81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/*
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Re: http://leaflabs.com/docs/hardware
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Arduino 1.6.0rc1 modifications by m. ray burnette
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Sketch uses 31,608 bytes (29%) of program storage space. Maximum is 108,000 bytes.
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Global variables use 3,752 bytes of dynamic memory.
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PUBLIC DOMAIN EXAMPLE
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*/
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//#include <stdio.h>
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#include <libmaple/adc.h>
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#define LED_PIN 33
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#define A_RANDOM_ANALOG_PIN 15
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void setup_temperature_sensor() {
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adc_reg_map *regs = ADC1->regs;
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// 3. Set the TSVREFE bit in the ADC control register 2 (ADC_CR2) to wake up the
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// temperature sensor from power down mode. Do this first 'cause according to
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// the Datasheet section 5.3.21 it takes from 4 to 10 uS to power up the sensor.
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regs->CR2 |= ADC_CR2_TSVREFE;
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// 2. Select a sample time of 17.1 μs
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// set channel 16 sample time to 239.5 cycles
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// 239.5 cycles of the ADC clock (72MHz/6=12MHz) is over 17.1us (about 20us), but no smaller
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// sample time exceeds 17.1us.
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regs->SMPR1 = (0b111 << (3*6)); // set channel 16, the temp. sensor
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}
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void setup(void)
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{
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// Set up the LED to blink
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pinMode(LED_PIN, OUTPUT);
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// set up an analog input. We want to test and make sure other analog reads don't screw this up.
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pinMode(A_RANDOM_ANALOG_PIN, INPUT_ANALOG);
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// wait for serial monitor to be connected.
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while (!Serial)
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{
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digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
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delay(100); // fast blink
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}
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// init tem psensor
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setup_temperature_sensor();
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// announce start up
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if(Serial)
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Serial.println("Temp mon startup");
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}
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//
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// once per second perform a standard analog read and read the temperature sensor
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// the analog read is to test whether our messing with the temp sensor will screw up analog reads
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// or visa versa.
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// Also compute and display the time each operation takes.
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//
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void loop(void)
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{
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uint16 vsense, alogpin;
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uint32 t1, t2, t3;
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char buf[64];
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t1 = micros();
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alogpin = analogRead(A_RANDOM_ANALOG_PIN);
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t2 = micros();
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vsense = adc_read(ADC1, 16);
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t3 = micros();
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if(Serial) {
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sprintf(buf,"%04x %08x %04x %08x" , vsense, t3-t2, alogpin, t2-t1);
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Serial.println(buf);
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}
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digitalWrite(33,!digitalRead(33));// Turn the LED from off to on, or on to off
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delay(1000);
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}
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