Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_Freescale/TARGET_KLXX/analogout_api.c@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
149:156823d33999 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 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 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 17 #include "analogout_api.h"
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 20 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 21 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 #define RANGE_12BIT 0xFFF
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 void analogout_init(dac_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 26 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 27 MBED_ASSERT(obj->dac != (DACName)NC);
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 SIM->SCGC6 |= SIM_SCGC6_DAC0_MASK;
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
<> 144:ef7eb2e8f9f7 32 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 DAC0->DAT[obj->dac].DATH = 0;
<> 144:ef7eb2e8f9f7 35 DAC0->DAT[obj->dac].DATL = 0;
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 DAC0->C1 = DAC_C1_DACBFMD_MASK; // One-Time Scan Mode
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 DAC0->C0 = DAC_C0_DACEN_MASK // Enable
<> 144:ef7eb2e8f9f7 40 | DAC_C0_DACSWTRG_MASK; // Software Trigger
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 pinmap_pinout(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 analogout_write_u16(obj, 0);
<> 144:ef7eb2e8f9f7 45 }
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 void analogout_free(dac_t *obj) {}
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 static inline void dac_write(dac_t *obj, int value) {
<> 144:ef7eb2e8f9f7 50 DAC0->DAT[obj->dac].DATL = (uint8_t)( value & 0xFF);
<> 144:ef7eb2e8f9f7 51 DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
<> 144:ef7eb2e8f9f7 52 }
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 static inline int dac_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 55 return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
<> 144:ef7eb2e8f9f7 56 }
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 void analogout_write(dac_t *obj, float value) {
<> 144:ef7eb2e8f9f7 59 if (value < 0.0) {
<> 144:ef7eb2e8f9f7 60 dac_write(obj, 0);
<> 144:ef7eb2e8f9f7 61 } else if (value > 1.0) {
<> 144:ef7eb2e8f9f7 62 dac_write(obj, RANGE_12BIT);
<> 144:ef7eb2e8f9f7 63 } else {
<> 144:ef7eb2e8f9f7 64 dac_write(obj, value * (float)RANGE_12BIT);
<> 144:ef7eb2e8f9f7 65 }
<> 144:ef7eb2e8f9f7 66 }
<> 144:ef7eb2e8f9f7 67
<> 144:ef7eb2e8f9f7 68 void analogout_write_u16(dac_t *obj, uint16_t value) {
<> 144:ef7eb2e8f9f7 69 dac_write(obj, value >> 4); // 12-bit
<> 144:ef7eb2e8f9f7 70 }
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 float analogout_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 73 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 74 return (float)value * (1.0f / (float)RANGE_12BIT);
<> 144:ef7eb2e8f9f7 75 }
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 uint16_t analogout_read_u16(dac_t *obj) {
<> 144:ef7eb2e8f9f7 78 uint32_t value = dac_read(obj); // 12-bit
<> 144:ef7eb2e8f9f7 79 return (value << 4) | ((value >> 8) & 0x003F);
<> 144:ef7eb2e8f9f7 80 }