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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| atmel [2007/01/02 22:29] – herman | atmel [2018/12/30 00:13] (current) – external edit 127.0.0.1 | ||
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| * DDRx Data direction register (1: output, 0: input) | * DDRx Data direction register (1: output, 0: input) | ||
| * PINx Port input pins | * PINx Port input pins | ||
| + | |||
| ===== BIT manipulation in C ===== | ===== BIT manipulation in C ===== | ||
| * ~ means invert int -> ~_bv(5) means 11101111 not 00010000 | * ~ means invert int -> ~_bv(5) means 11101111 not 00010000 | ||
| Line 37: | Line 38: | ||
| * [[http:// | * [[http:// | ||
| - | ====== Reference | + | ====== Reference ====== |
| * [[http:// | * [[http:// | ||
| * [[http:// | * [[http:// | ||
| Line 45: | Line 46: | ||
| * [[http:// | * [[http:// | ||
| + | * Handy command for debugging: avr-objdump -d $filename.elf > $filename.asm | ||
| ====== Interrupts ====== | ====== Interrupts ====== | ||
| All soft uart implementations use interrupts in one way or the other (timer and/or external). To understand them I'd like to test some more. | All soft uart implementations use interrupts in one way or the other (timer and/or external). To understand them I'd like to test some more. | ||