On Tue, 14 Apr 2015 10:40:51 +0100, Matt Rhys-Roberts wrote: :: can anyone recommend trusted & reliable C libraries, a) :: for general SD file system operations, There is the code for the PIC24F from Microchips' 'Programming 16 bit=20 Microcontrollers in 'C' and from Microchips embeddedcodesource.com There is also the generic FAT FS from elm-chan.org ::for a RTC such as the DS1307? I have generic working code for the now obsolete DS1337 (this code is in a= =20 product as a Windows Timer) which you could have to play around with. From what I recall Maxim have generic code for their time clock devices=20 lurking in various areas around their site.=20 Colin -- cdb, colin@btech-online.co.uk on 26/04/2015 =20 Web presence: www.btech-online.co.uk =20 =20 Hosted by: www.justhost.com.au =20 =20 This email is to be considered private if addressed to a named individual= =20 or Personnel Department, and public if addressed to a blog, forum or news= =20 article. =20 =20 =20 and b) for a RTC such as the :: DS1307? --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .