TLF35584 TC234 WWD application - device not going into normal mode

[Fernandes]

I swear you guys at infineon have made life unnecessarily difficult. Why can't I find a single working example with the TLF?

I am following the AP32342 app note on the tc234 application kit v1.0

I have spi comms up and running and the TLF communicating with the tc234. I need to be able to refresh the WWD (not interested in FWD) periodically. Following is the code I have used to set this up :

// Send unlock sequence 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_UNLOCK1), &spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_UNLOCK2), &spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_UNLOCK3), &spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_UNLOCK4), &spiMasterRxBuffer);

   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_SYSPCFG0, 0x01U), &spiMasterRxBuffer); // Default value 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_SYSPCFG1, 0x08U), &spiMasterRxBuffer); // [3] ERREN=1 (Enable ERR input monitor) 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_WDCFG0,   0x9AU), &spiMasterRxBuffer); // [3] WWDEN=1,[2] FWDEN=0, [1] WWDTSEL=1 (aka SPI), [0] WDCYC=0 (aka WDCYC=0.1ms) 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_WWDCFG0,  0x00U), &spiMasterRxBuffer); // Close window CW = (0+1)*50*0.1ms = 5ms 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_WWDCFG1,  0x01U), &spiMasterRxBuffer); // Open window OW = (1+1)*50*0.1ms = 10ms 

   // Send lock sequence 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_LOCK1), &spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_LOCK2), &spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_LOCK3), &spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_PROTCFG,TLF_LOCK4), &spiMasterRxBuffer);
   
   TIMEOUT_USEC_Start(60U);
   
   // Refresh watchdog first call
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_WWDSCMD, 0x00U),&spiMasterRxBuffer); 

   // Go to normal state
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_INITERR, 0xFFU),&spiMasterRxBuffer); // 21. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_OTFAIL,  0xFFU),&spiMasterRxBuffer); // 22. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_OTWRNSF, 0xFFU),&spiMasterRxBuffer); // 23. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_MONSF0,  0xFFU),&spiMasterRxBuffer); // 24. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_MONSF1,  0xFFU),&spiMasterRxBuffer); // 25. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_MONSF2,  0xFFU),&spiMasterRxBuffer); // 26. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_MONSF3,  0xFFU),&spiMasterRxBuffer); // 27. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_SPISF,   0xFFU),&spiMasterRxBuffer); // 28. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_WKSF,    0xFFU),&spiMasterRxBuffer); // 29. Clear any error 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_DEVCTRL, 0xFAU),&spiMasterRxBuffer); // 30. Go to NORMAL and wait the State transition time ttr = 100us 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_DEVCTRLN,0x05U),&spiMasterRxBuffer); // 31. Inverted Go to NORMAL and wait the State transition time ttr = 100us 

   // Wait for recommended 100us for registers to set
   TIMEOUT_USEC_Start(100U);

   // Second service call 
   TLF_SPI_Exchange(TLF_ENCODE_TX_WRITE(TLF_ADDR_WWDSCMD, 0x01U),&spiMasterRxBuffer); 
   
   // registers to set
   TIMEOUT_USEC_Start(100U);

   // Here, Read back above protected registers and confirm if configured accurately FIXME
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_SYSFAIL  , 0x00U), &spiMasterRxBuffer);  // Read status
   stat_SYSFAIL   = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_IF       , 0x00U), &spiMasterRxBuffer);  // Read status
   stat_IF        = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_SYSSF    , 0x00U), &spiMasterRxBuffer);  // Read status
   stat_SYSSF     = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_WWDSTAT ,  0x00U), &spiMasterRxBuffer);  // Read status
   stat_WWDSTAT   = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);

   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_RSYSPCFG0, 0x00U), &spiMasterRxBuffer);  // Read status
   stat_RSYSPCFG0 = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_RSYSPCFG1, 0x00U), &spiMasterRxBuffer);  // Read status
   stat_RSYSPCFG1 = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_RWDCFG0,   0x00U), &spiMasterRxBuffer);  // Read status
   stat_RWDCFG0   = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_RWWDCFG0,  0x00U), &spiMasterRxBuffer);  // Read status
   stat_RWWDCFG0  = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_RWWDCFG1,  0x00U), &spiMasterRxBuffer);  // Read status
   stat_RWWDCFG1  = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);
   TLF_SPI_Exchange(TLF_ENCODE_TX_READ(TLF_ADDR_DEVSTAT ,  0x00U), &spiMasterRxBuffer);  // Read status
   stat_DEVSTAT   = (uint8_t) TLF_DECODE_RX(spiMasterRxBuffer);

The TLF refuses to go into NORMAL mode. The status errors I get are as follows:

DEVSTAT : 0xF9 (still in init mode)
WWDSTAT : 0x03
IF: : 0x01
SYSSF :0x02

The device stays in init mode even if I ask it to go to another mode. Above errors pop up immediately after first watchdog service call

What am I missing?

[Fernandes]

if i disable the "execute commands on rset" option (turning off the workaround for tlf reset), should the board automatically reset on POR cuz of the tlf and stay in reset loop?

[Fernandes]

Setting TLF_ADDR_SYSPCFG0 to 0 instead of 1 solved the issue. Little information is available in the manual/datasheet as to why