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targets/hal/TARGET_NXP/TARGET_LPC43XX/analogout_api.c@20:4263a77256ae, 2013-09-10 (annotated)

Committer:
bogdanm
Date:
Tue Sep 10 15:14:19 2013 +0300
Revision:
20:4263a77256ae
Child:
227:7bd0639b8911
Sync with git revision 171dda705c947bf910926a0b73d6a4797802554d

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 */
bogdanm 20:4263a77256ae 18 #include "analogout_api.h"
bogdanm 20:4263a77256ae 19 #include "cmsis.h"
bogdanm 20:4263a77256ae 20 #include "pinmap.h"
bogdanm 20:4263a77256ae 21 #include "error.h"
bogdanm 20:4263a77256ae 22
bogdanm 20:4263a77256ae 23 static const PinMap PinMap_DAC[] = {
bogdanm 20:4263a77256ae 24 {P_DAC0 , DAC_0, 0x0},
bogdanm 20:4263a77256ae 25 {NC , NC , 0}
bogdanm 20:4263a77256ae 26 };
bogdanm 20:4263a77256ae 27
bogdanm 20:4263a77256ae 28 void analogout_init(dac_t *obj, PinName pin) {
bogdanm 20:4263a77256ae 29 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
bogdanm 20:4263a77256ae 30 if (obj->dac == (DACName)NC) {
bogdanm 20:4263a77256ae 31 error("DAC pin mapping failed");
bogdanm 20:4263a77256ae 32 }
bogdanm 20:4263a77256ae 33
bogdanm 20:4263a77256ae 34 // Configure the pin as GPIO input
bogdanm 20:4263a77256ae 35 pin_function(pin, (SCU_PINIO_PULLNONE | 0x0));
bogdanm 20:4263a77256ae 36 pin_mode(pin, PullNone);
bogdanm 20:4263a77256ae 37 // Select DAC on analog function select register in SCU
bogdanm 20:4263a77256ae 38 LPC_SCU->ENAIO[2] |= 1; // Sets pin P4_4 as DAC
bogdanm 20:4263a77256ae 39
bogdanm 20:4263a77256ae 40 // Set Maximum update rate for DAC */
bogdanm 20:4263a77256ae 41 LPC_DAC->CR &= ~DAC_BIAS_EN;
bogdanm 20:4263a77256ae 42
bogdanm 20:4263a77256ae 43 analogout_write_u16(obj, 0);
bogdanm 20:4263a77256ae 44 }
bogdanm 20:4263a77256ae 45
bogdanm 20:4263a77256ae 46 void analogout_free(dac_t *obj) {}
bogdanm 20:4263a77256ae 47
bogdanm 20:4263a77256ae 48 static inline void dac_write(int value) {
bogdanm 20:4263a77256ae 49 uint32_t tmp;
bogdanm 20:4263a77256ae 50
bogdanm 20:4263a77256ae 51 // Set the DAC output
bogdanm 20:4263a77256ae 52 tmp = LPC_DAC->CR & DAC_BIAS_EN;
bogdanm 20:4263a77256ae 53 tmp |= DAC_VALUE(value);
bogdanm 20:4263a77256ae 54 LPC_DAC->CR = tmp;
bogdanm 20:4263a77256ae 55 }
bogdanm 20:4263a77256ae 56
bogdanm 20:4263a77256ae 57 static inline int dac_read() {
bogdanm 20:4263a77256ae 58 return (DAC_VALUE(LPC_DAC->CR));
bogdanm 20:4263a77256ae 59 }
bogdanm 20:4263a77256ae 60
bogdanm 20:4263a77256ae 61 void analogout_write(dac_t *obj, float value) {
bogdanm 20:4263a77256ae 62 if (value < 0.0f) {
bogdanm 20:4263a77256ae 63 dac_write(0);
bogdanm 20:4263a77256ae 64 } else if (value > 1.0f) {
bogdanm 20:4263a77256ae 65 dac_write(DAC_RANGE);
bogdanm 20:4263a77256ae 66 } else {
bogdanm 20:4263a77256ae 67 dac_write(value * (float)DAC_RANGE);
bogdanm 20:4263a77256ae 68 }
bogdanm 20:4263a77256ae 69 }
bogdanm 20:4263a77256ae 70
bogdanm 20:4263a77256ae 71 void analogout_write_u16(dac_t *obj, uint16_t value) {
bogdanm 20:4263a77256ae 72 dac_write(value >> 6); // 10-bit
bogdanm 20:4263a77256ae 73 }
bogdanm 20:4263a77256ae 74
bogdanm 20:4263a77256ae 75 float analogout_read(dac_t *obj) {
bogdanm 20:4263a77256ae 76 uint32_t value = dac_read();
bogdanm 20:4263a77256ae 77 return (float)value * (1.0f / (float)DAC_RANGE);
bogdanm 20:4263a77256ae 78 }
bogdanm 20:4263a77256ae 79
bogdanm 20:4263a77256ae 80 uint16_t analogout_read_u16(dac_t *obj) {
bogdanm 20:4263a77256ae 81 uint32_t value = dac_read(); // 10-bit
bogdanm 20:4263a77256ae 82 return (value << 6) | ((value >> 4) & 0x003F);
bogdanm 20:4263a77256ae 83 }