sai kiran / mbed-src

Watchdog Timer

Fork of mbed-src by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogout_api.c@628:4fa1328d9c60, 2015-09-25 (annotated)

Committer:
mbed_official
Date:
Fri Sep 25 14:15:10 2015 +0100
Revision:
628:4fa1328d9c60
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 628:4fa1328d9c60 1 /***************************************************************************//**
mbed_official 628:4fa1328d9c60 2 * @file analogout_aoi.c
mbed_official 628:4fa1328d9c60 3 *******************************************************************************
mbed_official 628:4fa1328d9c60 4 * @section License
mbed_official 628:4fa1328d9c60 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
mbed_official 628:4fa1328d9c60 6 *******************************************************************************
mbed_official 525:c320967f86b9 7 *
mbed_official 628:4fa1328d9c60 8 * Permission is granted to anyone to use this software for any purpose,
mbed_official 628:4fa1328d9c60 9 * including commercial applications, and to alter it and redistribute it
mbed_official 628:4fa1328d9c60 10 * freely, subject to the following restrictions:
mbed_official 525:c320967f86b9 11 *
mbed_official 628:4fa1328d9c60 12 * 1. The origin of this software must not be misrepresented; you must not
mbed_official 628:4fa1328d9c60 13 * claim that you wrote the original software.
mbed_official 628:4fa1328d9c60 14 * 2. Altered source versions must be plainly marked as such, and must not be
mbed_official 628:4fa1328d9c60 15 * misrepresented as being the original software.
mbed_official 628:4fa1328d9c60 16 * 3. This notice may not be removed or altered from any source distribution.
mbed_official 525:c320967f86b9 17 *
mbed_official 628:4fa1328d9c60 18 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
mbed_official 628:4fa1328d9c60 19 * obligation to support this Software. Silicon Labs is providing the
mbed_official 628:4fa1328d9c60 20 * Software "AS IS", with no express or implied warranties of any kind,
mbed_official 628:4fa1328d9c60 21 * including, but not limited to, any implied warranties of merchantability
mbed_official 628:4fa1328d9c60 22 * or fitness for any particular purpose or warranties against infringement
mbed_official 628:4fa1328d9c60 23 * of any proprietary rights of a third party.
mbed_official 628:4fa1328d9c60 24 *
mbed_official 628:4fa1328d9c60 25 * Silicon Labs will not be liable for any consequential, incidental, or
mbed_official 628:4fa1328d9c60 26 * special damages, or any other relief, or for any claim by any third party,
mbed_official 628:4fa1328d9c60 27 * arising from your use of this Software.
mbed_official 628:4fa1328d9c60 28 *
mbed_official 628:4fa1328d9c60 29 ******************************************************************************/
mbed_official 525:c320967f86b9 30
mbed_official 525:c320967f86b9 31 #include "device.h"
mbed_official 525:c320967f86b9 32 #if DEVICE_ANALOGOUT
mbed_official 525:c320967f86b9 33
mbed_official 525:c320967f86b9 34 #include "mbed_assert.h"
mbed_official 525:c320967f86b9 35 #include "error.h"
mbed_official 525:c320967f86b9 36 #include "analogout_api.h"
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 543:9dba91c44009 40 #include "clocking.h"
mbed_official 525:c320967f86b9 41
mbed_official 525:c320967f86b9 42 #include "em_dac.h"
mbed_official 525:c320967f86b9 43 #include "em_cmu.h"
mbed_official 525:c320967f86b9 44
mbed_official 525:c320967f86b9 45 uint8_t analogout_get_index(dac_t *obj)
mbed_official 525:c320967f86b9 46 {
mbed_official 525:c320967f86b9 47 return 0;
mbed_official 525:c320967f86b9 48 }
mbed_official 525:c320967f86b9 49
mbed_official 525:c320967f86b9 50 void analogout_preinit(dac_t *obj, PinName pin)
mbed_official 525:c320967f86b9 51 {
mbed_official 525:c320967f86b9 52 obj->dac = (DAC_TypeDef *) pinmap_peripheral(pin, PinMap_DAC);
mbed_official 525:c320967f86b9 53 MBED_ASSERT((int) obj->dac != NC);
mbed_official 548:1abac31e188e 54
mbed_official 525:c320967f86b9 55 obj->channel = pin_location(pin, PinMap_DAC);
mbed_official 525:c320967f86b9 56 MBED_ASSERT((int) obj->channel != NC);
mbed_official 525:c320967f86b9 57 }
mbed_official 525:c320967f86b9 58
mbed_official 548:1abac31e188e 59 void analogout_init(dac_t *obj, PinName pin)
mbed_official 548:1abac31e188e 60 {
mbed_official 543:9dba91c44009 61 static uint8_t dac_initialized = 0;
mbed_official 525:c320967f86b9 62
mbed_official 543:9dba91c44009 63 /* init in-memory structure */
mbed_official 543:9dba91c44009 64 analogout_preinit(obj, pin);
mbed_official 548:1abac31e188e 65
mbed_official 543:9dba91c44009 66 if (!dac_initialized) {
mbed_official 525:c320967f86b9 67 /* Initialize the DAC. Will disable both DAC channels, so should only be done once */
mbed_official 525:c320967f86b9 68 /* Use default settings */
mbed_official 543:9dba91c44009 69 CMU_ClockEnable(cmuClock_DAC0, true);
mbed_official 548:1abac31e188e 70
mbed_official 525:c320967f86b9 71 DAC_Init_TypeDef init = DAC_INIT_DEFAULT;
mbed_official 525:c320967f86b9 72
mbed_official 525:c320967f86b9 73 /* Calculate the DAC clock prescaler value that will result in a DAC clock
mbed_official 525:c320967f86b9 74 * close to 500kHz. Second parameter is zero. This uses the current HFPERCLK
mbed_official 525:c320967f86b9 75 * frequency instead of setting a new one. */
mbed_official 543:9dba91c44009 76 init.prescale = DAC_PrescaleCalc(500000, REFERENCE_FREQUENCY);
mbed_official 525:c320967f86b9 77
mbed_official 525:c320967f86b9 78 /* Set reference voltage to VDD */
mbed_official 525:c320967f86b9 79 init.reference = dacRefVDD;
mbed_official 525:c320967f86b9 80
mbed_official 525:c320967f86b9 81 DAC_Init(obj->dac, &init);
mbed_official 543:9dba91c44009 82 dac_initialized = 1;
mbed_official 525:c320967f86b9 83 }
mbed_official 525:c320967f86b9 84 /* Use default channel settings */
mbed_official 525:c320967f86b9 85 DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT;
mbed_official 525:c320967f86b9 86 DAC_InitChannel(obj->dac, &initChannel, obj->channel);
mbed_official 525:c320967f86b9 87
mbed_official 543:9dba91c44009 88
mbed_official 525:c320967f86b9 89 }
mbed_official 525:c320967f86b9 90
mbed_official 525:c320967f86b9 91 void analogout_enable(dac_t *obj, uint8_t enable)
mbed_official 525:c320967f86b9 92 {
mbed_official 525:c320967f86b9 93 DAC_Enable(obj->dac, obj->channel, enable);
mbed_official 525:c320967f86b9 94 }
mbed_official 525:c320967f86b9 95
mbed_official 525:c320967f86b9 96 void analogout_pins_enable(dac_t *obj, uint8_t enable)
mbed_official 525:c320967f86b9 97 {
mbed_official 525:c320967f86b9 98 //not avail for EFM32
mbed_official 525:c320967f86b9 99 }
mbed_official 525:c320967f86b9 100
mbed_official 548:1abac31e188e 101 static inline void dac_write(dac_t *obj, int value)
mbed_official 548:1abac31e188e 102 {
mbed_official 525:c320967f86b9 103 switch (obj->channel) {
mbed_official 525:c320967f86b9 104 case 0:
mbed_official 525:c320967f86b9 105 obj->dac->CH0DATA = value;
mbed_official 525:c320967f86b9 106 break;
mbed_official 525:c320967f86b9 107 case 1:
mbed_official 525:c320967f86b9 108 obj->dac->CH1DATA = value;
mbed_official 525:c320967f86b9 109 break;
mbed_official 525:c320967f86b9 110 }
mbed_official 525:c320967f86b9 111 }
mbed_official 525:c320967f86b9 112
mbed_official 548:1abac31e188e 113 static inline int dac_read(dac_t *obj)
mbed_official 548:1abac31e188e 114 {
mbed_official 525:c320967f86b9 115 switch (obj->channel) {
mbed_official 525:c320967f86b9 116 case 0:
mbed_official 525:c320967f86b9 117 return obj->dac->CH0DATA;
mbed_official 525:c320967f86b9 118 break;
mbed_official 525:c320967f86b9 119 case 1:
mbed_official 525:c320967f86b9 120 return obj->dac->CH1DATA;
mbed_official 525:c320967f86b9 121 break;
mbed_official 525:c320967f86b9 122 default:
mbed_official 525:c320967f86b9 123 error("AnalogOut pin error. Invalid channel");
mbed_official 525:c320967f86b9 124 return -1;
mbed_official 525:c320967f86b9 125 break;
mbed_official 525:c320967f86b9 126 }
mbed_official 525:c320967f86b9 127 }
mbed_official 525:c320967f86b9 128
mbed_official 548:1abac31e188e 129 void analogout_write(dac_t *obj, float value)
mbed_official 548:1abac31e188e 130 {
mbed_official 525:c320967f86b9 131 /* We multiply the float value with 0xFFF because the DAC has 12-bit resolution.
mbed_official 525:c320967f86b9 132 * Ie. accepts values between 0 and 0xFFF (4096). */
mbed_official 525:c320967f86b9 133 dac_write(obj, value*0xFFF);
mbed_official 525:c320967f86b9 134 }
mbed_official 525:c320967f86b9 135
mbed_official 548:1abac31e188e 136 void analogout_write_u16(dac_t *obj, uint16_t value)
mbed_official 548:1abac31e188e 137 {
mbed_official 525:c320967f86b9 138 /* The DAC has 12 bit resolution, so we remove the 4 least significant bits */
mbed_official 525:c320967f86b9 139 dac_write(obj, value >> 4);
mbed_official 525:c320967f86b9 140 }
mbed_official 525:c320967f86b9 141
mbed_official 548:1abac31e188e 142 float analogout_read(dac_t *obj)
mbed_official 548:1abac31e188e 143 {
mbed_official 525:c320967f86b9 144 /* dac_read returns a number between 0 and 0xFFF. Division gives us a float between 0 and 1 */
mbed_official 525:c320967f86b9 145 return dac_read(obj)/(float)0xFFF;
mbed_official 525:c320967f86b9 146 }
mbed_official 525:c320967f86b9 147
mbed_official 548:1abac31e188e 148 uint16_t analogout_read_u16(dac_t *obj)
mbed_official 548:1abac31e188e 149 {
mbed_official 525:c320967f86b9 150 /* dac_read returns a number with 12 significant digits,
mbed_official 525:c320967f86b9 151 * so we shift in 0s from right to make it a 16 bit number */
mbed_official 525:c320967f86b9 152 return dac_read(obj) << 4;
mbed_official 525:c320967f86b9 153 }
mbed_official 525:c320967f86b9 154
mbed_official 525:c320967f86b9 155 #endif