Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/analogin_api.c
- Revision:
- 18:6a4db94011d3
diff -r f713758f6238 -r 6a4db94011d3 mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/analogin_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/analogin_api.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,200 @@ +/** + ****************************************************************************** + * @file adc_sar.c + * @brief Implementation of a SAR ADC driver + * @internal + * @author ON Semiconductor + * $Rev: + * $Date: + ****************************************************************************** + * Copyright 2016 Semiconductor Components Industries LLC (d/b/a ON Semiconductor). + * All rights reserved. This software and/or documentation is licensed by ON Semiconductor + * under limited terms and conditions. The terms and conditions pertaining to the software + * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf + * (ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software) and + * if applicable the software license agreement. Do not use this software and/or + * documentation unless you have carefully read and you agree to the limited terms and + * conditions. By using this software and/or documentation, you agree to the limited + * terms and conditions. + * + * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED + * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. + * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, + * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. + * @endinternal + * + * @ingroup adc_sar + * + * @details + * <p> + * </p> + * + */ + +#include "device.h" +#include "analogin_api.h" +#include "PeripheralPins.h" +#include "mbed_assert.h" +#include "clock.h" +#include "adc_sar.h" + +#if DEVICE_ANALOGIN + +/** + * \defgroup hal_analogin Analogin hal functions + * @{ + */ + +/** Initialize the analogin peripheral + * + * Configures the pin used by analogin. + * @param obj The analogin object to initialize + * @param pin The analogin pin name + */ +void analogin_init(analogin_t *obj, PinName pin) +{ + CLOCK_ENABLE(CLOCK_ADC); + ADCName adc; + uint8_t adc_pin = 0; + + adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); + MBED_ASSERT(adc != (ADCName)NC); + + obj->adcReg = (AdcReg_pt)adc; + obj->pin = pin; + obj->pinFlag = 1; + obj->ADC_Offset_Value = TRIMREG->ADC_OFFSET_TRIM; + + switch (pin) { + case A0: + adc_pin=0; + break; + case A1: + adc_pin = 1; + break; + case A2: + adc_pin = 2; + break; + case A3: + adc_pin = 3; + break; + default: + break; + } + + /* If no config parameters are passed on; assume default value */ + if (obj->adcConf == Null) { + /* Single sample, absolute conversion, scale = 1 */ + obj->adcReg->CONTROL.WORD = ((0 << ADC_CONTROL_MODE_BIT_POS) | + (1 << ADC_CONTROL_MEASTYPE_BIT_POS) | + (6 << ADC_CONTROL_INPUTSCALE_BIT_POS) | + (((uint8_t)adc_pin) << ADC_CONTROL_MEAS_CH_BIT_POS)); + + /* Prescaler enabled; set to 7 */ + obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) | + (7 << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */ + + obj->adcReg->DELAY.WORD = ((0x34 << ADC_DELAY_SAMPLE_RATE_BIT_POS) | /** 25 uS Sets the sample rate in units of PCLKperiod * (Prescale + 1). */ + (0x05 << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */ + (0x1A << ADC_DELAY_SAMPLE_TIME_BIT_POS)); /** 2.5 uS Sets the warm-up time in units of PCLKperiod * (Prescale + 1). */ + + obj->adcReg->IR = 0; /** No interrupt generated */ + } else { + obj->adcConf->convCh = adc_pin; + + /* ADC register settings */ + if((obj->adcConf->measurementType) == ADC_RELATIVE_MEAS) { + obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) | + (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) | + (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) | + (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS) | + (obj->adcConf->referenceCh << ADC_CONTROL_REF_CH_BIT_POS)); + } else { + obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) | + (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) | + (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) | + (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS)); + } + + obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) | + (obj->adcConf->PrescaleVal << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */ + + obj->adcReg->DELAY.WORD = ((obj->adcConf->samplingRate << ADC_DELAY_SAMPLE_RATE_BIT_POS) | /** 25 uS Sets the sample rate in units of PCLKperiod * (Prescale + 1). */ + (obj->adcConf->WarmUpTime << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */ + (obj->adcConf->samplingTime << ADC_DELAY_SAMPLE_TIME_BIT_POS)); /** 2.5 uS Sets the warm-up time in units of PCLKperiod * (Prescale + 1). */ + + obj->adcReg->IR = obj->adcConf->interruptConfig; /** Interrupt setting */ + } + + /* Enable interrupt */ + NVIC_ClearPendingIRQ(Adc_IRQn); + NVIC_EnableIRQ(Adc_IRQn); +} + +/** Read the input voltage, represented as a float in the range [0.0, 1.0] + * + * @param obj The analogin object + * @return A floating value representing the current input voltage + */ +float analogin_read(analogin_t *obj) +{ + float retVal = 0.0; + uint16_t value = analogin_read_u16(obj); + retVal = (float)value * (1.0f / (float)0x03FF); + return(retVal); +} + +/** Read the value from analogin pin, represented as an unsigned 16bit value + * + * @param obj The analogin object + * @return An unsigned 16bit value representing the current input voltage + */ +uint16_t analogin_read_u16(analogin_t *obj) +{ + uint16_t adcData = 0; + uint8_t adc_pin = 0; + + CLOCK_ENABLE(CLOCK_ADC); + + if (obj->pinFlag) { + switch (obj->pin) { + case A0: + adc_pin=0; + break; + case A1: + adc_pin = 1; + break; + case A2: + adc_pin = 2; + break; + case A3: + adc_pin = 3; + break; + default: + break; + } + + /* Re initialize the pin configured for ADC read */ + obj->adcReg->CONTROL.BITS.CONV_CH = adc_pin; + } + + obj->adcReg->CONTROL.BITS.START_CONV=1; /* Start The Conversion */ + + while((uint32_t)(obj->adcReg->STATUS)!=(uint32_t)1) { + } + adcData =(uint16_t)(obj->adcReg->DATA); + + /* Offset the ADC data with trim value */ + if (obj->ADC_Offset_Value != 0xFFFFFFFF) { + + if(adcData >= obj->ADC_Offset_Value) { + adcData -= obj->ADC_Offset_Value; + } + } + + return(adcData); +} + +#endif // DEVICE_ANALOGIN +