Можно так:
Код
<span style="font-family: monospace;"><span style="font-weight: bold;">static char format_buff[DEBUG_BUFF_SIZE];
void UartPrintf(const char *args, ...)
{
uint32_t len;
va_list ap;
va_start(ap, args);
len = vsnprintf(format_buff,sizeof(format_buff),args,ap);
va_end(ap);
UartWrite(format_buff,len);
}
</span></span>