以下是ADC相关初始化代码，得到的电源电压不准确，有时候是3.6V，有时候是3.3V，有时候是1.6V，我是标准3.3V供电的。这个电压不准确，内部温度也就不准确了。是不是初始化有什么问题？
- /*
- ================================================================================
- 描述 : ADC初始化
- 输入 :
- 输出 :
- ================================================================================
- */
- void app_smoke_adc_init(void)
- {
- ADC_InitTypeDef ADC_InitStructure = {0};
-
- __SYSCTRL_GPIOB_CLK_ENABLE();
- PB02_ANALOG_ENABLE();
-
- ADC_InitStructure.ADC_ClkDiv = ADC_Clk_Div8;
- ADC_InitStructure.ADC_ConvertMode = ADC_ConvertMode_Continuous;
- ADC_InitStructure.ADC_IN0.ADC_InputChannel = ADC_InputCH9;
- ADC_InitStructure.ADC_IN0.ADC_SampTime = ADC_SampTime390Clk;//烟雾浓度
- ADC_InitStructure.ADC_IN1.ADC_InputChannel = ADC_InputTs;
- ADC_InitStructure.ADC_IN1.ADC_SampTime = ADC_SampTime390Clk;//内部温度
- ADC_InitStructure.ADC_IN2.ADC_InputChannel = ADC_InputVref1P2;
- ADC_InitStructure.ADC_IN2.ADC_SampTime = ADC_SampTime390Clk; //1.2V基准电压
-
- ADC_InitStructure.ADC_SQREns = ADC_SqrEns0to2;
-
- ADC_Init(&ADC_InitStructure);
- REGBITS_SET(CW_ADC->CR, ADC_CR_BGREN_Msk);//使能BGR
-
- ADC_SetTs(ADC_TsEnable);//使能内部温度
-
- //ADC使能
- ADC_Enable();
- ADC_SoftwareStartConvCmd(ENABLE);
- // g_sAppSmokeWork.adc_flag=true;
- }
- /*
- ================================================================================
- 描述 : ADC检测转换
- 输入 :
- 输出 :
- ================================================================================
- */
- void app_smoke_adc_check(void)
- {
- // static u16 run_cnts=0;
- // if(g_sAppSmokeWork.adc_flag && run_cnts++>500)
- // {
- u16 adc_array[3]={0};
- // ADC_SoftwareStartConvCmd(DISABLE);
-
- ADC_GetSqr0Result(&adc_array[0]);
- ADC_GetSqr1Result(&adc_array[1]);
- ADC_GetSqr2Result(&adc_array[2]);
- // run_cnts=0;
- g_sAppSmokeWork.adc_flag=false;
- for(u8 i=0; i<3; i++)
- {
- printf("adc_%d=%d\n", i, adc_array[i]);
- }
-
- //电源电压计算
- u16 volt_bgr=*((uint16_t*)0x001007D2);//基准电压值
-
- float volt_vcc=volt_bgr*4095.f/adc_array[2]/1000;
- printf("volt_bgr=%.3fV, volt_vcc=%.3fV\n", volt_bgr/1000.f, volt_vcc);
-
- //温度计算
- float temp_val=ADC_GetTs(volt_vcc, adc_array[1]);
- printf("temp_val=%.1f C\n", temp_val);
- // }
- }
串口调试内容
- [08:48:01.767] adc_0=0
- [08:48:01.767] adc_1=912
- [08:48:01.767] adc_2=3062
- [08:48:01.767] volt_bgr=1.199V, volt_vcc=1.603V
- [08:48:01.780] temp_val=-129.9 C
- [08:48:01.780]
- [08:48:04.153] now_rtc_time=1624237630s
- [08:48:04.160]
- [08:48:09.153] now_rtc_time=1624237635s
- [08:48:09.159]
- [08:48:12.193] adc_0=0
- [08:48:12.193] adc_1=913
- [08:48:12.193] adc_2=3064
- [08:48:12.193] volt_bgr=1.199V, volt_vcc=1.602V
- [08:48:12.193] temp_val=-129.9 C
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