dding pin reads for debugging

...ng/raspi4_freertos_rpmsg/open-amp/build/lib/libopen_amp.a

...4_freertos_rpmsg/samples/freertos/rpmsg_ping/build/main.o

...rtos_rpmsg/samples/freertos/rpmsg_ping/build/rpmsg-ping.o

...4_freertos_rpmsg/samples/freertos/rpmsg_ping/build/uart.o

...freertos_rpmsg/samples/freertos/rpmsg_ping/rpmsg_ping.elf

...reertos_rpmsg/samples/freertos/rpmsg_ping/rpmsg_ping.list

...pi4_freertos_rpmsg/samples/freertos/rpmsg_ping/src/main.c

...eertos_rpmsg/samples/freertos/rpmsg_ping/src/rpmsg-ping.c

...pi4_freertos_rpmsg/samples/freertos/rpmsg_ping/src/uart.c

...pi4_freertos_rpmsg/samples/freertos/rpmsg_ping/src/uart.h