mirror of https://github.com/ARMmbed/mbed-os.git
90 lines
2.2 KiB
C
90 lines
2.2 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 "analogout_api.h"
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#if DEVICE_ANALOGOUT
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#include "cmsis.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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#include "fsl_dac.h"
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#include "PeripheralPins.h"
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/* Array of DAC peripheral base address. */
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static DAC_Type *const dac_bases[] = DAC_BASE_PTRS;
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#define RANGE_12BIT 0xFFF
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void analogout_init(dac_t *obj, PinName pin)
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{
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dac_config_t dac_config;
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obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
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if (obj->dac == (DACName)NC) {
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error("DAC pin mapping failed");
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}
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DAC_GetDefaultConfig(&dac_config);
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DAC_Init(dac_bases[obj->dac], &dac_config);
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DAC_SetBufferValue(dac_bases[obj->dac], 0, 0);
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DAC_Enable(dac_bases[obj->dac], true);
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}
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void analogout_free(dac_t *obj)
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{
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}
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static inline void dac_write(dac_t *obj, int value)
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{
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DAC_SetBufferValue(dac_bases[obj->dac], 0, (uint16_t)value);
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}
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static inline int dac_read(dac_t *obj)
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{
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return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
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}
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void analogout_write(dac_t *obj, float value)
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{
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if (value < 0.0f) {
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dac_write(obj, 0);
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} else if (value > 1.0f) {
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dac_write(obj, RANGE_12BIT);
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} else {
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dac_write(obj, value * (float)RANGE_12BIT);
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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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{
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dac_write(obj, value >> 4); // 12-bit
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}
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float analogout_read(dac_t *obj)
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{
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uint32_t value = dac_read(obj);
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return (float)value * (1.0f / (float)RANGE_12BIT);
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}
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uint16_t analogout_read_u16(dac_t *obj)
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{
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uint32_t value = dac_read(obj); // 12-bit
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return (value << 4) | ((value >> 8) & 0x003F);
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}
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#endif
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