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