#include "uart.h"
#include "gd32e23x_usart.h"
#include "gd32e23x_rcu.h"
#include "gd32e23x_gpio.h"
#include "board_config.h"


void uart0_init(void) {
    /* 使能 GPIOA 和 USART0 时钟 */
    rcu_periph_clock_enable(RS485_GPIO_RCU);
    rcu_periph_clock_enable(RS485_RCU);

    /* 配置 PA2 为 USART0_TX，PA3 为 USART0_RX */
    gpio_af_set(RS485_GPIO_PORT, GPIO_AF_1, RS485_TX_PIN | RS485_RX_PIN | RS485_EN_PIN);

    gpio_mode_set(RS485_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, RS485_TX_PIN | RS485_RX_PIN);
    gpio_output_options_set(RS485_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, RS485_TX_PIN | RS485_RX_PIN);

    gpio_mode_set(RS485_GPIO_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, RS485_EN_PIN);
    gpio_output_options_set(RS485_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, RS485_EN_PIN);

    /* 配置波特率、数据位、停止位等 */
    usart_deinit(RS485_PHY);
    usart_baudrate_set(RS485_PHY, RS485_BAUDRATE);
    usart_receive_config(RS485_PHY, USART_RECEIVE_ENABLE);
    usart_transmit_config(RS485_PHY, USART_TRANSMIT_ENABLE);

    usart_driver_assertime_config(RS485_PHY, 0x01);
    usart_driver_deassertime_config(RS485_PHY, 0x01);

    usart_rs485_driver_enable(RS485_PHY);

    usart_enable(RS485_PHY);

    // TODO NVIC
    }

static uart_printf_port_t g_printf_port = UART_PRINTF_USART0;

void uart_set_printf_port(uart_printf_port_t port) {
    g_printf_port = port;
}

// printf 重定向，支持多串口
int __io_putchar(int ch) {
    switch (g_printf_port) {
        case UART_PRINTF_USART0:
            while (usart_flag_get(USART0, USART_FLAG_TBE) == RESET) {}
            usart_data_transmit(USART0, (uint8_t)ch);
            break;
        case UART_PRINTF_USART1:
            while (usart_flag_get(USART1, USART_FLAG_TBE) == RESET) {}
            usart_data_transmit(USART1, (uint8_t)ch);
            break;
        case UART_PRINTF_BOTH:
            while (usart_flag_get(USART0, USART_FLAG_TBE) == RESET) {}
            usart_data_transmit(USART0, (uint8_t)ch);
            while (usart_flag_get(USART1, USART_FLAG_TBE) == RESET) {}
            usart_data_transmit(USART1, (uint8_t)ch);
            break;
        default:
            break;
    }
    return ch;
}