stm32, adc, temperature and vbat

I don't Cube, but surely there is a complete example for ADC readout in it?

Start from that, and if it works switch the input channel to the temperature sensor's one.

JW

I use CubeMX to initialise all the ADC channels..

I use a 2 dimensional table to collate the results for oversampling.

16 rows of data and 15 channels of ADC's, the VBat VRef, Temp are the last three in the table...

when the row counter gets to 16, you can sum all the columns for 16bit ADC results...

to start it, before while(1);

HAL_ADC_Start_DMA (&hadc,(uint32_t *)ADC_DMABuffer,ADC_Channels);

the DMA Interrupt,

extern 'C' void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc){

 if(! ADC_ChannelsCounter--){ ADC_ChannelsCounter = ADC_Channels ;
 HAL_ADC_CompleteCycle = true; // signal foreground to process // copy 15 results away now for (int i=0;i<ADC_Channels;i++){ //here add 2nd dimension to the array HAL_ADC_Channel_Buffer [ADC_RowCounter][i] = ADC_DMABuffer[i]; // AVEColumnSum += HAL_ADC_Channel_Buffer [Ave_ADC_RowCounter][Ave_ADC_ChannelCounter]; }
 ADC_RowCounter ++; // for next time through the loop if ( ADC_RowCounter == ADC_RowCount) ADC_RowCounter =0; }}�?�?�?�?�?�?�?�?
ADC_HandleTypeDef hadc;DMA_HandleTypeDef hdma_adc;
/* ADC init function */void MX_ADC_Init(void){ ADC_ChannelConfTypeDef sConfig;
 /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) */ hadc.Instance = ADC1; hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1; hadc.Init.Resolution = ADC_RESOLUTION_12B; hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD; hadc.Init.EOCSelection = ADC_EOC_SEQ_CONV; hadc.Init.LowPowerAutoWait = DISABLE; hadc.Init.LowPowerAutoPowerOff = DISABLE; hadc.Init.ContinuousConvMode = DISABLE; hadc.Init.DiscontinuousConvMode = ENABLE; hadc.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T15_TRGO; hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISINGFALLING; hadc.Init.DMAContinuousRequests = ENABLE; hadc.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; if (HAL_ADC_Init(&hadc) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_0; sConfig.Rank = ADC_RANK_CHANNEL_NUMBER; sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_1; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_2; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_3; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_6; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_7; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_8; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_9; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_10; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_11; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_13; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_14; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_15; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_TEMPSENSOR; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_VREFINT; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
 /**Configure for the selected ADC regular channel to be converted. */ sConfig.Channel = ADC_CHANNEL_VBAT; if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK) { Error_Handler(); }
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?

Hi Denis,

What is your STM32 serie ?

For example, in the case of STM32L4, you can find some examples in

STM32L4 FW package (can be downloaded here:

/external-link.jspa?url=http%3A%2F%2Fwww.st.com%2Fen%2Fembedded-software%2Fstm32cubel4.html

You can find an example here:

Using driver HAL:

STM32Cube_FW_L4_V1.7.0\Projects\STM32L496ZG-Nucleo\Examples\ADC\ADC_Sequencer\

Using driver LL:

STM32Cube_FW_L4_V1.7.0\Projects\STM32L476RG-Nucleo\Examples_LL\ADC\ADC_MultiChannelSingleConversion\

This example shows how to:

- Measure ADC internal channels VrefInt and temperature sensor (channel Vbat can also be added easily)

- Convert ADC raw conversion data into physical value: VrefInt in mV, temperature in degree Celcius.

Additionally, it shows how to calculate board voltage Vref+ (connected to Vdda is most of the case).

Many thanks.