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Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 50:a417edff4437
diff -r 423e1876dc07 -r ef7eb2e8f9f7 targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c --- a/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c Tue Aug 02 14:07:36 2016 +0000 +++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c Fri Sep 02 15:07:44 2016 +0100 @@ -1,113 +1,106 @@ -/***************************************************************************//** - * @file analogin_api.c - ******************************************************************************* - * @section License - * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> - ******************************************************************************* - * - * Permission is granted to anyone to use this software for any purpose, - * including commercial applications, and to alter it and redistribute it - * freely, subject to the following restrictions: - * - * 1. The origin of this software must not be misrepresented; you must not - * claim that you wrote the original software. - * 2. Altered source versions must be plainly marked as such, and must not be - * misrepresented as being the original software. - * 3. This notice may not be removed or altered from any source distribution. - * - * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no - * obligation to support this Software. Silicon Labs is providing the - * Software "AS IS", with no express or implied warranties of any kind, - * including, but not limited to, any implied warranties of merchantability - * or fitness for any particular purpose or warranties against infringement - * of any proprietary rights of a third party. - * - * Silicon Labs will not be liable for any consequential, incidental, or - * special damages, or any other relief, or for any claim by any third party, - * arising from your use of this Software. - * - ******************************************************************************/ - -#include "device.h" -#if DEVICE_ANALOGIN - -#include "mbed_assert.h" -#include "analogin_api.h" - -#include "pinmap.h" -#include "pinmap_function.h" -#include "PeripheralPins.h" - -#include "em_adc.h" -#include "em_cmu.h" - -void analogin_init(analogin_t *obj, PinName pin) -{ - static uint8_t adc_initialized = 0; - - /* Init structure */ - obj->adc = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC); - MBED_ASSERT((int) obj->adc != NC); - - obj->channel = pin_location(pin, PinMap_ADC); - MBED_ASSERT((int) obj->channel != NC); - - /* Only initialize the ADC once */ - if (!adc_initialized) { - /* Turn on the clock */ - CMU_ClockEnable(cmuClock_ADC0, true); - - /* Init with default settings */ - ADC_Init_TypeDef init = ADC_INIT_DEFAULT; - init.prescale = 4; - ADC_Init(obj->adc, &init); - - /* Init for single conversion use */ - ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT; - - /* Measure input channel with Vdd reference. */ - singleInit.reference = adcRefVDD; - singleInit.resolution = adcRes12Bit; - singleInit.acqTime = adcAcqTime32; - - ADC_InitSingle(obj->adc, &singleInit); - - adc_initialized = 1; - } -} - -uint16_t analogin_read_u16(analogin_t *obj) -{ - ADC_TypeDef *adc = obj->adc; - uint16_t sample = 0; - - //Make sure a single conversion is not in progress - adc->CMD = ADC_CMD_SINGLESTOP; - - // Make sure we are checking the correct channel -#if defined _ADC_SINGLECTRL_INPUTSEL_MASK - adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_INPUTSEL_MASK) | obj->channel; -#elif _ADC_SINGLECTRL_POSSEL_MASK - adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_POSSEL_MASK) | obj->channel << _ADC_SINGLECTRL_POSSEL_SHIFT; -#endif - - ADC_Start(adc, adcStartSingle); - - /* Wait while conversion is active */ - while (adc->STATUS & ADC_STATUS_SINGLEACT); - - /* Get ADC result */ - sample = ADC_DataSingleGet(adc); - - /* The ADC has 12 bit resolution. We shift in 4 0s */ - /* from the right to make it a 16 bit number as expected */ - return sample << 4; -} - -float analogin_read(analogin_t *obj) -{ - /* Convert from a uint16 to a float between 0 and 1 by division by 0xFFFF */ - return analogin_read_u16(obj) / (float) 0xFFFF; -} - -#endif +/***************************************************************************//** + * @file analogin_api.c + ******************************************************************************* + * @section License + * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> + ******************************************************************************* + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + ******************************************************************************/ + +#include "device.h" +#if DEVICE_ANALOGIN + +#include "mbed_assert.h" +#include "analogin_api.h" + +#include "pinmap.h" +#include "pinmap_function.h" +#include "PeripheralPins.h" + +#include "em_adc.h" +#include "em_cmu.h" + +void analogin_init(analogin_t *obj, PinName pin) +{ + static uint8_t adc_initialized = 0; + + /* Init structure */ + obj->adc = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC); + MBED_ASSERT((int) obj->adc != NC); + + obj->channel = pin_location(pin, PinMap_ADC); + MBED_ASSERT((int) obj->channel != NC); + + /* Only initialize the ADC once */ + if (!adc_initialized) { + /* Turn on the clock */ + CMU_ClockEnable(cmuClock_ADC0, true); + + /* Init with default settings */ + ADC_Init_TypeDef init = ADC_INIT_DEFAULT; + init.prescale = 4; + ADC_Init(obj->adc, &init); + + /* Init for single conversion use */ + ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT; + + /* Measure input channel with Vdd reference. */ + singleInit.reference = adcRefVDD; + singleInit.resolution = adcRes12Bit; + singleInit.acqTime = adcAcqTime32; + + ADC_InitSingle(obj->adc, &singleInit); + + adc_initialized = 1; + } +} + +uint16_t analogin_read_u16(analogin_t *obj) +{ + ADC_TypeDef *adc = obj->adc; + uint16_t sample = 0; + + //Make sure a single conversion is not in progress + adc->CMD = ADC_CMD_SINGLESTOP; + + // Make sure we are checking the correct channel +#if defined _ADC_SINGLECTRL_INPUTSEL_MASK + adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_INPUTSEL_MASK) | obj->channel; +#elif _ADC_SINGLECTRL_POSSEL_MASK + adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_POSSEL_MASK) | obj->channel << _ADC_SINGLECTRL_POSSEL_SHIFT; +#endif + + ADC_Start(adc, adcStartSingle); + + /* Wait while conversion is active */ + while (adc->STATUS & ADC_STATUS_SINGLEACT); + + /* Get ADC result */ + sample = ADC_DataSingleGet(adc); + + /* The ADC has 12 bit resolution. We shift in 4 0s */ + /* from the right to make it a 16 bit number as expected */ + return sample << 4; +} + +float analogin_read(analogin_t *obj) +{ + /* Convert from a uint16 to a float between 0 and 1 by division by 0xFFFF */ + return analogin_read_u16(obj) / (float) 0xFFFF; +} + +#endif