Swordfish

Jerry Many thanks - it works perfectly. I can even round the result based on the remainder. The calculation is that required to set the frequency for an Analog Devices AD9850 digital synthesizer. I'd built a version on picaxe but limited to 32 bit resolution which gives about 1:10000 resolution but ...

I need to calculate N=(B * 2^32)/125000000 where B is any integer between 1 and 40,000,000. In this case a lookup won't work.

Unless I'm missing something swordfish doesn't have a 64bit datatype - that is precisely the issue

Hi all I need to multiply two unsigned 32 bit integers to get a 64 bit result and then divide the answer by a 32 bit unsigned integer to give a 32 bit result. The nature of the numbers are such that the answer will always be in the 32 bit range. I'd appreciate any help on how to get started or point...

Thanks to the basis provided by octal I've produced a two way version of the slave i2c code working on a 14K22. The basis of the framework is that the master sends a command byte with bit 7 (go bit) set, followed by any number of data bytes. The interrupt routine on the slave reads and stores the da...

Octal

Thanks for the link

I did use search - honest:-) but didn't check that thread as I assumed the title related to a software i2c implemetation (SI2C) duh....

Did you ever do the upgrade for the newer devices? I'm using 14K22 in this project

Thanks
Peter

I've searched but can't find any reference to this.

Has anyone built code to use a a pic in i2c slave mode that they can share?

Thanks

Peter

Jerry I've now got to the bottom of the issue but don't understand the problem. I had got that code in the version of system.bas in my user library. I'm fairly certain that I had previously found that you don't need to explicitly "include system.bas" which is why it wasn't in my code. However, by ex...

Jerry I'm using a version of DS30 which I have modified to use a software uart on the picaxe 28x2 pins (quite pleased with myself on this!). The problem was the software executing the "not enabled" code when the inputs were set as "enabled" and correctly read as such. Senacharim - thanks for the ide...

As requested. The variables that were booleans are StepDirection,stepactive,Decayout and the changes in the code are just replacement of "x=true" and "if x" wherever they appear. Best regards Peter // if device and clock are omitted, then the compiler defaults to // 18F452 @ 20MHz - they are just us...

Hi all I'm using 2.2.1.3 registered and have had an issue using booleans. I had defined three booleans Dim a,b,c as boolean was using them through the code e.g. a=true if a then ... endif The definition was the last of my variable definitions. I was getting results which indicated that one of the bo...

Ryan I've got both 25K22 and 26K22 working well with SF after Jerry's help. See http://www.sfcompiler.co.uk/forum/viewtopic.php?t=1481 for essential changes to setalldigital needed for these chips which must be called before using i2c etc.. The issue is that there are key registers not in the access...

There is a bug in the cos routine (and therefore also sine) when the angle in radians is too large. This is demonstrated in the attached test program { **************************************************************** * Name : I2C EEPROM * * Author : David John Barker * * Notice : Copyright (c) 2006 ...

I'm building avionics for a homebuilt aircraft . Current project is an EGT system to get best possible leaning

When repeatedly programming a chip it is occasionally the case that an i2c peripheral is in the middle of a write when the re-programming takes place. If the peripheral chip is holding SDA low then the i2c start condition will not work to reset the peripheral and the program will probably not run pr...