Kev Mann / mbed-dev-OS5_10_4

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targets/TARGET_Freescale/TARGET_KLXX/analogout_api.c@0:38ceb79fef03, 2018-11-28 (annotated)

Committer:
kevman
Date:
Wed Nov 28 15:10:15 2018 +0000
Revision:
0:38ceb79fef03
RTC modified

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevman 0:38ceb79fef03 1 /* mbed Microcontroller Library
kevman 0:38ceb79fef03 2 * Copyright (c) 2006-2013 ARM Limited
kevman 0:38ceb79fef03 3 *
kevman 0:38ceb79fef03 4 * Licensed under the Apache License, Version 2.0 (the "License");
kevman 0:38ceb79fef03 5 * you may not use this file except in compliance with the License.
kevman 0:38ceb79fef03 6 * You may obtain a copy of the License at
kevman 0:38ceb79fef03 7 *
kevman 0:38ceb79fef03 8 * http://www.apache.org/licenses/LICENSE-2.0
kevman 0:38ceb79fef03 9 *
kevman 0:38ceb79fef03 10 * Unless required by applicable law or agreed to in writing, software
kevman 0:38ceb79fef03 11 * distributed under the License is distributed on an "AS IS" BASIS,
kevman 0:38ceb79fef03 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kevman 0:38ceb79fef03 13 * See the License for the specific language governing permissions and
kevman 0:38ceb79fef03 14 * limitations under the License.
kevman 0:38ceb79fef03 15 */
kevman 0:38ceb79fef03 16 #include "mbed_assert.h"
kevman 0:38ceb79fef03 17 #include "analogout_api.h"
kevman 0:38ceb79fef03 18
kevman 0:38ceb79fef03 19 #include "cmsis.h"
kevman 0:38ceb79fef03 20 #include "pinmap.h"
kevman 0:38ceb79fef03 21 #include "PeripheralPins.h"
kevman 0:38ceb79fef03 22
kevman 0:38ceb79fef03 23 #define RANGE_12BIT 0xFFF
kevman 0:38ceb79fef03 24
kevman 0:38ceb79fef03 25 void analogout_init(dac_t *obj, PinName pin) {
kevman 0:38ceb79fef03 26 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
kevman 0:38ceb79fef03 27 MBED_ASSERT(obj->dac != (DACName)NC);
kevman 0:38ceb79fef03 28
kevman 0:38ceb79fef03 29 SIM->SCGC6 |= SIM_SCGC6_DAC0_MASK;
kevman 0:38ceb79fef03 30
kevman 0:38ceb79fef03 31 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
kevman 0:38ceb79fef03 32 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
kevman 0:38ceb79fef03 33
kevman 0:38ceb79fef03 34 DAC0->DAT[obj->dac].DATH = 0;
kevman 0:38ceb79fef03 35 DAC0->DAT[obj->dac].DATL = 0;
kevman 0:38ceb79fef03 36
kevman 0:38ceb79fef03 37 DAC0->C1 = DAC_C1_DACBFMD_MASK; // One-Time Scan Mode
kevman 0:38ceb79fef03 38
kevman 0:38ceb79fef03 39 DAC0->C0 = DAC_C0_DACEN_MASK // Enable
kevman 0:38ceb79fef03 40 | DAC_C0_DACSWTRG_MASK; // Software Trigger
kevman 0:38ceb79fef03 41
kevman 0:38ceb79fef03 42 pinmap_pinout(pin, PinMap_DAC);
kevman 0:38ceb79fef03 43
kevman 0:38ceb79fef03 44 analogout_write_u16(obj, 0);
kevman 0:38ceb79fef03 45 }
kevman 0:38ceb79fef03 46
kevman 0:38ceb79fef03 47 void analogout_free(dac_t *obj) {}
kevman 0:38ceb79fef03 48
kevman 0:38ceb79fef03 49 static inline void dac_write(dac_t *obj, int value) {
kevman 0:38ceb79fef03 50 DAC0->DAT[obj->dac].DATL = (uint8_t)( value & 0xFF);
kevman 0:38ceb79fef03 51 DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
kevman 0:38ceb79fef03 52 }
kevman 0:38ceb79fef03 53
kevman 0:38ceb79fef03 54 static inline int dac_read(dac_t *obj) {
kevman 0:38ceb79fef03 55 return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
kevman 0:38ceb79fef03 56 }
kevman 0:38ceb79fef03 57
kevman 0:38ceb79fef03 58 void analogout_write(dac_t *obj, float value) {
kevman 0:38ceb79fef03 59 if (value < 0.0) {
kevman 0:38ceb79fef03 60 dac_write(obj, 0);
kevman 0:38ceb79fef03 61 } else if (value > 1.0) {
kevman 0:38ceb79fef03 62 dac_write(obj, RANGE_12BIT);
kevman 0:38ceb79fef03 63 } else {
kevman 0:38ceb79fef03 64 dac_write(obj, value * (float)RANGE_12BIT);
kevman 0:38ceb79fef03 65 }
kevman 0:38ceb79fef03 66 }
kevman 0:38ceb79fef03 67
kevman 0:38ceb79fef03 68 void analogout_write_u16(dac_t *obj, uint16_t value) {
kevman 0:38ceb79fef03 69 dac_write(obj, value >> 4); // 12-bit
kevman 0:38ceb79fef03 70 }
kevman 0:38ceb79fef03 71
kevman 0:38ceb79fef03 72 float analogout_read(dac_t *obj) {
kevman 0:38ceb79fef03 73 uint32_t value = dac_read(obj);
kevman 0:38ceb79fef03 74 return (float)value * (1.0f / (float)RANGE_12BIT);
kevman 0:38ceb79fef03 75 }
kevman 0:38ceb79fef03 76
kevman 0:38ceb79fef03 77 uint16_t analogout_read_u16(dac_t *obj) {
kevman 0:38ceb79fef03 78 uint32_t value = dac_read(obj); // 12-bit
kevman 0:38ceb79fef03 79 return (value << 4) | ((value >> 8) & 0x003F);
kevman 0:38ceb79fef03 80 }