Thanks, Jeff. I'll report back when I get back over to the lab and test it next week. I haven't used any other Modbus devices yet, so don't know how common this 32-bit float is.
-- Ralph ________________________________________ From: Jeff Epler [jep...@unpythonic.net] Sent: Friday, December 04, 2015 2:46 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] mb2hal and floating point conversions No existing component will take a 32-bit floating point number encoded as 2 16-bit "s32" values and output it as a HAL float. I wrote and gave a very small amount of testing to a component that does. component toieee """Interpret two 16-bit integers or one 32-bit integer as a 32-bit IEEE floating-point value"""; pin in s32 in-low "Low 16 bits OR full 32-bit floating point value"; pin in s32 in-high "High 16 bits OR zero"; pin in bit update "TRUE to update output, FALSE to hold current value"; pin out float out "Result of conversion"; license "GPL"; function _ """If update is TRUE, compute a new output value from the input values.""" ; ;; FUNCTION(_) { if(!update) return; union { uint32_t i; float f; } u; u.i = ((uint32_t) in_low) | (((uint32_t) in_high) << 16); out = u.f; // (automatically promoted from 32-bit float to 64-bit double) } For instance, treating the hex value 3EAAAAAB as a 32-bit IEEE float, it obtains a value close to 1/3: halcmd: setp toieee.0.update 1 halcmd: setp toieee.0.in-high 0x3eaa halcmd: setp toieee.0.in-low 0xaaab halcmd: getp toieee.0.out 0.3333333 However, if this is considered a "standard enough" modbus encoding then perhaps this decoding should be added directly into mb2hal. Jeff ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users