Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_NXP/TARGET_LPC15XX/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 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 19 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 void analogout_init(dac_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 22 MBED_ASSERT(pin == P0_12);
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29);
<> 144:ef7eb2e8f9f7 25 LPC_SYSCON->PDRUNCFG &= ~(1 << 12);
<> 144:ef7eb2e8f9f7 26 LPC_IOCON->PIO0_12 = 0;
<> 144:ef7eb2e8f9f7 27 LPC_SWM->PINENABLE0 &= ~(1 << 24);
<> 144:ef7eb2e8f9f7 28 LPC_DAC->CTRL = 0;
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 analogout_write_u16(obj, 0);
<> 144:ef7eb2e8f9f7 31 }
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 void analogout_free(dac_t *obj)
<> 144:ef7eb2e8f9f7 34 {
<> 144:ef7eb2e8f9f7 35 LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29);
<> 144:ef7eb2e8f9f7 36 LPC_SWM->PINENABLE0 |= (1 << 24);
<> 144:ef7eb2e8f9f7 37 }
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 static inline void dac_write(int value) {
<> 144:ef7eb2e8f9f7 40 value &= 0xFFF; // 12-bit
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 // Set the DAC output
<> 144:ef7eb2e8f9f7 43 LPC_DAC->VAL = (value << 4);
<> 144:ef7eb2e8f9f7 44 }
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 static inline int dac_read() {
<> 144:ef7eb2e8f9f7 47 return ((LPC_DAC->VAL >> 4) & 0xFFF);
<> 144:ef7eb2e8f9f7 48 }
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 void analogout_write(dac_t *obj, float value) {
<> 144:ef7eb2e8f9f7 51 if (value < 0.0f) {
<> 144:ef7eb2e8f9f7 52 dac_write(0);
<> 144:ef7eb2e8f9f7 53 } else if (value > 1.0f) {
<> 144:ef7eb2e8f9f7 54 dac_write(0xFFF);
<> 144:ef7eb2e8f9f7 55 } else {
<> 144:ef7eb2e8f9f7 56 dac_write((uint32_t)(value * (float)0xFFF));
<> 144:ef7eb2e8f9f7 57 }
<> 144:ef7eb2e8f9f7 58 }
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 void analogout_write_u16(dac_t *obj, uint16_t value) {
<> 144:ef7eb2e8f9f7 61 dac_write(value);
<> 144:ef7eb2e8f9f7 62 }
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 float analogout_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 65 uint32_t value = dac_read();
<> 144:ef7eb2e8f9f7 66 return (float)value * (1.0f / (float)0xFFF);
<> 144:ef7eb2e8f9f7 67 }
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 uint16_t analogout_read_u16(dac_t *obj) {
<> 144:ef7eb2e8f9f7 70 return (uint16_t)dac_read();
<> 144:ef7eb2e8f9f7 71 }