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The (precompiled) fade example on the web-conf is working but when compiled from Arduino IDE on the Neo itself and web IDE it does not work. Tested with RC2 (and apparently also not working on RC1). Pinmode was out-commented.
See for more information the forum: http://www.udoo.org/forum/threads/fade-example-not-working-in-m4.3917/

Hello,

I'm new here, and also not totally sure I'm understanding the error I'm getting. But I think I found a bug in the Udoo arduino-board-package.

The macro at line 105 in
https://github.com/UDOOboard/arduino-board-package/blob/boardmanager/udoo/sam/cores/arduino/avr/pgmspace.h
seems to have something wrong with it. It's causing Paul Stoffgren's Time library to not compile.

I found another bug report here
adafruit/Adafruit_nRF52_Arduino#502
that gave me a better idea of what the error output means.

Below is the error I'm getting when I try to compile a sketch when I include <TimeLib.h>

In file included from /home/davidian/.arduino15/packages/UDOO/hardware/sam/1.6.7/cores/arduino/Arduino.h:31:0,
from /home/davidian/Arduino/libraries/Time/DateStrings.cpp:12:
/home/davidian/Arduino/libraries/Time/DateStrings.cpp: In function 'char* monthStr(uint8_t)':
/home/davidian/.arduino15/packages/UDOO/hardware/sam/1.6.7/cores/arduino/avr/pgmspace.h:105:49: error: 'const void*' is not a pointer-to-object type
#define pgm_read_ptr(addr) ((const void )(addr))
^
/home/davidian/.arduino15/packages/UDOO/hardware/sam/1.6.7/cores/arduino/avr/pgmspace.h:63:45: note: in definition of macro 'strcpy_P'
#define strcpy_P(dest, src) strcpy((dest), (src))
^
/home/davidian/Arduino/libraries/Time/DateStrings.cpp:72:29: note: in expansion of macro 'pgm_read_ptr'
strcpy_P(buffer, (PGM_P)pgm_read_ptr(&(monthNames_P[month])));
^
/home/davidian/Arduino/libraries/Time/DateStrings.cpp: In function 'char dayStr(uint8_t)':
/home/davidian/.arduino15/packages/UDOO/hardware/sam/1.6.7/cores/arduino/avr/pgmspace.h:105:49: error: 'const void' is not a pointer-to-object type
#define pgm_read_ptr(addr) (*(const void *)(addr))
^
/home/davidian/.arduino15/packages/UDOO/hardware/sam/1.6.7/cores/arduino/avr/pgmspace.h:63:45: note: in definition of macro 'strcpy_P'
#define strcpy_P(dest, src) strcpy((dest), (src))
^
/home/davidian/Arduino/libraries/Time/DateStrings.cpp:86:28: note: in expansion of macro 'pgm_read_ptr'
strcpy_P(buffer, (PGM_P)pgm_read_ptr(&(dayNames_P[day])));
^
exit status 1
Error compiling for board UDOO QDL (Arduino Due).

Like describe here when we want to use CAN on A9 side if there is a scketch on M4 , CAN is not working ... This needs to disable M4 processor ... Suppose need to disable ECSPI5 by default in M4 core.

Is there a workaround to use SPI in its up to date version? Apparently the interface changed and so all depending libraries will not work with the older outdated SPI interface.

If I compile a previously working sketch from a few years ago, the updated libraries will not work anymore because the interface changed.

Do I need to downgrade all used libraries or is there any update available?