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Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c@627:4fa1328d9c60, 2015-09-25 (annotated)

Committer:
mbed_official
Date:
Fri Sep 25 14:15:10 2015 +0100
Revision:
627:4fa1328d9c60
Parent:
548:1abac31e188e 
Synchronized with git revision fe238a91ab7a4d1d72c4cab9da04967c619d54ad



Full URL: https://github.com/mbedmicro/mbed/commit/fe238a91ab7a4d1d72c4cab9da04967c619d54ad/



Silicon Labs - Add support for low-power async Serial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 627:4fa1328d9c60 1 /***************************************************************************//**
mbed_official 627:4fa1328d9c60 2 * @file analogin_api.c
mbed_official 627:4fa1328d9c60 3 *******************************************************************************
mbed_official 627:4fa1328d9c60 4 * @section License
mbed_official 627:4fa1328d9c60 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
mbed_official 627:4fa1328d9c60 6 *******************************************************************************
mbed_official 525:c320967f86b9 7 *
mbed_official 627:4fa1328d9c60 8 * Permission is granted to anyone to use this software for any purpose,
mbed_official 627:4fa1328d9c60 9 * including commercial applications, and to alter it and redistribute it
mbed_official 627:4fa1328d9c60 10 * freely, subject to the following restrictions:
mbed_official 525:c320967f86b9 11 *
mbed_official 627:4fa1328d9c60 12 * 1. The origin of this software must not be misrepresented; you must not
mbed_official 627:4fa1328d9c60 13 * claim that you wrote the original software.
mbed_official 627:4fa1328d9c60 14 * 2. Altered source versions must be plainly marked as such, and must not be
mbed_official 627:4fa1328d9c60 15 * misrepresented as being the original software.
mbed_official 627:4fa1328d9c60 16 * 3. This notice may not be removed or altered from any source distribution.
mbed_official 525:c320967f86b9 17 *
mbed_official 627:4fa1328d9c60 18 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
mbed_official 627:4fa1328d9c60 19 * obligation to support this Software. Silicon Labs is providing the
mbed_official 627:4fa1328d9c60 20 * Software "AS IS", with no express or implied warranties of any kind,
mbed_official 627:4fa1328d9c60 21 * including, but not limited to, any implied warranties of merchantability
mbed_official 627:4fa1328d9c60 22 * or fitness for any particular purpose or warranties against infringement
mbed_official 627:4fa1328d9c60 23 * of any proprietary rights of a third party.
mbed_official 627:4fa1328d9c60 24 *
mbed_official 627:4fa1328d9c60 25 * Silicon Labs will not be liable for any consequential, incidental, or
mbed_official 627:4fa1328d9c60 26 * special damages, or any other relief, or for any claim by any third party,
mbed_official 627:4fa1328d9c60 27 * arising from your use of this Software.
mbed_official 627:4fa1328d9c60 28 *
mbed_official 627:4fa1328d9c60 29 ******************************************************************************/
mbed_official 525:c320967f86b9 30
mbed_official 525:c320967f86b9 31 #include "device.h"
mbed_official 525:c320967f86b9 32 #if DEVICE_ANALOGIN
mbed_official 525:c320967f86b9 33
mbed_official 525:c320967f86b9 34 #include "mbed_assert.h"
mbed_official 525:c320967f86b9 35 #include "analogin_api.h"
mbed_official 525:c320967f86b9 36
mbed_official 525:c320967f86b9 37 #include "pinmap.h"
mbed_official 525:c320967f86b9 38 #include "pinmap_function.h"
mbed_official 525:c320967f86b9 39 #include "PeripheralPins.h"
mbed_official 525:c320967f86b9 40
mbed_official 525:c320967f86b9 41 #include "em_adc.h"
mbed_official 525:c320967f86b9 42 #include "em_cmu.h"
mbed_official 525:c320967f86b9 43
mbed_official 525:c320967f86b9 44 uint8_t analogin_get_index(analogin_t *obj)
mbed_official 525:c320967f86b9 45 {
mbed_official 525:c320967f86b9 46 return 0; //only one module availalbe
mbed_official 525:c320967f86b9 47 }
mbed_official 525:c320967f86b9 48
mbed_official 525:c320967f86b9 49 void analogin_preinit(analogin_t *obj, PinName pin)
mbed_official 525:c320967f86b9 50 {
mbed_official 525:c320967f86b9 51 obj->adc = (ADC_TypeDef *) pinmap_peripheral(pin, PinMap_ADC);
mbed_official 525:c320967f86b9 52 MBED_ASSERT((int) obj->adc != NC);
mbed_official 525:c320967f86b9 53
mbed_official 525:c320967f86b9 54 obj->channel = pin_location(pin, PinMap_ADC);
mbed_official 525:c320967f86b9 55 MBED_ASSERT((int) obj->channel != NC);
mbed_official 525:c320967f86b9 56 }
mbed_official 525:c320967f86b9 57
mbed_official 525:c320967f86b9 58 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 525:c320967f86b9 59 {
mbed_official 543:9dba91c44009 60 static uint8_t adc_initialized = 0;
mbed_official 525:c320967f86b9 61
mbed_official 543:9dba91c44009 62 /* Init structure */
mbed_official 543:9dba91c44009 63 analogin_preinit(obj, pin);
mbed_official 525:c320967f86b9 64
mbed_official 543:9dba91c44009 65 /* Only initialize the ADC once */
mbed_official 543:9dba91c44009 66 if (!adc_initialized) {
mbed_official 543:9dba91c44009 67 /* Turn on the clock */
mbed_official 543:9dba91c44009 68 CMU_ClockEnable(cmuClock_ADC0, true);
mbed_official 548:1abac31e188e 69
mbed_official 543:9dba91c44009 70 /* Init with default settings */
mbed_official 543:9dba91c44009 71 ADC_Init_TypeDef init = ADC_INIT_DEFAULT;
mbed_official 543:9dba91c44009 72 init.prescale = 4;
mbed_official 543:9dba91c44009 73 ADC_Init(obj->adc, &init);
mbed_official 548:1abac31e188e 74
mbed_official 543:9dba91c44009 75 /* Init for single conversion use */
mbed_official 543:9dba91c44009 76 ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT;
mbed_official 525:c320967f86b9 77
mbed_official 543:9dba91c44009 78 /* Measure input channel with Vdd reference. */
mbed_official 543:9dba91c44009 79 singleInit.reference = adcRefVDD;
mbed_official 543:9dba91c44009 80 singleInit.resolution = adcRes12Bit;
mbed_official 543:9dba91c44009 81 singleInit.acqTime = adcAcqTime32;
mbed_official 525:c320967f86b9 82
mbed_official 543:9dba91c44009 83 ADC_InitSingle(obj->adc, &singleInit);
mbed_official 548:1abac31e188e 84
mbed_official 543:9dba91c44009 85 adc_initialized = 1;
mbed_official 543:9dba91c44009 86 }
mbed_official 525:c320967f86b9 87 }
mbed_official 525:c320967f86b9 88
mbed_official 525:c320967f86b9 89 void analogin_enable(analogin_t *obj, uint8_t enable)
mbed_official 525:c320967f86b9 90 {
mbed_official 525:c320967f86b9 91 //not avail for EFM32
mbed_official 525:c320967f86b9 92 }
mbed_official 525:c320967f86b9 93
mbed_official 525:c320967f86b9 94 void analogin_enable_pins(analogin_t *obj, uint8_t enable)
mbed_official 525:c320967f86b9 95 {
mbed_official 525:c320967f86b9 96 //not avail for EFM32
mbed_official 525:c320967f86b9 97 }
mbed_official 525:c320967f86b9 98
mbed_official 525:c320967f86b9 99 void analogin_enable_interrupt(analogin_t *obj, uint32_t address, uint8_t enable)
mbed_official 525:c320967f86b9 100 {
mbed_official 525:c320967f86b9 101 NVIC_SetVector(ADC0_IRQn, address);
mbed_official 525:c320967f86b9 102 if (enable) {
mbed_official 525:c320967f86b9 103 // enable end of conversion interrupt
mbed_official 525:c320967f86b9 104 ADC_IntEnable(obj->adc, ADC_IEN_SCAN);
mbed_official 525:c320967f86b9 105 ADC_IntSet(obj->adc, ADC_IF_SCAN);
mbed_official 525:c320967f86b9 106 NVIC_EnableIRQ(ADC0_IRQn);
mbed_official 525:c320967f86b9 107 } else {
mbed_official 525:c320967f86b9 108 ADC_IntDisable(obj->adc, ADC_IEN_SCAN);
mbed_official 525:c320967f86b9 109 ADC_IntClear(obj->adc, ADC_IF_SCAN);
mbed_official 525:c320967f86b9 110 NVIC_DisableIRQ(ADC0_IRQn);
mbed_official 525:c320967f86b9 111 }
mbed_official 525:c320967f86b9 112 }
mbed_official 525:c320967f86b9 113
mbed_official 525:c320967f86b9 114 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 525:c320967f86b9 115 {
mbed_official 525:c320967f86b9 116 ADC_TypeDef *adc = obj->adc;
mbed_official 525:c320967f86b9 117 uint16_t sample = 0;
mbed_official 525:c320967f86b9 118
mbed_official 525:c320967f86b9 119 //Make sure a single conversion is not in progress
mbed_official 525:c320967f86b9 120 adc->CMD = ADC_CMD_SINGLESTOP;
mbed_official 525:c320967f86b9 121
mbed_official 525:c320967f86b9 122 // Make sure we are checking the correct channel
mbed_official 525:c320967f86b9 123 adc->SINGLECTRL = (adc->SINGLECTRL & ~_ADC_SINGLECTRL_INPUTSEL_MASK) | obj->channel;
mbed_official 525:c320967f86b9 124
mbed_official 525:c320967f86b9 125 ADC_Start(adc, adcStartSingle);
mbed_official 525:c320967f86b9 126
mbed_official 525:c320967f86b9 127 /* Wait while conversion is active */
mbed_official 525:c320967f86b9 128 while (adc->STATUS & ADC_STATUS_SINGLEACT);
mbed_official 525:c320967f86b9 129
mbed_official 525:c320967f86b9 130 /* Get ADC result */
mbed_official 525:c320967f86b9 131 sample = ADC_DataSingleGet(adc);
mbed_official 525:c320967f86b9 132
mbed_official 525:c320967f86b9 133 /* The ADC has 12 bit resolution. We shift in 4 0s */
mbed_official 525:c320967f86b9 134 /* from the right to make it a 16 bit number as expected */
mbed_official 525:c320967f86b9 135 return sample << 4;
mbed_official 525:c320967f86b9 136 }
mbed_official 525:c320967f86b9 137
mbed_official 525:c320967f86b9 138 float analogin_read(analogin_t *obj)
mbed_official 525:c320967f86b9 139 {
mbed_official 525:c320967f86b9 140 /* Convert from a uint16 to a float between 0 and 1 by division by 0xFFFF */
mbed_official 525:c320967f86b9 141 return analogin_read_u16(obj) / (float) 0xFFFF;
mbed_official 525:c320967f86b9 142 }
mbed_official 525:c320967f86b9 143
mbed_official 525:c320967f86b9 144 #endif