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 "stm32l4xx.h"
24 #include "board-config.h"
25 #include "adc-board.h"
26
27 //
28 // DEFINED HERE UP UNTIL THE HAL DRIVERS AREN'T UPDATED
29 //
30 /**
31 * @brief Disable the ADC peripheral.
32 * @param __HANDLE__ ADC handle.
33 * @retval None
34 */
35 #define ADC_DISABLE(__HANDLE__) \
36 do{ \
37 (__HANDLE__)->Instance->CR |= ADC_CR_ADDIS; \
38 __HAL_ADC_CLEAR_FLAG((__HANDLE__), (ADC_FLAG_EOSMP | ADC_FLAG_RDY)); \
39 } while(0)
40
41 ADC_HandleTypeDef AdcHandle;
42
AdcMcuInit(Adc_t * obj,PinNames adcInput)43 void AdcMcuInit( Adc_t *obj, PinNames adcInput )
44 {
45 AdcHandle.Instance = ADC1;
46
47 __HAL_RCC_ADC_CLK_ENABLE( );
48
49 HAL_ADC_DeInit( &AdcHandle );
50
51 if( adcInput != NC )
52 {
53 GpioInit( &obj->AdcInput, adcInput, PIN_ANALOGIC, PIN_PUSH_PULL, PIN_NO_PULL, 0 );
54 }
55 }
56
AdcMcuConfig(void)57 void AdcMcuConfig( void )
58 {
59 // Configure ADC
60 AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV1;
61 AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
62 AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
63 AdcHandle.Init.ContinuousConvMode = DISABLE;
64 AdcHandle.Init.DiscontinuousConvMode = DISABLE;
65 AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
66 AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
67 AdcHandle.Init.DMAContinuousRequests = DISABLE;
68 AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
69 AdcHandle.Init.NbrOfConversion = 1;
70 AdcHandle.Init.LowPowerAutoWait = DISABLE;
71 HAL_ADC_Init( &AdcHandle );
72 }
73
AdcMcuReadChannel(Adc_t * obj,uint32_t channel)74 uint16_t AdcMcuReadChannel( Adc_t *obj, uint32_t channel )
75 {
76 ADC_ChannelConfTypeDef adcConf = { 0 };
77 uint16_t adcData = 0;
78
79 // Enable HSI
80 __HAL_RCC_HSI_ENABLE( );
81
82 // Wait till HSI is ready
83 while( __HAL_RCC_GET_FLAG( RCC_FLAG_HSIRDY ) == RESET )
84 {
85 }
86
87 __HAL_RCC_ADC_CLK_ENABLE( );
88
89 // Calibrate ADC if any calibraiton hardware
90 HAL_ADCEx_Calibration_Start( &AdcHandle, ADC_SINGLE_ENDED );
91
92 adcConf.Channel = channel;
93 adcConf.Rank = ADC_REGULAR_RANK_1;
94 adcConf.SamplingTime = ADC_SAMPLETIME_92CYCLES_5;
95
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 ADC_DISABLE( &AdcHandle );
106
107 __HAL_RCC_ADC_CLK_DISABLE( );
108
109 // Disable HSI
110 __HAL_RCC_HSI_DISABLE( );
111
112 return adcData;
113 }
114
