mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC176X/analogout_api.c
- Committer:
- bogdanm
- Date:
- 2013-08-05
- Revision:
- 13:0645d8841f51
- Parent:
- vendor/NXP/LPC1768/hal/analogout_api.c@ 10:3bc89ef62ce7
- Child:
- 19:398f4c622e1b
File content as of revision 13:0645d8841f51:
/* 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. */ #include "analogout_api.h" #include "cmsis.h" #include "pinmap.h" #include "error.h" static const PinMap PinMap_DAC[] = { {P0_26, DAC_0, 2}, {NC , NC , 0} }; void analogout_init(dac_t *obj, PinName pin) { obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); if (obj->dac == (uint32_t)NC) { error("DAC pin mapping failed"); } // power is on by default, set DAC clk divider is /4 LPC_SC->PCLKSEL0 &= ~(0x3 << 22); // map out (must be done before accessing registers) pinmap_pinout(pin, PinMap_DAC); analogout_write_u16(obj, 0); } void analogout_free(dac_t *obj) {} static inline void dac_write(int value) { value &= 0x3FF; // 10-bit // Set the DAC output LPC_DAC->DACR = (0 << 16) // bias = 0 | (value << 6); } static inline int dac_read() { return (LPC_DAC->DACR >> 6) & 0x3FF; } void analogout_write(dac_t *obj, float value) { if (value < 0.0f) { dac_write(0); } else if (value > 1.0f) { dac_write(0x3FF); } else { dac_write(value * (float)0x3FF); } } 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)0x3FF); } uint16_t analogout_read_u16(dac_t *obj) { uint32_t value = dac_read(); // 10-bit return (value << 6) | ((value >> 4) & 0x003F); }