mbed library sources
Dependents: frdm_kl05z_gpio_test
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Diff: targets/hal/TARGET_NXP/TARGET_LPC43XX/analogout_api.c
- Revision:
- 20:4263a77256ae
- Child:
- 227:7bd0639b8911
diff -r 398f4c622e1b -r 4263a77256ae targets/hal/TARGET_NXP/TARGET_LPC43XX/analogout_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_NXP/TARGET_LPC43XX/analogout_api.c Tue Sep 10 15:14:19 2013 +0300 @@ -0,0 +1,83 @@ +/* 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 "analogout_api.h" +#include "cmsis.h" +#include "pinmap.h" +#include "error.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); + if (obj->dac == (DACName)NC) { + error("DAC pin mapping failed"); + } + + // 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); +}