> Giovanni Lovato wrote:
>> Maarten Brock wrote:
>>> Giovanni,
>>>
>>> In the embedded world "Hello World" is usually replaced by the much
>>> more basic "Blinky" application which only blinks a LED. After you
>>> have done that you have verified that your processor at least starts
>>> up and runs your program. Then it is time to start thinking about
>>> more sophisticated stuff like "Hello World". Where would you expect
>>> the output by the way? On the other end of the wireless connection
>>> maybe?
>>
>> I'm very new on the embedded world :)
>> To start, I would like to understand how to get a minimal application
>> compiled for CC2430 and be able to get a feedback of its correctness
>> when simulated with ucsim...
>
> So, no hints or suggestions? I tried a code found on the net:
>
> #include <stdio.h>
> #include <8051.h>
>
> void main (void) {
> SCON = 0x50; /* SCON: mode 1, 8-bit UART, enable rcvr */
> TMOD |= 0x20; /* TMOD: timer 1, mode 2, 8-bit reload */
> TH1 = 0xf3; /* TH1: reload value for 2400 baud */
> TR1 = 1; /* TR1: timer 1 run */
> TI = 1; /* TI: set TI to send first char of UART */
>
> printf("Hello, world!\n");
>
> while (1) {
> ;
> }
> }
>
> then compiled with `sdcc main.c' and tried to simulate:
>
> # echo run | s51 -s/dev/pts/1 main.ihx
>
> but I get no output on /dev/pts/1!
> What am I missing?
>
> Thank you!
Didn't you get any error or warning when you compiled this? I would expect
an unresolved putchar function. SDCC does not come with a default
implementation for putchar, because in an embedded application the
compiler doesn't know where the stdout output is supposed to go.
And since you're using the simulator why don't you set a breakpoint at
main and see where it goes step-by-step?
Maarten
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