Hi all,
I am trying to save a single instance of a typedeffed data type to the flash of the XMC4400 for later use (only an example here, in reality it is a larger configuration struct, but not larger than the page size of 256 bytes). As a target, I chose the first page of the user configurable block 0 (UCB0) of the flash of XMC4400, starting address is 0xc000000.
Here is a portion of sample code that I tried - loading the data is not a problem as the flash can be accessed as RAM, but saving the data does not work - though I'm using the latest version of the XMClib ->
and . The codes executes without exceptions, the flash status indicates programming mode after save_data(..), but if I look at 0xc000000 with the debugger I notice nothing has happened. Consequently, after load_data() the variable reads random data.
Can anyone help? Provide some code that will succeed to write this variable to the flash?
Thanks,
Niklas
#include
#include
#include
#include
#define FLASH_ADDRESS XMC_FLASH_UCB0
typedef struct my_type {
bool foo;
void (*foo_handler)(void);
float bar;
//etc...
}TYPE_t;
TYPE_t data;
void save_data(uint32_t* address)
{
uint32_t page[XMC_FLASH_WORDS_PER_PAGE];
TYPE_t* data_ptr = &data;
//initialize a buffer of the size of one flash page
for (uint32_t i=0; i page=0;
//copy the target data word by word into the buffer
for (uint32_t i=0; i page= *(uint32_t*)data_ptr++;
XMC_FLASH_ClearStatus();
//attempt to write the buffer (=one page) to the flash -> executes but does not do anything???
XMC_FLASH_ProgramPage(FLASH_ADDRESS, page);
}
void load_data(void)
{
data = *((TYPE_t*)FLASH_ADDRESS);
}
int main(void)
{
SystemInit();
data.foo = true;
data.foo_handler = NULL;
data.bar = 100e-9;
save_data(FLASH_ADDRESS);
data.foo = false;
data.bar = 0;
load_data();
while(1U);
}
