Posted on May 17, 2011 at 13:50/* Defines for the SPI and GPIO pins used to drive the SPI Flash */
#define SPI_FLASH SPI2
#define SPI_FLASH_CLK RCC_APB1Periph_SPI2
#define SPI_FLASH_GPIO GPIOB
#define SPI_FLASH_GPIO_CLK RCC_APB1Periph_SPI2
#define SPI_FLASH_CS_GPIO_CLK RCC_APB2Periph_GPIOB
#define SPI_FLASH_CS GPIO_Pin_12
#define SPI_FLASH_PIN_SCK GPIO_Pin_13
#define SPI_FLASH_PIN_MISO GPIO_Pin_14
#define SPI_FLASH_PIN_MOSI GPIO_Pin_15
#define SPI_FLASH_CS_GPIO GPIOB
/*******************************************************************************
* Function Name : SPI_FRAM_Init
* Description : Function to initialize SPI
* Return : None
*******************************************************************************/
VOID SPI_FRAM_Init(VOID)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable SPI and GPIO clocks */
RCC_APB1PeriphClockCmd(SPI_FLASH_CLK | SPI_FLASH_GPIO_CLK | SPI_FLASH_CS_GPIO_CLK, ENABLE);
/* Configure SPI pins: SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = SPI_FLASH_PIN_SCK | SPI_FLASH_PIN_MISO | SPI_FLASH_PIN_MOSI;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(SPI_FLASH_GPIO, &GPIO_InitStructure);
/* Configure I/O for Flash Chip select */
GPIO_InitStructure.GPIO_Pin = SPI_FLASH_CS;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SPI_FLASH_CS_GPIO, &GPIO_InitStructure);
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
/* SPI configuration */
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; /* PCLK1 = HCLK/4 72/4=18= 18/2= 9Mhz*/
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI_FLASH, &SPI_InitStructure);
/* Enable the SPI */
SPI_Cmd(SPI_FLASH, ENABLE);
}
