added

841-tinycore-micronucleus-vcc-sleepmode-header-test/841sleep.h

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+../mylibs/841sleep.h

841-tinycore-micronucleus-vcc-sleepmode-header-test/841vcc.h

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+../mylibs/841vcc.h

841-tinycore-micronucleus-vcc-sleepmode-header-test/Makefile

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+# Arduino Make file. Refer to https://github.com/sudar/Arduino-Makefile
+
+# attiny841:
+#   BOARD_TAG          = attinyx41
+#   BOARD_SUB          = 841
+# attiny861:
+#   BOARD_TAG          = attinyx61
+#   BOARD_SUB          = 861
+# attiny85:
+#   BOARD_TAG          = attinyx5
+#   BOARD_SUB          = 85
+# attiny84:
+#   BOARD_TAG          = attinyx4
+#   BOARD_SUB          = 84
+
+ARDUINO_VERSION = 10810
+
+PROJECT_DIR              = $(shell pwd)
+BOARD_TAG                = attinyx41
+BOARD_SUB                = 841
+ARDUINO_DIR              = /usr/local/arduino
+ARDMK_DIR                = /usr/local/arduino/Arduino-Makefile
+MONITOR_PORT             = /dev/ttyACM0
+ISP_PORT                 = /dev/ttyACM0
+AVRDUDE                  = /usr/local/bin/avrdude
+ARDUINO_LIBS             = 
+ARDUINO_SKETCHBOOK       = .
+
+# mk stuff
+ALTERNATE_CORE           = ATTinyCore
+F_CPU                    = 8000000L
+MONITOR_BAUDRATE         = 115200
+AVRDUDE_ARD_PROGRAMMER   = stk500v2
+AVRDUDE_ARD_BAUDRATE     = 9600
+AVR_TOOLS_DIR            = /usr/local/avr
+AVRDUDE_CONF             = /usr/local/etc/avrdude.conf
+
+# Micronucleus
+MNINST                   = sudo micronucleus
+
+# compiler stuff
+CFLAGS_STD               = -std=gnu11
+CXXFLAGS_STD             = -std=gnu++11
+CXXFLAGS               + = -pedantic -Wall -Wextra
+CURRENT_DIR              = $(shell pwd)
+
+# keep this!
+include $(ARDMK_DIR)/Arduino.mk
+
+# install using micronucleus
+install: $(TARGET_HEX) verify_size
+	@echo "########### Press RESET on the Nanite! ##############"
+	$(MNINST) $(TARGET_HEX)

841-tinycore-micronucleus-vcc-sleepmode-header-test/README.md

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+# Usable Pins
+
+```
+PIN_A0  (10)
+PIN_A1  ( 9)
+PIN_A2  ( 8)
+PIN_A3  ( 7)
+PIN_A4  ( 6)
+PIN_A5  ( 5)
+PIN_A6  ( 4)
+PIN_A7  ( 3)
+PIN_B0  ( 0)
+PIN_B1  ( 1)
+PIN_B2  ( 2)
+PIN_B3  (11)  /* RESET */
+LED_BUILTIN (2)
+```

841-tinycore-micronucleus-vcc-sleepmode-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"
+#include "841sleep.h"
+
+#define NODE_ID       1
+#define OUTPUT_PIN    7
+#define LED           2 //LED_BUILTIN  // PORTB2
+#define CS            3
+#define DELAY         1000
+#define WDTREPEATS    3
+
+#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();
+  sleep_setup();
+}
+
+void loop() {
+  uint8_t i;
+  print_measurements();
+  delay(DELAY);
+  for(i=0; i<WDTREPEATS; i++) {
+    Serial.print("----- ENTER SLEEP: ");
+    Serial.println(i);
+    sleep_enter();
+    Serial.println("----- LEAVE SLEEP");
+  }
+  Serial.println("-- DONE");
+}
+
+sleep_vect();
+

841-tinycore-micronucleus-vcc-sleepmode-header-test/hardware

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+/usr/local/arduino/hardware

mylibs/841sleep.h

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+/*
+  Macros for easier sleep mode management
+  For Attiny841 only
+*/
+
+#include <avr/sleep.h>
+#include <avr/wdt.h>
+#include <avr/interrupt.h>
+
+#include "841vcc.h"
+
+#ifndef SLEEPMODE_8441_H
+#define SLEEPMODE_8441_H
+
+#ifndef SLEEPMODE
+  #define SLEEPMODE SLEEP_MODE_PWR_DOWN
+#endif
+
+#ifndef SLEEP_DURATION_BITS
+#define SLEEP_DURATION_BITS (_BV(WDP0) | _BV(WDP3)) // 8s
+#endif
+
+// define sleep mode
+// disable analog comparator 0 and 1
+// disable SPI
+// unlock Watchdog configuration register
+// enable the WD interrupt, set watchdog timeout prescaler value (interrupt period)
+// unlock clock configuration change
+// change clock prescaler to 8
+#define sleep_setup()                        \
+  set_sleep_mode(SLEEPMODE);                 \
+  ACSR0A |= _BV(ACD0);                       \
+  ACSR1A |= _BV(ACD1);                       \
+  CCP = 0xD8;                                \
+  WDTCSR = _BV(WDIE) | SLEEP_DURATION_BITS;  \
+  CCP = 0xD8;                                \
+  CLKPR = (_BV(CLKPS0) | _BV(CLKPS1));
+
+// FIXME: check!
+// PRR = 0xFF;
+
+
+// go into sleep mode and wake up after wtd timeout
+// also disable SPI
+#define sleep_enter()  \
+  adc_disable();       \
+  SPCR   &= ~_BV(SPE); \
+  sleep_enable();      \
+  sleep_mode();        \
+  sleep_disable();     \
+  SPCR = (1<<SPE)
+
+// nothing extra to do on wake up, just wake up
+#define sleep_vect() ISR(WDT_vect){}
+
+
+#endif