mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC43XX/analogout_api.c
- Committer:
- mbed_official
- Date:
- 2014-06-11
- Revision:
- 227:7bd0639b8911
- Parent:
- 20:4263a77256ae
- Child:
- 256:76fd9a263045
File content as of revision 227:7bd0639b8911:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Ported to NXP LPC43XX by Micromint USA <support@micromint.com> */ #include "mbed_assert.h" #include "analogout_api.h" #include "cmsis.h" #include "pinmap.h" static const PinMap PinMap_DAC[] = { {P_DAC0 , DAC_0, 0x0}, {NC , NC , 0} }; void analogout_init(dac_t *obj, PinName pin) { obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); MBED_ASSERT(obj->dac != (DACName)NC); // Configure the pin as GPIO input pin_function(pin, (SCU_PINIO_PULLNONE | 0x0)); pin_mode(pin, PullNone); // Select DAC on analog function select register in SCU LPC_SCU->ENAIO[2] |= 1; // Sets pin P4_4 as DAC // Set Maximum update rate for DAC */ LPC_DAC->CR &= ~DAC_BIAS_EN; analogout_write_u16(obj, 0); } void analogout_free(dac_t *obj) {} static inline void dac_write(int value) { uint32_t tmp; // Set the DAC output tmp = LPC_DAC->CR & DAC_BIAS_EN; tmp |= DAC_VALUE(value); LPC_DAC->CR = tmp; } static inline int dac_read() { return (DAC_VALUE(LPC_DAC->CR)); } void analogout_write(dac_t *obj, float value) { if (value < 0.0f) { dac_write(0); } else if (value > 1.0f) { dac_write(DAC_RANGE); } else { dac_write(value * (float)DAC_RANGE); } } void analogout_write_u16(dac_t *obj, uint16_t value) { dac_write(value >> 6); // 10-bit } float analogout_read(dac_t *obj) { uint32_t value = dac_read(); return (float)value * (1.0f / (float)DAC_RANGE); } uint16_t analogout_read_u16(dac_t *obj) { uint32_t value = dac_read(); // 10-bit return (value << 6) | ((value >> 4) & 0x003F); }