[riot-notifications] [RIOT-OS/RIOT] cpu/sam3: added RTT driver (#7583)

Alexandre Abadie notifications at github.com
Wed Sep 13 13:51:45 CEST 2017


@haukepetersen, I gave a try to this one with `tests/periph_rtt`: it seems to work. Not sure if it's a problem or not but I noticed a (nearly) 1s time shift for each `Hello` triggered. See my output below:

2017-09-13 13:43:40,729 - INFO # Initializing the RTT driver
2017-09-13 13:43:40,730 - INFO # [rtt] setting prescaler to 32768
2017-09-13 13:43:40,731 - INFO # Setting initial alarm
2017-09-13 13:43:40,733 - INFO # [rtt] set new alarm to trigger at 10
2017-09-13 13:43:40,735 - INFO # Done setting up the RTT, wait for many Hellos
2017-09-13 13:43:51,954 - INFO # [rtt] ISR: state is 0x00000003
2017-09-13 13:43:51,958 - INFO # [rtt] set new alarm to trigger at 20
2017-09-13 **13:43:51,959** - INFO # Hello
2017-09-13 13:44:02,875 - INFO # [rtt] ISR: state is 0x00000003
2017-09-13 13:44:02,877 - INFO # [rtt] set new alarm to trigger at 30
2017-09-13 **13:44:02,878** - INFO # Hello
2017-09-13 13:44:13,792 - INFO # [rtt] ISR: state is 0x00000003
2017-09-13 13:44:13,795 - INFO # [rtt] set new alarm to trigger at 40
2017-09-13 **13:44:13,795** - INFO # Hello
2017-09-13 13:44:24,712 - INFO # [rtt] ISR: state is 0x00000003
2017-09-13 13:44:24,715 - INFO # [rtt] set new alarm to trigger at 50
2017-09-13 **13:44:24,715** - INFO # Hello


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