Error when running the `rng` example on `stm32l476rg`

[dzamlo]

When I try to run the rng example on my stm32l476rg I get the following error:

ERROR probe_rs::util::rtt: 
Error reading from RTT: Control block corrupted: write pointer is 1342572544 while buffer size is 1024 for "up" channel 0 (defmt)    
Frame 0: "HardFault handler. Cause: Escalated BusFault (Precise data access error) at location: 0xffffffff." @ 0x0800f552
Frame 1: "External interrupt #495." @ 0xffffffff
Error: CPU halted unexpectedly.

I have identified that it is the line let mut rng = Rng::new(p.RNG, Irqs); that cause the issue.

I have adapted the chip feature of embassy-stm32 in examples/stm32l4/Cargo.toml and the chip argument to probe-rs in examples/stm32l4/.cargo/config.toml.

Other examples work without any issue.

[dzamlo]

I was able to use git bisect to identify the commit where it starts to fail: 5c5e6818195b364199e583eb559b0042d392b3e7

[Dirbaio]

set config.rcc.clk48_src = Clk48Src::PLL1_Q. The default is HSI48, which that chip doesn't have.

(the reason that commit breaks it is it now requires specifying clk48_src explicitly, vs before it would try to guess it based on the enabled clocks)

[dzamlo]

Thanks, this works, sorry for the noise,