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841-tinycore-micronucleus-vcc-header-test/SensorSerial.ino

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+/* -*-c++-*-
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+  This example code is in the public domain.
+ */
+
+/*
+  ./hardware/ATTinyCore/avr/cores/tinymodern/core_pins.h
+  Caution: reverse Pinout: PA3 => Pin 3
+
+  Nanite841 Pinout from above:
+
+              button
+SDO/MISO PA5          PA6 SDI/MOSI
+     SCK PA4          PA7
+     CS  PA3          PB2
+     RX0 PA2          PB2
+     TX0 PA1          PB1
+         PA0          PB0
+         GND          VCC
+               usb
+
+  Bosch BME280 Breakout from above pin header left:
+
+    VCC
+    GND
+    SCL  => SCK
+    SDI  => MOSI
+    CSB  => PA3/3
+    SDO  => MISO
+  
+ */
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include "841vcc.h"
+
+#define NODE_ID       1
+#define OUTPUT_PIN    7
+#define LED           2 //LED_BUILTIN  // PORTB2
+#define CS            3
+#define DELAY         2000
+
+#define SET_OUTPUT(pin) DDRB  |=  (1 << pin)
+#define SET_HIGH(pin)   PORTB |=  (1 << pin)
+#define SET_LOW(pin)    PORTB &= ~(1 << pin)
+
+void print_asufloat(uint32_t val, uint16_t factor) {
+  Serial.print(val / factor);
+  Serial.print(".");
+  Serial.print(val % factor);
+}
+
+void print_asifloat(int32_t val, uint16_t factor) {
+  Serial.print(val / factor);
+  Serial.print(".");
+  Serial.print(val % factor);
+}
+
+void print_measurements() {
+  float vcc;
+  
+  SET_LOW(LED);
+
+  adc_enable();
+  adc_start();
+  vcc = adc_get_vcc();
+  adc_disable();
+  
+  Serial.print("Voltage: ");
+  Serial.println(vcc);
+  
+  SET_HIGH(LED);
+}
+
+void halt() {
+  while(1);
+}
+
+
+void setup() {
+  SET_OUTPUT(LED);
+  Serial.begin(115200);
+  Serial.println("init");
+
+  adc_setup_vcc_measurement();
+}
+
+void loop() {
+  print_measurements();
+  delay(DELAY);
+}
+