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targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c@50:a417edff4437, 2016-01-15 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Jan 15 07:45:16 2016 +0000
- Revision:
- 50:a417edff4437
- Parent:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
Synchronized with git revision 6010f32619bfcbb01cc73747d4ff9040863482d9
Full URL: https://github.com/mbedmicro/mbed/commit/6010f32619bfcbb01cc73747d4ff9040863482d9/
Remove doubling of buffer size in realiseEndpoint()
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 | |
mbed_official | 50:a417edff4437 | 44 | void analogin_init(analogin_t *obj, PinName pin) |
bogdanm | 0:9b334a45a8ff | 45 | { |
mbed_official | 50:a417edff4437 | 46 | static uint8_t adc_initialized = 0; |
bogdanm | 0:9b334a45a8ff | 47 | |
mbed_official | 50:a417edff4437 | 48 | /* Init structure */ |
bogdanm | 0:9b334a45a8ff | 49 | obj->adc = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC); |
bogdanm | 0:9b334a45a8ff | 50 | MBED_ASSERT((int) obj->adc != NC); |
bogdanm | 0:9b334a45a8ff | 51 | |
bogdanm | 0:9b334a45a8ff | 52 | obj->channel = pin_location(pin, PinMap_ADC); |
bogdanm | 0:9b334a45a8ff | 53 | MBED_ASSERT((int) obj->channel != NC); |
bogdanm | 0:9b334a45a8ff | 54 | |
bogdanm | 0:9b334a45a8ff | 55 | /* Only initialize the ADC once */ |
bogdanm | 0:9b334a45a8ff | 56 | if (!adc_initialized) { |
bogdanm | 0:9b334a45a8ff | 57 | /* Turn on the clock */ |
bogdanm | 0:9b334a45a8ff | 58 | CMU_ClockEnable(cmuClock_ADC0, true); |
bogdanm | 0:9b334a45a8ff | 59 | |
bogdanm | 0:9b334a45a8ff | 60 | /* Init with default settings */ |
bogdanm | 0:9b334a45a8ff | 61 | ADC_Init_TypeDef init = ADC_INIT_DEFAULT; |
bogdanm | 0:9b334a45a8ff | 62 | init.prescale = 4; |
bogdanm | 0:9b334a45a8ff | 63 | ADC_Init(obj->adc, &init); |
bogdanm | 0:9b334a45a8ff | 64 | |
bogdanm | 0:9b334a45a8ff | 65 | /* Init for single conversion use */ |
bogdanm | 0:9b334a45a8ff | 66 | ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT; |
bogdanm | 0:9b334a45a8ff | 67 | |
bogdanm | 0:9b334a45a8ff | 68 | /* Measure input channel with Vdd reference. */ |
bogdanm | 0:9b334a45a8ff | 69 | singleInit.reference = adcRefVDD; |
bogdanm | 0:9b334a45a8ff | 70 | singleInit.resolution = adcRes12Bit; |
bogdanm | 0:9b334a45a8ff | 71 | singleInit.acqTime = adcAcqTime32; |
bogdanm | 0:9b334a45a8ff | 72 | |
bogdanm | 0:9b334a45a8ff | 73 | ADC_InitSingle(obj->adc, &singleInit); |
bogdanm | 0:9b334a45a8ff | 74 | |
bogdanm | 0:9b334a45a8ff | 75 | adc_initialized = 1; |
bogdanm | 0:9b334a45a8ff | 76 | } |
bogdanm | 0:9b334a45a8ff | 77 | } |
bogdanm | 0:9b334a45a8ff | 78 | |
bogdanm | 0:9b334a45a8ff | 79 | uint16_t analogin_read_u16(analogin_t *obj) |
bogdanm | 0:9b334a45a8ff | 80 | { |
bogdanm | 0:9b334a45a8ff | 81 | ADC_TypeDef *adc = obj->adc; |
bogdanm | 0:9b334a45a8ff | 82 | uint16_t sample = 0; |
bogdanm | 0:9b334a45a8ff | 83 | |
bogdanm | 0:9b334a45a8ff | 84 | //Make sure a single conversion is not in progress |
bogdanm | 0:9b334a45a8ff | 85 | adc->CMD = ADC_CMD_SINGLESTOP; |
bogdanm | 0:9b334a45a8ff | 86 | |
bogdanm | 0:9b334a45a8ff | 87 | // Make sure we are checking the correct channel |
mbed_official | 50:a417edff4437 | 88 | #if defined _ADC_SINGLECTRL_INPUTSEL_MASK |
bogdanm | 0:9b334a45a8ff | 89 | adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_INPUTSEL_MASK) | obj->channel; |
mbed_official | 50:a417edff4437 | 90 | #elif _ADC_SINGLECTRL_POSSEL_MASK |
mbed_official | 50:a417edff4437 | 91 | adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_POSSEL_MASK) | obj->channel << _ADC_SINGLECTRL_POSSEL_SHIFT; |
mbed_official | 50:a417edff4437 | 92 | #endif |
bogdanm | 0:9b334a45a8ff | 93 | |
bogdanm | 0:9b334a45a8ff | 94 | ADC_Start(adc, adcStartSingle); |
bogdanm | 0:9b334a45a8ff | 95 | |
bogdanm | 0:9b334a45a8ff | 96 | /* Wait while conversion is active */ |
bogdanm | 0:9b334a45a8ff | 97 | while (adc->STATUS & ADC_STATUS_SINGLEACT); |
bogdanm | 0:9b334a45a8ff | 98 | |
bogdanm | 0:9b334a45a8ff | 99 | /* Get ADC result */ |
bogdanm | 0:9b334a45a8ff | 100 | sample = ADC_DataSingleGet(adc); |
bogdanm | 0:9b334a45a8ff | 101 | |
bogdanm | 0:9b334a45a8ff | 102 | /* The ADC has 12 bit resolution. We shift in 4 0s */ |
bogdanm | 0:9b334a45a8ff | 103 | /* from the right to make it a 16 bit number as expected */ |
bogdanm | 0:9b334a45a8ff | 104 | return sample << 4; |
bogdanm | 0:9b334a45a8ff | 105 | } |
bogdanm | 0:9b334a45a8ff | 106 | |
bogdanm | 0:9b334a45a8ff | 107 | float analogin_read(analogin_t *obj) |
bogdanm | 0:9b334a45a8ff | 108 | { |
bogdanm | 0:9b334a45a8ff | 109 | /* Convert from a uint16 to a float between 0 and 1 by division by 0xFFFF */ |
bogdanm | 0:9b334a45a8ff | 110 | return analogin_read_u16(obj) / (float) 0xFFFF; |
bogdanm | 0:9b334a45a8ff | 111 | } |
bogdanm | 0:9b334a45a8ff | 112 | |
bogdanm | 0:9b334a45a8ff | 113 | #endif |