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应如何将c5502的mcbsp配为gpio使用

我参考ti的c5502mcbsp使用说明的第9章将mcbsp1配为gpio模式,并对相关位域进行操作,实测相关管脚的电平并不正确,不知问题出在哪里?

请各位大神不吝赐教,代码如下:

MCBSP_Config Configclockstop8= {

  MCBSP_SPCR1_RMK(

MCBSP_SPCR1_DLB_OFF, /* DLB = 0 禁止数字回环*/
MCBSP_SPCR1_RJUST_RZF, /* RJUST = 0 接收数据符号拓展和调整方式*/
MCBSP_SPCR1_CLKSTP_NODELAY, /*MCBSP_SPCR1_CLKSTP_DISABLE 重要CLKSTP = 10 时钟停止模式 与CLKXP有关*/
MCBSP_SPCR1_DXENA_NA, /* DXENA = 0 DX引脚延时使能*/
MCBSP_SPCR1_ABIS_DISABLE, /* ABIS = 0 关闭abis*/
MCBSP_SPCR1_RINTM_RRDY, /* RINTM = 0 接收中断模式*/
0, /* RSYNCER = 0 接收帧同步错误标志*/
MCBSP_SPCR1_RRST_DISABLE /* RRST = 0 接收器复位*/
),
MCBSP_SPCR2_RMK(
MCBSP_SPCR2_FREE_NO, /* FREE = 0 */
MCBSP_SPCR2_SOFT_NO, /* SOFT = 0 */
MCBSP_SPCR2_FRST_RESET, /* FRST = 0 */
MCBSP_SPCR2_GRST_RESET, /* GRST = 0 */
MCBSP_SPCR2_XINTM_XRDY, /* XINTM = 0 */
0, /* XSYNCER = N/A */
MCBSP_SPCR2_XRST_DISABLE /* XRST = 0 */
),
MCBSP_RCR1_RMK(
MCBSP_RCR1_RFRLEN1_OF(0), /* RFRLEN1 = 0 帧长为一字*/
MCBSP_RCR1_RWDLEN1_8BIT /* RWDLEN1 = 0 每字为8bite*/
),
MCBSP_RCR2_RMK(
MCBSP_RCR2_RPHASE_SINGLE, /* RPHASE = 0 模式一:只与RCR1有关*/
MCBSP_RCR2_RFRLEN2_OF(0), /* RFRLEN2 = 0 */
MCBSP_RCR2_RWDLEN2_8BIT, /* RWDLEN2 = 0 */
MCBSP_RCR2_RCOMPAND_MSB, /* RCOMPAND = 0 非压缩模式*/
MCBSP_RCR2_RFIG_YES, /* 重要RFIG = 0 忽略错误的帧同步信号 */
MCBSP_RCR2_RDATDLY_1BIT /* RDATDLY = 1 延时1bit*/
),
MCBSP_XCR1_RMK(
MCBSP_XCR1_XFRLEN1_OF(0), /* XFRLEN1 = 0 帧长为一字*/
MCBSP_XCR1_XWDLEN1_8BIT /* XWDLEN1 = 0 每字8bite*/

),
MCBSP_XCR2_RMK(
MCBSP_XCR2_XPHASE_SINGLE, /* XPHASE = 0 模式一:帧长只与XCR1有关*/
MCBSP_XCR2_XFRLEN2_OF(0), /* XFRLEN2 = 0 */
MCBSP_XCR2_XWDLEN2_8BIT, /* XWDLEN2 = 0 */
MCBSP_XCR2_XCOMPAND_MSB, /* XCOMPAND = 0 不拓展*/
MCBSP_XCR2_XFIG_YES, /* 重要XFIG = 0 忽略错误的帧同步信号*/
MCBSP_XCR2_XDATDLY_1BIT /* XDATDLY =1 发送数据延时1bit*/
),
MCBSP_SRGR1_RMK(
MCBSP_SRGR1_FWID_OF(0), /* 停止模式无效**重要FWID = 0 帧同步信号的脉宽周期数*/
MCBSP_SRGR1_CLKGDV_OF(9) /* 停止模式无效**重要CLKGDV =9 CLKG时钟频率*/
),
MCBSP_SRGR2_RMK(
MCBSP_SRGR2_GSYNC_FREE, /* FREE = 0 内部时钟帧同步 */
MCBSP_SRGR2_CLKSP_RISING, /* 重要CLKSP = 0 CLKS 引脚极性*/
MCBSP_SRGR2_CLKSM_INTERNAL, /* 重要CLKSM = 1 cpu时钟*/
MCBSP_SRGR2_FSGM_DXR2XSR, /* FSGM = 0 发送帧同步模式,如果FXSM=1,当DXR->XSR时,McBSP产生帧同步信号*/
MCBSP_SRGR2_FPER_OF(249) /*重要 FPER = 0 FSG信号帧同步时钟周期Ω檬?*/
),
MCBSP_MCR1_DEFAULT,
MCBSP_MCR2_DEFAULT,
MCBSP_PCR_RMK(
//MCBSP_PCR_IDLEEN_RESET, /* IDLEEN = 0 省电使能*/
MCBSP_PCR_XIOEN_GPIO, /* XIOEN = 1 发送GPIO使能*/
MCBSP_PCR_RIOEN_GPIO, /* RIOEN = 1 接收GPIO使能*/
MCBSP_PCR_FSXM_INTERNAL, /* 重要FSXM = 1 发送帧同步模式,0由FSX引脚提供,1由McBSP提供*/
MCBSP_PCR_FSRM_INTERNAL, /* 重要FSRM = 1 接收帧同步模式,0由FSR引脚提供,1由McBSP提供*/
MCBSP_PCR_CLKXM_OUTPUT, /* 关键CLKXM = 1 主从模式*/
MCBSP_PCR_CLKXM_OUTPUT, /* 关键CLKRM = 0 主从模式*/
MCBSP_PCR_SCLKME_NO, /* SCLKME = 0 与CLKSM配合使用,cpu时钟模式*/
0, /* DXSTAT = N/A DX引脚上的电平*/
MCBSP_PCR_FSXP_ACTIVELOW, /* 重要FSXP = 0 发送帧同步极性,0正极性,1负极性*/
MCBSP_PCR_FSRP_ACTIVELOW, /* 重要FSRP = 0 接收帧同步极性,0正极性,1负极性*/
MCBSP_PCR_CLKXP_RISING, /*MCBSP_PCR_CLKXP_FALLING 重要CLKXP = 0 发送时钟极性,0正极性,1负极性*/
MCBSP_PCR_CLKRP_FALLING /*MCBSP_PCR_CLKRP_RISING 重要CLKRP = 0 接收时钟极性,0正极性,CLKR引脚上的上升沿,产生CLKG的上升沿,1负极性*/
),
MCBSP_RCERA_DEFAULT,
MCBSP_RCERB_DEFAULT,
MCBSP_RCERC_DEFAULT,
MCBSP_RCERD_DEFAULT,
MCBSP_RCERE_DEFAULT,
MCBSP_RCERF_DEFAULT,
MCBSP_RCERG_DEFAULT,
MCBSP_RCERH_DEFAULT,
MCBSP_XCERA_DEFAULT,
MCBSP_XCERB_DEFAULT,
MCBSP_XCERC_DEFAULT,
MCBSP_XCERD_DEFAULT,
MCBSP_XCERE_DEFAULT,
MCBSP_XCERF_DEFAULT,
MCBSP_XCERG_DEFAULT,
MCBSP_XCERH_DEFAULT
};

MCBSP_Handle mhMcbsp;

ioport volatile int * PCR=(volatile int *)0x2C12;
typedef struct
{
unsigned int PCR_CLKRP:1;
unsigned int PCR_CLKXP:1;
unsigned int PCR_FSRP:1;
unsigned int PCR_FSXP:1;
unsigned int PCR_DRSTAT:1;
unsigned int PCR_DXSTAT:1;
unsigned int PCR_CLKSSTAT:1;
unsigned int PCR_SCLKME:1;
unsigned int PCR_CLKRM:1;
unsigned int PCR_CLKXM:1;
unsigned int PCR_FSRM:1;
unsigned int PCR_FSXM:1;
unsigned int PCR_RIOEN:1;
unsigned int PCR_XIOEN:1;
unsigned int PCR_IDLEEN:1;
unsigned int PCR_Reserved:1;
}*PCR_ptr;
PCR_ptr g_pcr = 0;
#define SDO g_pcr->PCR_DXSTAT
#define SDI g_pcr->PCR_DRSTAT
#define SCK g_pcr->PCR_CLKXP
#define SCS g_pcr->PCR_FSXP

//SPI硬件层初始化
void SD_SPI_Init(void)
{ u8 pin;

mhMcbsp = MCBSP_open(MCBSP_PORT1, MCBSP_OPEN_RESET);

MCBSP_config(mhMcbsp, &Configclockstop8);

MCBSP_start(mhMcbsp,
MCBSP_RCV_START | MCBSP_XMIT_START,
0); 
g_pcr = (PCR_ptr)PCR;

/*gpio test*/
SCS = 0;_nop();pin = SDI;
SCS = 1;_nop();pin = SDI;
SDO = 0;
SDO = 1;
SCK = 0;
SCK = 1;

}