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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC2460/analogout_api.c@621:9c82b0f79f3d, 2015-09-11 (annotated)

Committer:
mbed_official
Date:
Fri Sep 11 09:30:09 2015 +0100
Revision:
621:9c82b0f79f3d
Parent:
554:edd95c0879f8 
Synchronized with git revision 6c1d63e069ab9bd86de92e8296ca783681257538



Full URL: https://github.com/mbedmicro/mbed/commit/6c1d63e069ab9bd86de92e8296ca783681257538/



ignore target files not supported by the yotta module

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 554:edd95c0879f8 1 /* mbed Microcontroller Library
mbed_official 554:edd95c0879f8 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 554:edd95c0879f8 3 *
mbed_official 554:edd95c0879f8 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 554:edd95c0879f8 5 * you may not use this file except in compliance with the License.
mbed_official 554:edd95c0879f8 6 * You may obtain a copy of the License at
mbed_official 554:edd95c0879f8 7 *
mbed_official 554:edd95c0879f8 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 554:edd95c0879f8 9 *
mbed_official 554:edd95c0879f8 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 554:edd95c0879f8 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 554:edd95c0879f8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 554:edd95c0879f8 13 * See the License for the specific language governing permissions and
mbed_official 554:edd95c0879f8 14 * limitations under the License.
mbed_official 554:edd95c0879f8 15 */
mbed_official 554:edd95c0879f8 16 #include "mbed_assert.h"
mbed_official 554:edd95c0879f8 17 #include "analogout_api.h"
mbed_official 554:edd95c0879f8 18 #include "cmsis.h"
mbed_official 554:edd95c0879f8 19 #include "pinmap.h"
mbed_official 554:edd95c0879f8 20
mbed_official 554:edd95c0879f8 21 static const PinMap PinMap_DAC[] = {
mbed_official 554:edd95c0879f8 22 {P0_26, DAC_0, 2},
mbed_official 554:edd95c0879f8 23 {NC , NC , 0}
mbed_official 554:edd95c0879f8 24 };
mbed_official 554:edd95c0879f8 25
mbed_official 554:edd95c0879f8 26 void analogout_init(dac_t *obj, PinName pin) {
mbed_official 554:edd95c0879f8 27 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official 554:edd95c0879f8 28 MBED_ASSERT(obj->dac != (DACName)NC);
mbed_official 554:edd95c0879f8 29
mbed_official 554:edd95c0879f8 30 // power is on by default, set DAC clk divider is /4
mbed_official 554:edd95c0879f8 31 LPC_SC->PCLKSEL0 &= ~(0x3 << 22);
mbed_official 554:edd95c0879f8 32
mbed_official 554:edd95c0879f8 33 // map out (must be done before accessing registers)
mbed_official 554:edd95c0879f8 34 pinmap_pinout(pin, PinMap_DAC);
mbed_official 554:edd95c0879f8 35
mbed_official 554:edd95c0879f8 36 analogout_write_u16(obj, 0);
mbed_official 554:edd95c0879f8 37 }
mbed_official 554:edd95c0879f8 38
mbed_official 554:edd95c0879f8 39 void analogout_free(dac_t *obj) {}
mbed_official 554:edd95c0879f8 40
mbed_official 554:edd95c0879f8 41 static inline void dac_write(int value) {
mbed_official 554:edd95c0879f8 42 value &= 0x3FF; // 10-bit
mbed_official 554:edd95c0879f8 43
mbed_official 554:edd95c0879f8 44 // Set the DAC output
mbed_official 554:edd95c0879f8 45 LPC_DAC->DACR = (0 << 16) // bias = 0
mbed_official 554:edd95c0879f8 46 | (value << 6);
mbed_official 554:edd95c0879f8 47 }
mbed_official 554:edd95c0879f8 48
mbed_official 554:edd95c0879f8 49 static inline int dac_read() {
mbed_official 554:edd95c0879f8 50 return (LPC_DAC->DACR >> 6) & 0x3FF;
mbed_official 554:edd95c0879f8 51 }
mbed_official 554:edd95c0879f8 52
mbed_official 554:edd95c0879f8 53 void analogout_write(dac_t *obj, float value) {
mbed_official 554:edd95c0879f8 54 if (value < 0.0f) {
mbed_official 554:edd95c0879f8 55 dac_write(0);
mbed_official 554:edd95c0879f8 56 } else if (value > 1.0f) {
mbed_official 554:edd95c0879f8 57 dac_write(0x3FF);
mbed_official 554:edd95c0879f8 58 } else {
mbed_official 554:edd95c0879f8 59 dac_write(value * (float)0x3FF);
mbed_official 554:edd95c0879f8 60 }
mbed_official 554:edd95c0879f8 61 }
mbed_official 554:edd95c0879f8 62
mbed_official 554:edd95c0879f8 63 void analogout_write_u16(dac_t *obj, uint16_t value) {
mbed_official 554:edd95c0879f8 64 dac_write(value >> 6); // 10-bit
mbed_official 554:edd95c0879f8 65 }
mbed_official 554:edd95c0879f8 66
mbed_official 554:edd95c0879f8 67 float analogout_read(dac_t *obj) {
mbed_official 554:edd95c0879f8 68 uint32_t value = dac_read();
mbed_official 554:edd95c0879f8 69 return (float)value * (1.0f / (float)0x3FF);
mbed_official 554:edd95c0879f8 70 }
mbed_official 554:edd95c0879f8 71
mbed_official 554:edd95c0879f8 72 uint16_t analogout_read_u16(dac_t *obj) {
mbed_official 554:edd95c0879f8 73 uint32_t value = dac_read(); // 10-bit
mbed_official 554:edd95c0879f8 74 return (value << 6) | ((value >> 4) & 0x003F);
mbed_official 554:edd95c0879f8 75 }