mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c
- Committer:
- janekm
- Date:
- 2014-09-16
- Revision:
- 310:6188e0254baa
- Parent:
- 286:31249416b6f9
File content as of revision 310:6188e0254baa:
/* 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 "mbed_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); MBED_ASSERT(obj->adc != (ADCName)NC); 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 = 1; // Sampling clock: SystemClock divided by 1 } 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