Hello,
I'm having a problem getting some code to work, where the application
prints a message to the serial port, blocks while the uart transmits
data, then prints another message. I don't know whether I'm
misunderstanding the execution order or the use of atomic sections, but
here's the scenario:
There's a module, MyDebugger, with the following interface:
async command error_t write(uint8_t *msg); /* writes message to uart0 */
async event void writeDone(); /* write complete */
This is tested and works fine. Basically just a wrapper around the
UartStream provided by the Atm128 via PlatformSerial.
The problem is in my app:
bool blocking;
event void Boot.booted() {
bool tb = TRUE;
call MyDebugger.write("Booting, Part 1\r\n");
while (tb) {
atomic {
tb = blocking;
}
}
call MyDebugger.write("Booting, Part 2\r\n");
}
async event void MyDebugger.writeDone() {
atomic {
blocking = FALSE;
}
}
Running this program, all I get is the first line of output:
Booting, Part1
But it looks like the while loop in Boot.booted() never terminates. The
event handler is called. When I change it to:
async event void MyDebugger.writeDone() {
bool tb;
atomic {
tb = blocking;
blocking = FALSE;
}
if (tb) {
call MyDebugger.write("Got here\r\n");
}
}
Then I get:
Booting, Part 1
Got here
The while loop in Boot.booted() doesn't seem to pick up that the global
variable 'blocking' has changed.
Any clue as to why the app can't print the "Booting, Part 2" line?
Thanks very much,
Jeff
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