Hi
I am working on a host application, which will program a LPC84x MCU via ISP by the I2C interface.
From the user manual I can read that the FAIM register default value is ISP over UART.
So, how do I access the FAIM registers, to change it to use ISP over I2C?
Isn't it possible to program the LPC84x by ISP/I2C without having to access the MCU registers first?
Thanks
Kaare
Hi Victor
Thanks for the fast response
But I don't like your answer
The example you point me to, shows how to change the FAIM from the LPC845 MCU itself.
This means that I have to have firmware in the MCU.
But, I don't want hat.
The reason to boot the LPC845 from a remote host via ISP, is to be able to boot the LPC845 directly from the factory.
I don't want to first program a dummy firmware into the chip, just to change the FAIM register setting.
As I read it, I have to use the UART to change the FAIM. This must be done in the factory, then.
And then I have to have the UART RX/TX exposed somehow.
And I must implement this in our production test facilities (which I hoped was not necessary...)
This was definitely not what I had in mind, and will complicate things a lot.
br
Kaare
Hi
I have now tried out the FAIM example for the LPC845.
It is fairly simple, but i can't figure out how it works (and it does not work):
I use Rowley Crossworks, but I simple copied the necessary source to my main.c, to try it out:
When i call FAIMRead like this:
FAIMRead( 0, (uint32_t)&read_data);
...it returns OK, but "read_data" is never updated by the call to FAIMRead.
Do I do anything wrong, or have I misunderstood something?
Here is the source I copied from the FAIM and clocks example:
struct sIAP
{
uint32_t cmd; // Command
uint32_t par[4]; // Parameters
uint32_t stat; // Status
uint32_t res[4]; // Result
};
static struct sIAP IAP;
// Pointer to ROM IAP entry functions
#define IAP_ENTRY_LOCATION 0x0F001FF1
enum eIAP_COMMANDS
{
IAP_PREPARE = 50, // Prepare sector(s) for write operation
IAP_COPY_RAM2FLASH, // Copy RAM to Flash
IAP_ERASE, // Erase sector(s)
IAP_BLANK_CHECK, // Blank check sector(s)
IAP_READ_PART_ID, // Read chip part ID
IAP_READ_BOOT_VER, // Read chip boot code version
IAP_COMPARE, // Compare memory areas
IAP_REINVOKE_ISP, // Reinvoke ISP
IAP_READ_UID, // Read unique ID
IAP_ERASE_PAGE, // Erase page(s)
IAP_READ_MISR=70,
IAP_READ_MISR_EX=73,
IAP_READ_PAGE_FAIM=80,
IAP_WRITE_PAGE_FAIM=81
};
// IAP Call
typedef void (*IAP_Entry) (uint32_t *cmd, uint32_t *stat);
#define IAP_Call ((IAP_Entry) IAP_ENTRY_LOCATION)
int FAIMRead (uint32_t adr0, uint32_t adr1)
{
IAP.cmd = IAP_READ_PAGE_FAIM; // READ FAIM PAGE
IAP.par[0] = adr0; // FAIM page number
IAP.par[1] = adr1; // Destination RAM address to store the read value
IAP_Call (&IAP.cmd, &IAP.stat); // Call IAP Command
if (IAP.stat) return (IAP.stat); // Command Failed
return (0); // Finished without Errors
}
Ah !
It was the compiler optimization that made weird things happen (or not happen).
It works now, thanks !
We have decided to make a testprogram to download at production / test, which changes the FAIM to use I2C port for ISP interface.
It was not what we hoped, but it is doable.
br
Kåre
Hello Kaare,
Regarding your questions please see my comments below.
I recommend you use the example FAIM_and_Clocks of the CodeBundle for the LPC845, to change the value of the bits 31:30 of the FAIM word0. If you are using MCUXpresso IDE you can find the code bundle in the following path: C:\nxp\MCUXpressoIDE_10.2.1_795\ide\Examples\CodeBundles
Unfortunately no, it's not possible to program the LPC84x by I2C without changing the FAIM values first.
Hope it helps!
Victor.
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