#include "resets.h"
#include "clock.h"
#include "irq.h"
#include "gpio.h"
#include "uart.h"
#include "timer.h"
#include "stdio.h"
#include "RP2040.h"

#define TIMER_ALARM_ID  TIMER_ALARM_0
#define TIMER_PERIOD_US (1000 * 1000)

struct uart_cfg_s uart_cfg = {
    .baudrate = 6 * 1000 * 1000,
    .mode = UART_MODE_TX_RX,
    .data_bits = UART_DATABITS_8,
    .parity = UART_PARITY_NONE,
    .stop_bits = UART_STOPBITS_1,
    .fifo_enable = ENABLE,
    .tx_fifo_level = UART_FIFO_LEVEL_1_2,
    .rx_fifo_level = UART_FIFO_LEVEL_1_2,
};

void timer_alarm_0_isr(void)
{
    timer_int_clear(TIMER_ALARM_ID);
    timer_alarm_set(TIMER_ALARM_ID, timer_alarm_get(TIMER_ALARM_ID) + TIMER_PERIOD_US);
    printf("time low count = %ld\r\n", timer_count_l_read_raw());
}

int main(void)
{
    reset_unreset_blocks_wait(RESETS_BLOCK_IO_BANK0 | RESETS_BLOCK_PADS_BANK0 | RESETS_BLOCK_UART0 | RESETS_BLOCK_TIMER);
    gpio_init_simple(0, GPIO_FUNC_UART, DISABLE, ENABLE);
    __enable_irq();
    uart_init(UART_ID_0, &uart_cfg);
    printf("timer interrupt example.\r\n");

    irq_init();
    timer_count_write(0);
    timer_alarm_set(TIMER_ALARM_ID, TIMER_PERIOD_US);
    timer_int_enable(TIMER_ALARM_ID);
    irq_attach(TIMER_IRQ_0, timer_alarm_0_isr);
    irq_enable(TIMER_IRQ_0);

    while (1) {

    }

    return 0;
}