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+# OpenLog Artemis : How To Compile The OLA Firmware Binary
+
+These are  _abbreviated_ instructions on how to compile the OLA firmware. It's more of an aide-memoire really... Sorry about that.
+
+## Install Arduino IDE
+
+Tested version: 1.8.19
+
+(IDE version 2 has not been tested)
+
+## Add Apollo3 To The Additional Boards Manager URLs
+
+Open `File \ Preferences`
+
+Click the File icon to the right of the `Additional Boards Manager URLs` text box
+
+Add:
+
+```
+https://raw.githubusercontent.com/sparkfun/Arduino_Apollo3/master/package_sparkfun_apollo3_index.json
+```
+
+Click OK
+
+Click OK
+
+Close and re-open the IDE
+
+## Install the Apollo3 Board Package
+
+Open `Tools \ Board \ Boards Manager`
+
+Enter `Apollo3` in the search box
+
+Install the SparkFun Apollo3 Boards. Tested version: 2.2.1
+
+## Install All The Required Libraries
+
+Copy and paste the following into an empty sketch. Click on each link in turn to install the libraries via the Library Manager:
+
+```
+// SdFat by Bill Greiman (Tested version: 2.2.0): http://librarymanager/All#SdFat_exFAT
+// http://librarymanager/All#SparkFun_ICM_20948_IMU
+// http://librarymanager/All#SparkFun_I2C_Mux
+// http://librarymanager/All#SparkFun_CCS811
+// http://librarymanager/All#SparkFun_VL53L1X
+// http://librarymanager/All#SparkFun_BME280
+// http://librarymanager/All#SparkFun_LPS25HB
+// http://librarymanager/All#SparkFun_VEML6075
+// http://librarymanager/All#SparkFun_PHT_MS8607
+// http://librarymanager/All#SparkFun_MCP9600
+// http://librarymanager/All#SparkFun_SGP30
+// http://librarymanager/All#SparkFun_VCNL4040
+// http://librarymanager/All#SparkFun_MS5637
+// http://librarymanager/All#SparkFun_TMP117
+// http://librarymanager/All#SparkFun_u-blox_GNSS
+// http://librarymanager/All#SparkFun_NAU7802
+// http://librarymanager/All#SparkFun_SCD30
+// http://librarymanager/All#Qwiic_Humidity_AHT20
+// http://librarymanager/All#SparkFun_SHTC3
+// http://librarymanager/All#SparkFun_ADS122C04
+// http://librarymanager/All#SparkFun_MicroPressure
+// http://librarymanager/All#SparkFun_Particle_Sensor_SN-GCJA5
+// http://librarymanager/All#SparkFun_SGP40
+// http://librarymanager/All#SparkFun_SDP3x
+// Blue Robotics MS5837 (Required version: 1.1.1): http://librarymanager/All#BlueRobotics_MS5837
+// http://librarymanager/All#SparkFun_Qwiic_Button_Switch
+// http://librarymanager/All#SparkFun_Bio_Sensor
+// http://librarymanager/All#SparkFun_6DoF_ISM330DHCX
+// http://librarymanager/All#SparkFun_MMC5983MA
+// http://librarymanager/All#SparkFun_ADS1015
+// http://librarymanager/All#SparkFun_KX13X
+```
+
+## Download the OLA Firmware Zip
+
+Open this link in a web browser to download a complete Zip of the OLA firmware repo:
+
+https://github.com/sparkfun/OpenLog_Artemis/archive/refs/heads/main.zip
+
+Unzip it (Extract All files)
+
+## Copy the OLA Source Code
+
+Navigate to the Firmware sub-folder
+
+Copy the entire `OpenLog_Artemis` folder from the Zip file into your `Arduino` folder. This contains the source code for the firmware. The result should be:
+
+```
+C:\Users\<Your_User>\Documents\Arduino\OpenLog_Artemis
+```
+
+## Copy Paulvha's Patch for Apollo3
+
+Navigate to the `Extras` folder in the Zip file. Copy the `UartPower3.zip` file. Paste it into the Apollo3 board package folder. On Windows machines, this is (usually):
+
+```
+C:\Users\<Your_User>\AppData\Local\Arduino15\packages\SparkFun\hardware\apollo3
+```
+
+Unzip it (Extract All files)
+
+## Update the Apollo3 Core
+
+**Close the Arduino IDE**
+
+For information, open this link in a web browser: https://github.com/sparkfun/OpenLog_Artemis/issues/117#issuecomment-1085881142
+
+Follow Paul's instructions contained in `uart_power_3.odt`
+
+Summary: replace the following five files with the ones from `UartPower3.zip` :
+
+```
+C:\Users\<Your_User>\AppData\Local\Arduino15\packages\SparkFun\hardware\apollo3\2.2.1\cores\arduino\mbed-bridge\core-extend\HardwareSerial.h
+C:\Users\<Your_User>\AppData\Local\Arduino15\packages\SparkFun\hardware\apollo3\2.2.1\cores\arduino\mbed-bridge\core-implement\HardwareSerial.cpp
+C:\Users\<Your_User>\AppData\Local\Arduino15\packages\SparkFun\hardware\apollo3\2.2.1\cores\mbed-os\drivers\UnbufferedSerial.h
+C:\Users\<Your_User>\AppData\Local\Arduino15\packages\SparkFun\hardware\apollo3\2.2.1\cores\mbed-os\targets\TARGET_Ambiq_Micro\TARGET_Apollo3\device\serial_api.c
+C:\Users\<Your_User>\AppData\Local\Arduino15\packages\SparkFun\hardware\apollo3\2.2.1\variants\SFE_ARTEMIS_ATP\mbed\libmbed-os.a
+```
+
+## Update Apollo3 SPI.cpp
+
+Open the following file:
+
+```
+C:\Users\<Your_User>\AppData\Local\Arduino15\packages\SparkFun\hardware\apollo3\2.2.1\libraries\SPI\src\SPI.cpp
+```
+
+Search for `::end`
+
+Replace `::end` with:
+
+```
+void arduino::MbedSPI::end() {
+    if (dev) {
+        delete dev;
+        dev = NULL;
+    }
+}
+```
+
+Save the updated file
+
+The extra code prevents badness when the Artemis goes into deep sleep
+
+## Enable ICM29048 DMP Support
+
+Open the following file:
+
+```
+C:\Users\pc235\Documents\Arduino\libraries\SparkFun_ICM-20948_ArduinoLibrary\src\util\ICM_20948_C.h
+```
+
+Uncomment the following line (29):
+
+```
+#define ICM_20948_USE_DMP // Uncomment this line to enable DMP support. You can of course use ICM_20948_USE_DMP as a compiler flag too
+```
+
+Save the updated file
+
+## Compile / Upload the Code
+
+Re-open the Arduino IDE
+
+Open the main OLA Firmware .ino:
+
+```
+C:\Users\<Your_User>\Documents\Arduino\OpenLog_Artemis\OpenLog_Artemis.ino
+```
+
+Open the `Tools \ Board` menu. Select `SparkFun Apollo3 \ RedBoard Artemis ATP`
+
+If you have the OLA connected via USB, you can click the `Upload` (Right-Arrow) icon to compile the code and upload it onto the OLA
+
+(The compilation takes a long time. Go make a cup of tea...)
+
+If you want to be able to swap between firmware versions more quickly, use the `Sketch \ Export compiled Binary` to create a binary which
+you can upload with the `Artemis Firmware Upload GUI`. See [UPGRADE.md](./UPGRADE.md) for more details.
+
+## Board Versions
+
+If you are compiling for the Red (SparkFun) OLA: leave the hardware version defines as:
+
+```
+#define HARDWARE_VERSION_MAJOR 1
+#define HARDWARE_VERSION_MINOR 0
+```
+
+If you have an original Black (SparkX) OLA - way to go! Change those lines to:
+
+```
+#define HARDWARE_VERSION_MAJOR 0
+#define HARDWARE_VERSION_MINOR 4
+```
+
+## No Power Loss Protection
+
+To disable the sleep-on-power-loss functionality, uncomment this line:
+
+```
+#define noPowerLossProtection // Uncomment this line to disable the sleep-on-power-loss functionality
+```
+
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