I’m trying to create library for stm32 and w25q01jvzeim flash. First of all i’m trying to read JEDEC ID without success.

My function:

CMD_DUMMY = 0x00
CMD_JEDEC_ID = 0x9F

static void W25Qxxx_Read_JEDEC_ID(void)
{
    uint32_t JEDEC_ID = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;

    W25Qxxx_Enable();

    W25Qxxx_SPI(CMD_JEDEC_ID);
    Temp0 = W25Qxxx_SPI(CMD_DUMMY);
    Temp1 = W25Qxxx_SPI(CMD_DUMMY);
    Temp2 = W25Qxxx_SPI(CMD_DUMMY);

    W25Qxxx_Disable();
    JEDEC_ID = (Temp0 << 16) | (Temp1 << 8) | Temp2;
    printf("0x%08lX n", JEDEC_ID);

    W25Qxxx_JEDEC_ID = JEDEC_ID;
}

I got strange result 0x0000EFAA my SPI line works well as I detect the manufacter 0xEF is windbond. But I can’t get capacity,memory type, in the datasheet the JEDED ID for my flash is 0x7021h