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Diff: targets/TARGET_NXP/TARGET_LPC15XX/analogout_api.c
- Revision:
- 149:156823d33999
- Parent:
- 144:ef7eb2e8f9f7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_NXP/TARGET_LPC15XX/analogout_api.c Fri Oct 28 11:17:30 2016 +0100 @@ -0,0 +1,71 @@ +/* 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 "mbed_assert.h" +#include "analogout_api.h" +#include "cmsis.h" +#include "pinmap.h" + +void analogout_init(dac_t *obj, PinName pin) { + MBED_ASSERT(pin == P0_12); + + LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 29); + LPC_SYSCON->PDRUNCFG &= ~(1 << 12); + LPC_IOCON->PIO0_12 = 0; + LPC_SWM->PINENABLE0 &= ~(1 << 24); + LPC_DAC->CTRL = 0; + + analogout_write_u16(obj, 0); +} + +void analogout_free(dac_t *obj) +{ + LPC_SYSCON->SYSAHBCLKCTRL0 &= ~(1 << 29); + LPC_SWM->PINENABLE0 |= (1 << 24); +} + +static inline void dac_write(int value) { + value &= 0xFFF; // 12-bit + + // Set the DAC output + LPC_DAC->VAL = (value << 4); +} + +static inline int dac_read() { + return ((LPC_DAC->VAL >> 4) & 0xFFF); +} + +void analogout_write(dac_t *obj, float value) { + if (value < 0.0f) { + dac_write(0); + } else if (value > 1.0f) { + dac_write(0xFFF); + } else { + dac_write((uint32_t)(value * (float)0xFFF)); + } +} + +void analogout_write_u16(dac_t *obj, uint16_t value) { + dac_write(value); +} + +float analogout_read(dac_t *obj) { + uint32_t value = dac_read(); + return (float)value * (1.0f / (float)0xFFF); +} + +uint16_t analogout_read_u16(dac_t *obj) { + return (uint16_t)dac_read(); +}