SprinterのHEATER_DUTY_FOR_SETPOINTマクロ

定義

#define HEATER_DUTY_FOR_SETPOINT(setpoint) ((int)((187L*(long)setpoint)>>8)-27)

シミュレーション

function heater

clear;
close all;
%x=0:65535;
x=0:255;
y=heater_duty_for_setpoint(x);
plot(x,y,'b-');
title('HEATER DUTY FOR SETPOINT');

    function result=heater_duty_for_setpoint(setpoint)
        result = (bitshift((setpoint*187),-8))-27;
    end

end

近似直線と重ねてみた

function heater

clear;
close all;
%x=0:65535;
x=0:255;
y=heater_duty_for_setpoint(x)
a=(y(end)-y(1))/256;
z=a*x-27;
plot(x,y,'b-');
hold on;
plot(x,z,'r-');
title('HEATER DUTY FOR SETPOINT','FontSize',20);
s = sprintf('%f * x -27',a);
lgd = legend('((int)((187L*(long)setpoint)>>8)-27',s);
lgd.FontSize=14;
set(gca,'fontsize',14)
    function result=heater_duty_for_setpoint(setpoint)
        result = (bitshift((setpoint*187),-8))-27;
    end

end