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楼主 |
发表于 2015-1-16 10:38:22
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嗯 是的 是F4的片子 NORMAL 还要每次重新开启DMA 关闭DMA 吧
void SPI2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //引脚初始化
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_SPI2); //打开引脚的复用功能
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2);
//GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
/* DMA configuration -------------------------------------------------------*/
/* Deinitialize DMA Streams */
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(SPIx_TX_DMA_STREAM);
DMA_DeInit(SPIx_RX_DMA_STREAM);
/* Enable DMA clock */
RCC_AHB1PeriphClockCmd(SPIx_DMA_CLK, ENABLE);
/* Configure DMA Initialization Structure */
DMA_InitStructure.DMA_BufferSize = BUFFERSIZE ;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable ;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull ;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single ;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t) (&(SPI2->DR)) ;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
/* Configure TX DMA */
DMA_InitStructure.DMA_Channel = SPIx_TX_DMA_CHANNEL ;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral ;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)SPI_Buffer_Tx;
DMA_Init(SPIx_TX_DMA_STREAM, &DMA_InitStructure);
/* Configure RX DMA */
DMA_InitStructure.DMA_Channel = SPIx_RX_DMA_CHANNEL ;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory ;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)SPI_Buffer_Rx;
DMA_Init(SPIx_RX_DMA_STREAM, &DMA_InitStructure);
// /* Enable DMA SPI TX Stream */
// DMA_Cmd(SPIx_TX_DMA_STREAM,ENABLE);
//
// /* Enable DMA SPI RX Stream */
// DMA_Cmd(SPIx_RX_DMA_STREAM,ENABLE);
/* Enable SPI DMA TX Requsts */
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);
/* Enable SPI DMA RX Requsts */
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);
/* Waiting the end of Data transfer */
//while (DMA_GetFlagStatus(SPIx_TX_DMA_STREAM,SPIx_TX_DMA_FLAG_TCIF)==RESET);
// while (DMA_GetFlagStatus(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF)==RESET);
/* Clear DMA Transfer Complete Flags */
//DMA_ClearFlag(SPIx_TX_DMA_STREAM,SPIx_TX_DMA_FLAG_TCIF);
//DMA_ClearFlag(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF);
SPI_Cmd(SPI2, ENABLE);
SPI2_ReadWriteByte(0xff);
}
void SPI2_SetSpeed(u8 SPI_BaudRatePrescaler)
{
assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
SPI2->CR1&=0XFFC7;
SPI2->CR1|=SPI_BaudRatePrescaler;
SPI_Cmd(SPI2,ENABLE);
}
#define nodma
u8 SPI2_ReadWriteByte(u8 TxData)
{ u16 retry=0;
#if defined nodma
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET)
{
retry++;
if(retry>263)return 0;
}
SPI_I2S_SendData(SPI2, TxData);
retry=0;
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET)
{
retry++;
if(retry>263)return 0;
}
return SPI_I2S_ReceiveData(SPI2);
#elif defined dma
u16 i = 0;
u8 temp=0,temp1=0;
SPI_Buffer_Tx=TxData;
/* Enable DMA SPI TX Stream */
DMA_Cmd(SPIx_TX_DMA_STREAM,ENABLE);
/* Enable DMA SPI RX Stream */
DMA_Cmd(SPIx_RX_DMA_STREAM,ENABLE);
while(1)
{
temp=DMA_GetFlagStatus(SPIx_TX_DMA_STREAM,SPIx_TX_DMA_FLAG_TCIF);
temp1= DMA_GetFlagStatus(SPIx_TX_DMA_STREAM,SPIx_TX_DMA_FLAG_TCIF);
if(temp==SET||temp1==SET)
break;
}
while (DMA_GetFlagStatus(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF)==RESET);
return SPI_Buffer_Rx[0];
DMA_ClearFlag(SPIx_TX_DMA_STREAM,SPIx_TX_DMA_FLAG_TCIF);
DMA_ClearFlag(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF);
#endif
}
}
这个是我根据原子的列程改的 #define dma 是FATFS 显示 FR_NOT_READY
#define nodma 则可以使用文件系统 一切都正常 但是不满足 我想要的写入要求 想要提高速度 所以想到了用DMA 不知道还有什么方法可以提高写入SD卡的速度 |
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发表于 2015-1-15 11:42:24
