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(FAQ): Add time driver note

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James Munns 2023-11-27 21:42:10 +01:00 committed by GitHub
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docs/modules/ROOT/pages/faq.adoc
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@ -80,3 +80,39 @@ unsafe fn HardFault(_frame: &ExceptionFrame) -> ! {
---- ----
Refer to cortex-m's link:https://docs.rs/cortex-m-rt/latest/cortex_m_rt/attr.exception.html[exception handling] for more info. Refer to cortex-m's link:https://docs.rs/cortex-m-rt/latest/cortex_m_rt/attr.exception.html[exception handling] for more info.
== `embassy-time` throws linker errors
If you see linker error like this:
[source,text]
----
= note: rust-lld: error: undefined symbol: _embassy_time_now
>>> referenced by driver.rs:127 (src/driver.rs:127)
>>> embassy_time-846f66f1620ad42c.embassy_time.4f6a638abb75dd4c-cgu.0.rcgu.o:(embassy_time::driver::now::hefb1f99d6e069842) in archive Devel/Embedded/pogodyna/target/thumbv7em-none-eabihf/debug/deps/libembassy_time-846f66f1620ad42c.rlib
rust-lld: error: undefined symbol: _embassy_time_allocate_alarm
>>> referenced by driver.rs:134 (src/driver.rs:134)
>>> embassy_time-846f66f1620ad42c.embassy_time.4f6a638abb75dd4c-cgu.0.rcgu.o:(embassy_time::driver::allocate_alarm::hf5145b6bd46706b2) in archive Devel/Embedded/pogodyna/target/thumbv7em-none-eabihf/debug/deps/libembassy_time-846f66f1620ad42c.rlib
rust-lld: error: undefined symbol: _embassy_time_set_alarm_callback
>>> referenced by driver.rs:139 (src/driver.rs:139)
>>> embassy_time-846f66f1620ad42c.embassy_time.4f6a638abb75dd4c-cgu.0.rcgu.o:(embassy_time::driver::set_alarm_callback::h24f92388d96eafd2) in archive Devel/Embedded/pogodyna/target/thumbv7em-none-eabihf/debug/deps/libembassy_time-846f66f1620ad42c.rlib
rust-lld: error: undefined symbol: _embassy_time_set_alarm
>>> referenced by driver.rs:144 (src/driver.rs:144)
>>> embassy_time-846f66f1620ad42c.embassy_time.4f6a638abb75dd4c-cgu.0.rcgu.o:(embassy_time::driver::set_alarm::h530a5b1f444a6d5b) in archive Devel/Embedded/pogodyna/target/thumbv7em-none-eabihf/debug/deps/libembassy_time-846f66f1620ad42c.rlib
----
You probably need to enable a time driver for your HAL (not in `embassy-time`!). For example with `embassy-stm32`, you might need to enable `time-driver-any`:
[source,toml]
----
[dependencies.embassy-stm32]
version = "0.1.0",
features = [
# ...
"time-driver-any", # Add this line!
# ...
]
----