STM32F407的SPI主從機(jī)通信程序 - spi從機(jī)程序設(shè)計(jì)_spi從機(jī)程序代碼詳細(xì)介紹

void EXTIX_Init（）

{

NVIC_InitTypeDef NVIC_InitStructure;

EXTI_InitTypeDef EXTI_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd（RCC_APB2Periph_SYSCFG， ENABLE）;//使能SYSCFG時(shí)鐘

RCC_AHB1PeriphClockCmd（RCC_AHB1Periph_GPIOE， ENABLE）; //使能GPIOE時(shí)鐘

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//普通輸入模式

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100M

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//上拉

GPIO_Init（GPIOE， &GPIO_InitStructure）;//初始化GPIOE2，3，4，5

SYSCFG_EXTILineConfig（EXTI_PortSourceGPIOE， EXTI_PinSource2）;//PE2 連接到中斷線2

SYSCFG_EXTILineConfig（EXTI_PortSourceGPIOE， EXTI_PinSource3）;//PE3 連接到中斷線3

SYSCFG_EXTILineConfig（EXTI_PortSourceGPIOE， EXTI_PinSource4）;//PE4 連接到中斷線4

SYSCFG_EXTILineConfig（EXTI_PortSourceGPIOE， EXTI_PinSource5）;//PE5 連接到中斷線5

/* 配置EXTI_Line2，3，4 */

EXTI_InitStructure.EXTI_Line = EXTI_Line2 | EXTI_Line3 | EXTI_Line4 | EXTI_Line5;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中斷事件

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //下降沿觸發(fā)

EXTI_InitStructure.EXTI_LineCmd = ENABLE;//中斷線使能

EXTI_Init（&EXTI_InitStructure）;//配置

NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;//外部中斷2

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x03;//搶占優(yōu)先級(jí)3

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子優(yōu)先級(jí)2

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中斷通道

NVIC_Init（&NVIC_InitStructure）;//配置

NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;//外部中斷3

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;//搶占優(yōu)先級(jí)2

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子優(yōu)先級(jí)2

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中斷通道

NVIC_Init（&NVIC_InitStructure）;//配置

NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;//外部中斷4

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;//搶占優(yōu)先級(jí)1

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子優(yōu)先級(jí)2

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中斷通道

NVIC_Init（&NVIC_InitStructure）;//配置

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;//外部中斷4

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;//搶占優(yōu)先級(jí)1

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子優(yōu)先級(jí)2

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中斷通道

NVIC_Init（&NVIC_InitStructure）;//配置

}

int main（void）

{

NVIC_PriorityGroupConfig（NVIC_PriorityGroup_2）;//設(shè)置系統(tǒng)中斷優(yōu)先級(jí)分組2

delay_init（100）; //初始化延時(shí)函數(shù)

LED_Init（）; //初始化LED

CS_Init（）;

SPI1_Init（）;

SPI2_Init（）;

EXTIX_Init（）;

while（1）

{

CS2=1;

if（Flage&0x02）

{

Flage=Flage&0xfd;

CS3=1;

}

if（Flage&0x04）

{

Flage=Flage&0xfb;

SPI1_WriteByte（0xaa）;

SPI_Data［0］=SPI2_ReadByte（）;

SPI1_WriteByte（0xc3）;

SPI_Data［1］=SPI2_ReadByte（）;

SPI1_WriteByte（0x55）;

SPI_Data［2］=SPI2_ReadByte（）;

if（（SPI_Data［0］==0xaa）&&（SPI_Data［1］==0xc3）&&（SPI_Data［2］==0x55））

{

BEEP=~BEEP;

LED0=~LED0;

LED1=~LED1;

delay_ms（500）;

}

memset（SPI_Data，0，3）;

}

}

}