tests/pyb: Add simple test for stm module on pyboard.

tests/pyb/modstm.py

@@ -0,0 +1,13 @@
+# test stm module
+
+import stm
+import pyb
+
+# test storing a full 32-bit number
+# turn on then off the A15(=yellow) LED
+BSRR = 0x18
+stm.mem32[stm.GPIOA + BSRR] = 0x00008000
+pyb.delay(100)
+print(hex(stm.mem32[stm.GPIOA + stm.GPIO_ODR] & 0x00008000))
+stm.mem32[stm.GPIOA + BSRR] = 0x80000000
+print(hex(stm.mem32[stm.GPIOA + stm.GPIO_ODR] & 0x00008000))

tests/pyb/modstm.py.exp

@@ -0,0 +1,2 @@
+0x8000
+0x0