/******************************************************************************
/ 函数功能:初始化W25Q64
/ 修改日期:2013/9/10 19:04:16
/ 输入参数:none
/ 输出参数:none
/ 使用说明:none
******************************************************************************/
void W25X_Init(void)
{
SPI_InitTypeDef SPI_InitStructure ;
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//配置DMA通道,DMA1_CH2收
//读取SPI FLASH时多数为空数据故而数据地址无需增加
//启动DMA1的时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_DeInit(DMA1_Channel2);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&SPI1->DR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)W25X_Buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 0;
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);
//配置DMA通道,DMA1_CH3发送
DMA_DeInit(DMA1_Channel3);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&SPI1->DR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)(&W25X_TX_Byte);
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = 0;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
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_Medium;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);
//关闭DMA,清DMA标记,使能DMA1_CH2的传输完成中断
DMA_Cmd(DMA1_Channel3, DISABLE); //关闭发送DMA
DMA_Cmd(DMA1_Channel2, DISABLE); //关闭接收DMA
DMA_ClearFlag(DMA1_FLAG_GL3|DMA1_FLAG_TC3|DMA1_FLAG_HT3|DMA1_FLAG_TE3);
DMA_ClearFlag(DMA1_FLAG_GL2|DMA1_FLAG_TC2|DMA1_FLAG_HT2|DMA1_FLAG_TE2);
DMA_ITConfig(DMA1_Channel2,DMA_IT_TC,ENABLE);
//初始化SPI时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);
// SPI配置
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_InitStructure.SPI_CPHA = SPI_CPHA_1Edge ;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft ;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2 ; //72MHz分频
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB ; //SPI设置成LSB模式
SPI_InitStructure.SPI_CRCPolynomial = 7 ;
SPI_Init( SPI1, &SPI_InitStructure ) ;
SPI_Cmd(SPI1,ENABLE); //启动SPI
//打开SPI1的DMA发送接收请求
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
//清DMA忙信号
sem_W25X_DMA_Busy = false;
//使能NVIC中断
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = W25X_DMA_TC_PRIO;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
|