编写以上程序

好的，以下是一个基于STM32F103C8T6开发板的程序示例：

#include "stm32f10x.h"
#include "delay.h"
#include "lcd1602.h"

#define ADC1_DR_Address ((u32)0x4001244C)

u16 ADC_ConvertedValue;

void ADC_Config(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    DMA_DeInit(DMA1_Channel1);
    DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = 1;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    ADC_DeInit(ADC1);
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);
    ADC_DMACmd(ADC1, ENABLE);
    ADC_Cmd(ADC1, ENABLE);

    while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY))
        ;
    ADC_StartCalibration(ADC1);

    while (ADC_GetCalibrationStatus(ADC1) != RESET)
        ;
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

void TIM_Config(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseStructure.TIM_Period = 10000 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    TIM_ARRPreloadConfig(TIM2, ENABLE);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    TIM_Cmd(TIM2, ENABLE);
}

void LED_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        float voltage = ADC_ConvertedValue * 3.3f / 4096.0f;

        char str[16];
        sprintf(str, "Voltage: %.2fV", voltage);
        LCD_Clear();
        LCD_WriteString(0, 0, str);

        if (voltage >= 3.0f)
        {
            GPIO_SetBits(GPIOC, GPIO_Pin_13);
            delay_ms(200);
            GPIO_ResetBits(GPIOC, GPIO_Pin_13);
            delay_ms(200);
        }
    }
}

int main(void)
{
    LCD_Init();
    ADC_Config();
    TIM_Config();
    LED_Config();

    while (1)
        ;
}

上述代码中，我们使用了STM32F10x标准库提供的ADC、DMA、TIM、GPIO和NVIC等库函数，实现了以下功能：

1. 初始化LCD显示屏、ADC采集通道、定时器和LED灯等硬件资源；
2. 在定时器中断中读取ADC采集值，并将其转换为实际电压值；
3. 将电压值显示在LCD显示屏上；
4. 判断电压值是否超过3V，如果超过则让LED灯闪烁报警。

注意，上述代码中使用了一些自定义的库函数，如"LCD_Init"、"LCD_WriteString"和"delay_ms"等，需要您根据自己的实际情况进行相应的修改或实现。