Add support for 8 & 16 bits sram traces and SH1106 OLED display #533
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This enables tracing of 16 bits IO registers, e.g. SP (SPH+SPL) as well as FW variables, e.g. heap (__brkval)
+ associated example/demo code
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Add support for (one commit for each):
SRAM tracing allows tracking of 16 bits registers, e.g. SP (Stack Pointer) as well as firmware variables, e.g. __brkval (Heap), that have no fixed adresses (using new AVR_MMCU_TAG_VCD_SRAM_8 and AVR_MMCU_TAG_VCD_SRAM_16 macro to populate the avr_mmcu_vcd_trace_t in the .mmcu section).
SH1106 demo code emulates a complex system (OLED display, joystick for navigation & buttons) integrating support for SRAM as well a Program Counter tracing from the command line.
This has been developped to analyze heap-stack margin and evolution over time in the following project: https://github.com/jpcornil-git/Cone2Hank.
VCD trace example:
https://github.com/jpcornil-git/simavr/tree/master/examples/board_sh1106#examples