SPI based flash memory interface issue

[engr.waqas]

I am using a SPI flash memory, AT25DF021, with PIC24FJ64GB004 microcontroller. I am using the following C30 SPI library code (OpenSPI1()) and configuration to initiate the SPI peripheral of MCU. I have remapped the correct MCU pins for SPI peripheral (using C30's PPS library). I later use putsSPI1() and getsSPI1() library functions to communicate with AT25DF021 but no proper data transmission and reception happens.


#define USE_AND_OR

// Mode-0, Master, 8-bit data
OpenSPI1(DISABLE_SCK_PIN | ENABLE_SDO_PIN | SPI_MODE8_ON | SPI_SMP_OFF | SPI_CKE_ON | SLAVE_ENABLE_OFF |
CLK_POL_ACTIVE_HIGH | MASTER_ENABLE_ON | SEC_PRESCAL_1_1 | PRI_PRESCAL_16_1, FRAME_ENABLE_OFF |
FRAME_SYNC_OUTPUT | FRAME_SYNC_ACTIVE_LOW | SPI_FRM_PULSE_PREV_CLK | SPI_ENH_BUFF_DISABLE,
SPI_ENABLE | SPI_IDLE_CON | SPI_RX_OVFLOW_CLR);


//........ Flash read code below

unsigned int NFWA[5];


MEMORY_CS=0; // memory chip select
NFWA[0]=0x03; // "Read Array" SPI command
NFWA[1]=0x00; // 3 address bytes (0x000000)
NFWA[2]=0x00;
NFWA[3]=0x00;

SPI1send(4, (unsigned int *)NFWA);

SPI1receive(2, (unsigned int *)NFWA, 40); // Reading 2 bytes in NFWA[]

MEMORY_CS=1;
// NFWA[0] has 0x0000 now


Please tell me whether I am using the correct SPI configuration for AT25DF021. Or, do you see any other problem.

 

[ALERTLINKS]

First expect a warning from MODS because of posting code without a code tag;-):roll::evil: