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This program provides basic wait routines. This code is a part of pAVRlib.
In examples/ and examples-C/ you'll find small test programs.
Initialize
Define F_CPU.
.equ F_CPU = XXXXXX ; system frequency in Hze.g.
.equ F_CPU = 1000000 ; in case of f = 1 MHz
F_CPU > 30 MHz is not supported (yet).
Subroutines
These routines are not so exact (ca. 1-2 % error). Use timer if you need exact delays.
void Wait1ms() (in: (none), out: (none))
wait ca. 1 ms
void Waitms(unsigned char) (in: r24, out: (none))
wait ca. n ms (n = r24)
void Waitmsint(unsigned int) (in: r25:r24, out: (none))
wait ca. n ms (n = r25:r24)
void Wait1sec() (in: (none), out: (none))
wait ca. 1 s
void Waitsec(unsigned char) (in: r24, out: (none))
wait ca. n s (n = r24)
Example
To wait 5 seconds, use:
ldi r24, 5
rcall WaitsecUsing with GCC
This program can be used with GCC, but it is recommended to use the standard library.
See examples-C/wait-test.c.