Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_NXP/TARGET_LPC15XX/analogout_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "mbed_assert.h"
elessair 0:f269e3021894 17 #include "analogout_api.h"
elessair 0:f269e3021894 18 #include "cmsis.h"
elessair 0:f269e3021894 19 #include "pinmap.h"
elessair 0:f269e3021894 20
elessair 0:f269e3021894 21 void analogout_init(dac_t *obj, PinName pin) {
elessair 0:f269e3021894 22 MBED_ASSERT(pin == P0_12);
elessair 0:f269e3021894 23
elessair 0:f269e3021894 24 LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29);
elessair 0:f269e3021894 25 LPC_SYSCON->PDRUNCFG &= ~(1 << 12);
elessair 0:f269e3021894 26 LPC_IOCON->PIO0_12 = 0;
elessair 0:f269e3021894 27 LPC_SWM->PINENABLE0 &= ~(1 << 24);
elessair 0:f269e3021894 28 LPC_DAC->CTRL = 0;
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 analogout_write_u16(obj, 0);
elessair 0:f269e3021894 31 }
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 void analogout_free(dac_t *obj)
elessair 0:f269e3021894 34 {
elessair 0:f269e3021894 35 LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29);
elessair 0:f269e3021894 36 LPC_SWM->PINENABLE0 |= (1 << 24);
elessair 0:f269e3021894 37 }
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 static inline void dac_write(int value) {
elessair 0:f269e3021894 40 value &= 0xFFF; // 12-bit
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 // Set the DAC output
elessair 0:f269e3021894 43 LPC_DAC->VAL = (value << 4);
elessair 0:f269e3021894 44 }
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 static inline int dac_read() {
elessair 0:f269e3021894 47 return ((LPC_DAC->VAL >> 4) & 0xFFF);
elessair 0:f269e3021894 48 }
elessair 0:f269e3021894 49
elessair 0:f269e3021894 50 void analogout_write(dac_t *obj, float value) {
elessair 0:f269e3021894 51 if (value < 0.0f) {
elessair 0:f269e3021894 52 dac_write(0);
elessair 0:f269e3021894 53 } else if (value > 1.0f) {
elessair 0:f269e3021894 54 dac_write(0xFFF);
elessair 0:f269e3021894 55 } else {
elessair 0:f269e3021894 56 dac_write((uint32_t)(value * (float)0xFFF));
elessair 0:f269e3021894 57 }
elessair 0:f269e3021894 58 }
elessair 0:f269e3021894 59
elessair 0:f269e3021894 60 void analogout_write_u16(dac_t *obj, uint16_t value) {
elessair 0:f269e3021894 61 dac_write(value);
elessair 0:f269e3021894 62 }
elessair 0:f269e3021894 63
elessair 0:f269e3021894 64 float analogout_read(dac_t *obj) {
elessair 0:f269e3021894 65 uint32_t value = dac_read();
elessair 0:f269e3021894 66 return (float)value * (1.0f / (float)0xFFF);
elessair 0:f269e3021894 67 }
elessair 0:f269e3021894 68
elessair 0:f269e3021894 69 uint16_t analogout_read_u16(dac_t *obj) {
elessair 0:f269e3021894 70 return (uint16_t)dac_read();
elessair 0:f269e3021894 71 }