mspm0: read_reset_cause()

embassy-mspm0/CHANGELOG.md

@@ -18,3 +18,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - feat: add MSPM0H3216 support
 - feat: Add i2c target implementation (#4605)
 - fix: group irq handlers must check for NO_INTR (#4785)
+- feat: Add read_reset_cause function

embassy-mspm0/Cargo.toml

@@ -72,15 +72,15 @@ cortex-m = "0.7.6"
 critical-section = "1.2.0"
 
 # mspm0-metapac = { version = "" }
-mspm0-metapac = { git = "https://github.com/mspm0-rs/mspm0-data-generated/", tag = "mspm0-data-e7de4103a0713772695ffcad52c3c2f07414dc29" }
+mspm0-metapac = { git = "https://github.com/mspm0-rs/mspm0-data-generated/", tag = "mspm0-data-9726c26380da175a69030fee465b300954e22269" }
 
 [build-dependencies]
 proc-macro2 = "1.0.94"
 quote = "1.0.40"
 cfg_aliases = "0.2.1"
 
 # mspm0-metapac = { version = "", default-features = false, features = ["metadata"] }
-mspm0-metapac = { git = "https://github.com/mspm0-rs/mspm0-data-generated/", tag = "mspm0-data-e7de4103a0713772695ffcad52c3c2f07414dc29", default-features = false, features = ["metadata"] }
+mspm0-metapac = { git = "https://github.com/mspm0-rs/mspm0-data-generated/", tag = "mspm0-data-9726c26380da175a69030fee465b300954e22269", default-features = false, features = ["metadata"] }
 
 [features]
 default = ["rt"]

embassy-mspm0/src/lib.rs

@@ -234,3 +234,92 @@ impl Iterator for BitIter {
         }
     }
 }
+
+/// Reset cause values from SYSCTL.RSTCAUSE register.
+/// Based on MSPM0 L-series Technical Reference Manual Table 2-9 and
+/// MSPM0 G-series Technical Reference Manual Table 2-12.
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub enum ResetCause {
+    /// No reset since last read
+    NoReset,
+    /// VDD < POR- violation, PMU trim parity fault, or SHUTDNSTOREx parity fault
+    PorHwFailure,
+    /// NRST pin reset (>1s)
+    PorExternalNrst,
+    /// Software-triggered POR
+    PorSwTriggered,
+    /// VDD < BOR- violation
+    BorSupplyFailure,
+    /// Wake from SHUTDOWN
+    BorWakeFromShutdown,
+    /// Non-PMU trim parity fault
+    BootrstNonPmuParityFault,
+    /// Fatal clock fault
+    BootrstClockFault,
+    /// Software-triggered BOOTRST
+    BootrstSwTriggered,
+    /// NRST pin reset (<1s)
+    BootrstExternalNrst,
+    /// WWDT0 violation
+    BootrstWwdt0Violation,
+    /// WWDT1 violation (G-series only)
+    #[cfg(any(mspm0g110x, mspm0g150x, mspm0g151x, mspm0g310x, mspm0g350x, mspm0g351x))]
+    SysrstWwdt1Violation,
+    /// BSL exit (if present)
+    SysrstBslExit,
+    /// BSL entry (if present)
+    SysrstBslEntry,
+    /// Uncorrectable flash ECC error (if present)
+    SysrstFlashEccError,
+    /// CPU lockup violation
+    SysrstCpuLockupViolation,
+    /// Debug-triggered SYSRST
+    SysrstDebugTriggered,
+    /// Software-triggered SYSRST
+    SysrstSwTriggered,
+    /// Debug-triggered CPURST
+    CpurstDebugTriggered,
+    /// Software-triggered CPURST
+    CpurstSwTriggered,
+}
+
+/// Read the reset cause from the SYSCTL.RSTCAUSE register.
+///
+/// This function reads the reset cause register which indicates why the last
+/// system reset occurred. The register is automatically cleared after being read,
+/// so this should be called only once per application startup.
+///
+/// If the reset cause is not recognized, an `Err` containing the raw value is returned.
+#[must_use = "Reading reset cause will clear it"]
+pub fn read_reset_cause() -> Result<ResetCause, u8> {
+    let cause_raw = pac::SYSCTL.rstcause().read().id();
+
+    use ResetCause::*;
+    use pac::sysctl::vals::Id;
+
+    match cause_raw {
+        Id::NORST => Ok(NoReset),
+        Id::PORHWFAIL => Ok(PorHwFailure),
+        Id::POREXNRST => Ok(PorExternalNrst),
+        Id::PORSW => Ok(PorSwTriggered),
+        Id::BORSUPPLY => Ok(BorSupplyFailure),
+        Id::BORWAKESHUTDN => Ok(BorWakeFromShutdown),
+        Id::BOOTNONPMUPARITY => Ok(BootrstNonPmuParityFault),
+        Id::BOOTCLKFAIL => Ok(BootrstClockFault),
+        Id::BOOTSW => Ok(BootrstSwTriggered),
+        Id::BOOTEXNRST => Ok(BootrstExternalNrst),
+        Id::BOOTWWDT0 => Ok(BootrstWwdt0Violation),
+        Id::SYSBSLEXIT => Ok(SysrstBslExit),
+        Id::SYSBSLENTRY => Ok(SysrstBslEntry),
+        #[cfg(any(mspm0g110x, mspm0g150x, mspm0g151x, mspm0g310x, mspm0g350x, mspm0g351x))]
+        Id::SYSWWDT1 => Ok(SysrstWwdt1Violation),
+        Id::SYSFLASHECC => Ok(SysrstFlashEccError),
+        Id::SYSCPULOCK => Ok(SysrstCpuLockupViolation),
+        Id::SYSDBG => Ok(SysrstDebugTriggered),
+        Id::SYSSW => Ok(SysrstSwTriggered),
+        Id::CPUDBG => Ok(CpurstDebugTriggered),
+        Id::CPUSW => Ok(CpurstSwTriggered),
+        other => Err(other as u8),
+    }
+}