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Hallo
Im using the LPC2478 with 8 MB external memory. Im setting up the SDRAM from within the LPC2400.s file.
Everything is OK, until a NORMAL command is issued to the SDRAM (Right after dummy read)
LDR R4, =NORMAL_CMD ; Write NORMAL Command STR R4, [R0, #EMC_DYN_CTRL_OFS]
The last code line, overwrittes the EMCDynamicCfg0 register with a value resulting in selection of a wrong SDRAM type. Before the call the EMCDynamicConfig0 is 0x00001280 After the line its 0x07664448 ???
The values in R4, R0 and #EMC_DYN_CTRL_OFS are just fine.
Why does that code write to my EMCDynamicConfig0 register? It schould write to the EMCDynamicControl register instead. But it writes to both with a corrupted value?
/Thomas
I know. So I have just used a timer for the job instead. So any delays can be made by calling the same function