CCS/LAUNCHXL-CC2640R2: Can't Read ID from External Flash (IS25LP256D)

Dear Gokul H,


Do you have a logic logic analyzers that you can use to probe the SPI signals? If so, can you post your trace here?

With the 0x90 instruction you are supposed to get 2 ID bytes back (Manufacturer and device), are you only reading one byte back? What address are you setting (A0)?

Best Regards,
R.M

Hi,

This  is the function that I used.

/*!< Send "RDID " instruction */

 txbuff[0] = issiFLASH_CMD_RDPID;

 txbuff[1] = issiFLASH_DUMMY_BYTE;

 txbuff[2] = issiFLASH_DUMMY_BYTE;

 txbuff[3] = issiFLASH_DUMMY_BYTE;

 Send_spi(txbuff,rxbuff,4);

/*The instruction is defined as follows:*/

#define issiFLASH_CMD_RDPID             0x90//AB  /*!< Read product identification */

As per the datasheet, I have sent 0xAB but no data was available in rxbuff. The i tried with 0x90 and got the value '2'.

Since, I am sending 3 dummy cycles I got same value thrice.

The SPI initialization code as follows

void spi_init()
{
//PIN_init(BoardGpioInitTable);

/* Open LED pins */
pinHandle = PIN_open(&pinState, spipinTable);
if(!pinHandle) {
System_abort("Error initializing board pins\n");
}
spiParams.mode = SPI_MASTER;
spiParams.dataSize = 8;
spiParams.transferMode = SPI_MODE_BLOCKING;
spiParams.transferTimeout = SPI_WAIT_FOREVER;
spiParams.bitRate = 12000000;
spiParams.custom =(uintptr_t) NULL;
spiParams.frameFormat = SPI_POL1_PHA1;
spiParams.transferCallbackFxn = NULL;
//SPI_Params_init(&spiParams); // Initialize SPI parameters
// 8-bit data size
SPI_init(); // Initialize the SPI driver
spi = SPI_open(Board_SPI0, &spiParams);
if (spi == NULL)
System_abort("Error initializing spi\n"); // SP

printf("spi initialised\n");
}

I dont have a logic analyzer with me. But i checked the MOSI and CS lines using DSO.

Dear Gokul H,

I see that you use 12 MHz as bit rate, can you reduce that and see if it helps?
Maximum supported bit rate for Master and duplex operation for CC2640R2F is 6 MHz (8 system clocks)

Best Regards,
R.M

Hi,

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Regards,
R.M

hello,
I reduced the bit rate to 6Mhz Then also the result is the same

should i use SPI_FLASH_CS config for communicating to flash or NORMAL SPI0/SPI1 config.

Also there is one more issue to be resolved regarding dual spi in cc2640.
Please provide sample code that demonstrates the use of spi0 and spi1 .
In our application spi0 is used to communicate with CAN driver and spi1 to flash memory.But as stated above communication with flash is not taking place, so for testing purpose of dual spi communication with spi of arduino is checked. But that also is not working
Please provide any documents to help me with the problem

Hi,

Have you tried reducing the speed lower than 6 MHz? I would try with <1 MHz just to see if speed is the issue.
I strongly recommend that you get a hold of a logic analyzer and probe the signals so that we can debug further.

We do not have sample code for dual SPI usage.

Best Regards,
R.M