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发表于 2009-5-1 19:17:20
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to 【23楼】 ffxz
不客气。 我的SPI配置是这样的：
void SPI_Config(void)
{
u16 i,j;
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
/* GPIOA and GPIOC Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE);
/* SPI1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/* Configure SPI1 pins: SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure PD9 pin: CS pin ,PD10 : SD Power*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* SPI1 Config */
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_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* SPI1 enable */
SPI_Cmd(SPI1, ENABLE);
GPIO_ResetBits(GPIOD, GPIO_Pin_10); // SD卡上电，打开MOS管
for(i=0;i<65530;i++)
{
for(j=0;j<5000;j++)
{;}
}
}
另外
/* Select MSD Card: ChipSelect pin low */
#define MSD_CS_LOW() { GPIO_ResetBits(GPIOD, GPIO_Pin_9);}
/* Deselect MSD Card: ChipSelect pin high */
#define MSD_CS_HIGH() GPIO_SetBits(GPIOD, GPIO_Pin_9)
上电后， 粗暴延迟了一段时间。 文件系统可以跑起来。
没有设置优化，编译结果如下：
Program Size: Code=37682 RO-data=3306 RW-data=580 ZI-data=9412
finsh>>list_mem()
total memory: 10464
used memory : 2608
maximum allocated memory: 4748
0, 0x0000 |
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