Tiny45 and Multiplication

Henrik · Joined: 14 Jul 2005 Posts: 13

Hello Friends,

let me report a little bug with the Tiny45:

Multiplication with a variabe as operand only works when the variable is dimensioned as LONG.

Example:

Dim test as word

test = 3*2 ...works

test = 2
test = test*3 ...doesnt work - result is 0

As soon as test is dim'ed as long that works correcctly. It's tricky to find such bugs, because the own programm is obviously flawless and works with other Megas and Tinys quite fine.

I would suggest to publish a list of known bugs for the new processors respectivly their Bascom regfiles.

M168 as a further example does not handle timers correctly and the clock function is out of order.

Best regards
Henrik

oe9vfj · Joined: 17 Jun 2004 Posts: 269 Location: Austria, Hard

Hi Henrik,

Tiny45 has no HW-Multiplyer, but in Dat-File this Parameter HWMUL is set to 1. Supporting of HW-Multiplying of a chip from BASCOM is now implemented for Byte and Word/Integer. So for this variable-types you get a wrong result.

Change the Line with HWMUL to
HWMUL=0
in the Dat-File.

I have no Tiny45 to try it and I haven't checked the other entries in the Dat-File.

Good Luck.

Henrik · Joined: 14 Jul 2005 Posts: 13

Hello Josef,

oe9vfj · Joined: 17 Jun 2004 Posts: 269 Location: Austria, Hard

Hello Henrik,

I made some tests of Flash Usage and found following values.

- The MUL-Routine itself for Word/Integer needs 104 Bytes (52 Words)
- One Calling of the Mul-Routine with loading the two Word/Integers to the CPU-Registers and storing the Result back to the SRAM needs 26 Bytes (13 Words)

So use Mul needs for

1 time = 130 Bytes
2 times = 156 Bytes
3 times = 182 Bytes
and so on.
Each MUL more needs 26 Bytes.

Can you please provide a code example which give you your mentioned code usage of 82 Bytes for each MUL.