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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_LPC408X/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
bogdanm 15:4892fe388435 1 /* mbed Microcontroller Library
bogdanm 15:4892fe388435 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 15:4892fe388435 3 *
bogdanm 15:4892fe388435 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 15:4892fe388435 5 * you may not use this file except in compliance with the License.
bogdanm 15:4892fe388435 6 * You may obtain a copy of the License at
bogdanm 15:4892fe388435 7 *
bogdanm 15:4892fe388435 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 15:4892fe388435 9 *
bogdanm 15:4892fe388435 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 15:4892fe388435 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 15:4892fe388435 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 15:4892fe388435 13 * See the License for the specific language governing permissions and
bogdanm 15:4892fe388435 14 * limitations under the License.
bogdanm 15:4892fe388435 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
bogdanm 15:4892fe388435 17 #include "analogout_api.h"
bogdanm 15:4892fe388435 18 #include "cmsis.h"
bogdanm 15:4892fe388435 19 #include "pinmap.h"
bogdanm 15:4892fe388435 20
bogdanm 15:4892fe388435 21 static const PinMap PinMap_DAC[] = {
bogdanm 15:4892fe388435 22 {P0_26, DAC_0, 2},
bogdanm 15:4892fe388435 23 {NC , NC , 0}
bogdanm 15:4892fe388435 24 };
bogdanm 15:4892fe388435 25
bogdanm 15:4892fe388435 26 void analogout_init(dac_t *obj, PinName pin) {
bogdanm 15:4892fe388435 27 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official 227:7bd0639b8911 28 MBED_ASSERT(obj->dac != (DACName)NC);
bogdanm 15:4892fe388435 29
bogdanm 15:4892fe388435 30 // DAC enable bit must be set
bogdanm 15:4892fe388435 31 LPC_IOCON->P0_26 |= (1 << 16); // DACEN
bogdanm 15:4892fe388435 32
bogdanm 15:4892fe388435 33 // map out (must be done before accessing registers)
bogdanm 15:4892fe388435 34 pinmap_pinout(pin, PinMap_DAC);
bogdanm 15:4892fe388435 35
bogdanm 15:4892fe388435 36 analogout_write_u16(obj, 0);
bogdanm 15:4892fe388435 37 }
bogdanm 15:4892fe388435 38
bogdanm 15:4892fe388435 39 void analogout_free(dac_t *obj) {}
bogdanm 15:4892fe388435 40
bogdanm 15:4892fe388435 41 static inline void dac_write(int value) {
bogdanm 15:4892fe388435 42 value &= 0x3FF; // 10-bit
bogdanm 15:4892fe388435 43
bogdanm 15:4892fe388435 44 // Set the DAC output
bogdanm 15:4892fe388435 45 LPC_DAC->CR = (0 << 16) // bias = 0
bogdanm 15:4892fe388435 46 | (value << 6);
bogdanm 15:4892fe388435 47 }
bogdanm 15:4892fe388435 48
bogdanm 15:4892fe388435 49 static inline int dac_read() {
bogdanm 15:4892fe388435 50 return (LPC_DAC->CR >> 6) & 0x3FF;
bogdanm 15:4892fe388435 51 }
bogdanm 15:4892fe388435 52
bogdanm 15:4892fe388435 53 void analogout_write(dac_t *obj, float value) {
bogdanm 15:4892fe388435 54 if (value < 0.0f) {
bogdanm 15:4892fe388435 55 dac_write(0);
bogdanm 15:4892fe388435 56 } else if (value > 1.0f) {
bogdanm 15:4892fe388435 57 dac_write(0x3FF);
bogdanm 15:4892fe388435 58 } else {
bogdanm 15:4892fe388435 59 dac_write(value * (float)0x3FF);
bogdanm 15:4892fe388435 60 }
bogdanm 15:4892fe388435 61 }
bogdanm 15:4892fe388435 62
bogdanm 15:4892fe388435 63 void analogout_write_u16(dac_t *obj, uint16_t value) {
bogdanm 15:4892fe388435 64 dac_write(value >> 6); // 10-bit
bogdanm 15:4892fe388435 65 }
bogdanm 15:4892fe388435 66
bogdanm 15:4892fe388435 67 float analogout_read(dac_t *obj) {
bogdanm 15:4892fe388435 68 uint32_t value = dac_read();
bogdanm 15:4892fe388435 69 return (float)value * (1.0f / (float)0x3FF);
bogdanm 15:4892fe388435 70 }
bogdanm 15:4892fe388435 71
bogdanm 15:4892fe388435 72 uint16_t analogout_read_u16(dac_t *obj) {
bogdanm 15:4892fe388435 73 uint32_t value = dac_read(); // 10-bit
bogdanm 15:4892fe388435 74 return (value << 6) | ((value >> 4) & 0x003F);
bogdanm 15:4892fe388435 75 }