frederic blanc / AnalogIn_Diff

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Fork of AnalogIn_Diff by Jim Carver

AnalohIn_Diff.cpp@2:ea5a4c22bd53, 2014-12-05 (annotated)

Committer:
fblanc
Date:
Fri Dec 05 14:06:38 2014 +0000
Revision:
2:ea5a4c22bd53
Parent:
1:7b36e4381d83 
Compatible hal freescale K64F

Who changed what in which revision?

UserRevisionLine numberNew contents of line
fblanc 2:ea5a4c22bd53 1 /* mbed Microcontroller Library
fblanc 2:ea5a4c22bd53 2 * Copyright (c) 2006-2013 ARM Limited
fblanc 2:ea5a4c22bd53 3 *
fblanc 2:ea5a4c22bd53 4 * Licensed under the Apache License, Version 2.0 (the "License");
fblanc 2:ea5a4c22bd53 5 * you may not use this file except in compliance with the License.
fblanc 2:ea5a4c22bd53 6 * You may obtain a copy of the License at
fblanc 2:ea5a4c22bd53 7 *
fblanc 2:ea5a4c22bd53 8 * http://www.apache.org/licenses/LICENSE-2.0
fblanc 2:ea5a4c22bd53 9 *
fblanc 2:ea5a4c22bd53 10 * Unless required by applicable law or agreed to in writing, software
fblanc 2:ea5a4c22bd53 11 * distributed under the License is distributed on an "AS IS" BASIS,
fblanc 2:ea5a4c22bd53 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
fblanc 2:ea5a4c22bd53 13 * See the License for the specific language governing permissions and
fblanc 2:ea5a4c22bd53 14 * limitations under the License.
fblanc 2:ea5a4c22bd53 15 */
fblanc 2:ea5a4c22bd53 16
JimCarver 0:0f6f4be28e21 17 #include "AnalogIn_Diff.h"
JimCarver 0:0f6f4be28e21 18
fblanc 2:ea5a4c22bd53 19 #if FSL_FEATURE_ADC_HAS_DIFF_MODE
JimCarver 0:0f6f4be28e21 20
JimCarver 0:0f6f4be28e21 21 AnalogIn_Diff::~AnalogIn_Diff() { }
JimCarver 0:0f6f4be28e21 22
fblanc 2:ea5a4c22bd53 23 AnalogIn_Diff::AnalogIn_Diff(int adc_ch)
fblanc 2:ea5a4c22bd53 24 {
fblanc 2:ea5a4c22bd53 25 const uint32_t temp[] = ADC_BASE_ADDRS;
fblanc 2:ea5a4c22bd53 26 for (int i = 0; i < sizeof(temp) / sizeof(temp[0]); i++)
fblanc 2:ea5a4c22bd53 27 adc_addrs[i] = temp[i];
fblanc 2:ea5a4c22bd53 28
fblanc 2:ea5a4c22bd53 29
fblanc 2:ea5a4c22bd53 30 instance=(adc_ch>>1)&1;
fblanc 2:ea5a4c22bd53 31 chnNum=(adc_ch>>0)&1;
fblanc 2:ea5a4c22bd53 32
fblanc 2:ea5a4c22bd53 33
fblanc 2:ea5a4c22bd53 34 CLOCK_SYS_EnableAdcClock(instance);
fblanc 2:ea5a4c22bd53 35
fblanc 2:ea5a4c22bd53 36 uint32_t bus_clock;
fblanc 2:ea5a4c22bd53 37 CLOCK_SYS_GetFreq(kBusClock, &bus_clock);
fblanc 2:ea5a4c22bd53 38 uint32_t clkdiv;
fblanc 2:ea5a4c22bd53 39 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
fblanc 2:ea5a4c22bd53 40 if ((bus_clock >> clkdiv) <= MAX_FADC)
fblanc 2:ea5a4c22bd53 41 break;
fblanc 2:ea5a4c22bd53 42 }
fblanc 2:ea5a4c22bd53 43 if (clkdiv == 4) {
fblanc 2:ea5a4c22bd53 44 clkdiv = 0x3; //Set max div
fblanc 2:ea5a4c22bd53 45 }
fblanc 2:ea5a4c22bd53 46
fblanc 2:ea5a4c22bd53 47 /* adc is enabled/triggered when reading. */
fblanc 2:ea5a4c22bd53 48
fblanc 2:ea5a4c22bd53 49 ADC_HAL_Init(adc_addrs[instance]);
fblanc 2:ea5a4c22bd53 50 ADC_HAL_SetClkSrcMode(adc_addrs[instance], kAdcClkSrcOfBusClk);
fblanc 2:ea5a4c22bd53 51 ADC_HAL_SetClkDividerMode(adc_addrs[instance], (adc_clk_divider_mode_t)(clkdiv & 0x3));
fblanc 2:ea5a4c22bd53 52 ADC_HAL_SetRefVoltSrcMode(adc_addrs[instance], kAdcRefVoltSrcOfVref);
fblanc 2:ea5a4c22bd53 53 ADC_HAL_SetResolutionMode(adc_addrs[instance], kAdcResolutionBitOfDiffModeAs16);
fblanc 2:ea5a4c22bd53 54 ADC_HAL_SetContinuousConvCmd(adc_addrs[instance], false);
fblanc 2:ea5a4c22bd53 55 ADC_HAL_SetHwTriggerCmd(adc_addrs[instance], false); /* sw trigger */
fblanc 2:ea5a4c22bd53 56 ADC_HAL_SetHwAverageCmd(adc_addrs[instance], false);
fblanc 2:ea5a4c22bd53 57 //ADC_HAL_SetHwAverageMode(adc_addrs[instance], kAdcHwAverageCountOf4);
fblanc 2:ea5a4c22bd53 58 ADC_HAL_SetChnMuxMode(adc_addrs[instance], kAdcChnMuxOfB); /* only B channels are avail */
fblanc 2:ea5a4c22bd53 59
fblanc 2:ea5a4c22bd53 60
JimCarver 0:0f6f4be28e21 61 }
JimCarver 0:0f6f4be28e21 62
fblanc 2:ea5a4c22bd53 63
fblanc 2:ea5a4c22bd53 64
fblanc 2:ea5a4c22bd53 65
fblanc 2:ea5a4c22bd53 66 int16_t AnalogIn_Diff::read_raws16() // Returns a 16bit signed integer
fblanc 2:ea5a4c22bd53 67 {
fblanc 2:ea5a4c22bd53 68 /* sw trigger (SC1A) */
fblanc 2:ea5a4c22bd53 69 ADC_HAL_ConfigChn(adc_addrs[instance], 0, false, true, chnNum);
fblanc 2:ea5a4c22bd53 70 while (!ADC_HAL_GetChnConvCompletedCmd(adc_addrs[instance], 0));
fblanc 2:ea5a4c22bd53 71 return ADC_HAL_GetChnConvValueRAW(adc_addrs[instance], 0);
JimCarver 0:0f6f4be28e21 72 }
fblanc 2:ea5a4c22bd53 73
fblanc 2:ea5a4c22bd53 74 float AnalogIn_Diff::read()
fblanc 2:ea5a4c22bd53 75 {
fblanc 2:ea5a4c22bd53 76 int16_t value = read_raws16();
fblanc 2:ea5a4c22bd53 77 return (float)value * (1.0f / (float)0xFFFF);
fblanc 2:ea5a4c22bd53 78 }
fblanc 2:ea5a4c22bd53 79
fblanc 2:ea5a4c22bd53 80 #endif // FSL_FEATURE_ADC_HAS_DIFF_MODE