Hi,
I am interfacing SST25VF016B with Tiva Series TM4C1230H6PM. I am trying to read the JEDEC ID from serial flash SST25VF016B but i have received only 00 00 00. And i have noticed, the SO Pin is not sending out any data.
I am using 10 MHZ system clock. I can able to generate the clock. I checked in CRO and the read instruction (0x9F) is going fine and i saw the clock also working fine. the problem here is serial is not sending any data on SO Pin. Please guide me. I have attached the snap shot of CRO signals.
void Configure_SPI(void)
{
uint32_t clk=0;
char buf[10];
//
// The SSI1 peripheral must be enabled for use.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI1);
//SysCtlPeripheralEnable (SYSCTL_RCGC1_SSI1);
//
// For this example SSI1 is used with PortD[0:3]. The actual port and pins
// used may be different on your part, consult the data sheet for more
// information. GPIO port D needs to be enabled so these pins can be used.
// TODO: change this to whichever GPIO port you are using.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, GPIO_PIN_1); //SSI1Fss
GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_1, GPIO_PIN_1);
//
// Configure the pin muxing for SSI1 functions on port D3, D2, D1, and D0.
// This step is not necessary if your part does not support pin muxing.
// TODO: change this to select the port/pin you are using.
//
GPIOPinConfigure(GPIO_PD0_SSI1CLK);
GPIOPinConfigure(GPIO_PD2_SSI1RX);
GPIOPinConfigure(GPIO_PD3_SSI1TX);
//
// Configure and enable the SSI port for SPI master mode. Use SSI1,
// system clock supply, idle clock level low and active low clock in
// freescale SPI mode, master mode, 1MHz SSI frequency, and 8-bit data.
// For SPI mode, you can set the polarity of the SSI clock when the SSI
// unit is idle. You can also configure what clock edge you want to
// capture data on. Please reference the datasheet for more information on
// the different SPI modes.
//
clk = SysCtlClockGet();
sprintf (buf,"%d",clk);
UartSend5(buf);
ROM_SSIConfigSetExpClk(SSI1_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0,
SSI_MODE_MASTER, 5000000, 8);
//
// Configure the GPIO settings for the SSI pins. This function also gives
// control of these pins to the SSI hardware. Consult the data sheet to
// see which functions are allocated per pin.
// The pins are assigned as follows:
// PD3 - SSI1Tx
// PD2 - SSI1Rx
// PD1 - SSI1Fss
// PD0 - SSI1CLK
// TODO: change this to select the port/pin you are using.
//
GPIOPinTypeSSI( GPIO_PORTD_BASE,GPIO_PIN_0| GPIO_PIN_3 | GPIO_PIN_2 );
// HWREG (SSI1_BASE + SSI_O_CR1) |= SSI_CR1_LBM;
//
// Enable the SSI1 module.
//
SSIEnable(SSI1_BASE);
}
void EnableDevice()
{
GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_1, GPIO_PIN_1); /* enable device */
delay_ms (100);
GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_1, 0); /* enable device */
//delay_ms (100);
//GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_1, GPIO_PIN_1);
delay_ms (100);
}
unsigned long Jedec_ID_Read(void)
{
uint32_t temp,temp1,temp2 ;
char buf[10],b uf1[10],buf2[10],buf3[3];
temp = 0;temp2=0;temp1=0;
GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_1, 0); /* enable device */
delay_ms (100);
SSIDataPut (SSI1_BASE,0x9F); /* send JEDEC ID command (9Fh) */
SSIDataPut(SSI1_BASE,0x00);
SSIDataGet (SSI1_BASE, &temp2);
sprintf (buf1,"%x",temp2);
SSIDataPut(SSI1_BASE,0x00);
SSIDataGet (SSI1_BASE, &temp2);
sprintf (buf2,"%x",temp2);
SSIDataPut(SSI1_BASE,0x00);
SSIDataGet (SSI1_BASE, &temp2);
sprintf (buf3,"%x",temp2);
delay_ms (50);
GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_1, GPIO_PIN_1); /* disable device */
delay_ms (100);
sprintf (buf,"%x",temp2);
return temp;
}
int main ()
{
SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_10MHZ);
FPUEnable();
ROM_FPULazyStackingEnable();
Configure_SPI();
EnableDevice ();
delay_ms (100);
Jedec_ID_Read ();
return 0;
}
Please help me to come out of this issue.
Thanks,
Shanmugam
