en 129 / mbed-src

[11U68]fix P0_11 to use GPIO

Fork of mbed-src by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c@543:9dba91c44009, 2015-05-20 (annotated)

Committer:
mbed_official
Date:
Wed May 20 08:45:07 2015 +0100
Revision:
543:9dba91c44009
Parent:
525:c320967f86b9
Child:
548:1abac31e188e
Synchronized with git revision 1f6ad3fbb3fb13007f636ded30764bc5a1d4d362



Full URL: https://github.com/mbedmicro/mbed/commit/1f6ad3fbb3fb13007f636ded30764bc5a1d4d362/



[Silicon Labs] Fix missing clock enable in ADC/DAC

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 525:c320967f86b9 1 /* mbed Microcontroller Library
mbed_official 525:c320967f86b9 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 525:c320967f86b9 3 *
mbed_official 525:c320967f86b9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 525:c320967f86b9 5 * you may not use this file except in compliance with the License.
mbed_official 525:c320967f86b9 6 * You may obtain a copy of the License at
mbed_official 525:c320967f86b9 7 *
mbed_official 525:c320967f86b9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 525:c320967f86b9 9 *
mbed_official 525:c320967f86b9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 525:c320967f86b9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 525:c320967f86b9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 525:c320967f86b9 13 * See the License for the specific language governing permissions and
mbed_official 525:c320967f86b9 14 * limitations under the License.
mbed_official 525:c320967f86b9 15 */
mbed_official 525:c320967f86b9 16
mbed_official 525:c320967f86b9 17 #include "device.h"
mbed_official 525:c320967f86b9 18 #if DEVICE_ANALOGIN
mbed_official 525:c320967f86b9 19
mbed_official 525:c320967f86b9 20 #include "mbed_assert.h"
mbed_official 525:c320967f86b9 21 #include "analogin_api.h"
mbed_official 525:c320967f86b9 22
mbed_official 525:c320967f86b9 23 #include "pinmap.h"
mbed_official 525:c320967f86b9 24 #include "pinmap_function.h"
mbed_official 525:c320967f86b9 25 #include "PeripheralPins.h"
mbed_official 525:c320967f86b9 26
mbed_official 525:c320967f86b9 27 #include "em_adc.h"
mbed_official 525:c320967f86b9 28 #include "em_cmu.h"
mbed_official 525:c320967f86b9 29
mbed_official 525:c320967f86b9 30 uint8_t analogin_get_index(analogin_t *obj)
mbed_official 525:c320967f86b9 31 {
mbed_official 525:c320967f86b9 32 return 0; //only one module availalbe
mbed_official 525:c320967f86b9 33 }
mbed_official 525:c320967f86b9 34
mbed_official 525:c320967f86b9 35 void analogin_preinit(analogin_t *obj, PinName pin)
mbed_official 525:c320967f86b9 36 {
mbed_official 525:c320967f86b9 37 obj->adc = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC);
mbed_official 525:c320967f86b9 38 MBED_ASSERT((int) obj->adc != NC);
mbed_official 525:c320967f86b9 39
mbed_official 525:c320967f86b9 40 obj->channel = pin_location(pin, PinMap_ADC);
mbed_official 525:c320967f86b9 41 MBED_ASSERT((int) obj->channel != NC);
mbed_official 525:c320967f86b9 42 }
mbed_official 525:c320967f86b9 43
mbed_official 525:c320967f86b9 44 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 525:c320967f86b9 45 {
mbed_official 543:9dba91c44009 46 static uint8_t adc_initialized = 0;
mbed_official 525:c320967f86b9 47
mbed_official 543:9dba91c44009 48 /* Init structure */
mbed_official 543:9dba91c44009 49 analogin_preinit(obj, pin);
mbed_official 525:c320967f86b9 50
mbed_official 543:9dba91c44009 51 /* Only initialize the ADC once */
mbed_official 543:9dba91c44009 52 if (!adc_initialized) {
mbed_official 543:9dba91c44009 53 /* Turn on the clock */
mbed_official 543:9dba91c44009 54 CMU_ClockEnable(cmuClock_ADC0, true);
mbed_official 543:9dba91c44009 55
mbed_official 543:9dba91c44009 56 /* Init with default settings */
mbed_official 543:9dba91c44009 57 ADC_Init_TypeDef init = ADC_INIT_DEFAULT;
mbed_official 543:9dba91c44009 58 init.prescale = 4;
mbed_official 543:9dba91c44009 59 ADC_Init(obj->adc, &init);
mbed_official 543:9dba91c44009 60
mbed_official 543:9dba91c44009 61 /* Init for single conversion use */
mbed_official 543:9dba91c44009 62 ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT;
mbed_official 525:c320967f86b9 63
mbed_official 543:9dba91c44009 64 /* Measure input channel with Vdd reference. */
mbed_official 543:9dba91c44009 65 singleInit.reference = adcRefVDD;
mbed_official 543:9dba91c44009 66 singleInit.resolution = adcRes12Bit;
mbed_official 543:9dba91c44009 67 singleInit.acqTime = adcAcqTime32;
mbed_official 525:c320967f86b9 68
mbed_official 543:9dba91c44009 69 ADC_InitSingle(obj->adc, &singleInit);
mbed_official 543:9dba91c44009 70
mbed_official 543:9dba91c44009 71 adc_initialized = 1;
mbed_official 543:9dba91c44009 72 }
mbed_official 525:c320967f86b9 73 }
mbed_official 525:c320967f86b9 74
mbed_official 525:c320967f86b9 75 void analogin_enable(analogin_t *obj, uint8_t enable)
mbed_official 525:c320967f86b9 76 {
mbed_official 525:c320967f86b9 77 //not avail for EFM32
mbed_official 525:c320967f86b9 78 }
mbed_official 525:c320967f86b9 79
mbed_official 525:c320967f86b9 80 void analogin_enable_pins(analogin_t *obj, uint8_t enable)
mbed_official 525:c320967f86b9 81 {
mbed_official 525:c320967f86b9 82 //not avail for EFM32
mbed_official 525:c320967f86b9 83 }
mbed_official 525:c320967f86b9 84
mbed_official 525:c320967f86b9 85 void analogin_enable_interrupt(analogin_t *obj, uint32_t address, uint8_t enable)
mbed_official 525:c320967f86b9 86 {
mbed_official 525:c320967f86b9 87 NVIC_SetVector(ADC0_IRQn, address);
mbed_official 525:c320967f86b9 88 if (enable) {
mbed_official 525:c320967f86b9 89 // enable end of conversion interrupt
mbed_official 525:c320967f86b9 90 ADC_IntEnable(obj->adc, ADC_IEN_SCAN);
mbed_official 525:c320967f86b9 91 ADC_IntSet(obj->adc, ADC_IF_SCAN);
mbed_official 525:c320967f86b9 92 NVIC_EnableIRQ(ADC0_IRQn);
mbed_official 525:c320967f86b9 93 } else {
mbed_official 525:c320967f86b9 94 ADC_IntDisable(obj->adc, ADC_IEN_SCAN);
mbed_official 525:c320967f86b9 95 ADC_IntClear(obj->adc, ADC_IF_SCAN);
mbed_official 525:c320967f86b9 96 NVIC_DisableIRQ(ADC0_IRQn);
mbed_official 525:c320967f86b9 97 }
mbed_official 525:c320967f86b9 98 }
mbed_official 525:c320967f86b9 99
mbed_official 525:c320967f86b9 100 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 525:c320967f86b9 101 {
mbed_official 525:c320967f86b9 102 ADC_TypeDef *adc = obj->adc;
mbed_official 525:c320967f86b9 103 uint16_t sample = 0;
mbed_official 525:c320967f86b9 104
mbed_official 525:c320967f86b9 105 //Make sure a single conversion is not in progress
mbed_official 525:c320967f86b9 106 adc->CMD = ADC_CMD_SINGLESTOP;
mbed_official 525:c320967f86b9 107
mbed_official 525:c320967f86b9 108 // Make sure we are checking the correct channel
mbed_official 525:c320967f86b9 109 adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_INPUTSEL_MASK) | obj->channel;
mbed_official 525:c320967f86b9 110
mbed_official 525:c320967f86b9 111 ADC_Start(adc, adcStartSingle);
mbed_official 525:c320967f86b9 112
mbed_official 525:c320967f86b9 113 /* Wait while conversion is active */
mbed_official 525:c320967f86b9 114 while (adc->STATUS & ADC_STATUS_SINGLEACT);
mbed_official 525:c320967f86b9 115
mbed_official 525:c320967f86b9 116 /* Get ADC result */
mbed_official 525:c320967f86b9 117 sample = ADC_DataSingleGet(adc);
mbed_official 525:c320967f86b9 118
mbed_official 525:c320967f86b9 119 /* The ADC has 12 bit resolution. We shift in 4 0s */
mbed_official 525:c320967f86b9 120 /* from the right to make it a 16 bit number as expected */
mbed_official 525:c320967f86b9 121 return sample << 4;
mbed_official 525:c320967f86b9 122 }
mbed_official 525:c320967f86b9 123
mbed_official 525:c320967f86b9 124 float analogin_read(analogin_t *obj)
mbed_official 525:c320967f86b9 125 {
mbed_official 525:c320967f86b9 126 /* Convert from a uint16 to a float between 0 and 1 by division by 0xFFFF */
mbed_official 525:c320967f86b9 127 return analogin_read_u16(obj) / (float) 0xFFFF;
mbed_official 525:c320967f86b9 128 }
mbed_official 525:c320967f86b9 129
mbed_official 525:c320967f86b9 130 #endif