Hi, I have used TMS320VC5510 DSK to connect with a RF module through SPI.
I encounter a problem that using scope I can see the correct timing
of transmit data, receive data, FSX, and CLKX. But after that RRDY in
SPCR10 does not pulled high.
More detail, I try to write a register in RF module and read it back,
checking whether it is the same. I'm sure that in scope I see the
writing
did happens and RF module did transmit the register data back to me. But I
did not see any change in RRDY. That is I can see the RF module send data to DR
pin, but no changes happen on RRDY.
In the reason I can't receive data by detecting RRDY. Does there have
some
procedure that I've lost to do? I would be very appreciated for your
helping.
Regards, SJ Hsu
ps1. The RF module works as following sequences :
A. Write:
1. Generate FSX as slave enable, generate CLKX (SCLK).
2. First write 8 bits address.
3. Then write 8 bits data.
B. Read:
1. Generate FSX as slave enable, generate CLKX (SCLK).
2. First write 8 bits address.
3. Then RF module will reponse 8 bits data back. RF module will
not care the incoming data while it is responding.
ps2. Following is my setting about SPI and my code.
MCBSP_Config spi_Init = {
0x1830, /* Serial Port Control Register 1 */
0x0130, /* Serial Port Control Register 2 */
0x0040, /* Receive Control Register 1 */
0x0005, /* Receive Control Register 2 */
0x0040, /* Transmit Control Register 1 */
0x0005, /* Transmit Control Register 2 */
0x001f, /* Sample Rate Generator Register 1 */
0x2000, /* Sample Rate Generator Register 2 */
0x0000, /* Multichannel Control Register 1 */
0x0000, /* Multichannel Control Register 2 */
0x0e09, /* Pin Control Register */
0x0000, /* Receive Channel Enable Register Partition A */
0x0000, /* Receive Channel Enable Register Partition B */
0x0000, /* Receive Channel Enable Register Partition C */
0x0000, /* Receive Channel Enable Register Partition D */
0x0000, /* Receive Channel Enable Register Partition E */
0x0000, /* Receive Channel Enable Register Partition F */
0x0000, /* Receive Channel Enable Register Partition G */
0x0000, /* Receive Channel Enable Register Partition H */
0x0000, /* Transmit Channel Enable Register Partition A */
0x0000, /* Transmit Channel Enable Register Partition B */
0x0000, /* Transmit Channel Enable Register Partition C */
}
void spi_init ()
{
MCBSP_FSET(SPCR10, RRST, 0) ; // reset Rx
MCBSP_FSET(SPCR20, XRST, 0) ; // reset Tx
MCBSP_FSET(SPCR20, FRST, 0) ; // reset frame-sync logic
MCBSP_FSET(SPCR20, GRST, 0) ; // reset sample rate generator
MCBSP_config(hMcbsp0, &spi_Init) ;
MCBSP_FSET(SPCR20, GRST, 1); // enable sample rate generator
MCBSP_FSET(SPCR20, FRST, 1); // enable frame-sync logic
MCBSP_FSET(SPCR10, RRST, 1); // set Rx
MCBSP_FSET(SPCR20, XRST, 1); // set Tx
}
void spi_sw(UINT8 addr, UINT8* dataPtr)
{
UINT 8 i;
addr = (addr << 9) | 0x0100 ; // address packet for RF module
addr = addr | (*dataPtr) ; // data packet for RF module
while (MCBSP_FGET(SPCR20,XRDY)== 0) {}
// write address to DXR
MCBSP_RSET (DXR20,0) ;
MCBSP_RSET (DXR10,addr);
for(i = 0; i < 10; i++) ; // delay for RF module working
}
void spi_sr(UINT8 addr, UINT8* dataPtr)
{
addr = ((UINT16)addr << 9) ;// address packet for RF module
while (MCBSP_FGET(SPCR20,XRDY)== 0) {}
// write address to DXR
MCBSP_RSET (DXR20,0) ;
MCBSP_RSET (DXR10,addr);
while (MCBSP_FGET(SPCR10,RRDY) == 0) {}
// read data back
*dataPtr = MCBSP_RGET(DRR10) ;
}
UINT8 d = 0xaa ;
UINT8 r = 0x01 ;
void main()
{
spi_init() ;
spi_sw(0x01, &d) ;
spi_sr(0x01, &r) ;
printf("The returned value : %d", r) ;
}
