Hello all, I have had some odd problems with a PR I am attempting to finalize:
cpu/atmega_common: RTT and RTC support https://github.com/RIOT-OS/RIOT/pull/8842 When working with the real-time timers, there are a number of times that you have to wait a few of the slow clock cycles to go by. I am using xtimer_usleep to sleep the thread temporarily. But! xtimer causes the code I am using to hang. Debugging it is difficult, because anything sending debug messages over UART causes the problems to disappear! I have been editing and running various numbers: xtimer_usleep(8); 8 and bigger fail xtimer_usleep(7); 7 and smaller work Bigger numbers make them fail! Here is a snippet of the offending code: > void __asynch_wait(uint8_t num_cycles) { > /* Wait until all busy flags clear */ > while( ASSR & ((1 << TCN2UB) | (1 << OCR2AUB) | (1 << OCR2BUB) > | (1 << TCR2AUB) | (1 << TCR2BUB)) ) { > #ifdef MODULE_XTIMER > /* Sleep for num_cycles RTC cycles */ > xtimer_usleep(num_cycles * 35 * US_PER_MS); > #else > /* Suppress unused parameter warning */ > (void)num_cycles; > > thread_yield(); > #endif > } > } Anyone have any ideas on what is going on? Sincerely, Matthew _______________________________________________ devel mailing list devel@riot-os.org https://lists.riot-os.org/mailman/listinfo/devel
