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d3e856c56e
The always-on timer has an alarm comparator, but the RTC driver did not use it: rp23xx_rtc.c implemented only up_rtc_initialize(), up_rtc_time() and up_rtc_settime(). Add the alarm and an RTC lower half for /dev/rtc0: - rp23xx_rtc_setalarm(), rp23xx_rtc_cancelalarm() and rp23xx_rtc_rdalarm() on the ALARM_TIME registers and the POWMAN timer interrupt. - An RTC lower half with rdtime, settime, setalarm, setrelative, cancelalarm and rdalarm, registered by the common board bringup. The comparator asserts while the time is past the alarm time, not on a transition. So the interrupt handler disables the alarm before it does anything else; clearing only the status makes the interrupt repeat. The arming sequence is the one of powman_timer_enable_alarm_at_ms() in the Pico SDK. Assisted-by: Claude Code:claude-opus-5-5 Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com> |
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| arm | ||
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| avr | ||
| ceva | ||
| dummy | ||
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| mips | ||
| misoc | ||
| or1k | ||
| renesas | ||
| risc-v | ||
| sim | ||
| sparc | ||
| tricore | ||
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| xtensa | ||
| z16 | ||
| z80 | ||
| CMakeLists.txt | ||
| Kconfig | ||