Jonathan Piat / mbed-src

mbed library sources

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targets/hal/TARGET_NXP/TARGET_LPC2460/analogout_api.c@554:edd95c0879f8, 2015-06-01 (annotated)

Committer:
mbed_official
Date:
Mon Jun 01 11:00:11 2015 +0100
Revision:
554:edd95c0879f8
Synchronized with git revision 7a1d25e3dfbe5bc1457774d4af3c73383a0ff81d



Full URL: https://github.com/mbedmicro/mbed/commit/7a1d25e3dfbe5bc1457774d4af3c73383a0ff81d/



Silicon Labs - Initial test framework pin definitions for EFM32 platforms

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 }