#include "stm32f10x.h"


/* RCC時鐘配置 */
void RCC_config(void)
{?
ErrorStatus HSEStartUpStatus;


/* RCC寄存器設(shè)置為默認(rèn)配置 */
RCC_DeInit();
/* 打開外部高速時鐘 */
RCC_HSEConfig(RCC_HSE_ON);
/* 等待外部高速時鐘穩(wěn)定 */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)?
{?
/* 設(shè)置HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* 設(shè)置PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* 設(shè)置PCLK1 = HCLK / 2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
// /* 設(shè)置FLASH代碼延時 */
// FLASH_SetLatency(FLASH_Latency_2);
// /* 使能預(yù)取址緩存 */
// FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* 設(shè)置PLL時鐘源為HSE倍頻9 72MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* 使能PLL */
RCC_PLLCmd(ENABLE);
/* 等待PLL穩(wěn)定 */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
/* 設(shè)置PLL為系統(tǒng)時鐘源 */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* 等待系統(tǒng)時鐘源切換到PLL */
while(RCC_GetSYSCLKSource() != 0x08);
}
}


/* GPIO配置 */
void GPIO_config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;


/* 時鐘配置 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);


/* MISO配置為復(fù)用推挽輸出 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* SCK和MOSI配置為浮空輸入 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* NSS配置為浮空輸入 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}


/* SPI配置 */
void SPI_config(void)
{
SPI_InitTypeDef SPI_InitStructure;

/* 時鐘配置 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_SPI1, ENABLE);

/* 配置SPI模式 */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_RxOnly;
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_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

/* 打開接收中斷 */
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);?

/* 打開SPI1 */
SPI_Cmd(SPI1, ENABLE);
}


/* 中斷嵌套控制器配置 */
void NVIC_config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

/* 選擇中斷分組2 */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);


/* 設(shè)置SPI1中斷 */
NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}


/* 毫秒延時函數(shù) */
void delay_ms(uint16_t time)
{? ??
uint16_t i = 0;??


while(time--)
{
i = 12000;
while(i--);? ??
}
}


/* 主函數(shù) */
int main(void)
{
/* RCC時鐘配置 */
RCC_config();

/* GPIO配置 */
GPIO_config();


/* 中斷嵌套控制器配置 */
NVIC_config();

/* SPI配置 */
SPI_config();

while(1)
{
delay_ms(1000);
}
}


void SPI1_IRQHandler(void)?
{
volatile uint8_t i;

/* 接收中斷 */
if(SPI_I2S_GetITStatus(SPI1, SPI_I2S_IT_RXNE) == SET)
{
/* 接收到數(shù)據(jù) */
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
i = SPI_I2S_ReceiveData(SPI1);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, i);

/* 清除接收中斷 */
SPI_I2S_ClearITPendingBit(SPI1, SPI_I2S_IT_RXNE);
}
}

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