Posted on November 16, 2011 at 01:47#define SPI2_GPIO_CLK RCC_APB2Periph_GPIOB
#define SPI2_PORT GPIOB
#define SPI2_CLK RCC_APB1Periph_SPI2
#define SPI2_SCK_PIN GPIO_Pin_13
#define SPI2_MISO_PIN GPIO_Pin_14
#define SPI2_MOSI_PIN GPIO_Pin_15
#define SPI2_NSS_PIN GPIO_Pin_12
#endif /* USE_SPI2 */
#define DUMMY_DATA 0x11
#define F_RAM_SPI_ID SPI2_ID
#define F_RAM_PORT SPI2_PORT
#define F_RAM_SCK_PIN SPI2_SCK_PIN
#define F_RAM_MISO_PIN SPI2_MISO_PIN
#define F_RAM_MOSI_PIN SPI2_MOSI_PIN
#define F_RAM_NSS_PIN SPI2_NSS_PIN
#define __SPI_HW__ 1
void SPI_Low_DeInit(void)
{
SPI_Cmd(SPI2,DISABLE);
SPI_I2S_DeInit(SPI2);
}
void RCC_Configuration_SPI(void)
{
/*!< F_RAM_SPI_CS_GPIO, F_RAM_SPI_MOSI_GPIO, F_RAM_SPI_MISO_GPIO
and F_RAM_SPI_SCK_GPIO Periph clock enable */
#ifdef USE_SPI2
RCC_APB2PeriphClockCmd(SPI2_GPIO_CLK | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(SPI2_CLK, ENABLE);
#endif
}
void GPIO_Configuration_SPI(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
#ifdef USE_SPI2
/*!< Configure F_RAM_SPI pins: SCK */
#ifdef __SPI_HW__
GPIO_InitStructure.GPIO_Pin = SPI2_SCK_PIN | SPI2_MOSI_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(SPI2_PORT, &GPIO_InitStructure);
#elif __SPI_SW__
GPIO_InitStructure.GPIO_Pin = SPI2_SCK_PIN | SPI2_MOSI_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SPI2_PORT, &GPIO_InitStructure);
#endif /* __SPI_HW__ */
GPIO_InitStructure.GPIO_Pin = SPI2_MISO_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
//GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(SPI2_PORT, &GPIO_InitStructure);
/*!< Configure F_RAM_CS_PIN pin: F_RAM Card CS pin */
GPIO_InitStructure.GPIO_Pin = SPI2_NSS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SPI2_PORT, &GPIO_InitStructure);
#endif /* USE_SPI2 */
}
void SPI_Configuration(void)
{
#ifdef __SPI_HW__
SPI_InitTypeDef SPI_InitStructure;
/*!< Deselect the F-RAM: Chip Select high */
//F_RAM_HOLD_HIGH();
F_RAM_CS(Bit_SET);
#ifdef USE_SPI2
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
#if 0
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
#else
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
#endif
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
#if 0
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
#else
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
#endif
#if 0
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
#else
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
#endif
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
/*!< Enable the sFLASH_SPI */
SPI_Cmd(SPI2, ENABLE);
#endif /* USE_SPI2 */
#endif /* __SPI_HW__ */
}
void main(void)
{
SPI_Low_DeInit();
GPIO_Configuration_SPI();
RCC_Configuration_SPI();
SPI_Configuration();
}
u8 F_RAM_SendByte(u8 byte)
{
u8 ret;
/*!< Loop while DR register in not emplty */
while (SPI_I2S_GetFlagStatus(F_RAM_SPI, SPI_I2S_FLAG_TXE) == RESET);
/*!< Send byte through the SPI1 peripheral */
SPI_I2S_SendData(F_RAM_SPI,(u16)byte);
/*!< Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(F_RAM_SPI, SPI_I2S_FLAG_RXNE) == RESET);
/*!< Return the byte read from the SPI bus */
ret = (u8)SPI_I2S_ReceiveData(F_RAM_SPI);
return ret;
}
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