Other Parts Discussed in Thread: TMS320F28335, TMS320F28379D
Hi everybody,
I program on TMS320F28335 with a XDS100v1 and I have a problem using Fatfs module (0.09a and 1.0 have the same issue so I am the problem ^^) with it to write and read on a SD card. Here is a pseudo-code (Is something with SPI initialization bad ? ) :
int main(){
// Disable the watchdog initially
WDogDisable();
// SYSTEM CLOCK speed based on Crystal = 20 MHz (R1.1 controlCARD)
// 0xF = 150 MHz (15)
// 0xE = 140 MHz (14)
// 0xD = 130 MHz (13)
// 0xC = 120 MHz (12)
// 0xB = 110 MHz (11)
// 0xA = 100 MHz (10)
// 0x9 = 90 MHz (9)
// 0x8 = 80 MHz (8)
// 0x7 = 70 MHz (7)
// 0x6 = 60 MHz (6)
// 0x5 = 50 MHz (5)
// 0x4 = 40 MHz (4)
// 0x3 = 30 MHz (3)
// 0x2 = 20 MHz (2)
// SYSTEM CLOCK speed based on Crystal = 25 MHz (R1 controlCARD)
// 0xF = 187.5 MHz (15)
// 0xE = 175 MHz (14)
// 0xD = 162.5 MHz (13)
// 0xC = 150 MHz (12)
// 0xB = 137.5 MHz (11)
// 0xA = 125 MHz (10)
// 0x9 = 112.5 MHz (9)
// 0x8 = 100 MHz (8)
// 0x7 = 87.5 MHz (7)
// 0x6 = 75 MHz (6)
// 0x5 = 62.5 MHz (5)
// 0x4 = 50 MHz (4)
// 0x3 = 37.5 MHz (3)
// 0x2 = 25 MHz (2)
// SYSTEM CLOCK speed based on Crystal = 30 MHz (R1.2 controlCARD)
// 0xA = 150 MHz (10)
// 0x9 = 135 MHz (9)
// 0x8 = 120 MHz (8)
// 0x7 = 105 MHz (7)
// 0x6 = 90 MHz (6)
// 0x5 = 75 MHz (5)
// 0x4 = 60 MHz (4)
// 0x3 = 45 MHz (3)
// 0x2 = 30 MHz (2)
PLLset(0xA);// choose from options above based on the reference crystal
DINT; // Global Disable all Interrupts
IER = 0x0000; // Disable CPU interrupts
IFR = 0x0000; // Clear all CPU interrupt flags
PieCntlInit();
InitPieVectTable();
InitCpuTimers();
// Configure CPU-Timer 0 to interrupt every microsecond:
// 150MHz CPU Freq, 1 Period (in uSeconds)
// Generates a 100us period
ConfigCpuTimer(&CpuTimer0, 150, 50);
EALLOW;
// HIGH / LOW SPEED CLOCKS prescale register settings
SysCtrlRegs.HISPCP.all = 0x0001; // Sysclk / 2 (25 MHz)
SysCtrlRegs.LOSPCP.all = 0x0002; // Sysclk / 4 (25 MHz)
// Initialize Gpio
InitGpio();
// Initialize Spi
InitSpi();
/********************************* LECTURE *********************************************/
fresult = f_mount(0, &Fatfs); // It returns FR_OK SO IT SEEMS TO BE GOOD
fresult = f_open(&File, "Testounet.txt", FA_READ);
// It doesn't go out of f_open. There is an infinite loop in which depends on
// SPI transmission of a command.
}
void InitSpi(void){
InitSpiaGpio();
// Initialize SPI FIFO registers
SpiaRegs.SPIFFTX.all = 0xE040;
SpiaRegs.SPIFFRX.all = 0x204f;
SpiaRegs.SPIFFCT.all = 0x0;
SpiaRegs.SPICCR.all = 0x0007; // Reset on, rising edge, 16-bit char bits
SpiaRegs.SPICTL.all = 0x000E; // Enable master mode, normal phase, enable talk, and SPI int disabled.
SpiaRegs.SPIBRR = 0x007F;
SpiaRegs.SPICCR.all = 0x0087; // Reset on
SpiaRegs.SPIPRI.bit.FREE = 1; // Set so breakpoints don't disturb xmission
GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1; /* Switch to SPI MOSI */
GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1; /* Switch to SPI MISO */
GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1; /* Switch to SPI SCLK */
GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1; /* Switch to SPI SSEL */
}
void InitSpiaGpio(void){
EALLOW;
GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0; // Enable pull-up on GPIO16 (SPISIMOA)
GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0; // Enable pull-up on GPIO17 (SPISOMIA)
GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0; // Enable pull-up on GPIO18 (SPICLKA)
GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0; // Enable pull-up on GPIO19 (SPISTEA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // Asynch input GPIO16 (SPISIMOA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO17 = 3; // Asynch input GPIO17 (SPISOMIA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // Asynch input GPIO18 (SPICLKA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3; // Asynch input GPIO19 (SPISTEA)
GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1; // Configure GPIO16 as SPISIMOA
GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1; // Configure GPIO17 as SPISOMIA
GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1; // Configure GPIO18 as SPICLKA
GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1; // Configure GPIO19 as SPISTEA
EDIS;
}
I give you the part of f_open where the program enter in an infinite loop.
FRESULT f_open (
FIL *fp, /* Pointer to the blank file object */
const TCHAR *path, /* Pointer to the file name */
BYTE mode /* Access mode and file open mode flags */
)
{
FRESULT res;
DIR dj;
BYTE *dir;
DEF_NAMEBUF;
if (!fp) return FR_INVALID_OBJECT;
fp->fs = 0; /* Clear file object */
#if !_FS_READONLY
mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
res = chk_mounted(&path, &dj.fs, (BYTE)(mode & ~FA_READ));
In fact it is blocked in the chk_mounted function and more particularly in the while of this sub_function while :
/*-----------------------------------------------------------------------*/
/* Receive a byte from MMC via SPI (Platform dependent) */
/*-----------------------------------------------------------------------*/
static BYTE rcvr_spi (void){
BYTE ret;
SpiaRegs.SPITXBUF = 0xFF00; /* Transmit DUMMY Byte */
while(SpiaRegs.SPISTS.bit.INT_FLAG == 0){
}; /* Wait until the RXBUF has received last bit, but nothing happens...*/
ret = (SpiaRegs.SPIRXBUF); /*Read Byte from RXBUF and return */
return ret;
}
