/**************************************************************************//**
*
* @copyright (C) 2019 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date            Author       Notes
* 2020-12-12      Wayne        First version
*
******************************************************************************/

#include <rtconfig.h>
#include <rtdevice.h>

#if defined(RT_USING_PIN)
#include <drv_gpio.h>

/* defined the INDICATOR_LED pin: PH2 */
#define INDICATOR_LED  NU_GET_PININDEX(NU_PH, 2)


#define MATRIX_COL_NUM   2
#define MATRIX_ROW_NUM   3

/* defined the KEY_COl_0 pin: PB4 */
#define KEY_COL_0   NU_GET_PININDEX(NU_PB, 4)

/* defined the KEY_COl_1 pin: PB5 */
#define KEY_COL_1   NU_GET_PININDEX(NU_PB, 5)

/* defined the KEY_ROW_0 pin: PF10 */
#define KEY_ROW_0   NU_GET_PININDEX(NU_PF, 10)

/* defined the KEY_ROW_1 pin: PE15 */
#define KEY_ROW_1   NU_GET_PININDEX(NU_PE, 15)

/* defined the KEY_ROW_2 pin: PE14 */
#define KEY_ROW_2   NU_GET_PININDEX(NU_PE, 14)

uint32_t au32KeyMatrix_Col[MATRIX_COL_NUM] = { KEY_COL_0, KEY_COL_1 };
uint32_t au32KeyMatrix_Row[MATRIX_ROW_NUM] = { KEY_ROW_0, KEY_ROW_1, KEY_ROW_2 };

const char *szKeyLabel[] =
{
    "K1",
    "K2",
    "K3",
    "K4",
    "K5",
    "K6"
};

static void nu_key_matrix_cb(void *args)
{
    uint32_t ri = (uint32_t)args;
    int ci;
    for (ci = 0; ci < MATRIX_COL_NUM; ci++)
    {
        /* Find column bit is low. */
        if (!rt_pin_read(au32KeyMatrix_Col[ci]))
        {
            break;
        }
    }
    rt_kprintf("[%d %d] Pressed %s button.\n", ci, ri, szKeyLabel[(ci) + MATRIX_COL_NUM * ri]);
}

static void nu_key_matrix_switch(uint32_t counter)
{
    int i;
    for (i = 0; i < MATRIX_COL_NUM; i++)
    {
        /* set pin value to high */
        rt_pin_write(au32KeyMatrix_Col[i], PIN_HIGH);
    }
    /* set pin value to low */
    rt_pin_write(au32KeyMatrix_Col[counter % MATRIX_COL_NUM], PIN_LOW);
}
#endif

int main(int argc, char **argv)
{
#if defined(RT_USING_PIN)
    uint32_t counter = 1;
    int i = 0;

    for (i = 0; i < MATRIX_ROW_NUM; i++)
    {
        /* set pin mode to input */
        rt_pin_mode(au32KeyMatrix_Row[i], PIN_MODE_INPUT_PULLUP);

        rt_pin_attach_irq(au32KeyMatrix_Row[i], PIN_IRQ_MODE_FALLING, nu_key_matrix_cb, (void *)i);
        rt_pin_irq_enable(au32KeyMatrix_Row[i], PIN_IRQ_ENABLE);
    }

    for (i = 0; i < MATRIX_COL_NUM; i++)
    {
        /* set  pin mode to output */
        rt_pin_mode(au32KeyMatrix_Col[i], PIN_MODE_OUTPUT);
    }

    /* set INDICATOR_LED pin mode to output */
    rt_pin_mode(INDICATOR_LED, PIN_MODE_OUTPUT);

    /* Toggle column pins in key matrix. */
    while (counter++ > 0)
    {
        rt_pin_write(INDICATOR_LED, PIN_HIGH);
        rt_thread_mdelay(200);
        rt_pin_write(INDICATOR_LED, PIN_LOW);
        rt_thread_mdelay(200);
        nu_key_matrix_switch(counter);
    }
#endif

    return 0;
}