topic Re: LPC55S69: Flash driver init ,12Mhz vs 96 Mhz in LPC Microcontrollers

LPC55S69: Flash driver init ,12Mhz vs 96 Mhz

EugeneHiihtaja — Wed, 08 Jan 2020 17:52:55 GMT

Hi !

Flash driver initialization require clock as part of init structure ( see fsl_iap.c )

status_t FLASH_Init(flash_config_t *config)
{
assert(VERSION1_FLASH_API_TREE);
config->modeConfig.sysFreqInMHz = (uint32_t)kSysToFlashFreq_defaultInMHz; // 96 Mhz
versionMajor = BOOTLOADER_API_TREE_POINTER->bootloader_version.major;
return VERSION0_FLASH_API_TREE->flash_init(config);
}

I have SystemClock 12 Mhz or 96 Mhz .

Should I reinit Flash driver all the time when SystemClock is changes ?

I mean before Erase/Program/Verify execution ?

Or 96Mhz values can be used at 12Mhz as well without problems ?

Regards,

Eugene

Re: LPC55S69: Flash driver init ,12Mhz vs 96 Mhz

ZhangJennie — Thu, 09 Jan 2020 09:30:43 GMT

Eugene Hiihtaja

Normally,

when SystemClock is initialized as 96MHZ and changes to 12Hhz, no need to re-initialize flash.

if SystemClock is initialized as 12MHZ and changes to 96Hhz, you need re-initialize flash.

Have a great day,
Jun Zhang

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