1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2013 ARM Limited
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 #include "mbed_assert.h"
17 #include "analogout_api.h"
21 void analogout_init(dac_t *obj, PinName pin) {
22 MBED_ASSERT(pin == P0_12);
24 LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29);
25 LPC_SYSCON->PDRUNCFG &= ~(1 << 12);
26 LPC_IOCON->PIO0_12 = 0;
27 LPC_SWM->PINENABLE0 &= ~(1 << 24);
30 analogout_write_u16(obj, 0);
33 void analogout_free(dac_t *obj)
35 LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29);
36 LPC_SWM->PINENABLE0 |= (1 << 24);
39 static inline void dac_write(int value) {
40 value &= 0xFFF; // 12-bit
43 LPC_DAC->VAL = (value << 4);
46 static inline int dac_read() {
47 return ((LPC_DAC->VAL >> 4) & 0xFFF);
50 void analogout_write(dac_t *obj, float value) {
53 } else if (value > 1.0f) {
56 dac_write((uint32_t)(value * (float)0xFFF));
60 void analogout_write_u16(dac_t *obj, uint16_t value) {
64 float analogout_read(dac_t *obj) {
65 uint32_t value = dac_read();
66 return (float)value * (1.0f / (float)0xFFF);
69 uint16_t analogout_read_u16(dac_t *obj) {
70 return (uint16_t)dac_read();