differential input adc board K64F Compatible hal freescale K64F
Fork of AnalogIn_Diff by
AnalohIn_Diff.cpp
- Committer:
- fblanc
- Date:
- 2014-12-05
- Revision:
- 2:ea5a4c22bd53
- Parent:
- 1:7b36e4381d83
File content as of revision 2:ea5a4c22bd53:
/* 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_Diff.h" #if FSL_FEATURE_ADC_HAS_DIFF_MODE AnalogIn_Diff::~AnalogIn_Diff() { } AnalogIn_Diff::AnalogIn_Diff(int adc_ch) { const uint32_t temp[] = ADC_BASE_ADDRS; for (int i = 0; i < sizeof(temp) / sizeof(temp[0]); i++) adc_addrs[i] = temp[i]; instance=(adc_ch>>1)&1; chnNum=(adc_ch>>0)&1; CLOCK_SYS_EnableAdcClock(instance); uint32_t bus_clock; CLOCK_SYS_GetFreq(kBusClock, &bus_clock); uint32_t clkdiv; for (clkdiv = 0; clkdiv < 4; clkdiv++) { if ((bus_clock >> clkdiv) <= MAX_FADC) break; } if (clkdiv == 4) { clkdiv = 0x3; //Set max div } /* adc is enabled/triggered when reading. */ ADC_HAL_Init(adc_addrs[instance]); ADC_HAL_SetClkSrcMode(adc_addrs[instance], kAdcClkSrcOfBusClk); ADC_HAL_SetClkDividerMode(adc_addrs[instance], (adc_clk_divider_mode_t)(clkdiv & 0x3)); ADC_HAL_SetRefVoltSrcMode(adc_addrs[instance], kAdcRefVoltSrcOfVref); ADC_HAL_SetResolutionMode(adc_addrs[instance], kAdcResolutionBitOfDiffModeAs16); ADC_HAL_SetContinuousConvCmd(adc_addrs[instance], false); ADC_HAL_SetHwTriggerCmd(adc_addrs[instance], false); /* sw trigger */ ADC_HAL_SetHwAverageCmd(adc_addrs[instance], false); //ADC_HAL_SetHwAverageMode(adc_addrs[instance], kAdcHwAverageCountOf4); ADC_HAL_SetChnMuxMode(adc_addrs[instance], kAdcChnMuxOfB); /* only B channels are avail */ } int16_t AnalogIn_Diff::read_raws16() // Returns a 16bit signed integer { /* sw trigger (SC1A) */ ADC_HAL_ConfigChn(adc_addrs[instance], 0, false, true, chnNum); while (!ADC_HAL_GetChnConvCompletedCmd(adc_addrs[instance], 0)); return ADC_HAL_GetChnConvValueRAW(adc_addrs[instance], 0); } float AnalogIn_Diff::read() { int16_t value = read_raws16(); return (float)value * (1.0f / (float)0xFFFF); } #endif // FSL_FEATURE_ADC_HAS_DIFF_MODE