Morpheus / target-freescale-ksdk

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analogout_api.c@0:e4d670b91a9a, 2016-03-23 (annotated)

Committer:
screamer
Date:
Wed Mar 23 21:26:50 2016 +0000
Revision:
0:e4d670b91a9a
Initial revision

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:e4d670b91a9a 1 /* mbed Microcontroller Library
screamer 0:e4d670b91a9a 2 * Copyright (c) 2006-2013 ARM Limited
screamer 0:e4d670b91a9a 3 *
screamer 0:e4d670b91a9a 4 * Licensed under the Apache License, Version 2.0 (the "License");
screamer 0:e4d670b91a9a 5 * you may not use this file except in compliance with the License.
screamer 0:e4d670b91a9a 6 * You may obtain a copy of the License at
screamer 0:e4d670b91a9a 7 *
screamer 0:e4d670b91a9a 8 * http://www.apache.org/licenses/LICENSE-2.0
screamer 0:e4d670b91a9a 9 *
screamer 0:e4d670b91a9a 10 * Unless required by applicable law or agreed to in writing, software
screamer 0:e4d670b91a9a 11 * distributed under the License is distributed on an "AS IS" BASIS,
screamer 0:e4d670b91a9a 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
screamer 0:e4d670b91a9a 13 * See the License for the specific language governing permissions and
screamer 0:e4d670b91a9a 14 * limitations under the License.
screamer 0:e4d670b91a9a 15 */
screamer 0:e4d670b91a9a 16 #include "analogout_api.h"
screamer 0:e4d670b91a9a 17
screamer 0:e4d670b91a9a 18 #if DEVICE_ANALOGOUT
screamer 0:e4d670b91a9a 19
screamer 0:e4d670b91a9a 20 #include "cmsis.h"
screamer 0:e4d670b91a9a 21 #include "pinmap.h"
screamer 0:e4d670b91a9a 22 #include "mbed_error.h"
screamer 0:e4d670b91a9a 23 #include "PeripheralPins.h"
screamer 0:e4d670b91a9a 24 #include "fsl_clock_manager.h"
screamer 0:e4d670b91a9a 25
screamer 0:e4d670b91a9a 26 #define RANGE_12BIT 0xFFF
screamer 0:e4d670b91a9a 27
screamer 0:e4d670b91a9a 28 void analogout_init(dac_t *obj, PinName pin) {
screamer 0:e4d670b91a9a 29 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
screamer 0:e4d670b91a9a 30 if (obj->dac == (DACName)NC) {
screamer 0:e4d670b91a9a 31 error("DAC pin mapping failed");
screamer 0:e4d670b91a9a 32 }
screamer 0:e4d670b91a9a 33
screamer 0:e4d670b91a9a 34 SIM_HAL_EnableDacClock(SIM_BASE, 0);
screamer 0:e4d670b91a9a 35
screamer 0:e4d670b91a9a 36 DAC0->DAT[obj->dac].DATH = 0;
screamer 0:e4d670b91a9a 37 DAC0->DAT[obj->dac].DATL = 0;
screamer 0:e4d670b91a9a 38
screamer 0:e4d670b91a9a 39 DAC0->C1 = DAC_C1_DACBFMD(2); // One-Time Scan Mode
screamer 0:e4d670b91a9a 40
screamer 0:e4d670b91a9a 41 DAC0->C0 = DAC_C0_DACEN_MASK // Enable
screamer 0:e4d670b91a9a 42 | DAC_C0_DACSWTRG_MASK // Software Trigger
screamer 0:e4d670b91a9a 43 | DAC_C0_DACRFS_MASK; // VDDA selected
screamer 0:e4d670b91a9a 44
screamer 0:e4d670b91a9a 45 analogout_write_u16(obj, 0);
screamer 0:e4d670b91a9a 46 }
screamer 0:e4d670b91a9a 47
screamer 0:e4d670b91a9a 48 void analogout_free(dac_t *obj) {}
screamer 0:e4d670b91a9a 49
screamer 0:e4d670b91a9a 50 static inline void dac_write(dac_t *obj, int value) {
screamer 0:e4d670b91a9a 51 DAC0->DAT[obj->dac].DATL = (uint8_t)( value & 0xFF);
screamer 0:e4d670b91a9a 52 DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
screamer 0:e4d670b91a9a 53 }
screamer 0:e4d670b91a9a 54
screamer 0:e4d670b91a9a 55 static inline int dac_read(dac_t *obj) {
screamer 0:e4d670b91a9a 56 return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
screamer 0:e4d670b91a9a 57 }
screamer 0:e4d670b91a9a 58
screamer 0:e4d670b91a9a 59 void analogout_write(dac_t *obj, float value) {
screamer 0:e4d670b91a9a 60 if (value < 0.0f) {
screamer 0:e4d670b91a9a 61 dac_write(obj, 0);
screamer 0:e4d670b91a9a 62 } else if (value > 1.0f) {
screamer 0:e4d670b91a9a 63 dac_write(obj, RANGE_12BIT);
screamer 0:e4d670b91a9a 64 } else {
screamer 0:e4d670b91a9a 65 dac_write(obj, value * (float)RANGE_12BIT);
screamer 0:e4d670b91a9a 66 }
screamer 0:e4d670b91a9a 67 }
screamer 0:e4d670b91a9a 68
screamer 0:e4d670b91a9a 69 void analogout_write_u16(dac_t *obj, uint16_t value) {
screamer 0:e4d670b91a9a 70 dac_write(obj, value >> 4); // 12-bit
screamer 0:e4d670b91a9a 71 }
screamer 0:e4d670b91a9a 72
screamer 0:e4d670b91a9a 73 float analogout_read(dac_t *obj) {
screamer 0:e4d670b91a9a 74 uint32_t value = dac_read(obj);
screamer 0:e4d670b91a9a 75 return (float)value * (1.0f / (float)RANGE_12BIT);
screamer 0:e4d670b91a9a 76 }
screamer 0:e4d670b91a9a 77
screamer 0:e4d670b91a9a 78 uint16_t analogout_read_u16(dac_t *obj) {
screamer 0:e4d670b91a9a 79 uint32_t value = dac_read(obj); // 12-bit
screamer 0:e4d670b91a9a 80 return (value << 4) | ((value >> 8) & 0x003F);
screamer 0:e4d670b91a9a 81 }
screamer 0:e4d670b91a9a 82
screamer 0:e4d670b91a9a 83 #endif