John Karatka / mbed

mbed

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targets/TARGET_Freescale/TARGET_K20XX/analogout_api.c@182:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
182:57724642e740
Parent:
149:156823d33999 
mbed-dev library. Release version 159.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2015 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16
<> 144:ef7eb2e8f9f7 17 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 18 #include "analogout_api.h"
<> 144:ef7eb2e8f9f7 19
<> 144:ef7eb2e8f9f7 20 #if DEVICE_ANALOGOUT
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 23 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 24 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 #define RANGE_12BIT 0xFFF
<> 144:ef7eb2e8f9f7 27
<> 144:ef7eb2e8f9f7 28 void analogout_init(dac_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 29 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 30 MBED_ASSERT(obj->dac != (DACName)NC);
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 SIM->SCGC2 |= SIM_SCGC2_DAC0_MASK;
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
<> 144:ef7eb2e8f9f7 35 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 DAC0->DAT[obj->dac].DATH = 0;
<> 144:ef7eb2e8f9f7 38 DAC0->DAT[obj->dac].DATL = 0;
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 DAC0->C1 = DAC_C1_DACBFMD_MASK; // One-Time Scan Mode
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 DAC0->C0 = DAC_C0_DACEN_MASK // Enable
<> 144:ef7eb2e8f9f7 43 | DAC_C0_DACSWTRG_MASK // Software Trigger
<> 144:ef7eb2e8f9f7 44 | DAC_C0_DACRFS_MASK; // VDDA selected
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 analogout_write_u16(obj, 0);
<> 144:ef7eb2e8f9f7 47 }
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 void analogout_free(dac_t *obj) {}
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 static inline void dac_write(dac_t *obj, int value) {
<> 144:ef7eb2e8f9f7 52 DAC0->DAT[obj->dac].DATL = (uint8_t)( value & 0xFF);
<> 144:ef7eb2e8f9f7 53 DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
<> 144:ef7eb2e8f9f7 54 }
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 static inline int dac_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 57 return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
<> 144:ef7eb2e8f9f7 58 }
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 void analogout_write(dac_t *obj, float value) {
<> 144:ef7eb2e8f9f7 61 if (value < 0.0) {
<> 144:ef7eb2e8f9f7 62 dac_write(obj, 0);
<> 144:ef7eb2e8f9f7 63 } else if (value > 1.0) {
<> 144:ef7eb2e8f9f7 64 dac_write(obj, RANGE_12BIT);
<> 144:ef7eb2e8f9f7 65 } else {
<> 144:ef7eb2e8f9f7 66 dac_write(obj, value * (float)RANGE_12BIT);
<> 144:ef7eb2e8f9f7 67 }
<> 144:ef7eb2e8f9f7 68 }
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 void analogout_write_u16(dac_t *obj, uint16_t value) {
<> 144:ef7eb2e8f9f7 71 dac_write(obj, value >> 4); // 12-bit
<> 144:ef7eb2e8f9f7 72 }
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 float analogout_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 75 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 76 return (float)value * (1.0f / (float)RANGE_12BIT);
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 uint16_t analogout_read_u16(dac_t *obj) {
<> 144:ef7eb2e8f9f7 80 uint32_t value = dac_read(obj); // 12-bit
<> 144:ef7eb2e8f9f7 81 return (value << 4) | ((value >> 8) & 0x003F);
<> 144:ef7eb2e8f9f7 82 }
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 #endif