mirror of https://github.com/rusefi/wideband.git
39 lines
768 B
C++
39 lines
768 B
C++
#include "pump_dac.h"
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#include "pwm.h"
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#include "heater_control.h"
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#include "wideband_config.h"
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#include "hal.h"
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// 48MHz / 1024 = 46.8khz PWM
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static Pwm pumpDac(PWMD3, 0, 48'000'000, 1024);
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void InitPumpDac()
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{
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pumpDac.Start();
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// Set zero current to start - sensor can be damaged if current flowing
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// while warming up
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SetPumpCurrentTarget(0);
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}
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void SetPumpCurrentTarget(int32_t microampere)
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{
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// Don't allow pump current when the sensor isn't hot
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if (!IsRunningClosedLoop())
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{
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microampere = 0;
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}
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// 47 ohm resistor
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// 0.147 gain
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// effective resistance of 317 ohms
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float volts = -0.000321162f * microampere;
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// offset by half vcc
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volts += HALF_VCC;
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pumpDac.SetDuty(volts / VCC_VOLTS);
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}
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