帮我写个代码：结合板载的电位器和STM32的AD转换功能，测量电位器两端的电压变化，并通过LED的数量提示AD转化的电压值的大小，电压越大点亮的LED越多。

#include "stm32f4xx.h"
#include <math.h> // 定义ADC外设句柄
ADC_HandleTypeDef hadc1;
// 定义电位器变量
uint32_t potentiometer;
// 定义LED变量
uint32_t led; // 初始化ADC
void ADC_Init(ADC_HandleTypeDef* hadc)
{
// 初始化ADC
ADC_ChannelConfTypeDef sConfig;
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
// 配置ADC通道
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_19CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
} // 初始化LED
void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
} // 主函数
int main(void)
{
// 初始化ADC
ADC_Init(&hadc1);
// 初始化LED
LED_Init();
while (1)
{
// 启动ADC
if (HAL_ADC_Start(&hadc1) != HAL_OK)
{
Error_Handler();
}
// 读取ADC值
if (HAL_ADC_PollForConversion(&hadc1, 10) != HAL_OK)
{
Error_Handler();
}
potentiometer = HAL_ADC_GetValue(&hadc1);
// 计算LED数量
led = lroundf((float)potentiometer*0.01);
// 点亮LED
for (int i = 0; i < led; i++)
{
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1, GPIO_PIN_SET);
}
}
}