I use the FRDM-K82F board and try to write to the external NOR-flash via QSPI interface. For the first test I used the driver demo "qspi_polling_transfer". This works fine if I do not modify it, but if I put in code that reads out flash memory via AHB before writeing to it, reprogramming the flash memory does not work anymore. I have no clue why?
Here is the code example:
void qspi_polling(void)
{
uint32_t i = 0;
uint32_t err = 0;
//####### if this code is inserted, erase and program_page does not work #######
for (i = 0; i < 64; i++)
{
PRINTF("The flash value in %d is %x\r\n", i, ((uint32_t *)(FSL_FEATURE_QSPI_AMBA_BASE))[i]);
}
//##############################################################################
erase_sector(FSL_FEATURE_QSPI_AMBA_BASE);
PRINTF("Erase finished!\r\n");
/* Program a page */
program_page(FSL_FEATURE_QSPI_AMBA_BASE, buff);
PRINTF("Program data finished!\r\n");
for (i = 0; i < 64; i++)
{
if (((uint32_t *)(FSL_FEATURE_QSPI_AMBA_BASE))[i] != buff[i])
{
PRINTF("The data in %d is wrong!!\r\n", i);
PRINTF("The flash value in %d is %d\r\n", i, ((uint32_t *)(FSL_FEATURE_QSPI_AMBA_BASE))[i]);
err++;
} else {
PRINTF("The flash value ok in %d is %x\r\n", i, ((uint32_t *)(FSL_FEATURE_QSPI_AMBA_BASE))[i]);
}
}
if (err == 0)
{
PRINTF("Program through QSPI polling succeed!\r\n");
}
}
