Something

void fiq_record(void) ICODE_ATTR __attribute__ ((interrupt ("FIQ")));
void fiq_record(void)
{
    short value;
    pcm_more_callback_type2 more_ready;
    int status = 0;

    /* Clear interrupt */
#if CONFIG_CPU == PP5020
    IISCONFIG &= ~0x01;
#elif CONFIG_CPU == PP5002
    /* TODO */
#endif

    while (p_size > 0) {
        if (FIFO_FULL_COUNT < 2) {
            /* enable interrupt */
#if CONFIG_CPU == PP5020
            IISCONFIG |= 0x01;
#elif CONFIG_CPU == PP5002
            /* TODO */
#endif
            return;
        }

        value = (unsigned short)(IISFIFO_RD >> 16);
        if (value > peak_l) peak_l = value;
        else if (-value > peak_l) peak_l = -value;
        *(p++) = value;

        value = (unsigned short)(IISFIFO_RD >> 16);
        if (value > peak_r) peak_r = value;
        else if (-value > peak_r) peak_r = -value;
        *(p++) = value;

        p_size -= 4;

        /* If we have filled the current chunk, start a new one */
        if (p_size == 0) {
            rec_peak_left = peak_l;
            rec_peak_right = peak_r;
            peak_l = peak_r = 0;
        }
    }
    
    more_ready = pcm_callback_more_ready;

    if (more_ready != NULL && more_ready(status) >= 0)
    {
        logf("more ready");
        return;
    }
    logf("end");
    /* Finished recording */
    pcm_rec_dma_stop();
}