topic Re: LPC5410x SCT0 crashes mcu in LPC Microcontrollers

LPC5410x SCT0 crashes mcu

svensavic — Sun, 07 Jul 2019 21:21:47 GMT

I am trying to get SCT0 working, but my mcu keeps crashing into hardfault handler. This would normally indicate trying to write to the wrong memory address (in this case anyway). So, looking at the memory address for SCT0 in memory mapping table it is stated that SCT0 is starting at 0x1C018000, which seems to be aligning with this part of my code:

LPC_SCT0->CONFIG |= _BV(0) | (1<<17); //set 32bit timer, autolimit on mat0
LPC_SCT0->EVENT[0].STATE = 1;

This part seems to be Ok, from what I can observe in the debugger under SCT registers. It seems that config does change value and event is set.

Nothing else was configured between that call and next one that crashes my mcu:

LPC_SCT0->MATCH[1].U = 10;
LPC_SCT0->MATCHREL[1].U = 10;
LPC_SCT0->EVENT[1].STATE = 1;

I verified the address of MATCH[1].U (32 bit entry) with command: (uint32_t *)&LPC_SCT0->MATCH[1].U

and I am getting value of: 0x1c018104

104 from the address I have configured for MATCH[1] does align with the offset in the user manual.

What could cause MCU to crash by assigning value to the valid memory address ?

Re: LPC5410x SCT0 crashes mcu

jeremyzhou — Mon, 08 Jul 2019 07:19:37 GMT

Hi Sven Savic,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
According to the RM, Match registers can be read at any time. Writing to the MATCH_L, MATCH_H, or unified register is only allowed when the corresponding counter is halted (HALT bits are set to 1 in
the CTRL register). So please assure the HALT bit is 1 when writing the Match register.

Have a great day,
TIC

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Re: LPC5410x SCT0 crashes mcu

svensavic — Tue, 09 Jul 2019 09:38:27 GMT

That was it. thanks