Arduino for STM32

Code: Select all

pa0:129,0.10
pa0:161,0.13
pa0:252,0.20
pa0:288,0.23
pa0:326,0.26
pa0:350,0.28
pa0:378,0.30
pa0:398,0.32
pa0:388,0.31
pa0:458,0.37
pa0:455,0.37
pa0:463,0.37
pa0:484,0.39
pa0:501,0.40
pa0:510,0.41
pa0:502,0.40
pa0:508,0.41
pa0:508,0.41

Code: Select all

void setup() {
	//adc clk max 36mhz, using 84/4 ~ 21mhz
	adc_set_prescaler(ADC_PRE_PCLK2_DIV_4);
	adc_set_sampling_time(ADC1, adc_smp_rate::ADC_SMPR_480);
	...
}

Code: Select all

#include <Arduino.h>
#include <math.h>

void sleep(uint16_t msecs);

void setup() {
	Serial.begin();
	pinMode(LED_BUILTIN, OUTPUT);

	//adc clk max 36mhz, using 84/4 ~ 21mhz
	adc_set_prescaler(ADC_PRE_PCLK2_DIV_4);
	adc_set_sampling_time(ADC1, adc_smp_rate::ADC_SMPR_84);
	pinMode(PA0, INPUT_ANALOG);

}

float f(float t, float v) {
	return 1777.3F - (10.888*(t-30)) - 0.00347*(t-30.0F)*(t-30.0F) - v;
}

float df(float t) {
	return -10.888*t - 0.00347*2*(t-30.0F);
}

float nstep(float t, float v) {
	return t - f(t,v) / df(t);
}

float newton(float v) {
    float t0 = 30.0F;
    float t;
    uint16_t n = 0;
    while(true) {
        t = nstep(t0, v);
        n++;
        if(fabs(t-t0) < 0.001)
            break;
        t0 = t;
    }
//    Serial.print("loop ");
//    Serial.println(n);
    return t;
}

void loop() {
	togglePin(LED_BUILTIN);
	Serial.print("pa0:");
	uint16_t val = analogRead(PA0);
	Serial.print(val);
	Serial.print(", ");
	float mv = 3.3 * (float) val * 1000.0 / 4096.0;
	Serial.print(mv);
	Serial.print("mV, ");
	Serial.print(newton(mv));
	Serial.println(" deg C");
	sleep(2000);
}

void sleep(uint16_t msecs) {
	for(uint16_t i=0; i<=msecs; i++)
		asm("wfi");
}