1 /*!
2 * \file adc-board.c
3 *
4 * \brief Target board ADC driver implementation
5 *
6 * \copyright Revised BSD License, see section \ref LICENSE.
7 *
8 * \code
9 * ______ _
10 * / _____) _ | |
11 * ( (____ _____ ____ _| |_ _____ ____| |__
12 * \____ \| ___ | (_ _) ___ |/ ___) _ \
13 * _____) ) ____| | | || |_| ____( (___| | | |
14 * (______/|_____)_|_|_| \__)_____)\____)_| |_|
15 * (C)2013-2017 Semtech
16 *
17 * \endcode
18 *
19 * \author Miguel Luis ( Semtech )
20 *
21 * \author Gregory Cristian ( Semtech )
22 */
23 #include "stm32l0xx.h"
24 #include "board-config.h"
25 #include "adc-board.h"
26
27 ADC_HandleTypeDef AdcHandle;
28
AdcMcuInit(Adc_t * obj,PinNames adcInput)29 void AdcMcuInit( Adc_t *obj, PinNames adcInput )
30 {
31 AdcHandle.Instance = ADC1;
32
33 __HAL_RCC_ADC1_CLK_ENABLE( );
34
35 HAL_ADC_DeInit( &AdcHandle );
36
37 if( adcInput != NC )
38 {
39 GpioInit( &obj->AdcInput, adcInput, PIN_ANALOGIC, PIN_PUSH_PULL, PIN_NO_PULL, 0 );
40 }
41 }
42
AdcMcuConfig(void)43 void AdcMcuConfig( void )
44 {
45 // Configure ADC
46 AdcHandle.Init.OversamplingMode = DISABLE;
47 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
48 AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
49 AdcHandle.Init.SamplingTime = ADC_SAMPLETIME_160CYCLES_5;
50 AdcHandle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
51 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
52 AdcHandle.Init.ContinuousConvMode = DISABLE;
53 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
54 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
55 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
56 AdcHandle.Init.DMAContinuousRequests = DISABLE;
57 AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
58 AdcHandle.Init.Overrun = ADC_OVR_DATA_PRESERVED;
59 AdcHandle.Init.LowPowerAutoWait = DISABLE;
60 AdcHandle.Init.LowPowerFrequencyMode = ENABLE; // To be enabled only if ADC clock < 2.8 MHz
61 AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
62 HAL_ADC_Init( &AdcHandle );
63 }
64
AdcMcuReadChannel(Adc_t * obj,uint32_t channel)65 uint16_t AdcMcuReadChannel( Adc_t *obj, uint32_t channel )
66 {
67 ADC_ChannelConfTypeDef adcConf = { 0 };
68 uint16_t adcData = 0;
69
70 // Enable HSI
71 __HAL_RCC_HSI_ENABLE( );
72
73 // Wait till HSI is ready
74 while( __HAL_RCC_GET_FLAG( RCC_FLAG_HSIRDY ) == RESET )
75 {
76 }
77
78 // Wait the the Vrefint used by adc is set
79 while( __HAL_PWR_GET_FLAG( PWR_FLAG_VREFINTRDY ) == RESET )
80 {
81 }
82
83 __HAL_RCC_ADC1_CLK_ENABLE( );
84
85 // Calibrate ADC if any calibraiton hardware
86 HAL_ADCEx_Calibration_Start( &AdcHandle, ADC_SINGLE_ENDED );
87
88 // Deselects all channels
89 adcConf.Channel = ADC_CHANNEL_MASK;
90 adcConf.Rank = ADC_RANK_NONE;
91 HAL_ADC_ConfigChannel( &AdcHandle, &adcConf );
92
93 // Configure ADC channel
94 adcConf.Channel = channel;
95 adcConf.Rank = ADC_RANK_CHANNEL_NUMBER;
96 HAL_ADC_ConfigChannel( &AdcHandle, &adcConf );
97
98 // Start ADC Software Conversion
99 HAL_ADC_Start( &AdcHandle );
100
101 HAL_ADC_PollForConversion( &AdcHandle, HAL_MAX_DELAY );
102
103 adcData = HAL_ADC_GetValue( &AdcHandle );
104
105 __HAL_ADC_DISABLE( &AdcHandle );
106
107 __HAL_RCC_ADC1_CLK_DISABLE( );
108
109 // Disable HSI
110 __HAL_RCC_HSI_DISABLE( );
111
112 return adcData;
113 }
114
