mbed-src | Mbed

Users » mbed_official » Code » mbed-src

Dependents: Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

targets/hal/TARGET_NXP/TARGET_LPC176X/analogout_api.c@274:6937b19af361, 2014-08-06 (annotated)

Committer:: mbed_official
Date:: Wed Aug 06 08:15:07 2014 +0100
Revision:: 274:6937b19af361
Parent:: 227:7bd0639b8911

Synchronized with git revision 5b145e4f6c509376173c3ea2aa35a6da879a2124



Full URL: https://github.com/mbedmicro/mbed/commit/5b145e4f6c509376173c3ea2aa35a6da879a2124/



[TARGET_LPC11UXX] PeripheralNames.h and PinMap definitions separation for LPC11UXX platforms

Who changed what in which revision?

User	Revision	Line number	New contents of line
emilmont	10:3bc89ef62ce7	1	/* mbed Microcontroller Library
emilmont	10:3bc89ef62ce7	2	* Copyright (c) 2006-2013 ARM Limited
emilmont	10:3bc89ef62ce7	3	*
emilmont	10:3bc89ef62ce7	4	* Licensed under the Apache License, Version 2.0 (the "License");
emilmont	10:3bc89ef62ce7	5	* you may not use this file except in compliance with the License.
emilmont	10:3bc89ef62ce7	6	* You may obtain a copy of the License at
emilmont	10:3bc89ef62ce7	7	*
emilmont	10:3bc89ef62ce7	8	* http://www.apache.org/licenses/LICENSE-2.0
emilmont	10:3bc89ef62ce7	9	*
emilmont	10:3bc89ef62ce7	10	* Unless required by applicable law or agreed to in writing, software
emilmont	10:3bc89ef62ce7	11	* distributed under the License is distributed on an "AS IS" BASIS,
emilmont	10:3bc89ef62ce7	12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont	10:3bc89ef62ce7	13	* See the License for the specific language governing permissions and
emilmont	10:3bc89ef62ce7	14	* limitations under the License.
emilmont	10:3bc89ef62ce7	15	*/
mbed_official	227:7bd0639b8911	16	#include "mbed_assert.h"
emilmont	10:3bc89ef62ce7	17	#include "analogout_api.h"
emilmont	10:3bc89ef62ce7	18
emilmont	10:3bc89ef62ce7	19	#include "cmsis.h"
emilmont	10:3bc89ef62ce7	20	#include "pinmap.h"
emilmont	10:3bc89ef62ce7	21
emilmont	10:3bc89ef62ce7	22	static const PinMap PinMap_DAC[] = {
emilmont	10:3bc89ef62ce7	23	{P0_26, DAC_0, 2},
emilmont	10:3bc89ef62ce7	24	{NC , NC , 0}
emilmont	10:3bc89ef62ce7	25	};
emilmont	10:3bc89ef62ce7	26
emilmont	10:3bc89ef62ce7	27	void analogout_init(dac_t *obj, PinName pin) {
emilmont	10:3bc89ef62ce7	28	obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official	227:7bd0639b8911	29	MBED_ASSERT(obj->dac != (DACName)NC);
emilmont	10:3bc89ef62ce7	30
emilmont	10:3bc89ef62ce7	31	// power is on by default, set DAC clk divider is /4
emilmont	10:3bc89ef62ce7	32	LPC_SC->PCLKSEL0 &= ~(0x3 << 22);
emilmont	10:3bc89ef62ce7	33
emilmont	10:3bc89ef62ce7	34	// map out (must be done before accessing registers)
emilmont	10:3bc89ef62ce7	35	pinmap_pinout(pin, PinMap_DAC);
emilmont	10:3bc89ef62ce7	36
emilmont	10:3bc89ef62ce7	37	analogout_write_u16(obj, 0);
emilmont	10:3bc89ef62ce7	38	}
emilmont	10:3bc89ef62ce7	39
emilmont	10:3bc89ef62ce7	40	void analogout_free(dac_t *obj) {}
emilmont	10:3bc89ef62ce7	41
emilmont	10:3bc89ef62ce7	42	static inline void dac_write(int value) {
emilmont	10:3bc89ef62ce7	43	value &= 0x3FF; // 10-bit
emilmont	10:3bc89ef62ce7	44
emilmont	10:3bc89ef62ce7	45	// Set the DAC output
emilmont	10:3bc89ef62ce7	46	LPC_DAC->DACR = (0 << 16) // bias = 0
emilmont	10:3bc89ef62ce7	47	\| (value << 6);
emilmont	10:3bc89ef62ce7	48	}
emilmont	10:3bc89ef62ce7	49
emilmont	10:3bc89ef62ce7	50	static inline int dac_read() {
emilmont	10:3bc89ef62ce7	51	return (LPC_DAC->DACR >> 6) & 0x3FF;
emilmont	10:3bc89ef62ce7	52	}
emilmont	10:3bc89ef62ce7	53
emilmont	10:3bc89ef62ce7	54	void analogout_write(dac_t *obj, float value) {
emilmont	10:3bc89ef62ce7	55	if (value < 0.0f) {
emilmont	10:3bc89ef62ce7	56	dac_write(0);
emilmont	10:3bc89ef62ce7	57	} else if (value > 1.0f) {
emilmont	10:3bc89ef62ce7	58	dac_write(0x3FF);
emilmont	10:3bc89ef62ce7	59	} else {
emilmont	10:3bc89ef62ce7	60	dac_write(value * (float)0x3FF);
emilmont	10:3bc89ef62ce7	61	}
emilmont	10:3bc89ef62ce7	62	}
emilmont	10:3bc89ef62ce7	63
emilmont	10:3bc89ef62ce7	64	void analogout_write_u16(dac_t *obj, uint16_t value) {
emilmont	10:3bc89ef62ce7	65	dac_write(value >> 6); // 10-bit
emilmont	10:3bc89ef62ce7	66	}
emilmont	10:3bc89ef62ce7	67
emilmont	10:3bc89ef62ce7	68	float analogout_read(dac_t *obj) {
emilmont	10:3bc89ef62ce7	69	uint32_t value = dac_read();
emilmont	10:3bc89ef62ce7	70	return (float)value * (1.0f / (float)0x3FF);
emilmont	10:3bc89ef62ce7	71	}
emilmont	10:3bc89ef62ce7	72
emilmont	10:3bc89ef62ce7	73	uint16_t analogout_read_u16(dac_t *obj) {
emilmont	10:3bc89ef62ce7	74	uint32_t value = dac_read(); // 10-bit
emilmont	10:3bc89ef62ce7	75	return (value << 6) \| ((value >> 4) & 0x003F);
emilmont	10:3bc89ef62ce7	76	}