working version with SPI w/o blinking

841-tinycore-micronucleus-bme280-spi-test/SensorSerial.ino

@@ -0,0 +1,82 @@
+/* -*-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
+  
+ */
+
+#define TINY_BME280_SPI
+#include <TinyBME280.h>
+
+#define LED LED_BUILTIN
+#define CS  3
+
+tiny::BME280 sensor;
+uint32_t pres, humidity;
+int32_t  temp;
+
+
+void print_measurements() {
+  temp     = sensor.readFixedTempC();
+  humidity = sensor.readFixedHumidity();
+  pres     = sensor.readFixedPressure();
+
+  Serial.print("     Temperature: ");
+  Serial.print(temp / 100.0);
+  Serial.println(" Grad C");
+  Serial.print("        Pressure: ");
+  Serial.print(pres / 100.0);
+  Serial.println(" hPa");
+  Serial.print("        Humidity: ");
+  Serial.print(humidity / 1000.0);
+  Serial.println(" %");
+  Serial.println();
+}
+
+void halt() {
+  while(1);
+}
+
+void setup() {
+  pinMode(LED, OUTPUT);
+  Serial.begin(115200);
+  Serial.println("init");
+  howlong = 500;
+  if(sensor.beginSPI(CS) == false) {
+    Serial.println("Sensor BME280 connect failed, check wiring!");
+    halt();
+  }
+  
+}
+
+void loop() {
+  print_measurements();
+  delay(2000);
+}
+