mirror of https://github.com/ARMmbed/mbed-os.git
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2015 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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#if DEVICE_ANALOGOUT
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#include "cmsis.h"
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#include "pinmap.h"
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#include "PeripheralPins.h"
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#define RANGE_12BIT 0xFFF
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void analogout_init(dac_t *obj, PinName pin) {
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obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
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MBED_ASSERT(obj->dac != (DACName)NC);
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SIM->SCGC2 |= SIM_SCGC2_DAC0_MASK;
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uint32_t port = (uint32_t)pin >> PORT_SHIFT;
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SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
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DAC0->DAT[obj->dac].DATH = 0;
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DAC0->DAT[obj->dac].DATL = 0;
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DAC0->C1 = DAC_C1_DACBFMD_MASK; // One-Time Scan Mode
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DAC0->C0 = DAC_C0_DACEN_MASK // Enable
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| DAC_C0_DACSWTRG_MASK // Software Trigger
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| DAC_C0_DACRFS_MASK; // VDDA selected
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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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static inline void dac_write(dac_t *obj, int value) {
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DAC0->DAT[obj->dac].DATL = (uint8_t)( value & 0xFF);
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DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
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}
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static inline int dac_read(dac_t *obj) {
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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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if (value < 0.0) {
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dac_write(obj, 0);
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} else if (value > 1.0) {
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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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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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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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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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