[help]: Meaning of Port A/B in GPIO

[Sutter099]

Help

There are 72 gpio pins in K230:

0  ~ 31 -> gpio0
32 ~ 63 -> gpio1
64 ~ 71 -> gpio2

But only gpio0 and gpio1 has complete register group.

In drv_gpio.c, port B registers of gpio1 was used to control direction/input/output.

like

int kd_pin_read(rt_base_t pin)
{
    int ret = check_pin_valid(pin);
    if(ret == -1)
    {
        LOG_E("pin %d not valid for read", pin);
        return -RT_ERROR;
    }
    if(pin < 32)
        return kd_gpio_reg_readl(kd_gpio[0] + DATA_INPUT, pin) == GPIO_PV_HIGH ? PIN_HIGH : PIN_LOW;
    else {
        pin -= 32;
        if(pin < 32)
            return kd_gpio_reg_readl(kd_gpio[1] + DATA_INPUT, pin) == GPIO_PV_HIGH ? PIN_HIGH : PIN_LOW;
        else {
            pin -= 32;
            return kd_gpio_reg_readl(kd_gpio[1] + DATA_INPUT + DATA_INPUT_STRIDE, pin) == GPIO_PV_HIGH ? PIN_HIGH : PIN_LOW;
                                                               ^^^^^^^^^^^^^^^^^
        }
    }
}

So, in gpio1, port A controls itself and port B controls gpio2? And how about port B of gpio0?