#include "stm32f10x.h"


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


/* RCC暫存器設定為預設配置 */
RCC_DeInit();
/* 開啟外部高速時鐘 */
RCC_HSEConfig(RCC_HSE_ON);
/* 等待外部高速時鐘穩定 */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS) 
{ 
/* 設定HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* 設定PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* 設定PCLK1 = HCLK / 2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
///* 設定FLASH程式碼延時 */
//FLASH_SetLatency(FLASH_Latency_2);
///* 使能預取址快取 */
//FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* 設定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穩定 */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
/* 設定PLL為系統時鐘源 */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* 等待系統時鐘源切換到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配置為複用推輓輸出 */
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_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_1Edge;
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(SPI1, &SPI_InitStructure);

/* 開啟SPI1 */
SPI_Cmd(SPI1, ENABLE);

/* 使能DMA接收 */
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
}


uint8_t rx_buf[100];


/* DMA配置 */
void DMA_config(void)
{
DMA_InitTypeDef DMA_InitStructure;


/* 使能DMA1時鐘 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

DMA_DeInit(DMA1_Channel2);  

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&SPI1->DR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)rx_buf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 100;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);


DMA_Cmd(DMA1_Channel2, ENABLE);
}


/* 中斷巢狀控制器配置 */
void NVIC_config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

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


/* 設定外部中斷4的先佔優先順序為3,從佔優先級為3 */
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}


/* 外部中斷配置 */
void EXIT_config(void)
{
EXTI_InitTypeDef EXTI_InitStructure;

/* 將GPIOA_0和中斷線連線 */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource4);

/* 設定中斷線0位外部下降沿中斷 */
EXTI_InitStructure.EXTI_Line = EXTI_Line4;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}


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


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


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

/* GPIO配置 */
GPIO_config();


/* 外部中斷配置 */
EXIT_config();

/* 中斷巢狀控制器配置 */
NVIC_config();

/* DMA配置 */
DMA_config();

/* SPI配置 */
SPI_config();

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


/* 外部中斷4 */
void EXTI4_IRQHandler(void)
{
volatile uint8_t len;

/* 檢查中斷狀態 */
if(EXTI_GetITStatus(EXTI_Line4) != RESET)  
{
len = 100 - DMA1_Channel2->CNDTR;

/* 接收完成，修改接收通道資料個數 */
DMA_Cmd(DMA1_Channel2, DISABLE);
DMA1_Channel2->CNDTR = 100;
DMA1_Channel2->CMAR = (uint32_t)rx_buf;
DMA_Cmd(DMA1_Channel2, ENABLE);


/* 清除中斷狀態暫存器 */
EXTI_ClearITPendingBit(EXTI_Line4);  
  }  
}