关于MPC8270 的SPI驱动

foster 2010-2-5 22:18 楼主

小弟今天写了一段关于SPI的驱动代码。板子上是通过SPI对一块FLASH操作的。MPC作为master,FLASH作为slave。
下面是我的代码，主要就是一些寄存器的初始化，这是我第一次操刀写BSP，希望各位达人帮我看看有没有问题，大家相互交流一下！谢谢！

我把参数ram，rxBD和txBD，还有rxBuffer，txBuffer都放在dual_ram中，其中参数ram放在bank#11中，BD和BUFFER放在bank#2中。

在这段代码执行之前，我执行sysSerialHwInit()，在其中将Port D的16,17,18,19,20脚设置好，这段代码如下：

* M8260_IOP_PDDIR(immrVal) &= 0xFFFF07FC;    /* clear first */
* M8260_IOP_PDDIR(immrVal) |= 0x00000002;    /* TXD pin 30| RXD pin 31 */
* M8260_IOP_PDDIR(immrVal) |= 0x00000010;    /* set bit 27 for SCC2 */
* M8260_IOP_PDDIR(immrVal) &= ~0x00000008;    /* clear bit 28 for SCC2 */

* M8260_IOP_PDPAR(immrVal) |= 0x00000003;    /* TXD pin 30| RXD pin 31 */
* M8260_IOP_PDPAR(immrVal) |= 0x00000018;    /* set bits 27, 28 for SCC2*/
* M8260_IOP_PDPAR(immrVal) |= 0x00000004;    /* set bit 29 for SCC2*/
* M8260_IOP_PDPAR(immrVal) |= 0x00000020;    /* set bit 26 for SCC2*/
* M8260_IOP_PDPAR(immrVal) |= 0x0000F000;    /* set bit 16,17,18,19 for SPI*/

* M8260_IOP_PDSO(immrVal) &= 0xFFFFFFF8; /* clear first */
* M8260_IOP_PDSO(immrVal) |= 0x00000002; /* TXD pin 30 and RXD pin 31 */
* M8260_IOP_PDSO(immrVal) &= ~0x00000018; /* clear bits 27, 28 for SCC2 */
* M8260_IOP_PDSO(immrVal) &= ~0x00000020; /* clear bit 26 for SCC2 */
* M8260_IOP_PDSO(immrVal) |= 0x0000F000; /* set bit 16,17,18,19 for SCC2 */

* M8260_IOP_PDODR(immrVal) &= 0xFFFF08ED;
* M8260_IOP_PDDAT(immrVal) = 0x00000000;



/*
DESCRIPTION

This library contains routines for M8280 SPI BSP serial device
initialization
*/

#include "vxWorks.h"
#include "iv.h"
#include "intLib.h"
#include "config.h"
#include "sysLib.h"
#include "drv/parallel/m8260IOPort.h"
#include "drv/sio/m8260Cp.h"

IMPORT UINT32  vxImmrGet (void);

#define M8260_SPMODE(base) ((VINT32 *)((base) + 0x11AA0))
#define M8260_SPIE(base) ((VINT32 *)((base) + 0x11AA6))
#define M8260_SPIM(base) ((VINT32 *)((base) + 0x11AAA))
#define M8260_SPCOM(base) ((VINT32 *)((base) + 0x11AAD))
#define M8260_SPI_BASE(base) ((VINT32 *)((base) + 0x89FC))

#define M8260_SPI_PARARAM_OFFSET 0x9000
#define M8260_SPI_RARARAM(base) ((VINT32 *)((base) + M8260_SPI_PARARAM_OFFSET))
#define M8260_SPI_RXBD_OFFSET 0x0800
#define M8260_SPI_RXBD(base) ((VINT32 *)((base) + M8260_SPI_RXBD_OFFSET))
#define M8260_SPI_TXBD_OFFSET 0x0808
#define M8260_SPI_TXBD(base) ((VINT32 *)((base) + M8260_SPI_RXBD_OFFSET))

void sysSPIHwInit (void)
{

int immrVal = vxImmrGet();
*M8260_SPI_BASE=M8260_SPI_PARARAM_OFFSET; /*assign the pointer to SPI parameter RAM*/
*M8260_SPI_RARARAM(immrVal)=0x08080800; /*set rx BD table and tx BD table base address*/
*M8260_SPI_RARARAM(immrVal+0x4)=0x00101010; /*set RFCR ,TFCR and MRBLR*/
*M8260_SPI_RXBD(immrVal)=0x0000B000; /*set rx BD */
*M8260_SPI_RXBD(immrVal+4)=immrVal+0x0840;
*M8260_SPI_TXBD(immrVal)=0x0000B800; /*set tx BD */
*M8260_SPI_TXBD(immrVal+4)=immrVal+0x0860;
*M8260_CPCR(immrVal)=0x24510000; /*init rx and tx parameters*/
*M8260_SPIE(immrVal)=0x000000FF; /*clear all SPI events*/
*M8260_SPIM(immrVal)=0x00000037; /*enable all SPI interrupts*/
*M8260_SPMODE(immrVal)=0x00000370; /*set SPI mode*/

}

明天去试试，希望各位大侠如果看出有什么问题，能给我指教！我感觉应该不止就这么点代码。
再次多谢了！！