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minimum build code for new APPROTECT is chip type-specific

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Peter Hansen
2023-12-03 13:47:26 -05:00
parent a31ae52d1a
commit dd62bb16e5
8 changed files with 10 additions and 2 deletions
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5
embassy-nrf/src/lib.rs
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@ -349,10 +349,11 @@ pub fn init(config: config::Config) -> Peripherals {
// Get the letter for the build code (b'A' .. b'F')
let build_code = (variant >> 8) as u8;
if build_code >= b'F' {
// Chips with build code F and higher (revision 3 and higher) have an
if build_code >= chip::APPROTECT_MIN_BUILD_CODE {
// Chips with a certain chip type-specific build code or higher have an
// improved APPROTECT ("hardware and software controlled access port protection")
// which needs explicit action by the firmware to keep it unlocked
// See https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/working-with-the-nrf52-series-improved-approtect
// UICR.APPROTECT = SwDisabled
let res = uicr_write(consts::UICR_APPROTECT, consts::APPROTECT_DISABLED);