LPC5536 flash access in read ==> Bus Fault Error

simongodfrind — Fri, 02 Sep 2022 13:10:35 GMT

Hi, thanks for you time.

I'm working on a LPC5536, I have created a blank project for LPC55

And I have A BusFault when I execute the following code :

static uint32_t debug_test[16];
int main(void)
{
memcpy(debug_test, (void*) 0x24000, sizeof(debug_test));
while(1);

}

I don't know if I execute a more complex code, and add RTT client, I can print data and I have :

segger RTT enabled!
flash initialised
total size: 0x0003dc00
block size: 0x00000000
sector size: 0x00008000
page size: 0x00000200

flash status before the mem-copy :
CMD               00000000
EVENT    00000000
STARTA    00003de0
STOPA            00000000
DATAW[0]        00000000
DATAW[1]        00000000
DATAW[2]    00000000
DATAW[3]    00000000
INTEN_CLR     00000000
INTEN_SET     00000000
INTSTAT          00000004
INTEN              00000000
INTSTAT_CLR 00000000
INTSTAT_SET 00000000
MODULE_ID    c40a2100
INTSTAT decomposition
        LAST COMMAND IS FINISHED

let's try the mem-copy now :
HARD FAULT OCCURED
flash status inside the hard fault :
flash status :
CMD               00000000
EVENT           00000000
STARTA         00003de0
STOPA       00000000
DATAW[0]       00000000
DATAW[1]       00000000
DATAW[2]       00000000
DATAW[3]       00000000
INTEN_CLR 00000000
INTEN_SET    00000000
INTSTAT         0000000c
INTEN         00000000
INTSTAT_CLR 00000000
INTSTAT_SET 00000000
MODULE_ID    c40a2100
INTSTAT decomposition
          LAST COMMAND IS FINISHED
         ECC ERROR

Any idea on what can cause this ? did I enabled any kind of protection ?

Re: LPC5536 flash access in read ==> Bus Fault Error

Alice_Yang — Mon, 05 Sep 2022 07:09:21 GMT

Hello,

This is not valid:

memcpy(debug_test, (void*) 0x24000, sizeof(debug_test));

topic Re: LPC5536 flash access in read ==> Bus Fault Error in LPC Microcontrollers

LPC5536 flash access in read ==> Bus Fault Error

Re: LPC5536 flash access in read ==> Bus Fault Error