Implement the I2C watchdog using PIT.

right/src/i2c_watchdog.c

@@ -0,0 +1,41 @@
+#include "fsl_pit.h"
+#include "fsl_i2c.h"
+#include "fsl_clock.h"
+#include "i2c.h"
+#include "i2c_watchdog.h"
+#include "bridge_protocol_scheduler.h"
+
+#define PIT_I2C_WATCHDOG_HANDLER PIT0_IRQHandler
+#define PIT_I2C_WATCHDOG_IRQ_ID PIT0_IRQn
+#define PIT_SOURCE_CLOCK CLOCK_GetFreq(kCLOCK_BusClk)
+
+static uint32_t prevWatchdogCounter = 0;
+
+/* This function is designed to restart and reinstall the I2C handler
+ * when a disconnection of the left side makes the master I2C bus unresponsive  */
+void PIT_I2C_WATCHDOG_HANDLER(void)
+{
+    if (I2C_Watchdog == prevWatchdogCounter) { // Restart I2C if there hasn't be any interrupt during 1 sec
+        i2c_master_config_t masterConfig;
+        I2C_MasterGetDefaultConfig(&masterConfig);
+        I2C_MasterDeinit(I2C_MAIN_BUS_BASEADDR);
+        uint32_t sourceClock = CLOCK_GetFreq(I2C_MASTER_BUS_CLK_SRC);
+        I2C_MasterInit(I2C_MAIN_BUS_BASEADDR, &masterConfig, sourceClock);
+        InitBridgeProtocolScheduler();
+    }
+
+    prevWatchdogCounter = I2C_Watchdog;
+
+    PIT_ClearStatusFlags(PIT, kPIT_Chnl_0, PIT_TFLG_TIF_MASK);
+}
+
+void InitI2cWatchdog()
+{
+    pit_config_t pitConfig;
+    PIT_GetDefaultConfig(&pitConfig);
+    PIT_Init(PIT, &pitConfig);
+    PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, USEC_TO_COUNT(1000000U, PIT_SOURCE_CLOCK));
+    PIT_EnableInterrupts(PIT, kPIT_Chnl_0, kPIT_TimerInterruptEnable);
+    EnableIRQ(PIT_I2C_WATCHDOG_IRQ_ID);
+    PIT_StartTimer(PIT, kPIT_Chnl_0);
+}