#include "stm32f1xx_hal.h"
#include <string.h>

UART_HandleTypeDef huart1;

void SystemClock_Config(void);
static void MX_USART1_UART_Init(void);

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_USART1_UART_Init();
    HAL_UART_MspInit(huart1);

    const char msg[] = "Hello, renode!\r\n";
    while (1) {
        HAL_UART_Transmit(&huart1, (uint8_t*)msg, sizeof(msg)-1, HAL_MAX_DELAY);
        HAL_Delay(1000);
    }
}

void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    __HAL_RCC_AFIO_CLK_ENABLE();
    __HAL_RCC_PWR_CLK_ENABLE();

    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;   // 8MHz * 9 = 72MHz
    HAL_RCC_OscConfig(&RCC_OscInitStruct);

    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 72MHz
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;        // 72MHz
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;         // 72MHz
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;         // 36MHz (<=36)
    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);

    __HAL_AFIO_REMAP_SWJ_NOJTAG(); // libera PB3/PB4/PB5 se necessário; opcional
}

static void MX_USART1_UART_Init(void)
{
    huart1.Instance = USART1;
    huart1.Init.BaudRate = 115200;
    huart1.Init.WordLength = UART_WORDLENGTH_8B;
    huart1.Init.StopBits = UART_STOPBITS_1;
    huart1.Init.Parity = UART_PARITY_NONE;
    huart1.Init.Mode = UART_MODE_TX_RX;
    huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart1.Init.OverSampling = UART_OVERSAMPLING_16;
    HAL_UART_Init(&huart1);
}

#include "stm32f1xx_hal.h"

void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{
    if(huart->Instance == USART1) {
        __HAL_RCC_USART1_CLK_ENABLE();
        __HAL_RCC_GPIOA_CLK_ENABLE();

        GPIO_InitTypeDef GPIO_InitStruct = {0};

        // PA9 -> USART1_TX (AF Push-Pull, 50MHz)
        GPIO_InitStruct.Pin = GPIO_PIN_9;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

        // PA10 -> USART1_RX (Input floating)
        GPIO_InitStruct.Pin = GPIO_PIN_10;
        GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
        GPIO_InitStruct.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    }
}