RP2040: add watchdog patch

Author: facchinm

Diff for: patches/0079-Save-watchdog-timeout-in-a-static-variable-accessibl.patch

@@ -0,0 +1,42 @@
+From 0d1e7e451736c26fa22f459914fa0e09f0949f38 Mon Sep 17 00:00:00 2001
+From: giulcioffi <[email protected]>
+Date: Fri, 4 Jun 2021 14:45:38 +0200
+Subject: [PATCH] Save watchdog timeout in a static variable accessible from
+ Arduino APIs
+
+---
+ targets/TARGET_RASPBERRYPI/TARGET_RP2040/watchdog_api.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/targets/TARGET_RASPBERRYPI/TARGET_RP2040/watchdog_api.c b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/watchdog_api.c
+index b7abac8917..9263eb48d5 100644
+--- a/targets/TARGET_RASPBERRYPI/TARGET_RP2040/watchdog_api.c
++++ b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/watchdog_api.c
+@@ -4,8 +4,11 @@
+ 
+ #if DEVICE_WATCHDOG
+ 
++static watchdog_config_t watchdogConfig;
++
+ watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
+ {
++    watchdogConfig = *config;
+     // The pico watchdogs accept a maximum value of 0x7fffff
+     if ( config->timeout_ms < 0x1 && config->timeout_ms > 0x7FFFFF ) {
+         return WATCHDOG_STATUS_INVALID_ARGUMENT;
+@@ -29,7 +32,11 @@ watchdog_status_t hal_watchdog_stop(void)
+ 
+ uint32_t hal_watchdog_get_reload_value(void)
+ {
+-    return (watchdog_hw->load / 2000U);
++    uint32_t load_value = watchdogConfig.timeout_ms * 1000 * 2;
++    if (load_value > 0xffffffu) {
++        load_value = 0xffffffu;
++    }
++    return load_value;
+ }
+ 
+ watchdog_features_t hal_watchdog_get_platform_features(void)
+-- 
+2.32.0
+