硬件：Mosi-mosi miso-miso sck-sck
从机：
u8 SPI1_Buffer_Tx[BufferSize] =
{ 0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE
};
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
SPI_Configuration();
GPIO_ResetBits(GPIOC,GPIO_Pin_3);
// GPIO_ResetBits(GPIOA, GPIO_Pin_4);
printf("OK,I'm Slave \r\n");
while(Tx_Counter < BufferSize)
{
while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);
SPI_I2S_SendData(SPI1,SPI1_Buffer_Tx[Tx_Counter]);
while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE) ==RESET);
SPI1_Buffer_Rx[Rx_Counter] = SPI_I2S_ReceiveData(SPI1);
Tx_Counter++;
Rx_Counter++;
}
printf("\r\n The SPI1 has sended data below : \r\n");
k=0;
while(k<BufferSize)
{
printf(" %0.2d \r ",SPI1_Buffer_Tx[k]);
k++;
}
printf("\r\n The SPI1 has received data below : \r\n");
k=0;
while(k<BufferSize)
{
printf(" %0.2d \r ",SPI1_Buffer_Rx[k]);
k++;
}
}
void SPI_Configuration(void)
{
SPI1_conf();
// SPI2_conf();
}
void SPI1_conf(void)
{
SPI_InitTypeDef SPI_InitStructure;
SPI_Cmd(SPI1, DISABLE);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
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_LSB;//SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/*Enable SPI1.NSS as a GPIO*/
//SPI_SSOutputCmd(SPI1, ENABLE);
// NVIC_SPI_Config(); //启动NVIC
// SPI_I2S_ITConfig(SPI1,SPI_I2S_IT_RXNE,ENABLE);
SPI_Cmd(SPI1, ENABLE);
SPI_I2S_ClearITPendingBit(SPI1, SPI_I2S_IT_RXNE);
// spi1_cs_low;
}
void NVIC_SPI_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void GPIO_Configuration(void)
{
GPIO_Configuration_Slave();
GPIO_Configuration_Utra1();
LED_GPIO_Config();
}
void LED_GPIO_Config(void)
{
/*定义一个GPIO_InitTypeDef类型的结构体*/
GPIO_InitTypeDef GPIO_InitStructure;
/*开启GPIOC的外设时钟*/
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOC, ENABLE);
/*选择要控制的GPIOC引脚*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
/*设置引脚模式为通用推挽输出*/
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
/*设置引脚速率为50MHz */
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
/*调用库函数，初始化GPIOC*/
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* 关闭所有led灯 */
GPIO_SetBits(GPIOC, GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5);
}
void GPIO_Configuration_Slave(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_7; //CS SCK MOSI 从机
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA , &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //miso
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA , &GPIO_InitStructure);
}
void GPIO_Configuration_Utra1(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA , &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA , &GPIO_InitStructure);
}
void RCC_Configuration(void)
{
/* 定义枚举类型变量 HSEStartUpStatus */
ErrorStatus HSEStartUpStatus;
/* 复位系统时钟设置*/
RCC_DeInit();
/* 开启HSE*/
RCC_HSEConfig(RCC_HSE_ON);
/* 等待HSE起振并稳定*/
HSEStartUpStatus = RCC_WaitForHSEStartUp();
/* 判断HSE起是否振成功，是则进入if()内部 */
if(HSEStartUpStatus == SUCCESS)
{
/* 选择HCLK（AHB）时钟源为SYSCLK 1分频 */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* 选择PCLK2时钟源为 HCLK（AHB） 1分频 */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* 选择PCLK1时钟源为 HCLK（AHB） 2分频 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* 设置FLASH延时周期数为2 */
FLASH_SetLatency(FLASH_Latency_2);
/* 使能FLASH预取缓存 */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* 选择锁相环（PLL）时钟源为HSE 1分频，倍频数为9，则PLL输出频率为 8MHz * 9 = 72MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* 使能PLL */
RCC_PLLCmd(ENABLE);
/* 等待PLL输出稳定 */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
/* 选择SYSCLK时钟源为PLL */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* 等待PLL成为SYSCLK时钟源 */
while(RCC_GetSYSCLKSource() != 0x08);
}
/* 打开APB2总线上的GPIOA时钟*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_USART1|RCC_APB2Periph_SPI1|RCC_APB2Periph_GPIOE, ENABLE);
//RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR|RCC_APB1Periph_BKP|RCC_APB1Periph_WWDG, ENABLE);
}
主机：
void SPI1_conf(void)
{
SPI_InitTypeDef SPI_InitStructure;
SPI_Cmd(SPI1, DISABLE);
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_CPOL_LOW
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_LSB;//SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/*Enable SPI1.NSS as a GPIO*/
//SPI_SSOutputCmd(SPI1, ENABLE);
SPI_Cmd(SPI1, ENABLE);
SPI_I2S_ClearITPendingBit(SPI1, SPI_I2S_IT_RXNE);
// spi1_cs_low;
}
main
{
while(1)
{
while(1)
{
if(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_5) == 0)
{
while(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_5)==0);
break;
}
}
Tx_Counter=0;
Rx_Counter=0;
while(Tx_Counter < BufferSize)
{
while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);
SPI_I2S_SendData(SPI1,SPI1_Buffer_Tx[Tx_Counter]);
// delay();
while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE) ==RESET);
SPI1_Buffer_Rx[Rx_Counter] = SPI_I2S_ReceiveData(SPI1);
Tx_Counter++;
Rx_Counter++;
}
printf("\r\n The SPI1 has sended data below : \r\n");
k=0;
while(k<BufferSize)
{
printf(" %0.2d \r ",SPI1_Buffer_Tx[k]);
k++;
}
printf("\r\n The SPI1 has received data below : \r\n");
k=0;
while(k<BufferSize)
{
printf(" %0.2d \r ",SPI1_Buffer_Rx[k]);
k++;
}
}
}
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