Add script for remaining stack memory graphing

utils/nrf-debugging/binary.elf

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+../../runners/embedded/artifacts/runner-nrf52-bootloader-nk3am.elf

utils/nrf-debugging/gdb-stack.cmds

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+set pagination off
+set logging file gdb.txt
+set logging on
+
+set architecture arm
+set endian little
+set arm fallback-mode thumb
+set arm force-mode thumb
+set style enabled off
+file binary.elf
+target remote :3333
+
+
+define stepinf
+    while(1)
+	p $msp
+    step
+    end
+end
+
+# Automatically start tracing upon reaching the following line
+# b transport.rs:181
+# commands
+# stepinf
+# end

utils/nrf-debugging/graph_stack.py

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+from matplotlib import pyplot as plt
+
+"""
+Quickly graph gdb msp prints.
+
+rg -F "= (*mut ()) " gdb.txt > gdb.txt.stack
+
+Expected format is like:
+
+...
+$38057 = (*mut ()) 0x2001b478
+$38058 = (*mut ()) 0x2001b478
+...
+
+"""
+
+PATH = 'gdb.txt.stack'
+
+def main():
+    data = []
+    with open(PATH, 'r') as f:
+        for line in f:
+            num = int(line.split()[-1], 16)
+            num = num - 0x20000000
+            num = num // 1024
+            data.append(num)
+
+    print(len(data))
+    plt.plot(data)
+    plt.ylabel('free stack memory left [kB]')
+    plt.xlabel('sample no.')
+    plt.show()
+
+
+if __name__ == '__main__':
+    main()