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Hi, I'm working in this library with some useful DSP and math functions (ideally focusing on embedded systems). Currently it's in the initial version with few functions, but I hope to add more in the next update. I prefered to use some structs to save parameters and use just one function to various instances of filters (very versatile). Functions - High Pass Filter (Single pole): Float, fixed and fixed extended version (with more bits to fractional part) - Low Pass Filter (Single Pole): Float, fixed, fixed extended and fixed fast (with some limitations related to cuttof frequency, but more efficienty. - RMS value: calculate RMS value of an array or sample by sample. Currently using square root function of math.h, but in the next update I will add a optimized version. I hope this can be useful. Feel free to test, share and contribute with this project. Github: https://github.com/agaelema/DSP_and_Math
I would like to share with you this library. Is an embedded version of the famous "printf ( )". - https://github.com/agaelema/Embedded_Printf The start point was this post in the e2e where an user share a code. - http://e2e.ti.com/support/development_tools/code_composer_studio/f/81/p/30479/107146 I modified the code inserting new functions as binary notation, float notation, scientific notation, functions to convert numbers into strings and strings into numbers. The user can enable some #define enabling/disabling functions to use just what is useful. This is an resume comparison between the CCS native "printf" and this library (using th Launchpad EXP430FR6989 at 1MHz). - http://processors.wiki.ti.com/index.php/Printf_support_for_MSP430_CCSTUDIO_compiler To facilitate the port to other devices there is a separated file. Currently there are two ports: MSP430G2553 and MSP430FR6989. I hope it is useful.
I am currently playing with a nifty little module from Anaren called AIR (2pg pdf:http://www.anaren.com/sites/default/files/Part-Datasheets/A1101R09C.pdf), for a low-power embedded project and it works OK; but I was wondering if anyone else had experience with any other like type modules? My loose requirements are that I would like to reasonably (not pie-in-the-sky) hit 1/4 - 1/2 mile distances at slow speeds (9600 baud is fine). I would like to use an omni antenna (so no high directional antennas), would prefer the module to have pre-FCC approval, and would like the modules to be less than $15. Lower the power draw the better, but we know how that trade-off works! Those requirements really limit me, but the Anaren part seems like it could cover them; I am just curious what other things are out there that I might have missed. I am not married to the 900MHz spectrum, it just seemed like the most likely place for me to meet my goals. This is for an outdoor transmission.