[ECOS] Problem with f-format

[Tom Deconinck]

On Wed, Aug 20, 2008 at 3:59 PM, Andrew Lunn <andrew@lunn.ch> wrote:
> On Wed, Aug 20, 2008 at 03:27:42PM +0200, Robert Brusa wrote:
>> I am using ecos on a AT91SAM7X-EK-target. The routine shown below outputs
>> the three lines (to UART1):
>>
>> j:770 x:%f
>> j:
>> j:772 x:5.980000
>>
>> which is not what I would expect from the producing routine shown here:
>>
>>       void fproblem( void)
>>       {       //simple procedure to demonstrate problem with f-format
>>               unsigned int j = 770;
>>               float x = 5.98;
>>               diag_printf("\nj:%u x:%f", j, x);
>
> diag_printf does not implement float/double etc. It is supposed to be
> a lean/mean printf you can use in interrupt handlers, and other debug
> situations, not a full blown POSIX compatible printf.
>
>>               j++;
>>               printf("\nj:%u x:%f", j, x);
>
> You probably want to flush the stream. If i remember correctly, it
> only gets flushed when you write a \n, which you don't have here.
>
>>               char str[15];
>>               j++;
>>               sprintf(str, "\nj:%u x:%f", j, x);
>>               diag_printf("%s", str);
>>       } // end fproblem
>
>        Andrew
>
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>
>

Andrew is right, you need the '\n' to flush the stream (I only know so
well because I've hit that brick all to often ;)

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