stm32f302r8t6怎么读取adc通道18的值

您可以使用以下代码读取ADC通道18的值：

// 初始化ADC
ADC_InitTypeDef ADC_InitStruct;
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1, &ADC_InitStruct);

// 配置ADC通道18
ADC_ChannelConfTypeDef ADC_ChannelConfStruct;
ADC_ChannelConfStruct.ADC_Channel = ADC_Channel_18;
ADC_ChannelConfStruct.ADC_SampleTime = ADC_SampleTime_480Cycles;
ADC_ChannelConfStruct.ADC_Rank = 1;
ADC_ChannelConfStruct.ADC_Offset = 0;
ADC_ChannelConfStruct.ADC_NbrOfConversion = 1;
ADC_ChannelConfig(ADC1, &ADC_ChannelConfStruct);

// 启动ADC转换
ADC_StartOfConversion(ADC1);

// 等待转换完成
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);

// 读取ADC值
uint16_t adc_value = ADC_GetConversionValue(ADC1);

请注意，您需要根据您的硬件配置和需求进行适当的修改。