reading internal temperature sensor of arch max and storing data
TempBase.cpp@3:e98dbcd4f4e3, 2017-09-14 (annotated)
- Committer:
- tifo
- Date:
- Thu Sep 14 16:44:10 2017 +0000
- Revision:
- 3:e98dbcd4f4e3
- Parent:
- 0:62f36500cd41
another version
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
tifo | 0:62f36500cd41 | 1 | #include "mbed.h" |
tifo | 0:62f36500cd41 | 2 | #include "TempBase.h" |
tifo | 0:62f36500cd41 | 3 | |
tifo | 0:62f36500cd41 | 4 | |
tifo | 0:62f36500cd41 | 5 | TempBase::TempBase() |
tifo | 0:62f36500cd41 | 6 | { |
tifo | 0:62f36500cd41 | 7 | ambientTemp = 25.0f; |
tifo | 0:62f36500cd41 | 8 | v25 = 760.0f; |
tifo | 0:62f36500cd41 | 9 | avgSlope = 2.5f; |
tifo | 0:62f36500cd41 | 10 | vRef = 3000.0f; |
tifo | 0:62f36500cd41 | 11 | } |
tifo | 0:62f36500cd41 | 12 | |
tifo | 0:62f36500cd41 | 13 | |
tifo | 0:62f36500cd41 | 14 | TempBase::TempBase(float correction) |
tifo | 0:62f36500cd41 | 15 | { |
tifo | 0:62f36500cd41 | 16 | ambientTemp = 25.0f + correction; |
tifo | 0:62f36500cd41 | 17 | v25 = 760.0f; |
tifo | 0:62f36500cd41 | 18 | avgSlope = 2.5f; |
tifo | 0:62f36500cd41 | 19 | vRef = 3000.0f; |
tifo | 0:62f36500cd41 | 20 | } |
tifo | 0:62f36500cd41 | 21 | |
tifo | 0:62f36500cd41 | 22 | // ADC init function, call it 1 time during setup |
tifo | 0:62f36500cd41 | 23 | void TempBase::Init() |
tifo | 0:62f36500cd41 | 24 | { |
tifo | 0:62f36500cd41 | 25 | hadc1.Instance = ADC1; |
tifo | 0:62f36500cd41 | 26 | hadc1.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV4; |
tifo | 0:62f36500cd41 | 27 | hadc1.Init.Resolution = ADC_RESOLUTION12b; |
tifo | 0:62f36500cd41 | 28 | hadc1.Init.ScanConvMode = DISABLE; |
tifo | 0:62f36500cd41 | 29 | hadc1.Init.ContinuousConvMode = DISABLE; |
tifo | 0:62f36500cd41 | 30 | hadc1.Init.DiscontinuousConvMode = DISABLE; |
tifo | 0:62f36500cd41 | 31 | hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; |
tifo | 0:62f36500cd41 | 32 | hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; |
tifo | 0:62f36500cd41 | 33 | hadc1.Init.NbrOfConversion = 1; |
tifo | 0:62f36500cd41 | 34 | hadc1.Init.DMAContinuousRequests = DISABLE; |
tifo | 0:62f36500cd41 | 35 | hadc1.Init.EOCSelection = EOC_SINGLE_CONV; |
tifo | 0:62f36500cd41 | 36 | HAL_ADC_Init(&hadc1); |
tifo | 0:62f36500cd41 | 37 | |
tifo | 0:62f36500cd41 | 38 | sConfig.Channel = ADC_CHANNEL_TEMPSENSOR; |
tifo | 0:62f36500cd41 | 39 | sConfig.Rank = 1; |
tifo | 0:62f36500cd41 | 40 | sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES; |
tifo | 0:62f36500cd41 | 41 | |
tifo | 0:62f36500cd41 | 42 | HAL_ADC_ConfigChannel(&hadc1, &sConfig); |
tifo | 0:62f36500cd41 | 43 | } |
tifo | 0:62f36500cd41 | 44 | |
tifo | 0:62f36500cd41 | 45 | // returns raw adc value from sensor |
tifo | 0:62f36500cd41 | 46 | int TempBase::GetRawTemp() |
tifo | 0:62f36500cd41 | 47 | { |
tifo | 0:62f36500cd41 | 48 | HAL_ADC_Start(&hadc1); // Start conversion |
tifo | 0:62f36500cd41 | 49 | |
tifo | 0:62f36500cd41 | 50 | // Wait end of conversion and get value |
tifo | 0:62f36500cd41 | 51 | if (HAL_ADC_PollForConversion(&hadc1, 10) == HAL_OK) |
tifo | 0:62f36500cd41 | 52 | return HAL_ADC_GetValue(&hadc1); |
tifo | 0:62f36500cd41 | 53 | else return -1; |
tifo | 0:62f36500cd41 | 54 | } |
tifo | 0:62f36500cd41 | 55 | |
tifo | 0:62f36500cd41 | 56 | // takes raw value and convert it to temp |
tifo | 0:62f36500cd41 | 57 | float TempBase::ConvertTemp(int value) |
tifo | 0:62f36500cd41 | 58 | { |
tifo | 0:62f36500cd41 | 59 | return (((value * vRef / 0xFFF) - v25) / avgSlope) + ambientTemp; // formula is from manual |
tifo | 0:62f36500cd41 | 60 | } |