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標題: LM3S6916硬件SPI驅動 AT45DB161D [打印本頁]

作者: wudawei 時間: 2014-12-31 22:08
標題: LM3S6916硬件SPI驅動 AT45DB161D
幾個星期之前做過用LM3S6916硬件SPI驅動AT45DB161D的實驗，實現了一些簡單的功能，后來因為工程中沒有再用到AT45DB161D，所以沒有再繼續做下去。
代碼是在網上找的gxlujd（彩虹）寫的“ATMEL的DATAFLASH操作函數庫（FOR AT45DB161D）”，只要改SPI操作方面的函數就行了。
/* Peripheral definitions for EK-LM3S6965 board */
#define SDC_SSI_BASE          SSI0_BASE
#define SDC_SSI_SYSCTL_PERIPH SYSCTL_PERIPH_SSI0
#define SDC_GPIO_PORT_BASE    GPIO_PORTA_BASE
#define SDC_GPIO_SYSCTL_PERIPH  SYSCTL_PERIPH_GPIOA
#define SDC_SSI_CLK          GPIO_PIN_2
#define SDC_SSI_TX             GPIO_PIN_5
#define SDC_SSI_RX             GPIO_PIN_4
#define SDC_SSI_PINS          (SDC_SSI_TX | SDC_SSI_RX | SDC_SSI_CLK)
#define SDC_CS_GPIO_PORT_BASE    GPIO_PORTA_BASE
#define SDC_CS_GPIO_SYSCTL_PERIPH  SYSCTL_PERIPH_GPIOA
#define SDC_CS                   GPIO_PIN_6
#define Select_Card()          GPIOPinWrite(SDC_CS_GPIO_PORT_BASE, SDC_CS, 0)
#define Deselect_Card()       GPIOPinWrite(SDC_CS_GPIO_PORT_BASE, SDC_CS, SDC_CS)

/*--------------------------- spi_hi_speed ----------------------------------*/
#define HI 1
#define LO 0
void spi_hi_speed(unsigned char on)
{
/* Set a SPI clock speed to desired value. */
SSIDisable(SDC_SSI_BASE);
if(on == HI){
   /* Max. 20 MBit used for Data Transfer. */
   SSIConfig(SDC_SSI_BASE, SSI_FRF_MOTO_MODE_0,SSI_MODE_MASTER,SysCtlClockGet() / 2, 8);
}
else {
   /* Max. 400 kBit used in Card Initialization. */
   SSIConfig(SDC_SSI_BASE, SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 400000, 8);
}
SSIEnable(SDC_SSI_BASE);
}
/*--------------------------- spi_send --------------------------------------*/
unsigned char spi_send(unsigned char outb)
{
// Write and Read a byte on SPI interface.
unsigned long inb;
SSIDataPut(SDC_SSI_BASE, outb);
SSIDataGet(SDC_SSI_BASE, (unsigned long *)&inb);
return (inb);
}

//*****************************************************************************
//
// SramInit puts the SRAM device in burst mode then polls the status register
// for a valid status response. Returns True if successful.
//
//*****************************************************************************
void SPI_Init(void)
{
/* Initialize and enable the SSP Interface module. */
unsigned long i;

/* Enable the peripherals used to drive the SDC on SSI, and the CS */
SysCtlPeripheralEnable(SDC_SSI_SYSCTL_PERIPH);
SysCtlPeripheralEnable(SDC_GPIO_SYSCTL_PERIPH);
SysCtlPeripheralEnable(SDC_CS_GPIO_SYSCTL_PERIPH);

/* Configure the appropriate pins to be SSI instead of GPIO */
GPIODirModeSet(SDC_GPIO_PORT_BASE, SDC_SSI_PINS, GPIO_DIR_MODE_HW);
GPIODirModeSet(SDC_CS_GPIO_PORT_BASE, SDC_CS, GPIO_DIR_MODE_OUT);
GPIOPadConfigSet(SDC_GPIO_PORT_BASE, SDC_SSI_CLK, GPIO_STRENGTH_4MA,GPIO_PIN_TYPE_STD_WPU);
GPIOPadConfigSet(SDC_GPIO_PORT_BASE, SDC_SSI_TX | SDC_SSI_RX,GPIO_STRENGTH_4MA, GPIO_PIN_TYPE_STD_WPU);
GPIOPadConfigSet(SDC_CS_GPIO_PORT_BASE, SDC_CS,GPIO_STRENGTH_4MA, GPIO_PIN_TYPE_STD_WPU);

/* Deassert the SSI0 chip select */
GPIOPinWrite(SDC_CS_GPIO_PORT_BASE, SDC_CS, SDC_CS);

/* Configure the SSI0 port */
SSIConfig(SDC_SSI_BASE, SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 400000, 8);
SSIEnable(SDC_SSI_BASE);

/* Send SPI Command with card not selected at 400 KBit. */
Deselect_Card();
for (i = 0; i < 16; i++)spi_send(0xFF);
}
其他的沒有改動，完整代碼在附件中，其中包含有LCDTG12232的驅動，感謝gxlujd（彩虹）無私共享源代碼！

歡迎光臨 (http://m.zg4o1577.cn/bbs/)