Content originally posted in LPCWare by Alex on Fri Jan 25 02:42:11 MST 2013
Hi,
I started software development for the LPC4337 a few days ago. Currently I'm trying to write a driver for the internal EEPROM.
Unfortunately I'm not able to store data in the EEPROM.
Hopefully one of you can help.
Here is the code I've written:
<code>
//class constructor setting wait states and clock divider. The CPU runs at 200 MHz (MCK = 200000000)
CEEPAccess::CEEPAccess(void)
{
EE_CLKDIV = (MCK / 1500000) - 1; //set clock divider as required for EEPROM usage
EE_INTENCLR = (1 << 2); //clear interrupt enable bit
EE_AUTOPROG = 0;
EE_PWRDWN = 0;
EE_RWSTATE = (7 << 8) | 14; //8 waitstates in RPHASE 1 and 15 waitstates in RPHASE 2
EE_WSTATE = (4 << 16) | (8 << 8) | 2; //5 waitstates in Phase 1, 9 waitstates in Phase 2 and 3 waitstates in Phase 3
}
//adr -> pointer to destination, data -> pointer to source, len -> number of bytes to copy
__ramfunc MEM_ERR CEEPAccess::WriteMemory(unsigned char* adr, unsigned int len, unsigned char* data)
{
if((reinterpret_cast<int>(adr) < EEP_START_ADDRESS) || ((reinterpret_cast<int>(adr) + len) >= (EEP_START_ADDRESS + EEP_SIZE_BYTES)))
return MEM_ERR_ADDRESS_ERR;
do
{
*adr++ = *data++; //copy from source buffer to destination in EEPROM
--len;
//if all bytes copied or reached a page boundary start programming the current page
if((len == 0) || ((reinterpret_cast<int>(adr) & (EEP_PAGE_SIZE_BYTES - 1)) == 0))
{
EE_CMD = EEPROM_CMD_WRITE; //write programming command to EEPROM command register
unsigned int Time = SystemTimer::GetSystemTime();
//wait until programming done or timeout
while((!EE_INTSTAT_bit.END_OF_PROG) && ((SystemTimer::GetSystemTime() - Time) < 100));
if(!EE_INTSTAT_bit.END_OF_PROG) //if programming is not finished return error
return MEM_ERR_ACCESS_DENIED;
EE_INTSTATCLR = EE_INTSTATCLR_PROG_CLR_ST; //clear program done interrupt flag
}
}while(len > 0);
return MEM_ERR_NO_ERR;
}
</code>
