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mbed-os/targets/TARGET_NXP/TARGET_LPC15XX/analogout_api.c@0:02dd72d1d465, 2018-04-24 (annotated)

Committer:
borlanic
Date:
Tue Apr 24 11:45:18 2018 +0000
Revision:
0:02dd72d1d465
BaBoRo_test2 - backup 1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
borlanic 0:02dd72d1d465 1 /* mbed Microcontroller Library
borlanic 0:02dd72d1d465 2 * Copyright (c) 2006-2013 ARM Limited
borlanic 0:02dd72d1d465 3 *
borlanic 0:02dd72d1d465 4 * Licensed under the Apache License, Version 2.0 (the "License");
borlanic 0:02dd72d1d465 5 * you may not use this file except in compliance with the License.
borlanic 0:02dd72d1d465 6 * You may obtain a copy of the License at
borlanic 0:02dd72d1d465 7 *
borlanic 0:02dd72d1d465 8 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:02dd72d1d465 9 *
borlanic 0:02dd72d1d465 10 * Unless required by applicable law or agreed to in writing, software
borlanic 0:02dd72d1d465 11 * distributed under the License is distributed on an "AS IS" BASIS,
borlanic 0:02dd72d1d465 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:02dd72d1d465 13 * See the License for the specific language governing permissions and
borlanic 0:02dd72d1d465 14 * limitations under the License.
borlanic 0:02dd72d1d465 15 */
borlanic 0:02dd72d1d465 16 #include "mbed_assert.h"
borlanic 0:02dd72d1d465 17 #include "analogout_api.h"
borlanic 0:02dd72d1d465 18 #include "cmsis.h"
borlanic 0:02dd72d1d465 19 #include "pinmap.h"
borlanic 0:02dd72d1d465 20
borlanic 0:02dd72d1d465 21 void analogout_init(dac_t *obj, PinName pin) {
borlanic 0:02dd72d1d465 22 MBED_ASSERT(pin == P0_12);
borlanic 0:02dd72d1d465 23
borlanic 0:02dd72d1d465 24 LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29);
borlanic 0:02dd72d1d465 25 LPC_SYSCON->PDRUNCFG &= ~(1 << 12);
borlanic 0:02dd72d1d465 26 LPC_IOCON->PIO0_12 = 0;
borlanic 0:02dd72d1d465 27 LPC_SWM->PINENABLE0 &= ~(1 << 24);
borlanic 0:02dd72d1d465 28 LPC_DAC->CTRL = 0;
borlanic 0:02dd72d1d465 29
borlanic 0:02dd72d1d465 30 analogout_write_u16(obj, 0);
borlanic 0:02dd72d1d465 31 }
borlanic 0:02dd72d1d465 32
borlanic 0:02dd72d1d465 33 void analogout_free(dac_t *obj)
borlanic 0:02dd72d1d465 34 {
borlanic 0:02dd72d1d465 35 LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29);
borlanic 0:02dd72d1d465 36 LPC_SWM->PINENABLE0 |= (1 << 24);
borlanic 0:02dd72d1d465 37 }
borlanic 0:02dd72d1d465 38
borlanic 0:02dd72d1d465 39 static inline void dac_write(int value) {
borlanic 0:02dd72d1d465 40 value &= 0xFFF; // 12-bit
borlanic 0:02dd72d1d465 41
borlanic 0:02dd72d1d465 42 // Set the DAC output
borlanic 0:02dd72d1d465 43 LPC_DAC->VAL = (value << 4);
borlanic 0:02dd72d1d465 44 }
borlanic 0:02dd72d1d465 45
borlanic 0:02dd72d1d465 46 static inline int dac_read() {
borlanic 0:02dd72d1d465 47 return ((LPC_DAC->VAL >> 4) & 0xFFF);
borlanic 0:02dd72d1d465 48 }
borlanic 0:02dd72d1d465 49
borlanic 0:02dd72d1d465 50 void analogout_write(dac_t *obj, float value) {
borlanic 0:02dd72d1d465 51 if (value < 0.0f) {
borlanic 0:02dd72d1d465 52 dac_write(0);
borlanic 0:02dd72d1d465 53 } else if (value > 1.0f) {
borlanic 0:02dd72d1d465 54 dac_write(0xFFF);
borlanic 0:02dd72d1d465 55 } else {
borlanic 0:02dd72d1d465 56 dac_write((uint32_t)(value * (float)0xFFF));
borlanic 0:02dd72d1d465 57 }
borlanic 0:02dd72d1d465 58 }
borlanic 0:02dd72d1d465 59
borlanic 0:02dd72d1d465 60 void analogout_write_u16(dac_t *obj, uint16_t value) {
borlanic 0:02dd72d1d465 61 dac_write(value);
borlanic 0:02dd72d1d465 62 }
borlanic 0:02dd72d1d465 63
borlanic 0:02dd72d1d465 64 float analogout_read(dac_t *obj) {
borlanic 0:02dd72d1d465 65 uint32_t value = dac_read();
borlanic 0:02dd72d1d465 66 return (float)value * (1.0f / (float)0xFFF);
borlanic 0:02dd72d1d465 67 }
borlanic 0:02dd72d1d465 68
borlanic 0:02dd72d1d465 69 uint16_t analogout_read_u16(dac_t *obj) {
borlanic 0:02dd72d1d465 70 return (uint16_t)dac_read();
borlanic 0:02dd72d1d465 71 }