A set of C routines for providing useful facilities via bit-banging instead of specific hardware ( i2c master, uart tx ). While the code tries to be as generic as reasonable, it has been written around the avr-gcc / libc toolchain and Atmel Tiny AVR 1-series chips. To avoid the code becoming a visually complex mess and thus unreadable for new people I've deliberately avoided having all manner of self-configuring/detecting routines to determine the specific ports/functions to use. Most people should be able to read the code and adapt if required for their specific situation.
Very simple transmit-only, no checks, 9600-8n1 function. Can be useful when you're in a fix and want to get data out via a serial port but either you've routed the pins elsewhere, don't have hardware support or you just don't care to use the integrated hardware.
Set the SET_0, SET_1, and DELAY defines to suit your setup, likewise the F_CPU/F_OSC.
Created with the AVR Tiny414 / 1-Series AVRs
Should work on any pair of uC pins that support input and output. This was based off the flow-chart/sequences provided by the AVR300 document and one small adjustment in the byte-read sequence that made the multi-byte read sequences actually work ( before they wouldn't continue even when you had 'ack' set ).
Preconfigured for the common 16x2 LCD in 4-bit nibble mode, requiring D4..D7, RS, RW and E pins only. This code is designed as working-first and then you can always optimise it later if you require. Tested with ST7066 style controllers, though they're now almost all universal. If in doubt, check the datasheet.
Created with the AVR Tiny414 / 1-Series AVRs