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Arduboy-homemade-package
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Update README.md

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@ -50,7 +50,10 @@ This package contains all the currently available Arduboy libraries with changes
|----------------- | ---------------------- | ----------- | ---------------------------------- | --------------------------------- |
| CART_CS | 0 PORTD2*** | - | - | 0 PORTD2*** |
| SPI MISO | 14 PORTB3*** | - | - | 14 PORTB3*** |
|----------------- | ---------------------- | ----------- | ---------------------------------- | --------------------------------- |
| OLED SDA | 4 PORTD4***** | - | 4 PORTD4***** | 4 PORTD4***** |
| OLED SCL | 6 PORTD7***** | - | 6 PORTD7***** | 1/TXO PORTD3***** |
Numbers before the portnames are Arduino assigned pin numbers.
(*)
@ -72,10 +75,17 @@ Flash cart support:
(****)
When using serial flash with the Pro Micro standard wiring, OLED_CS (chip select) cannot be grounded (always active).
In this case a simple circuit with a general purpose PNP transistor and two resistors can be used to deactive OLED_CS while CART_CS is active.
In this case a simple circuit with a general purpose PNP transistor and two resistors or a single inverter chip like the 74LVC1G04 can be used to deactive OLED_CS while CART_CS is active.
**TODO** add schematic
(*****)
support for I2C displays has been added. When using an I2C display the SDA pin should be connected to pin 4 PORTD4 and the displays SCL pin to pin 6 PORTD7 unless you're using a Pro Micro with the alternate wiring scherme. In that case SCL pin should be connected to pin 1/TXO PORTD3.
Note that updating a I2C display is slower than a SPI display. To get the most out of an I2C display, the display update code is optimized using assembly and bitbangs the display at 2 Mbps or 2,66 Mbps (uses more progmem).
At 2 Mbps the display update will be 4.3 times slower than when a SPI display is used and 3.1 times slower at 2.66 Mbps. Games will still run smootly at 60 FPS when the main program requires less than %70 (2Mbps) or 78% (2.66Mbps) of MCU power.
## (future) expansion connector
An expansion connector can be added to a modified or Homemade Arduboy in the form of a 12 pin male header with 0.1"pitch. which can be used for: