mbed official / mbed-src

mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_LPC43XX/analogout_api.c@463:5c73c3744533, 2015-02-03 (annotated)

Committer:
mbed_official
Date:
Tue Feb 03 17:00:07 2015 +0000
Revision:
463:5c73c3744533
Parent:
315:1d806f4588f1 
Synchronized with git revision 134a67aab259d410373367cb96b73420b390d385



Full URL: https://github.com/mbedmicro/mbed/commit/134a67aab259d410373367cb96b73420b390d385/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 20:4263a77256ae 1 /* mbed Microcontroller Library
bogdanm 20:4263a77256ae 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 20:4263a77256ae 3 *
bogdanm 20:4263a77256ae 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 20:4263a77256ae 5 * you may not use this file except in compliance with the License.
bogdanm 20:4263a77256ae 6 * You may obtain a copy of the License at
bogdanm 20:4263a77256ae 7 *
bogdanm 20:4263a77256ae 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 20:4263a77256ae 9 *
bogdanm 20:4263a77256ae 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 20:4263a77256ae 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 20:4263a77256ae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 20:4263a77256ae 13 * See the License for the specific language governing permissions and
bogdanm 20:4263a77256ae 14 * limitations under the License.
bogdanm 20:4263a77256ae 15 *
bogdanm 20:4263a77256ae 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
bogdanm 20:4263a77256ae 17 */
mbed_official 227:7bd0639b8911 18 #include "mbed_assert.h"
bogdanm 20:4263a77256ae 19 #include "analogout_api.h"
mbed_official 256:76fd9a263045 20
bogdanm 20:4263a77256ae 21 #include "cmsis.h"
bogdanm 20:4263a77256ae 22 #include "pinmap.h"
mbed_official 285:31249416b6f9 23 #include "mbed_error.h"
mbed_official 256:76fd9a263045 24 #include "gpio_api.h"
bogdanm 20:4263a77256ae 25
bogdanm 20:4263a77256ae 26 static const PinMap PinMap_DAC[] = {
mbed_official 315:1d806f4588f1 27 #ifdef TARGET_LPC4337
mbed_official 315:1d806f4588f1 28 {P4_3, DAC_0, 0},
mbed_official 315:1d806f4588f1 29 #else
mbed_official 256:76fd9a263045 30 {P4_4, DAC_0, 0},
mbed_official 315:1d806f4588f1 31 #endif
mbed_official 256:76fd9a263045 32 {NC, NC, 0}
bogdanm 20:4263a77256ae 33 };
bogdanm 20:4263a77256ae 34
bogdanm 20:4263a77256ae 35 void analogout_init(dac_t *obj, PinName pin) {
bogdanm 20:4263a77256ae 36 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official 227:7bd0639b8911 37 MBED_ASSERT(obj->dac != (DACName)NC);
bogdanm 20:4263a77256ae 38
mbed_official 256:76fd9a263045 39 // Reset pin function to GPIO
mbed_official 256:76fd9a263045 40 gpio_set(pin);
bogdanm 20:4263a77256ae 41 // Select DAC on analog function select register in SCU
mbed_official 256:76fd9a263045 42 LPC_SCU->ENAIO[2] |= 1; // Sets pin as DAC
bogdanm 20:4263a77256ae 43
mbed_official 256:76fd9a263045 44 // Set bias=0 for maximum DAC update rate (1 MHz)
bogdanm 20:4263a77256ae 45 LPC_DAC->CR &= ~DAC_BIAS_EN;
mbed_official 256:76fd9a263045 46 // Enable DAC and DMA
mbed_official 256:76fd9a263045 47 LPC_DAC->CTRL |= DAC_DMA_ENA;
bogdanm 20:4263a77256ae 48
bogdanm 20:4263a77256ae 49 analogout_write_u16(obj, 0);
bogdanm 20:4263a77256ae 50 }
bogdanm 20:4263a77256ae 51
bogdanm 20:4263a77256ae 52 void analogout_free(dac_t *obj) {}
bogdanm 20:4263a77256ae 53
bogdanm 20:4263a77256ae 54 static inline void dac_write(int value) {
bogdanm 20:4263a77256ae 55
bogdanm 20:4263a77256ae 56 // Set the DAC output
mbed_official 256:76fd9a263045 57 LPC_DAC->CR = DAC_SET(value);
bogdanm 20:4263a77256ae 58 }
bogdanm 20:4263a77256ae 59
bogdanm 20:4263a77256ae 60 static inline int dac_read() {
mbed_official 256:76fd9a263045 61 return (DAC_GET(LPC_DAC->CR));
bogdanm 20:4263a77256ae 62 }
bogdanm 20:4263a77256ae 63
bogdanm 20:4263a77256ae 64 void analogout_write(dac_t *obj, float value) {
bogdanm 20:4263a77256ae 65 if (value < 0.0f) {
bogdanm 20:4263a77256ae 66 dac_write(0);
bogdanm 20:4263a77256ae 67 } else if (value > 1.0f) {
bogdanm 20:4263a77256ae 68 dac_write(DAC_RANGE);
bogdanm 20:4263a77256ae 69 } else {
bogdanm 20:4263a77256ae 70 dac_write(value * (float)DAC_RANGE);
bogdanm 20:4263a77256ae 71 }
bogdanm 20:4263a77256ae 72 }
bogdanm 20:4263a77256ae 73
bogdanm 20:4263a77256ae 74 void analogout_write_u16(dac_t *obj, uint16_t value) {
bogdanm 20:4263a77256ae 75 dac_write(value >> 6); // 10-bit
bogdanm 20:4263a77256ae 76 }
bogdanm 20:4263a77256ae 77
bogdanm 20:4263a77256ae 78 float analogout_read(dac_t *obj) {
bogdanm 20:4263a77256ae 79 uint32_t value = dac_read();
bogdanm 20:4263a77256ae 80 return (float)value * (1.0f / (float)DAC_RANGE);
bogdanm 20:4263a77256ae 81 }
bogdanm 20:4263a77256ae 82
bogdanm 20:4263a77256ae 83 uint16_t analogout_read_u16(dac_t *obj) {
bogdanm 20:4263a77256ae 84 uint32_t value = dac_read(); // 10-bit
bogdanm 20:4263a77256ae 85 return (value << 6) | ((value >> 4) & 0x003F);
bogdanm 20:4263a77256ae 86 }