mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/hal/TARGET_Freescale/TARGET_KLXX/analogout_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 17 #include "analogout_api.h"
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 20 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 21 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 22
bogdanm 0:9b334a45a8ff 23 #define RANGE_12BIT 0xFFF
bogdanm 0:9b334a45a8ff 24
bogdanm 0:9b334a45a8ff 25 void analogout_init(dac_t *obj, PinName pin) {
bogdanm 0:9b334a45a8ff 26 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
bogdanm 0:9b334a45a8ff 27 MBED_ASSERT(obj->dac != (DACName)NC);
bogdanm 0:9b334a45a8ff 28
bogdanm 0:9b334a45a8ff 29 SIM->SCGC6 |= SIM_SCGC6_DAC0_MASK;
bogdanm 0:9b334a45a8ff 30
bogdanm 0:9b334a45a8ff 31 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
bogdanm 0:9b334a45a8ff 32 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 DAC0->DAT[obj->dac].DATH = 0;
bogdanm 0:9b334a45a8ff 35 DAC0->DAT[obj->dac].DATL = 0;
bogdanm 0:9b334a45a8ff 36
bogdanm 0:9b334a45a8ff 37 DAC0->C1 = DAC_C1_DACBFMD_MASK; // One-Time Scan Mode
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 DAC0->C0 = DAC_C0_DACEN_MASK // Enable
bogdanm 0:9b334a45a8ff 40 | DAC_C0_DACSWTRG_MASK; // Software Trigger
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 pinmap_pinout(pin, PinMap_DAC);
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 analogout_write_u16(obj, 0);
bogdanm 0:9b334a45a8ff 45 }
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 void analogout_free(dac_t *obj) {}
bogdanm 0:9b334a45a8ff 48
bogdanm 0:9b334a45a8ff 49 static inline void dac_write(dac_t *obj, int value) {
bogdanm 0:9b334a45a8ff 50 DAC0->DAT[obj->dac].DATL = (uint8_t)( value & 0xFF);
bogdanm 0:9b334a45a8ff 51 DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
bogdanm 0:9b334a45a8ff 52 }
bogdanm 0:9b334a45a8ff 53
bogdanm 0:9b334a45a8ff 54 static inline int dac_read(dac_t *obj) {
bogdanm 0:9b334a45a8ff 55 return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
bogdanm 0:9b334a45a8ff 56 }
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 void analogout_write(dac_t *obj, float value) {
bogdanm 0:9b334a45a8ff 59 if (value < 0.0) {
bogdanm 0:9b334a45a8ff 60 dac_write(obj, 0);
bogdanm 0:9b334a45a8ff 61 } else if (value > 1.0) {
bogdanm 0:9b334a45a8ff 62 dac_write(obj, RANGE_12BIT);
bogdanm 0:9b334a45a8ff 63 } else {
bogdanm 0:9b334a45a8ff 64 dac_write(obj, value * (float)RANGE_12BIT);
bogdanm 0:9b334a45a8ff 65 }
bogdanm 0:9b334a45a8ff 66 }
bogdanm 0:9b334a45a8ff 67
bogdanm 0:9b334a45a8ff 68 void analogout_write_u16(dac_t *obj, uint16_t value) {
bogdanm 0:9b334a45a8ff 69 dac_write(obj, value >> 4); // 12-bit
bogdanm 0:9b334a45a8ff 70 }
bogdanm 0:9b334a45a8ff 71
bogdanm 0:9b334a45a8ff 72 float analogout_read(dac_t *obj) {
bogdanm 0:9b334a45a8ff 73 uint32_t value = dac_read(obj);
bogdanm 0:9b334a45a8ff 74 return (float)value * (1.0f / (float)RANGE_12BIT);
bogdanm 0:9b334a45a8ff 75 }
bogdanm 0:9b334a45a8ff 76
bogdanm 0:9b334a45a8ff 77 uint16_t analogout_read_u16(dac_t *obj) {
bogdanm 0:9b334a45a8ff 78 uint32_t value = dac_read(obj); // 12-bit
bogdanm 0:9b334a45a8ff 79 return (value << 4) | ((value >> 8) & 0x003F);
bogdanm 0:9b334a45a8ff 80 }