#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "libmaple.h"
#include "boards.h"
#include "gpio.h"
#include "delay.h"
#include "usart.h"
#include "dma.h"

#define LEV_SENSE_I2C_ADDR  0x55
#define TEMP_SENSE_I2C_ADDR 0x48

#define STR_SIZE 11
uint8 tx_buf[STR_SIZE];

// Force init to be called *first*, i.e. before static object allocation.
// Otherwise, statically allocated objects that need libmaple may fail.
__attribute__((constructor)) void premain() {
    init();
}

static void dma_handler()
{
    dma_disable(DMA1, DMA_CH4);
}

int main(void)
{
    gpio_set_mode(GPIOB, 3, GPIO_OUTPUT_PP);
    gpio_set_mode(GPIOA, 9, GPIO_AF_OUTPUT_PP);
    gpio_set_mode(GPIOA, 10, GPIO_INPUT_FLOATING);

    usart_init(USART1);
    usart_set_baud_rate(USART1, PCLK2, 115200);
    usart_enable(USART1);
    USART1->regs->CR3 |= USART_CR3_DMAT;

    snprintf(tx_buf, STR_SIZE-1, "test dma\r\n");

    dma_init(DMA1);
    dma_mode_flags fl = (DMA_FROM_MEM | DMA_MINC_MODE | DMA_TRNS_CMPLT);
    dma_setup_transfer(DMA1, DMA_CH4, &(USART1->regs->DR), DMA_SIZE_8BITS, tx_buf, DMA_SIZE_8BITS, fl);
    dma_set_num_transfers(DMA1, DMA_CH4, STR_SIZE);
    dma_attach_interrupt(DMA1, DMA_CH4, dma_handler);
    dma_enable(DMA1, DMA_CH4);

    uint8 toggle = 0;
    while(1) {
        if (toggle == 0)
            toggle = 1;
        else
            toggle = 0;
        gpio_write_bit(GPIOB, 3, toggle);
        delay_s(1);
    }

    return 0;
}