7000_SPI_MISO GPIO_Pin_6
#define QCA7000_SPI_MOSI GPIO_Pin_7

#define QCA7000_SPI_SPEED SPI_BaudRatePrescaler_8

void QCA7000_SPI_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = QCA7000_SPI_CS | QCA7000_SPI_SCK | QCA7000_SPI_MOSI;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(QCA7000_SPI, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = QCA7000_SPI_MISO;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(QCA7000_SPI, &GPIO_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_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = QCA7000_SPI_SPEED;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);
}

void QCA7000_SPI_CS_Enable(void)
{
    GPIO_ResetBits(QCA7000_SPI, QCA7000_SPI_CS);
}

void QCA7000_SPI_CS_Disable(void)
{
    GPIO_SetBits(QCA7000_SPI, QCA7000_SPI_CS);
}

uint8_t QCA7000_SPI_SendByte(uint8_t byte)
{
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    SPI_I2S_SendData(SPI1, byte);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    return SPI_I2S_ReceiveData(SPI1);
}

void QCA7000_SPI_SendPacket(uint8_t *data, uint16_t len)
{
    uint16_t i;
    for (i = 0; i < len; i++) {
        QCA7000_SPI_SendByte(data[i]);
    }
}

void QCA7000_SPI_RecvPacket(uint8_t *data, uint16_t len)
{
    uint16_t i;
    for (i = 0; i < len; i++) {
        data[i] = QCA7000_SPI_SendByte(0xFF);
    }
}

void QCA7000_SPI_TransferPacket(uint8_t *tx_data, uint8_t *rx_data, uint16_t len)
{
    uint16_t i;
    for (i = 0; i < len; i++) {
        rx_data[i] = QCA7000_SPI_SendByte(tx_data[i]);
    }
}

void QCA7000_SPI_Reset(void)
{
    QCA7000_SPI_CS_Enable();
    QCA7000_SPI_SendPacket((uint8_t *)"\x7E\x00\x08\x04\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 11);
    QCA7000_SPI_CS_Disable();
}

void QCA7000_SPI_InitDevice(void)
{
    QCA7000_SPI_Reset();
    //执行其他初始化操作
}

int main(void)
{
    uint8_t tx_data[8] = {0x7E, 0x00, 0x04, 0x08, 0x01, 0x00, 0x00, 0x00};
    uint8_t rx_data[8] = {0};

    QCA7000_SPI_Init();

    //初始化QCA7000设备
    QCA7000_SPI_InitDevice();

    //向QCA7000设备发送数据
    QCA7000_SPI_CS_Enable();
    QCA7000_SPI_SendPacket(tx_data, sizeof(tx_data));
    QCA7000_SPI_CS_Disable();

    //从QCA7000设备接收数据
    QCA7000_SPI_CS_Enable();
    QCA7000_SPI_RecvPacket(rx_data, sizeof(rx_data));
    QCA7000_SPI_CS_Disable();

    while (1);
}

在这个例子中，我们使用了STM32F103C8T6作为主控芯片，并通过SPI1接口与QCA7000进行通信。在初始化QCA7000之前，我们需要先初始化SPI接口。QCA7000_SPI_InitDevice()函数用于初始化QCA7000设备，我们在这里只是简单地发送了一个数据包。在发送和接收数据时，我们需要先使能CS引脚，然后通过QCA7000_SPI_SendPacket()和QCA7000_SPI_RecvPacket()函数来发送和接收数据。在发送和接收数据完成之后，我们需要将CS引脚禁用。