mbed library sources
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targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/analogin_api.c
- Committer:
- moirans2
- Date:
- 2015-01-14
- Revision:
- 445:9a3ffe6cfa19
- Parent:
- 409:a95c696104d3
File content as of revision 445:9a3ffe6cfa19:
/* 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 "adc_iodefine.h" #include "cpg_iodefine.h" #define ANALOGIN_MEDIAN_FILTER 1 #define ADC_12BIT_RANGE 0xFFF static const PinMap PinMap_ADC[] = { {P1_8, AN0, 1}, {P1_9, AN1, 1}, {P1_10, AN2, 1}, {P1_11, AN3, 1}, {P1_12, AN3, 1}, {P1_13, AN5, 1}, {P1_14, AN5, 1}, {P1_15, AN7, 1}, {NC, NC, 0} }; static volatile uint16_t *ADCDR[] = { &ADCADDRA, &ADCADDRB, &ADCADDRC, &ADCADDRD, &ADCADDRE, &ADCADDRF, &ADCADDRG, &ADCADDRH, }; #define ADC_RANGE ADC_12BIT_RANGE void analogin_init(analogin_t *obj, PinName pin) { obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); MBED_ASSERT(obj->adc != (ADCName)NC); CPGSTBCR3 &= ~(1 << 1); CPGSTBCR6 &= ~(1 << 7); // 000_0 000_1 00_00 0_xxx // 15: ADFlag 14: IntEn 13: start, [12:9] Triger..0 // [8:6] CLK 100 :: 12-bit 1054tclk // [5:3] scanmode 000 :: single mode // [2:0] channel select ADCADCSR = 0x01c0 ; for (int i = 0; i< sizeof(PinMap_ADC)/sizeof(PinMap); i++) { pinmap_pinout(PinMap_ADC[i].pin, PinMap_ADC); } //pinmap_pinout(pin, PinMap_ADC); } static inline uint32_t adc_read(analogin_t *obj) { // Select the appropriate channel and start conversion ADCADCSR &= 0xfff8; ADCADCSR |= (1 << 13 | (obj->adc&0x7)); // Repeatedly get the sample data until DONE bit #define nothing while ((ADCADCSR & (1 << 15)) == 0 || (ADCADCSR & (1<<13)) != 0) nothing; // clear flag ADCADCSR &= ~(1 << 15); return ((*(ADCDR[obj->adc]))>>4) & ADC_RANGE; // 12 bit } 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; //(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); }