mirror of https://github.com/ARMmbed/mbed-os.git
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbed_assert.h"
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#include "analogout_api.h"
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#include "cmsis.h"
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#include "pinmap.h"
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void analogout_init(dac_t *obj, PinName pin) {
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MBED_ASSERT(pin == P0_12);
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LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29);
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LPC_SYSCON->PDRUNCFG &= ~(1 << 12);
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LPC_IOCON->PIO0_12 = 0;
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LPC_SWM->PINENABLE0 &= ~(1 << 24);
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LPC_DAC->CTRL = 0;
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analogout_write_u16(obj, 0);
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}
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void analogout_free(dac_t *obj)
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{
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LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29);
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LPC_SWM->PINENABLE0 |= (1 << 24);
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}
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static inline void dac_write(int value) {
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value &= 0xFFF; // 12-bit
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// Set the DAC output
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LPC_DAC->VAL = (value << 4);
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}
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static inline int dac_read() {
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return ((LPC_DAC->VAL >> 4) & 0xFFF);
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}
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void analogout_write(dac_t *obj, float value) {
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if (value < 0.0f) {
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dac_write(0);
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} else if (value > 1.0f) {
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dac_write(0xFFF);
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} else {
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dac_write((uint32_t)(value * (float)0xFFF));
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}
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}
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void analogout_write_u16(dac_t *obj, uint16_t value) {
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dac_write(value);
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}
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float analogout_read(dac_t *obj) {
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uint32_t value = dac_read();
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return (float)value * (1.0f / (float)0xFFF);
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}
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uint16_t analogout_read_u16(dac_t *obj) {
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return (uint16_t)dac_read();
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}
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