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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

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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_LPC176X/analogout_api.c@440:8a0b45cd594f, 2014-12-16 (annotated)

Committer:
mbed_official
Date:
Tue Dec 16 08:15:08 2014 +0000
Revision:
440:8a0b45cd594f
Parent:
227:7bd0639b8911 
Synchronized with git revision 67fbbf0b635d0c0d93fbe433306c537c2ad206aa



Full URL: https://github.com/mbedmicro/mbed/commit/67fbbf0b635d0c0d93fbe433306c537c2ad206aa/



Targets: nrf51 - updating app_timer.c from Norid'c SDKv7.1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 10:3bc89ef62ce7 1 /* mbed Microcontroller Library
emilmont 10:3bc89ef62ce7 2 * Copyright (c) 2006-2013 ARM Limited
emilmont 10:3bc89ef62ce7 3 *
emilmont 10:3bc89ef62ce7 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 10:3bc89ef62ce7 5 * you may not use this file except in compliance with the License.
emilmont 10:3bc89ef62ce7 6 * You may obtain a copy of the License at
emilmont 10:3bc89ef62ce7 7 *
emilmont 10:3bc89ef62ce7 8 * http://www.apache.org/licenses/LICENSE-2.0
emilmont 10:3bc89ef62ce7 9 *
emilmont 10:3bc89ef62ce7 10 * Unless required by applicable law or agreed to in writing, software
emilmont 10:3bc89ef62ce7 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 10:3bc89ef62ce7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 10:3bc89ef62ce7 13 * See the License for the specific language governing permissions and
emilmont 10:3bc89ef62ce7 14 * limitations under the License.
emilmont 10:3bc89ef62ce7 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
emilmont 10:3bc89ef62ce7 17 #include "analogout_api.h"
emilmont 10:3bc89ef62ce7 18
emilmont 10:3bc89ef62ce7 19 #include "cmsis.h"
emilmont 10:3bc89ef62ce7 20 #include "pinmap.h"
emilmont 10:3bc89ef62ce7 21
emilmont 10:3bc89ef62ce7 22 static const PinMap PinMap_DAC[] = {
emilmont 10:3bc89ef62ce7 23 {P0_26, DAC_0, 2},
emilmont 10:3bc89ef62ce7 24 {NC , NC , 0}
emilmont 10:3bc89ef62ce7 25 };
emilmont 10:3bc89ef62ce7 26
emilmont 10:3bc89ef62ce7 27 void analogout_init(dac_t *obj, PinName pin) {
emilmont 10:3bc89ef62ce7 28 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official 227:7bd0639b8911 29 MBED_ASSERT(obj->dac != (DACName)NC);
emilmont 10:3bc89ef62ce7 30
emilmont 10:3bc89ef62ce7 31 // power is on by default, set DAC clk divider is /4
emilmont 10:3bc89ef62ce7 32 LPC_SC->PCLKSEL0 &= ~(0x3 << 22);
emilmont 10:3bc89ef62ce7 33
emilmont 10:3bc89ef62ce7 34 // map out (must be done before accessing registers)
emilmont 10:3bc89ef62ce7 35 pinmap_pinout(pin, PinMap_DAC);
emilmont 10:3bc89ef62ce7 36
emilmont 10:3bc89ef62ce7 37 analogout_write_u16(obj, 0);
emilmont 10:3bc89ef62ce7 38 }
emilmont 10:3bc89ef62ce7 39
emilmont 10:3bc89ef62ce7 40 void analogout_free(dac_t *obj) {}
emilmont 10:3bc89ef62ce7 41
emilmont 10:3bc89ef62ce7 42 static inline void dac_write(int value) {
emilmont 10:3bc89ef62ce7 43 value &= 0x3FF; // 10-bit
emilmont 10:3bc89ef62ce7 44
emilmont 10:3bc89ef62ce7 45 // Set the DAC output
emilmont 10:3bc89ef62ce7 46 LPC_DAC->DACR = (0 << 16) // bias = 0
emilmont 10:3bc89ef62ce7 47 | (value << 6);
emilmont 10:3bc89ef62ce7 48 }
emilmont 10:3bc89ef62ce7 49
emilmont 10:3bc89ef62ce7 50 static inline int dac_read() {
emilmont 10:3bc89ef62ce7 51 return (LPC_DAC->DACR >> 6) & 0x3FF;
emilmont 10:3bc89ef62ce7 52 }
emilmont 10:3bc89ef62ce7 53
emilmont 10:3bc89ef62ce7 54 void analogout_write(dac_t *obj, float value) {
emilmont 10:3bc89ef62ce7 55 if (value < 0.0f) {
emilmont 10:3bc89ef62ce7 56 dac_write(0);
emilmont 10:3bc89ef62ce7 57 } else if (value > 1.0f) {
emilmont 10:3bc89ef62ce7 58 dac_write(0x3FF);
emilmont 10:3bc89ef62ce7 59 } else {
emilmont 10:3bc89ef62ce7 60 dac_write(value * (float)0x3FF);
emilmont 10:3bc89ef62ce7 61 }
emilmont 10:3bc89ef62ce7 62 }
emilmont 10:3bc89ef62ce7 63
emilmont 10:3bc89ef62ce7 64 void analogout_write_u16(dac_t *obj, uint16_t value) {
emilmont 10:3bc89ef62ce7 65 dac_write(value >> 6); // 10-bit
emilmont 10:3bc89ef62ce7 66 }
emilmont 10:3bc89ef62ce7 67
emilmont 10:3bc89ef62ce7 68 float analogout_read(dac_t *obj) {
emilmont 10:3bc89ef62ce7 69 uint32_t value = dac_read();
emilmont 10:3bc89ef62ce7 70 return (float)value * (1.0f / (float)0x3FF);
emilmont 10:3bc89ef62ce7 71 }
emilmont 10:3bc89ef62ce7 72
emilmont 10:3bc89ef62ce7 73 uint16_t analogout_read_u16(dac_t *obj) {
emilmont 10:3bc89ef62ce7 74 uint32_t value = dac_read(); // 10-bit
emilmont 10:3bc89ef62ce7 75 return (value << 6) | ((value >> 4) & 0x003F);
emilmont 10:3bc89ef62ce7 76 }