EL4121 Embedded System / mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

targets/TARGET_NXP/TARGET_LPC15XX/analogout_api.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /* mbed Microcontroller Library
be_bryan 0:b74591d5ab33 2 * Copyright (c) 2006-2013 ARM Limited
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Licensed under the Apache License, Version 2.0 (the "License");
be_bryan 0:b74591d5ab33 5 * you may not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 6 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 7 *
be_bryan 0:b74591d5ab33 8 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 9 *
be_bryan 0:b74591d5ab33 10 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 11 * distributed under the License is distributed on an "AS IS" BASIS,
be_bryan 0:b74591d5ab33 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 13 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 14 * limitations under the License.
be_bryan 0:b74591d5ab33 15 */
be_bryan 0:b74591d5ab33 16 #include "mbed_assert.h"
be_bryan 0:b74591d5ab33 17 #include "analogout_api.h"
be_bryan 0:b74591d5ab33 18 #include "cmsis.h"
be_bryan 0:b74591d5ab33 19 #include "pinmap.h"
be_bryan 0:b74591d5ab33 20
be_bryan 0:b74591d5ab33 21 void analogout_init(dac_t *obj, PinName pin) {
be_bryan 0:b74591d5ab33 22 MBED_ASSERT(pin == P0_12);
be_bryan 0:b74591d5ab33 23
be_bryan 0:b74591d5ab33 24 LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29);
be_bryan 0:b74591d5ab33 25 LPC_SYSCON->PDRUNCFG &= ~(1 << 12);
be_bryan 0:b74591d5ab33 26 LPC_IOCON->PIO0_12 = 0;
be_bryan 0:b74591d5ab33 27 LPC_SWM->PINENABLE0 &= ~(1 << 24);
be_bryan 0:b74591d5ab33 28 LPC_DAC->CTRL = 0;
be_bryan 0:b74591d5ab33 29
be_bryan 0:b74591d5ab33 30 analogout_write_u16(obj, 0);
be_bryan 0:b74591d5ab33 31 }
be_bryan 0:b74591d5ab33 32
be_bryan 0:b74591d5ab33 33 void analogout_free(dac_t *obj)
be_bryan 0:b74591d5ab33 34 {
be_bryan 0:b74591d5ab33 35 LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29);
be_bryan 0:b74591d5ab33 36 LPC_SWM->PINENABLE0 |= (1 << 24);
be_bryan 0:b74591d5ab33 37 }
be_bryan 0:b74591d5ab33 38
be_bryan 0:b74591d5ab33 39 static inline void dac_write(int value) {
be_bryan 0:b74591d5ab33 40 value &= 0xFFF; // 12-bit
be_bryan 0:b74591d5ab33 41
be_bryan 0:b74591d5ab33 42 // Set the DAC output
be_bryan 0:b74591d5ab33 43 LPC_DAC->VAL = (value << 4);
be_bryan 0:b74591d5ab33 44 }
be_bryan 0:b74591d5ab33 45
be_bryan 0:b74591d5ab33 46 static inline int dac_read() {
be_bryan 0:b74591d5ab33 47 return ((LPC_DAC->VAL >> 4) & 0xFFF);
be_bryan 0:b74591d5ab33 48 }
be_bryan 0:b74591d5ab33 49
be_bryan 0:b74591d5ab33 50 void analogout_write(dac_t *obj, float value) {
be_bryan 0:b74591d5ab33 51 if (value < 0.0f) {
be_bryan 0:b74591d5ab33 52 dac_write(0);
be_bryan 0:b74591d5ab33 53 } else if (value > 1.0f) {
be_bryan 0:b74591d5ab33 54 dac_write(0xFFF);
be_bryan 0:b74591d5ab33 55 } else {
be_bryan 0:b74591d5ab33 56 dac_write((uint32_t)(value * (float)0xFFF));
be_bryan 0:b74591d5ab33 57 }
be_bryan 0:b74591d5ab33 58 }
be_bryan 0:b74591d5ab33 59
be_bryan 0:b74591d5ab33 60 void analogout_write_u16(dac_t *obj, uint16_t value) {
be_bryan 0:b74591d5ab33 61 dac_write(value);
be_bryan 0:b74591d5ab33 62 }
be_bryan 0:b74591d5ab33 63
be_bryan 0:b74591d5ab33 64 float analogout_read(dac_t *obj) {
be_bryan 0:b74591d5ab33 65 uint32_t value = dac_read();
be_bryan 0:b74591d5ab33 66 return (float)value * (1.0f / (float)0xFFF);
be_bryan 0:b74591d5ab33 67 }
be_bryan 0:b74591d5ab33 68
be_bryan 0:b74591d5ab33 69 uint16_t analogout_read_u16(dac_t *obj) {
be_bryan 0:b74591d5ab33 70 return (uint16_t)dac_read();
be_bryan 0:b74591d5ab33 71 }