str710的SPI操作不能写入TXR寄存器:
接线如下:
STR710 AT45DB081
_______ __________
MISO |---------| DO
MOSI |---------| DI
SCK0 |---------| CK
P0.4 |---------| CS
P0.5 |---------| RST
______| |__________
我的程序如下:
#define BSPI0_MISO 0x0001 /* SPI0: Master in/Slave out data */
#define BSPI0_MOSI 0x0002 /* SPI0: Master out/Slave In data */
#define BSPI0_SCLK 0x0004 /* SPI0: Serial Clock */
#define BSPI0_SSN 0x0008 /* SPI0: SSN */
#define BSPI1_MISO 0x0010 /* SPI1: Master in/Slave out data */
#define BSPI1_MOSI 0x0020 /* SPI1: Master out/Slave In data */
#define AT45DB_CS BSPI1_MISO //AT45DBXXX片选端
#define AT45DB_RST BSPI1_MOSI //AT45DBXXX复位端
#define M25_SSN 0x0008 /* M25 Ship Select */
#define BSPI1_MC 0x0004 /* BSPI1 Master Config */
#define AT45SelEnable() { GPIO_BitWrite(GPIO0, 4, 0x0); }
#define AT45SelDisable() { GPIO_BitWrite(GPIO0, 4, 0x1); }
#define AT45RstEnable() { GPIO_BitWrite(GPIO0, 5, 0x0); }
#define AT45RstDisable() { GPIO_BitWrite(GPIO0, 5, 0x1); }
/*******************************************************************************
* Function Name : InitBSPIFlash
* Description : Initialize the BSPIFlash.
* Input : None.
* Return : None
*******************************************************************************/
void InitBSPIFlash (void)
{
/* Configure GPI00 on mode Alternate function Push Pull */
GPIO_Config ( GPIO0, BSPI0_MISO|BSPI0_SCLK|BSPI0_MOSI, GPIO_AF_PP );
/* Configure SCLK & SSN clock and data lines control */
GPIO_Config ( GPIO0, AT45DB_CS|AT45DB_RST, GPIO_OUT_PP );
/* Initialize BSPI0 device */
BSPI_Init ( BSPI0 );
/* Configure Baud rate Frequency: ---> APB1/6 */
BSPI_ClockDividerConfig (BSPI0, 12);
/* Enable BSPI1 */
BSPI_Enable ( BSPI0, ENABLE );
/* Configure BSPI1 as a Master */
BSPI_MasterEnable ( BSPI0, ENABLE );
/* Configure the clock to be active low */
BSPI_ClkActiveHigh ( BSPI0, DISABLE );
/* Enable capturing the first Data sample on the first edge of SCK */
BSPI_ClkFEdge ( BSPI0, DISABLE );
/* Set the word length to 16 bit */
BSPI_8bLEn ( BSPI0, ENABLE );
BSPI_FifoDisable(BSPI0) ; //禁止使用FIFO缓冲
AT45SelDisable() ; //
AT45RstEnable() ; //复位AT45DB081
//该处加入延时
AT45RstDisable() ;
}
int main (void)
{
/* Words to be transmitted */
u8 Sendtab[9]={'S','T','R','7','_','B','S','P','I'};
#ifdef DEBUG
debug();
#endif
InitBSPIFlash() ; //初始化SPI及AT45DB081
AT45SelEnable() ; //AT45DB081片选有效
BSPI_WordSend(BSPI0, 0x57) ; //发读状态寄存器命令
BSPI0->TXR = 0x5700 ;
BSPI0->TXR = 0xff00 ;
// BSPI_BufferSend(BSPI0,Sendtab,1);
BSPI_WordSend(BSPI0, 0xFF) ;
Sendtab[0] = BSPI_WordReceive(BSPI0) ;
AT45SelDisable() ;
// BSPI_BufferReceive(BSPI0,Receivetab,9);
while (1)
{
BSPI_WordSend(BSPI0, 0x57) ; //发读状态寄存器命令
}
}
表现:
1、调用的是KEIL的字带函数，控制积存器CSR1，CSR2都可以正确设置，但发送寄存器不能写入，总线上也测不到相应的信号。
2、用ULINK跟踪看出TXR没有被成功写入。
3、汇编代码应该是正确的：
如 BSPI0->TXR = 0x5700 汇编如下
82: BSPI0->TXR = 0x5700 ;
0x400003B8 E3A00C57 MOV R0,#0x00005700
0x400003BC E1C400B4 STRH R0,[R4,#0x04]
R0 = 0x00005700
R4 = 0xc000a000
情况就是这样，不那位仁兄知道，这是怎么回事，还请辞教一二，不胜感激！ |
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