TEAMUSB / mbed-src

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Dependents:   SPI_slave_frdm

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC43XX/analogout_api.c@285:31249416b6f9, 2014-08-15 (annotated)

Committer:
mbed_official
Date:
Fri Aug 15 16:30:08 2014 +0100
Revision:
285:31249416b6f9
Parent:
256:76fd9a263045
Child:
315:1d806f4588f1
Synchronized with git revision 601712595f49bbd2a2771c52cf3e84c9c7a591af



Full URL: https://github.com/mbedmicro/mbed/commit/601712595f49bbd2a2771c52cf3e84c9c7a591af/

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 256:76fd9a263045 27 {P4_4, DAC_0, 0},
mbed_official 256:76fd9a263045 28 {NC, NC, 0}
bogdanm 20:4263a77256ae 29 };
bogdanm 20:4263a77256ae 30
bogdanm 20:4263a77256ae 31 void analogout_init(dac_t *obj, PinName pin) {
bogdanm 20:4263a77256ae 32 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official 227:7bd0639b8911 33 MBED_ASSERT(obj->dac != (DACName)NC);
bogdanm 20:4263a77256ae 34
mbed_official 256:76fd9a263045 35 // Reset pin function to GPIO
mbed_official 256:76fd9a263045 36 gpio_set(pin);
bogdanm 20:4263a77256ae 37 // Select DAC on analog function select register in SCU
mbed_official 256:76fd9a263045 38 LPC_SCU->ENAIO[2] |= 1; // Sets pin as DAC
bogdanm 20:4263a77256ae 39
mbed_official 256:76fd9a263045 40 // Set bias=0 for maximum DAC update rate (1 MHz)
bogdanm 20:4263a77256ae 41 LPC_DAC->CR &= ~DAC_BIAS_EN;
mbed_official 256:76fd9a263045 42 // Enable DAC and DMA
mbed_official 256:76fd9a263045 43 LPC_DAC->CTRL |= DAC_DMA_ENA;
bogdanm 20:4263a77256ae 44
bogdanm 20:4263a77256ae 45 analogout_write_u16(obj, 0);
bogdanm 20:4263a77256ae 46 }
bogdanm 20:4263a77256ae 47
bogdanm 20:4263a77256ae 48 void analogout_free(dac_t *obj) {}
bogdanm 20:4263a77256ae 49
bogdanm 20:4263a77256ae 50 static inline void dac_write(int value) {
bogdanm 20:4263a77256ae 51
bogdanm 20:4263a77256ae 52 // Set the DAC output
mbed_official 256:76fd9a263045 53 LPC_DAC->CR = DAC_SET(value);
bogdanm 20:4263a77256ae 54 }
bogdanm 20:4263a77256ae 55
bogdanm 20:4263a77256ae 56 static inline int dac_read() {
mbed_official 256:76fd9a263045 57 return (DAC_GET(LPC_DAC->CR));
bogdanm 20:4263a77256ae 58 }
bogdanm 20:4263a77256ae 59
bogdanm 20:4263a77256ae 60 void analogout_write(dac_t *obj, float value) {
bogdanm 20:4263a77256ae 61 if (value < 0.0f) {
bogdanm 20:4263a77256ae 62 dac_write(0);
bogdanm 20:4263a77256ae 63 } else if (value > 1.0f) {
bogdanm 20:4263a77256ae 64 dac_write(DAC_RANGE);
bogdanm 20:4263a77256ae 65 } else {
bogdanm 20:4263a77256ae 66 dac_write(value * (float)DAC_RANGE);
bogdanm 20:4263a77256ae 67 }
bogdanm 20:4263a77256ae 68 }
bogdanm 20:4263a77256ae 69
bogdanm 20:4263a77256ae 70 void analogout_write_u16(dac_t *obj, uint16_t value) {
bogdanm 20:4263a77256ae 71 dac_write(value >> 6); // 10-bit
bogdanm 20:4263a77256ae 72 }
bogdanm 20:4263a77256ae 73
bogdanm 20:4263a77256ae 74 float analogout_read(dac_t *obj) {
bogdanm 20:4263a77256ae 75 uint32_t value = dac_read();
bogdanm 20:4263a77256ae 76 return (float)value * (1.0f / (float)DAC_RANGE);
bogdanm 20:4263a77256ae 77 }
bogdanm 20:4263a77256ae 78
bogdanm 20:4263a77256ae 79 uint16_t analogout_read_u16(dac_t *obj) {
bogdanm 20:4263a77256ae 80 uint32_t value = dac_read(); // 10-bit
bogdanm 20:4263a77256ae 81 return (value << 6) | ((value >> 4) & 0x003F);
bogdanm 20:4263a77256ae 82 }