STM32F4学习笔记之SPI(使用固件库-非中断方式)

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE) for SPI1

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE) for SPI2

RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE) for SPI3.

2.使能对应GPIO的时钟

RCC_AHB1PeriphClockCmd() function. (SCK, MOSI, MISO and NSS ).

3.配置对应引脚的复用功能

GPIO_PinAFConfig(GPIOx, GPIO_PinSourcex, GPIO_AF_SPIx); //引脚映射

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 设置为推挽输出

GPIO_InitStructure.GPIO_Mode //复用模式

= GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Pin //引脚选择

= GPIO_Pin_x ;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_xxMHz;

//速度选择

GPIO_Init(GPIOx, //写入配置信息

&GPIO_InitStructure);

4.配置SPI信息

SPI_InitStructure.SPI_Direction = xxx;//工作模式

SPI_Direction_2Lines_FullDuplex，SPI_Direction_2Lines_RxOnly等

SPI_InitStructure.SPI_Mode = xxx; //主从模式选择SPI_Mode_Master，SPI_Mode_Slave

SPI_InitStructure.SPI_DataSize = xxx;//数据位选择SPI_DataSize_8b，SPI_DataSize_16b

SPI_InitStructure.SPI_CPOL = xxx;//时钟空闲电平选择SPI_CPOL_High，SPI_CPOL_Low

SPI_InitStructure.SPI_CPHA = xxx;//数据捕捉跳变沿选择SPI_CPHA_2Edge，SPI_CPHA_1Edge

SPI_InitStructure.SPI_NSS = xxx;//NSS信号由硬件还是软件控制SPI_NSS_Soft，SPI_NSS_Hard

SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_x;//时钟

分频选择

SPI_InitStructure.SPI_FirstBit SPI_FirstBit_MSB,SPI_FirstBit_LSB

= xxx;//数据大小端选择

SPI_InitStructure.SPI_CRCPolynomial = 7;//CRC值计算的多项式

SPI_Init(SPI1, &SPI_InitStructure);//写入配置信息

5.发送

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData(SPI1,u8 xxx);

6.接收

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

SPI_I2S_ReceiveData(SPI1);

程序举例：

本例是对交换机芯片KSZ8873的配置

宏定义：

#define KSZ8873_SPI SPI1

#define KSZ8873_SPI_CLK RCC_APB2Periph_SPI1

#define KSZ8873_SPI_SCK_PIN GPIO_Pin_3

#define KSZ8873_SPI_SCK_GPIO_PORT #define KSZ8873_SPI_SCK_GPIO_CLK #define KSZ8873_SPI_SCK_SOURCE #define KSZ8873_SPI_MISO_PIN #define KSZ8873_SPI_MISO_GPIO_PORT #define KSZ8873_SPI_MISO_GPIO_CLK #define KSZ8873_SPI_MISO_SOURCE #define KSZ8873_SPI_MOSI_PIN #define KSZ8873_SPI_MOSI_GPIO_PORT #define KSZ8873_SPI_MOSI_GPIO_CLK GPIOB RCC_AHB1Periph_GPIOB

GPIO_PinSource3

GPIO_Pin_4

GPIOB RCC_AHB1Periph_GPIOB

GPIO_PinSource4

GPIO_Pin_5

GPIOB RCC_AHB1Periph_GPIOB

#define KSZ8873_SPI_MOSI_SOURCE GPIO_PinSource5

#define KSZ8873_CS_PIN GPIO_Pin_15

#define KSZ8873_CS_GPIO_PORT GPIOA

#define KSZ8873_CS_GPIO_CLK RCC_AHB1Periph_GPIOA

#define KSZ8873_CS_LOW() GPIO_ResetBits(KSZ8873_CS_GPIO_PORT, KSZ8873_CS_PIN)

#define KSZ8873_CS_HIGH() GPIO_SetBits(KSZ8873_CS_GPIO_PORT, KSZ8873_CS_PIN)

#define KSZ8873_WRITE_CMD 0x02

#define KSZ8873_READ_CMD 0x03

程序：

void KSZ8873_SPI_Init(void)

{

SPI_InitTypeDef SPI_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(KSZ8873_CS_GPIO_CLK, ENABLE);

GPIO_InitStructure.GPIO_Pin = KSZ8873_CS_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(KSZ8873_CS_GPIO_PORT, &GPIO_InitStructure);

RCC_AHB1PeriphClockCmd(KSZ8873_SPI_SCK_GPIO_CLK KSZ8873_SPI_MISO_GPIO_CLK |

|

KSZ8873_SPI_MOSI_GPIO_CLK, ENABLE);

RCC_APB2PeriphClockCmd(KSZ8873_SPI_CLK, ENABLE);

GPIO_PinAFConfig(KSZ8873_SPI_SCK_GPIO_PORT, KSZ8873_SPI_SCK_SOURCE, GPIO_AF_SPI1);

GPIO_PinAFConfig(KSZ8873_SPI_MISO_GPIO_PORT, KSZ8873_SPI_MISO_SOURCE, GPIO_AF_SPI1);

GPIO_PinAFConfig(KSZ8873_SPI_MOSI_GPIO_PORT, KSZ8873_SPI_MOSI_SOURCE, GPIO_AF_SPI1);

GPIO_InitStructure.GPIO_Pin = KSZ8873_SPI_SCK_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(KSZ8873_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = KSZ8873_SPI_MISO_PIN;

GPIO_Init(KSZ8873_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = KSZ8873_SPI_MOSI_PIN;

GPIO_Init(KSZ8873_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);

KSZ8873_CS_HIGH();

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 = SPI_BaudRatePrescaler_4;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_Init( KSZ8873_SPI , &SPI_InitStructure);

SPI_Cmd(SPI1, ENABLE);

}

void KSZ8873_SPI_SendByte(u8 addr,u8 byte)

{

KSZ8873_CS_LOW();

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData( KSZ8873_SPI , KSZ8873_WRITE_CMD);

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

SPI_I2S_ReceiveData( KSZ8873_SPI );

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData( KSZ8873_SPI , addr);

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

SPI_I2S_ReceiveData( KSZ8873_SPI );

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData(SPI1, byte);

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_RXNE) == RESET);

SPI_I2S_ReceiveData( KSZ8873_SPI );

KSZ8873_CS_HIGH();

}

u8 KSZ8873_SPI_ReceiveByte(u8 byte)

{

u8 i;

KSZ8873_CS_LOW();

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData(SPI1, KSZ8873_READ_CMD);

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_RXNE) == RESET);

SPI_I2S_ReceiveData(SPI1);

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData(SPI1, byte);

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_RXNE) == RESET);

SPI_I2S_ReceiveData(SPI1);

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_TXE) == RESET);

SPI_I2S_SendData(SPI1, byte);

while (SPI_I2S_GetFlagStatus( KSZ8873_SPI , SPI_I2S_FLAG_RXNE) RESET);

i=SPI_I2S_ReceiveData(SPI1);

KSZ8873_CS_HIGH();

return i;

}

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