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Mono Battery Voltage Sample
// This software is part of OpenMono, see http://developer.openmono.com
// and is available under the MIT license, see LICENSE.txt
#include "psoc_battery_voltage.h"
#include <mbed.h>
extern "C" {
#include <project.h>
}
using namespace mono::power;
uint16_t BatteryVoltage::mVoltage()
{
static bool isStarted = false;
if (!isStarted) {
ADC_SAR_1_Start();
isStarted = true;
}
// Disconnect AMUXBUSL
CY_SET_REG8(CYDEV_ANAIF_RT_SAR0_SW3, CY_GET_REG8(CYDEV_ANAIF_RT_SAR0_SW3) & ~0x01);
// Connect AG5
CY_SET_REG8(CYDEV_ANAIF_RT_SAR0_SW0, CY_GET_REG8(CYDEV_ANAIF_RT_SAR0_SW0) | 0x20);
// Connect CMP2 to AG5
CY_SET_REG8(CYDEV_ANAIF_RT_CMP2_SW4, CY_GET_REG8(CYDEV_ANAIF_RT_CMP2_SW4) | 0x20);
// Connect vref to CMP2
CY_SET_REG8(CYDEV_ANAIF_RT_CMP2_SW3, CY_GET_REG8(CYDEV_ANAIF_RT_CMP2_SW3) | 0x20);
// wait for voltage level to settle
wait_us(20);
ADC_SAR_1_StartConvert();
ADC_SAR_1_IsEndConversion(ADC_SAR_1_WAIT_FOR_RESULT);
// disconnect CMP2 from vref and AG5, AG5 from ADC
CY_SET_REG8(CYDEV_ANAIF_RT_CMP2_SW4, CY_GET_REG8(CYDEV_ANAIF_RT_CMP2_SW4) & ~0x20);
CY_SET_REG8(CYDEV_ANAIF_RT_CMP2_SW3, CY_GET_REG8(CYDEV_ANAIF_RT_CMP2_SW3) & ~0x20);
CY_SET_REG8(CYDEV_ANAIF_RT_SAR0_SW0, CY_GET_REG8(CYDEV_ANAIF_RT_SAR0_SW0) & ~0x20);
// connect ADC to AMUXBUSL
CY_SET_REG8(CYDEV_ANAIF_RT_SAR0_SW3, CY_GET_REG8(CYDEV_ANAIF_RT_SAR0_SW3) | 0x01);
return CorrectionScale/ADC_SAR_1_GetResult16() + CorrectionOffset; // scale from 12 bit ADC to mV
}
// This software is part of OpenMono, see http://developer.openmono.com
// and is available under the MIT license, see LICENSE.txt
#ifndef psoc_battery_voltage_h
#define psoc_battery_voltage_h
#include <stdint.h>
namespace mono { namespace power {
class BatteryVoltage
{
public:
static const uint32_t RawAdcMax = 0xFFF;
static const uint32_t ReferenceVoltage = 0x400;
static const uint32_t CorrectionFactor = 1588;
static const uint32_t CorrectDenominator = 1000;
static const uint32_t CorrectionOffset = 440;
static const uint32_t CorrectionScale =
RawAdcMax*CorrectionFactor/CorrectDenominator*ReferenceVoltage;
static uint16_t mVoltage();
};
} }
#endif /* psoc_battery_voltage_h */
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