iammingge / driver_w25qxx Goto Github PK

Hello, first of all thanks for the lib!

I am implementing this lib on my project, but i have a question about W25Qxx_ReadStatus & W25Qxx_isStatus functions because i think at first it doesn't work as it should on my project. When i try to read or write the flash, it internally checks if the memory is at IDLE status, but it returns to me busy status when the status registers of W25Qxx are "idle".

The posible status of the memory are:

typedef enum {
    W25Qxx_STATUS_IDLE             = 0x01,
    W25Qxx_STATUS_BUSY             = 0x02,
    W25Qxx_STATUS_SUSPEND          = 0x04,
    W25Qxx_STATUS_BUSY_AND_SUSPEND = 0x08
} W25Qxx_STATUS;

and the W25Qxx_ReadStatus function is:

uint8_t W25Qxx_ReadStatus(void)   /* Read current chip running status */
{
    uint8_t ret = 0;

    ret |= W25Qxx_RBit_BUSY();
    ret |= W25Qxx_RBit_SUS()<<1;

    return (2 ^ ret);
}

So "ret" variable have 4 values:

• 0: IDLE
• 1: BUSY
• 2: SUSPEND
• 3: BUSY & SUSPEND

But if "ret" is 0 value (idle) the xor operator (^) returns 2 (2^0 = 2) and the status returned will be "W25Qxx_STATUS_BUSY".

If xor is remplaced with a pow operator the values will be:

• 2 ** 0 = 1 (W25Qxx_STATUS_IDLE)
• 2 ** 1 = 2 (W25Qxx_STATUS_BUSY)
• 2 ** 2 = 4 (W25Qxx_STATUS_SUSPEND)
• 2 ** 3 = 8 (W25Qxx_STATUS_BUSY_AND_SUSPEND)

Where ** is pow operator