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targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 50:a417edff4437
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 2 | * @file analogin_api.c |
bogdanm | 0:9b334a45a8ff | 3 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 4 | * @section License |
bogdanm | 0:9b334a45a8ff | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
bogdanm | 0:9b334a45a8ff | 6 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 7 | * |
bogdanm | 0:9b334a45a8ff | 8 | * Permission is granted to anyone to use this software for any purpose, |
bogdanm | 0:9b334a45a8ff | 9 | * including commercial applications, and to alter it and redistribute it |
bogdanm | 0:9b334a45a8ff | 10 | * freely, subject to the following restrictions: |
bogdanm | 0:9b334a45a8ff | 11 | * |
bogdanm | 0:9b334a45a8ff | 12 | * 1. The origin of this software must not be misrepresented; you must not |
bogdanm | 0:9b334a45a8ff | 13 | * claim that you wrote the original software. |
bogdanm | 0:9b334a45a8ff | 14 | * 2. Altered source versions must be plainly marked as such, and must not be |
bogdanm | 0:9b334a45a8ff | 15 | * misrepresented as being the original software. |
bogdanm | 0:9b334a45a8ff | 16 | * 3. This notice may not be removed or altered from any source distribution. |
bogdanm | 0:9b334a45a8ff | 17 | * |
bogdanm | 0:9b334a45a8ff | 18 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no |
bogdanm | 0:9b334a45a8ff | 19 | * obligation to support this Software. Silicon Labs is providing the |
bogdanm | 0:9b334a45a8ff | 20 | * Software "AS IS", with no express or implied warranties of any kind, |
bogdanm | 0:9b334a45a8ff | 21 | * including, but not limited to, any implied warranties of merchantability |
bogdanm | 0:9b334a45a8ff | 22 | * or fitness for any particular purpose or warranties against infringement |
bogdanm | 0:9b334a45a8ff | 23 | * of any proprietary rights of a third party. |
bogdanm | 0:9b334a45a8ff | 24 | * |
bogdanm | 0:9b334a45a8ff | 25 | * Silicon Labs will not be liable for any consequential, incidental, or |
bogdanm | 0:9b334a45a8ff | 26 | * special damages, or any other relief, or for any claim by any third party, |
bogdanm | 0:9b334a45a8ff | 27 | * arising from your use of this Software. |
bogdanm | 0:9b334a45a8ff | 28 | * |
bogdanm | 0:9b334a45a8ff | 29 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 30 | |
bogdanm | 0:9b334a45a8ff | 31 | #include "device.h" |
bogdanm | 0:9b334a45a8ff | 32 | #if DEVICE_ANALOGIN |
bogdanm | 0:9b334a45a8ff | 33 | |
bogdanm | 0:9b334a45a8ff | 34 | #include "mbed_assert.h" |
bogdanm | 0:9b334a45a8ff | 35 | #include "analogin_api.h" |
bogdanm | 0:9b334a45a8ff | 36 | |
bogdanm | 0:9b334a45a8ff | 37 | #include "pinmap.h" |
bogdanm | 0:9b334a45a8ff | 38 | #include "pinmap_function.h" |
bogdanm | 0:9b334a45a8ff | 39 | #include "PeripheralPins.h" |
bogdanm | 0:9b334a45a8ff | 40 | |
bogdanm | 0:9b334a45a8ff | 41 | #include "em_adc.h" |
bogdanm | 0:9b334a45a8ff | 42 | #include "em_cmu.h" |
bogdanm | 0:9b334a45a8ff | 43 | |
bogdanm | 0:9b334a45a8ff | 44 | uint8_t analogin_get_index(analogin_t *obj) |
bogdanm | 0:9b334a45a8ff | 45 | { |
bogdanm | 0:9b334a45a8ff | 46 | return 0; //only one module availalbe |
bogdanm | 0:9b334a45a8ff | 47 | } |
bogdanm | 0:9b334a45a8ff | 48 | |
bogdanm | 0:9b334a45a8ff | 49 | void analogin_preinit(analogin_t *obj, PinName pin) |
bogdanm | 0:9b334a45a8ff | 50 | { |
bogdanm | 0:9b334a45a8ff | 51 | obj->adc = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC); |
bogdanm | 0:9b334a45a8ff | 52 | MBED_ASSERT((int) obj->adc != NC); |
bogdanm | 0:9b334a45a8ff | 53 | |
bogdanm | 0:9b334a45a8ff | 54 | obj->channel = pin_location(pin, PinMap_ADC); |
bogdanm | 0:9b334a45a8ff | 55 | MBED_ASSERT((int) obj->channel != NC); |
bogdanm | 0:9b334a45a8ff | 56 | } |
bogdanm | 0:9b334a45a8ff | 57 | |
bogdanm | 0:9b334a45a8ff | 58 | void analogin_init(analogin_t *obj, PinName pin) |
bogdanm | 0:9b334a45a8ff | 59 | { |
bogdanm | 0:9b334a45a8ff | 60 | static uint8_t adc_initialized = 0; |
bogdanm | 0:9b334a45a8ff | 61 | |
bogdanm | 0:9b334a45a8ff | 62 | /* Init structure */ |
bogdanm | 0:9b334a45a8ff | 63 | analogin_preinit(obj, pin); |
bogdanm | 0:9b334a45a8ff | 64 | |
bogdanm | 0:9b334a45a8ff | 65 | /* Only initialize the ADC once */ |
bogdanm | 0:9b334a45a8ff | 66 | if (!adc_initialized) { |
bogdanm | 0:9b334a45a8ff | 67 | /* Turn on the clock */ |
bogdanm | 0:9b334a45a8ff | 68 | CMU_ClockEnable(cmuClock_ADC0, true); |
bogdanm | 0:9b334a45a8ff | 69 | |
bogdanm | 0:9b334a45a8ff | 70 | /* Init with default settings */ |
bogdanm | 0:9b334a45a8ff | 71 | ADC_Init_TypeDef init = ADC_INIT_DEFAULT; |
bogdanm | 0:9b334a45a8ff | 72 | init.prescale = 4; |
bogdanm | 0:9b334a45a8ff | 73 | ADC_Init(obj->adc, &init); |
bogdanm | 0:9b334a45a8ff | 74 | |
bogdanm | 0:9b334a45a8ff | 75 | /* Init for single conversion use */ |
bogdanm | 0:9b334a45a8ff | 76 | ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT; |
bogdanm | 0:9b334a45a8ff | 77 | |
bogdanm | 0:9b334a45a8ff | 78 | /* Measure input channel with Vdd reference. */ |
bogdanm | 0:9b334a45a8ff | 79 | singleInit.reference = adcRefVDD; |
bogdanm | 0:9b334a45a8ff | 80 | singleInit.resolution = adcRes12Bit; |
bogdanm | 0:9b334a45a8ff | 81 | singleInit.acqTime = adcAcqTime32; |
bogdanm | 0:9b334a45a8ff | 82 | |
bogdanm | 0:9b334a45a8ff | 83 | ADC_InitSingle(obj->adc, &singleInit); |
bogdanm | 0:9b334a45a8ff | 84 | |
bogdanm | 0:9b334a45a8ff | 85 | adc_initialized = 1; |
bogdanm | 0:9b334a45a8ff | 86 | } |
bogdanm | 0:9b334a45a8ff | 87 | } |
bogdanm | 0:9b334a45a8ff | 88 | |
bogdanm | 0:9b334a45a8ff | 89 | void analogin_enable(analogin_t *obj, uint8_t enable) |
bogdanm | 0:9b334a45a8ff | 90 | { |
bogdanm | 0:9b334a45a8ff | 91 | //not avail for EFM32 |
bogdanm | 0:9b334a45a8ff | 92 | } |
bogdanm | 0:9b334a45a8ff | 93 | |
bogdanm | 0:9b334a45a8ff | 94 | void analogin_enable_pins(analogin_t *obj, uint8_t enable) |
bogdanm | 0:9b334a45a8ff | 95 | { |
bogdanm | 0:9b334a45a8ff | 96 | //not avail for EFM32 |
bogdanm | 0:9b334a45a8ff | 97 | } |
bogdanm | 0:9b334a45a8ff | 98 | |
bogdanm | 0:9b334a45a8ff | 99 | void analogin_enable_interrupt(analogin_t *obj, uint32_t address, uint8_t enable) |
bogdanm | 0:9b334a45a8ff | 100 | { |
bogdanm | 0:9b334a45a8ff | 101 | NVIC_SetVector(ADC0_IRQn, address); |
bogdanm | 0:9b334a45a8ff | 102 | if (enable) { |
bogdanm | 0:9b334a45a8ff | 103 | // enable end of conversion interrupt |
bogdanm | 0:9b334a45a8ff | 104 | ADC_IntEnable(obj->adc, ADC_IEN_SCAN); |
bogdanm | 0:9b334a45a8ff | 105 | ADC_IntSet(obj->adc, ADC_IF_SCAN); |
bogdanm | 0:9b334a45a8ff | 106 | NVIC_EnableIRQ(ADC0_IRQn); |
bogdanm | 0:9b334a45a8ff | 107 | } else { |
bogdanm | 0:9b334a45a8ff | 108 | ADC_IntDisable(obj->adc, ADC_IEN_SCAN); |
bogdanm | 0:9b334a45a8ff | 109 | ADC_IntClear(obj->adc, ADC_IF_SCAN); |
bogdanm | 0:9b334a45a8ff | 110 | NVIC_DisableIRQ(ADC0_IRQn); |
bogdanm | 0:9b334a45a8ff | 111 | } |
bogdanm | 0:9b334a45a8ff | 112 | } |
bogdanm | 0:9b334a45a8ff | 113 | |
bogdanm | 0:9b334a45a8ff | 114 | uint16_t analogin_read_u16(analogin_t *obj) |
bogdanm | 0:9b334a45a8ff | 115 | { |
bogdanm | 0:9b334a45a8ff | 116 | ADC_TypeDef *adc = obj->adc; |
bogdanm | 0:9b334a45a8ff | 117 | uint16_t sample = 0; |
bogdanm | 0:9b334a45a8ff | 118 | |
bogdanm | 0:9b334a45a8ff | 119 | //Make sure a single conversion is not in progress |
bogdanm | 0:9b334a45a8ff | 120 | adc->CMD = ADC_CMD_SINGLESTOP; |
bogdanm | 0:9b334a45a8ff | 121 | |
bogdanm | 0:9b334a45a8ff | 122 | // Make sure we are checking the correct channel |
bogdanm | 0:9b334a45a8ff | 123 | adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_INPUTSEL_MASK) | obj->channel; |
bogdanm | 0:9b334a45a8ff | 124 | |
bogdanm | 0:9b334a45a8ff | 125 | ADC_Start(adc, adcStartSingle); |
bogdanm | 0:9b334a45a8ff | 126 | |
bogdanm | 0:9b334a45a8ff | 127 | /* Wait while conversion is active */ |
bogdanm | 0:9b334a45a8ff | 128 | while (adc->STATUS & ADC_STATUS_SINGLEACT); |
bogdanm | 0:9b334a45a8ff | 129 | |
bogdanm | 0:9b334a45a8ff | 130 | /* Get ADC result */ |
bogdanm | 0:9b334a45a8ff | 131 | sample = ADC_DataSingleGet(adc); |
bogdanm | 0:9b334a45a8ff | 132 | |
bogdanm | 0:9b334a45a8ff | 133 | /* The ADC has 12 bit resolution. We shift in 4 0s */ |
bogdanm | 0:9b334a45a8ff | 134 | /* from the right to make it a 16 bit number as expected */ |
bogdanm | 0:9b334a45a8ff | 135 | return sample << 4; |
bogdanm | 0:9b334a45a8ff | 136 | } |
bogdanm | 0:9b334a45a8ff | 137 | |
bogdanm | 0:9b334a45a8ff | 138 | float analogin_read(analogin_t *obj) |
bogdanm | 0:9b334a45a8ff | 139 | { |
bogdanm | 0:9b334a45a8ff | 140 | /* Convert from a uint16 to a float between 0 and 1 by division by 0xFFFF */ |
bogdanm | 0:9b334a45a8ff | 141 | return analogin_read_u16(obj) / (float) 0xFFFF; |
bogdanm | 0:9b334a45a8ff | 142 | } |
bogdanm | 0:9b334a45a8ff | 143 | |
bogdanm | 0:9b334a45a8ff | 144 | #endif |