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docs: faq: Fix link to bdma example and improve wording.

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Priit Laes 2024-05-28 11:27:21 +03:00
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@ -267,10 +267,10 @@ Additionally, some PWR settings require a full device reboot (and enough time to
There is not a fix for this yet, as it is board/hardware dependant. See link:https://github.com/embassy-rs/embassy/issues/2806[this tracking issue] for more details There is not a fix for this yet, as it is board/hardware dependant. See link:https://github.com/embassy-rs/embassy/issues/2806[this tracking issue] for more details
=== STM32 BDMA only work out of some RAM regions === STM32 BDMA only working out of some RAM regions
The STM32 BDMA controller included in some chips (TODO: list which ones) has a limitation in that it only works out of certain regions of RAM (TODO: list which ones), otherwise the transfer The STM32 BDMA controller included in some STM32H7 chips has to be configured to use only certain regions of RAM,
will fail. otherwise the transfer will fail.
If you see errors that look like this: If you see errors that look like this:
@ -279,7 +279,7 @@ If you see errors that look like this:
DMA: error on BDMA@1234ABCD channel 4 DMA: error on BDMA@1234ABCD channel 4
---- ----
You need to set up your linker script to define a special region for this area, and copy data to that region before using with BDMA. You need to set up your linker script to define a special region for this area and copy data to that region before using with BDMA.
General steps: General steps:
@ -289,7 +289,7 @@ General steps:
4. In your code, access the defined memory region using `#[link_section = ".xxx"]` 4. In your code, access the defined memory region using `#[link_section = ".xxx"]`
5. Copy data to that region before using BDMA. 5. Copy data to that region before using BDMA.
See link:/examples/stm32h7/src/bin/spi_bdma.rs[this example] for more details. See link:https://github.com/embassy-rs/embassy/blob/main/examples/stm32h7/src/bin/spi_bdma.rs[SMT32H7 SPI BDMA example] for more details.
== How do I switch to the `main` branch? == How do I switch to the `main` branch?