I am using the LPC2300 (2378) board.
I need to permanently store a variety of settings so that they are available from startup to startup. These are stored in a struct. I have done the following for storing them:
// prep sector 9 (0x00010000) for writing command[0] = 50; // IAP Prepare Sectors for Write operation command[1] = 9; // Controller variables stored in sector 9 command[2] = 9; // (end sector is same - only use 1 sector) iap_entry=(IAP) IAP_LOCATION; // copy ram to flash command[0] = 51; // IAP Copy Ram to flash operation command[1] = 0x00010000; // address of sector 9 command[2] = (unsigned long)&parms; // parms location command[3] = sizeof(parms); command[4] = 12000; // clock speed iap_entry=(IAP) IAP_LOCATION;
I am accessing the data with a simple memcpy
memcpy( (void *)&gParms, (void *)0x00010000, sizeof(gParms) );
When I do a write and then do the memcpy the data isn't being stored/retrieved correctly.
What am I missing/ doing wrong?
Any help is greatly appreciated.
Thanks
Dave
Have you either turned off all interrupts, or moved all ISR code to RAM?
No. I take it I have to?
Do I have to remove the interrupts or can i suspend them with something like this
VICIntEnClr = 1 << IntNumber; /* Disable Interrupt */
Sorry if these seem a little basic. I am new to the whole microController thing and I am a little overwhelmed at this point.
If you look at chapter 27 in the lpc23xx user manual, you will notice paragraph 4.2.7 which says:
The on-chip flash memory is not accessible during erase/write operations. When the user application code starts executing the interrupt vectors from the user flash area are active. The user should either disable interrupts, or ensure that user interrupt vectors are active in RAM and that the interrupt handlers reside in RAM, before making a flash erase/write IAP call. The IAP code does not use or disable interrupts.
I recommend that you read through all of chapter 27.
OK I have read it - that's how I have gotten this far.
I need to disable the interrupts or move the code to RAM. Since I can't find anything yet on how to move the code to RAM I am trying to go with the disabling. The only thing I can find for disabling the interrupts is VICIntEnClr. My understanding of this is that if I do the following I should disable the irqs
unsigned long irqStatus; irqStatus = VICIntEnable; VICIntEnClr = irqStatus; // disable the active irqs // write data as I did above VICIntEnable = irqMask; /* reEnable Interrupt */
Am I hopelessly lost?