原创 LM3S6916硬件SPI驱动 AT45DB161D

几个星期https://static.assets-stash.eet-china.com/album/old-resources/2008/11/29/cf1a6b99-0e89-44a8-9e87-a4d87c706154.rar之前做过用LM3S6916硬件SPI驱动AT45DB161D的实验，实现了一些简单的功能，后来因为工程中没有再用到AT45DB161D，所以没有再继续做下去。

代码是在网上找的gxlujd（彩虹）写的“ATMEL的DATAFLASH操作函数库（FOR AT45DB161D）”，只要改SPI操作方面的函数就行了。

/* 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);
}

其他的没有改动，完整代码在附件中，其中包含有LCDTG12232的驱动，感谢gxlujd（彩虹）无私共享源代码！