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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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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targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c
- Committer:
- mbed_official
- Date:
- 2014-05-25
- Revision:
- 211:fb8edfff6ae1
- Parent:
- 193:cff126de7aaf
- Child:
- 222:96162ccfbf43
File content as of revision 211:fb8edfff6ae1:
/* 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 "analogin_api.h" #include "cmsis.h" #include "pinmap.h" #include "error.h" #if DEVICE_ANALOGIN #define ANALOGIN_MEDIAN_FILTER 1 #define ADC_10BIT_RANGE 0x3FF #define ADC_12BIT_RANGE 0xFFF #define PDRUN_VALID_BITS 0x000025FFL #define PDRUN_RESERVED_ONE 0x0000C800L #define ADC_RANGE ADC_12BIT_RANGE static const PinMap PinMap_ADC[] = { {P1_9 , ADC_0, 3}, {P0_23, ADC_1, 1}, {P0_16, ADC_2, 1}, {P0_15, ADC_3, 3}, {P1_22, ADC_4, 3}, {P1_3 , ADC_5, 4}, {P0_14, ADC_6, 2}, {P0_13, ADC_7, 2}, {P0_12, ADC_8, 2}, {P0_11, ADC_9, 2}, {P1_29, ADC_10,4}, {P0_22, ADC_11,1}, {NC , NC ,0} }; void analogin_init(analogin_t *obj, PinName pin) { volatile uint32_t tmp; obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); if (obj->adc == (uint32_t)NC) { error("ADC pin mapping failed"); } pinmap_pinout(pin, PinMap_ADC); __IO uint32_t *reg = (__IO uint32_t*)(LPC_IOCON_BASE + (pin & 0x1FF)); // set pin to ADC mode *reg &= ~(1 << 7); // set ADMODE = 0 (analog mode) // ADC Powered tmp = (LPC_SYSCON->PDRUNCFG & PDRUN_VALID_BITS); tmp &= ~((1 << 4) & PDRUN_VALID_BITS); LPC_SYSCON->PDRUNCFG = (tmp | PDRUN_RESERVED_ONE); // Enable clock for ADC LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 13); // Start ADC self-calibration LPC_ADC->CTRL = (1UL << 30); do { tmp = LPC_ADC->CTRL; } while ((tmp & (1UL << 30)) != 0); LPC_ADC->CTRL = 100; // 500kHz sampling } static inline uint32_t adc_read(analogin_t *obj) { // select channel LPC_ADC->SEQA_CTRL &= ~(0xFFF); LPC_ADC->SEQA_CTRL |= (1UL << obj->adc); // start conversion, sequence enable with async mode LPC_ADC->SEQA_CTRL |= ((1UL << 26) | (1UL << 31) | (1UL << 19)); // Repeatedly get the sample data until DONE bit volatile uint32_t data; do { data = LPC_ADC->SEQA_GDAT; } while ((data & (1UL << 31)) == 0); data = LPC_ADC->DAT[obj->adc]; // Stop conversion LPC_ADC->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