Hello,
I have been playing with the UART on the Mica2 mote and somehow I was not
able to receive data, e.g. to send data from the PC to the mote. So I
decided to look at the interrupt vector table of Surge, and it seems to me,
that the interrupt vector 19 (USART 0 Rx complete) points to "bad vector"
and thus is not handled correctly. The same seems to be true for TinyDB and
TestUartSimple.
Here the interrupt vector for the Surge application (taken from a .od file,
I used avr-objdump -zhD to convert it). I am using TinyOS 1.1.9 and nesc
1.1.2 with cygwin.
00000000 <__vectors>:
0: 0c 94 b5 01 jmp 0x36a
4: 0c 94 d2 01 jmp 0x3a4
8: 0c 94 d2 01 jmp 0x3a4
c: 0c 94 d2 01 jmp 0x3a4
10: 0c 94 d2 01 jmp 0x3a4
14: 0c 94 d2 01 jmp 0x3a4
18: 0c 94 d2 01 jmp 0x3a4
1c: 0c 94 d2 01 jmp 0x3a4
20: 0c 94 d2 01 jmp 0x3a4
24: 0c 94 d2 01 jmp 0x3a4
28: 0c 94 d2 01 jmp 0x3a4
2c: 0c 94 d2 01 jmp 0x3a4
30: 0c 94 d2 01 jmp 0x3a4
34: 0c 94 d2 01 jmp 0x3a4
38: 0c 94 d2 01 jmp 0x3a4
3c: 0c 94 3d 0c jmp 0x187a ---- vector 15 -> Timer 1
OVF
40: 0c 94 d2 01 jmp 0x3a4
44: 0c 94 f9 02 jmp 0x5f2 ---- vector 17 -> Timer 0
OVF
48: 0c 94 22 03 jmp 0x644 ---- vector 18 -> SPI
4c: 0c 94 d2 01 jmp 0x3a4 ---- vector 19 -> USART 0,
RX
-- however, it points to the "bad interrupt" area, just like unused ints ---
50: 0c 94 4c 03 jmp 0x698 ---- vector 20 -> USART 0,
UDRE
54: 0c 94 c9 0d jmp 0x1b92 ---- vector 21 -> USART 0,
Tx
58: 0c 94 d2 01 jmp 0x3a4
5c: 0c 94 d2 01 jmp 0x3a4
60: 0c 94 d2 01 jmp 0x3a4
64: 0c 94 d2 01 jmp 0x3a4
68: 0c 94 d2 01 jmp 0x3a4
6c: 0c 94 d2 01 jmp 0x3a4
70: 0c 94 d2 01 jmp 0x3a4
74: 0c 94 d2 01 jmp 0x3a4
78: 0c 94 d2 01 jmp 0x3a4
7c: 0c 94 d2 01 jmp 0x3a4
80: 0c 94 d2 01 jmp 0x3a4
84: 0c 94 d2 01 jmp 0x3a4
88: 0c 94 d2 01 jmp 0x3a4
....
000003a4 <__bad_interrupt>:
3a4: 0c 94 00 00 jmp 0x0
So can anybody (maybe someone from the developers at UCB) tell me, whether
this is the way it is supposed to be or not. If everything is alright, than
please tell me, what about the assumptions I did is wrong or how TinyOS
signals incoming USART data.
Thank you very much,
Olaf
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