微控制器没有通过串行线路发送数据，但似乎正在收集数据

问：

我的代码/设置有问题吗？我尝试使用 putty 的终端来查看输出;但是，即使我使用波特率设置等正确配置了它，也没有出现任何数据。不过，我能够在终端中看到“hello world”。 它位于 NUCLEO-F767ZI 微处理器上。我正在使用STM32CubeIDE。

这是我的代码：

#include <stdio.h>
#include <stdlib.h>
#include "stm32f7xx_hal.h"

/* Define your UART handle */
UART_HandleTypeDef huart3;

ADC_HandleTypeDef hadc; // Declare 'hadc' here

void Error_Handler(void) { while (1); }
void SystemClock_Config(void) { /* Configure system clock here */ }

/* Initialize UART */
void init_uart(void) {
    huart3.Instance = USART3;
    huart3.Init.BaudRate = 9600; // Baud rate: 9600 bps
    huart3.Init.WordLength = UART_WORDLENGTH_8B;
    huart3.Init.StopBits = UART_STOPBITS_1; // Stop bits: 1
    huart3.Init.Parity = UART_PARITY_NONE; // Parity: None
    huart3.Init.Mode = UART_MODE_TX_RX;
    huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart3.Init.OverSampling = UART_OVERSAMPLING_16;
    HAL_UART_Init(&huart3);
}

/* Custom implementation of _write for printf redirection */
int _write(int file, char *ptr, int len) {
    HAL_UART_Transmit(&huart3, (uint8_t*)ptr, len, HAL_MAX_DELAY);
    return len;
}

void init_gpio(void) {
    // GPIO initialization code
}

void init_timer(void) {
    // Timer initialization code
}

void init_adc(void) {
    // ADC initialization code
}

int main(void) {
    HAL_Init();
    SystemClock_Config();
    init_uart();
    init_gpio();
    init_timer();
    init_adc();

    uint32_t start_time = 0;
    float input_voltage = 0.0f;

    while (1) {
        printf("Hello World\n");

        start_time = HAL_GetTick(); // Start time for capturing voltage data

        while (HAL_GetTick() - start_time < 5000000) // Capture data for 5 seconds
        {
            // Read data from ADC and process if needed
            // (similar to your previous ADC reading code)

            // Print voltage and time
            HAL_ADC_Start(&hadc); // Declare 'hadc' here
            HAL_ADC_PollForConversion(&hadc, HAL_MAX_DELAY);

            uint32_t adc_value = HAL_ADC_GetValue(&hadc);
            input_voltage = (float)adc_value / 4095.0f * 3.3f;

            HAL_ADC_Stop(&hadc);

            printf("Time: %lu ms, Input Voltage: %.2f V\n", HAL_GetTick() - start_time, input_voltage);

            // No fflush(stdout) here

            HAL_Delay(1); // Delay between voltage measurements
        }

        printf("Measurement done\n"); // Output to indicate end of measurement
    }
}