(mynewt-core) branch master updated: hw/mcu: Improve watchdog handling on LPC55xx

[jerzy]

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jerzy pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/mynewt-core.git


The following commit(s) were added to refs/heads/master by this push:
     new ca6ba0ebb hw/mcu: Improve watchdog handling on LPC55xx
ca6ba0ebb is described below

commit ca6ba0ebb1def03dd019303851d96970b426883f
Author: Wiktor Kwiatkowski <wiktorkwiatkowski...@gmail.com>
AuthorDate: Mon Aug 11 10:45:44 2025 +0200

    hw/mcu: Improve watchdog handling on LPC55xx
    
    Added watchdog reset on timeout instead of interrupt as before.
    Implemented proper conversion from milliseconds to watchdog
    register value (fixed incorrect *1000 scaling).
    Added static assertion to ensure watchdog interval does not
    exceed hardware limits.
---
 hw/mcu/nxp/lpc55xx/src/hal_watchdog.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/hw/mcu/nxp/lpc55xx/src/hal_watchdog.c 
b/hw/mcu/nxp/lpc55xx/src/hal_watchdog.c
index 3e4b77509..baa78a9af 100644
--- a/hw/mcu/nxp/lpc55xx/src/hal_watchdog.c
+++ b/hw/mcu/nxp/lpc55xx/src/hal_watchdog.c
@@ -21,10 +21,13 @@
 
 #include <fsl_wwdt.h>
 
-#ifndef WATCHDOG_STUB
+#if MYNEWT_VAL(WATCHDOG_INTERVAL) > 0
+_Static_assert(((1ULL << 24) * 4 * 1000) / 1000000 >= 
MYNEWT_VAL(WATCHDOG_INTERVAL),
+               "Watchdog interval out of range, decrease value 
WATCHDOG_INTERVAL in syscfg.yml");
 #endif
 
-int hal_watchdog_init(uint32_t expire_msecs)
+int
+hal_watchdog_init(uint32_t expire_msecs)
 {
 #ifndef WATCHDOG_STUB
     wwdt_config_t config;
@@ -34,21 +37,26 @@ int hal_watchdog_init(uint32_t expire_msecs)
 
     WWDT_GetDefaultConfig(&config);
     config.clockFreq_Hz = 1000000;
-    config.timeoutValue = expire_msecs * 1000;
+    config.enableWatchdogReset = true;
+    /* Convert timeout from milliseconds to watchdog timer ticks
+     * (1 tick = 4 us due to fixed prescaler of 4) */
+    config.timeoutValue = expire_msecs * 250;
     WWDT_Init(WWDT, &config);
 #endif
 
     return 0;
 }
 
-void hal_watchdog_enable(void)
+void
+hal_watchdog_enable(void)
 {
 #ifndef WATCHDOG_STUB
     WWDT_Enable(WWDT);
 #endif
 }
 
-void hal_watchdog_tickle(void)
+void
+hal_watchdog_tickle(void)
 {
 #ifndef WATCHDOG_STUB
     WWDT_Refresh(WWDT);