[11U68]fix P0_11 to use GPIO
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targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c
- Committer:
- mbed_official
- Date:
- 2015-05-20
- Revision:
- 543:9dba91c44009
- Parent:
- 525:c320967f86b9
- Child:
- 548:1abac31e188e
File content as of revision 543:9dba91c44009:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * 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" uint8_t analogin_get_index(analogin_t *obj) { return 0; //only one module availalbe } void analogin_preinit(analogin_t *obj, PinName pin) { 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); } void analogin_init(analogin_t *obj, PinName pin) { static uint8_t adc_initialized = 0; /* Init structure */ analogin_preinit(obj, pin); /* 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; } } void analogin_enable(analogin_t *obj, uint8_t enable) { //not avail for EFM32 } void analogin_enable_pins(analogin_t *obj, uint8_t enable) { //not avail for EFM32 } void analogin_enable_interrupt(analogin_t *obj, uint32_t address, uint8_t enable) { NVIC_SetVector(ADC0_IRQn, address); if (enable) { // enable end of conversion interrupt ADC_IntEnable(obj->adc, ADC_IEN_SCAN); ADC_IntSet(obj->adc, ADC_IF_SCAN); NVIC_EnableIRQ(ADC0_IRQn); } else { ADC_IntDisable(obj->adc, ADC_IEN_SCAN); ADC_IntClear(obj->adc, ADC_IF_SCAN); NVIC_DisableIRQ(ADC0_IRQn); } } 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 adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_INPUTSEL_MASK) | obj->channel; 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