MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_Silicon_Labs/TARGET_EFM32/analogout_api.c@46:b156ef445742, 2017-06-03 (annotated)

Committer:
sahilmgandhi
Date:
Sat Jun 03 00:22:44 2017 +0000
Revision:
46:b156ef445742
Parent:
18:6a4db94011d3 
Final code for internal battlebot competition.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /***************************************************************************//**
sahilmgandhi 18:6a4db94011d3 2 * @file analogout_aoi.c
sahilmgandhi 18:6a4db94011d3 3 *******************************************************************************
sahilmgandhi 18:6a4db94011d3 4 * @section License
sahilmgandhi 18:6a4db94011d3 5 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
sahilmgandhi 18:6a4db94011d3 6 *******************************************************************************
sahilmgandhi 18:6a4db94011d3 7 *
sahilmgandhi 18:6a4db94011d3 8 * SPDX-License-Identifier: Apache-2.0
sahilmgandhi 18:6a4db94011d3 9 *
sahilmgandhi 18:6a4db94011d3 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
sahilmgandhi 18:6a4db94011d3 11 * not use this file except in compliance with the License.
sahilmgandhi 18:6a4db94011d3 12 * You may obtain a copy of the License at
sahilmgandhi 18:6a4db94011d3 13 *
sahilmgandhi 18:6a4db94011d3 14 * http://www.apache.org/licenses/LICENSE-2.0
sahilmgandhi 18:6a4db94011d3 15 *
sahilmgandhi 18:6a4db94011d3 16 * Unless required by applicable law or agreed to in writing, software
sahilmgandhi 18:6a4db94011d3 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
sahilmgandhi 18:6a4db94011d3 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
sahilmgandhi 18:6a4db94011d3 19 * See the License for the specific language governing permissions and
sahilmgandhi 18:6a4db94011d3 20 * limitations under the License.
sahilmgandhi 18:6a4db94011d3 21 *
sahilmgandhi 18:6a4db94011d3 22 ******************************************************************************/
sahilmgandhi 18:6a4db94011d3 23
sahilmgandhi 18:6a4db94011d3 24 #include "device.h"
sahilmgandhi 18:6a4db94011d3 25 #if DEVICE_ANALOGOUT
sahilmgandhi 18:6a4db94011d3 26
sahilmgandhi 18:6a4db94011d3 27 #include "mbed_assert.h"
sahilmgandhi 18:6a4db94011d3 28 #include "mbed_error.h"
sahilmgandhi 18:6a4db94011d3 29 #include "analogout_api.h"
sahilmgandhi 18:6a4db94011d3 30 #include "pinmap.h"
sahilmgandhi 18:6a4db94011d3 31 #include "pinmap_function.h"
sahilmgandhi 18:6a4db94011d3 32 #include "PeripheralPins.h"
sahilmgandhi 18:6a4db94011d3 33 #include "clocking.h"
sahilmgandhi 18:6a4db94011d3 34
sahilmgandhi 18:6a4db94011d3 35 #include "em_dac.h"
sahilmgandhi 18:6a4db94011d3 36 #include "em_cmu.h"
sahilmgandhi 18:6a4db94011d3 37
sahilmgandhi 18:6a4db94011d3 38 static uint8_t dac_initialized = 0;
sahilmgandhi 18:6a4db94011d3 39
sahilmgandhi 18:6a4db94011d3 40 void analogout_init(dac_t *obj, PinName pin)
sahilmgandhi 18:6a4db94011d3 41 {
sahilmgandhi 18:6a4db94011d3 42 /* init in-memory structure */
sahilmgandhi 18:6a4db94011d3 43 obj->dac = (DAC_TypeDef *) pinmap_peripheral(pin, PinMap_DAC);
sahilmgandhi 18:6a4db94011d3 44 MBED_ASSERT((int) obj->dac != NC);
sahilmgandhi 18:6a4db94011d3 45
sahilmgandhi 18:6a4db94011d3 46 obj->channel = pin_location(pin, PinMap_DAC);
sahilmgandhi 18:6a4db94011d3 47 MBED_ASSERT((int) obj->channel != NC);
sahilmgandhi 18:6a4db94011d3 48
sahilmgandhi 18:6a4db94011d3 49 pin_mode(pin, Disabled);
sahilmgandhi 18:6a4db94011d3 50
sahilmgandhi 18:6a4db94011d3 51 if (!dac_initialized) {
sahilmgandhi 18:6a4db94011d3 52 /* Initialize the DAC. Will disable both DAC channels, so should only be done once */
sahilmgandhi 18:6a4db94011d3 53 /* Use default settings */
sahilmgandhi 18:6a4db94011d3 54 CMU_ClockEnable(cmuClock_DAC0, true);
sahilmgandhi 18:6a4db94011d3 55
sahilmgandhi 18:6a4db94011d3 56 DAC_Init_TypeDef init = DAC_INIT_DEFAULT;
sahilmgandhi 18:6a4db94011d3 57
sahilmgandhi 18:6a4db94011d3 58 /* Calculate the DAC clock prescaler value that will result in a DAC clock
sahilmgandhi 18:6a4db94011d3 59 * close to 500kHz. Second parameter is zero. This uses the current HFPERCLK
sahilmgandhi 18:6a4db94011d3 60 * frequency instead of setting a new one. */
sahilmgandhi 18:6a4db94011d3 61 init.prescale = DAC_PrescaleCalc(500000, REFERENCE_FREQUENCY);
sahilmgandhi 18:6a4db94011d3 62
sahilmgandhi 18:6a4db94011d3 63 /* Set reference voltage to VDD */
sahilmgandhi 18:6a4db94011d3 64 init.reference = dacRefVDD;
sahilmgandhi 18:6a4db94011d3 65
sahilmgandhi 18:6a4db94011d3 66 DAC_Init(obj->dac, &init);
sahilmgandhi 18:6a4db94011d3 67 dac_initialized = 1;
sahilmgandhi 18:6a4db94011d3 68 }
sahilmgandhi 18:6a4db94011d3 69 /* Use default channel settings */
sahilmgandhi 18:6a4db94011d3 70 DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT;
sahilmgandhi 18:6a4db94011d3 71 initChannel.enable = true;
sahilmgandhi 18:6a4db94011d3 72 DAC_InitChannel(obj->dac, &initChannel, obj->channel);
sahilmgandhi 18:6a4db94011d3 73 }
sahilmgandhi 18:6a4db94011d3 74
sahilmgandhi 18:6a4db94011d3 75 void analogout_free(dac_t *obj)
sahilmgandhi 18:6a4db94011d3 76 {
sahilmgandhi 18:6a4db94011d3 77 //Reset channel by re-initializing
sahilmgandhi 18:6a4db94011d3 78 DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT;
sahilmgandhi 18:6a4db94011d3 79 initChannel.enable = false;
sahilmgandhi 18:6a4db94011d3 80 DAC_InitChannel(obj->dac, &initChannel, obj->channel);
sahilmgandhi 18:6a4db94011d3 81
sahilmgandhi 18:6a4db94011d3 82 //Check all channels to see if we can disable the DAC completely
sahilmgandhi 18:6a4db94011d3 83 if((DAC0->CH0CTRL & DAC_CH0CTRL_EN) == 0 && (DAC0->CH1CTRL & DAC_CH1CTRL_EN) == 0) {
sahilmgandhi 18:6a4db94011d3 84 CMU_ClockEnable(cmuClock_DAC0, false);
sahilmgandhi 18:6a4db94011d3 85 dac_initialized = 0;
sahilmgandhi 18:6a4db94011d3 86 }
sahilmgandhi 18:6a4db94011d3 87 }
sahilmgandhi 18:6a4db94011d3 88
sahilmgandhi 18:6a4db94011d3 89 static inline void dac_write(dac_t *obj, int value)
sahilmgandhi 18:6a4db94011d3 90 {
sahilmgandhi 18:6a4db94011d3 91 switch (obj->channel) {
sahilmgandhi 18:6a4db94011d3 92 case 0:
sahilmgandhi 18:6a4db94011d3 93 obj->dac->CH0DATA = value;
sahilmgandhi 18:6a4db94011d3 94 break;
sahilmgandhi 18:6a4db94011d3 95 case 1:
sahilmgandhi 18:6a4db94011d3 96 obj->dac->CH1DATA = value;
sahilmgandhi 18:6a4db94011d3 97 break;
sahilmgandhi 18:6a4db94011d3 98 }
sahilmgandhi 18:6a4db94011d3 99 }
sahilmgandhi 18:6a4db94011d3 100
sahilmgandhi 18:6a4db94011d3 101 static inline int dac_read(dac_t *obj)
sahilmgandhi 18:6a4db94011d3 102 {
sahilmgandhi 18:6a4db94011d3 103 switch (obj->channel) {
sahilmgandhi 18:6a4db94011d3 104 case 0:
sahilmgandhi 18:6a4db94011d3 105 return obj->dac->CH0DATA;
sahilmgandhi 18:6a4db94011d3 106 break;
sahilmgandhi 18:6a4db94011d3 107 case 1:
sahilmgandhi 18:6a4db94011d3 108 return obj->dac->CH1DATA;
sahilmgandhi 18:6a4db94011d3 109 break;
sahilmgandhi 18:6a4db94011d3 110 default:
sahilmgandhi 18:6a4db94011d3 111 error("AnalogOut pin error. Invalid channel");
sahilmgandhi 18:6a4db94011d3 112 return -1;
sahilmgandhi 18:6a4db94011d3 113 break;
sahilmgandhi 18:6a4db94011d3 114 }
sahilmgandhi 18:6a4db94011d3 115 }
sahilmgandhi 18:6a4db94011d3 116
sahilmgandhi 18:6a4db94011d3 117 void analogout_write(dac_t *obj, float value)
sahilmgandhi 18:6a4db94011d3 118 {
sahilmgandhi 18:6a4db94011d3 119 /* We multiply the float value with 0xFFF because the DAC has 12-bit resolution.
sahilmgandhi 18:6a4db94011d3 120 * Ie. accepts values between 0 and 0xFFF (4096). */
sahilmgandhi 18:6a4db94011d3 121 dac_write(obj, value*0xFFF);
sahilmgandhi 18:6a4db94011d3 122 }
sahilmgandhi 18:6a4db94011d3 123
sahilmgandhi 18:6a4db94011d3 124 void analogout_write_u16(dac_t *obj, uint16_t value)
sahilmgandhi 18:6a4db94011d3 125 {
sahilmgandhi 18:6a4db94011d3 126 /* The DAC has 12 bit resolution, so we remove the 4 least significant bits */
sahilmgandhi 18:6a4db94011d3 127 dac_write(obj, value >> 4);
sahilmgandhi 18:6a4db94011d3 128 }
sahilmgandhi 18:6a4db94011d3 129
sahilmgandhi 18:6a4db94011d3 130 float analogout_read(dac_t *obj)
sahilmgandhi 18:6a4db94011d3 131 {
sahilmgandhi 18:6a4db94011d3 132 /* dac_read returns a number between 0 and 0xFFF. Division gives us a float between 0 and 1 */
sahilmgandhi 18:6a4db94011d3 133 return dac_read(obj)/(float)0xFFF;
sahilmgandhi 18:6a4db94011d3 134 }
sahilmgandhi 18:6a4db94011d3 135
sahilmgandhi 18:6a4db94011d3 136 uint16_t analogout_read_u16(dac_t *obj)
sahilmgandhi 18:6a4db94011d3 137 {
sahilmgandhi 18:6a4db94011d3 138 /* dac_read returns a number with 12 significant digits,
sahilmgandhi 18:6a4db94011d3 139 * so we shift in 0s from right to make it a 16 bit number */
sahilmgandhi 18:6a4db94011d3 140 return dac_read(obj) << 4;
sahilmgandhi 18:6a4db94011d3 141 }
sahilmgandhi 18:6a4db94011d3 142
sahilmgandhi 18:6a4db94011d3 143 #endif