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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
targets/hal/TARGET_NXP/TARGET_LPC82X/analogin_api.c
- Committer:
- mbed_official
- Date:
- 2015-05-22
- Revision:
- 548:1abac31e188e
- Parent:
- 337:6ed01c00b962
File content as of revision 548:1abac31e188e:
/* 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 "analogin_api.h" #include "cmsis.h" #include "pinmap.h" #include "PeripheralNames.h" #if DEVICE_ANALOGIN #define ANALOGIN_MEDIAN_FILTER 1 #define ADC_RANGE 0xFFF static const PinMap PinMap_ADC[] = { {P0_7 , ADC_0, 0}, {P0_6 , ADC_1, 0}, {P0_14, ADC_2, 0}, {P0_23, ADC_3, 0}, {P0_22, ADC_4, 0}, {P0_21, ADC_5, 0}, {P0_20, ADC_6, 0}, {P0_19, ADC_7, 0}, {P0_18, ADC_8, 0}, {P0_17, ADC_9, 0}, {P0_13, ADC_10,0}, {P0_4 , ADC_11,0}, }; void analogin_init(analogin_t *obj, PinName pin) { obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); MBED_ASSERT(obj->adc != (ADCName)NC); LPC_SYSCON->SYSAHBCLKCTRL |= (1UL << 6); // pin enable LPC_SWM->PINENABLE0 &= ~(1UL << (13 + obj->adc)); // configure GPIO as input LPC_GPIO_PORT->DIR0 &= ~(1UL << (pin >> PIN_SHIFT)); LPC_SYSCON->PDRUNCFG &= ~(1 << 4); LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 24); __IO LPC_ADC_Type *adc_reg = LPC_ADC; // determine the system clock divider for a 500kHz ADC clock during calibration uint32_t clkdiv = (SystemCoreClock / 500000) - 1; // perform a self-calibration adc_reg->CTRL = (1UL << 30) | (clkdiv & 0xFF); while ((adc_reg->CTRL & (1UL << 30)) != 0); } static inline uint32_t adc_read(analogin_t *obj) { uint32_t channels; __IO LPC_ADC_Type *adc_reg = LPC_ADC; channels = (obj->adc & 0x1F); // select channel adc_reg->SEQA_CTRL &= ~(0xFFF); adc_reg->SEQA_CTRL |= (1UL << channels); // start conversion and sequence enable adc_reg->SEQA_CTRL |= ((1UL << 26) | (1UL << 31)); // Repeatedly get the sample data until DONE bit volatile uint32_t data; do { data = adc_reg->SEQA_GDAT; } while ((data & (1UL << 31)) == 0); // Stop conversion adc_reg->SEQA_CTRL &= ~(1UL << 31); return ((data >> 4) & ADC_RANGE); } static inline void order(uint32_t *a, uint32_t *b) { if (*a > *b) { uint32_t t = *a; *a = *b; *b = t; } } static inline uint32_t adc_read_u32(analogin_t *obj) { uint32_t value; #if ANALOGIN_MEDIAN_FILTER uint32_t v1 = adc_read(obj); uint32_t v2 = adc_read(obj); uint32_t v3 = adc_read(obj); order(&v1, &v2); order(&v2, &v3); order(&v1, &v2); value = v2; #else value = adc_read(obj); #endif return value; } uint16_t analogin_read_u16(analogin_t *obj) { uint32_t value = adc_read_u32(obj); return (value << 4) | ((value >> 8) & 0x000F); // 12 bit } float analogin_read(analogin_t *obj) { uint32_t value = adc_read_u32(obj); return (float)value * (1.0f / (float)ADC_RANGE); } #endif