> -----Original Message-----
> From: avr-libc-dev-bounces+pitchumani.s=atmel....@nongnu.org [mailto:avr-
> libc-dev-bounces+pitchumani.s=atmel....@nongnu.org] On Behalf Of Scott Price
> Sent: 10 February 2016 00:54
> To: avr-libc-dev@nongnu.org
> Subject: [avr-libc-dev] 2.0.0 and XMega32E5 eeprom troubles...
>
>
> I am not able to get any of the eeprom_write_* or eeprom_update_* functions
> working on an XMega32E5. There are no compile errors or warnings, the
> functions just don't do anything. The eeprom read functions that I am using
> all work fine.
>
> I had previously been using a version of avr-libc that I lifted from
> AVRStudio 6.2 to get support for the E5. The eeprom functions worked well
> on that version.
>
> I compiled it using gcc-4.9.3 on Ubuntu Trusty.
>
> Atmel's nvm functions work for me, but add a significant amount of code.
> I would rather use the ones from avr-libc, since I use them for all of my
> other AVR projects.
>
> Looking through the code and the docs it seems like the functions should
> work.
>
> I have done a number of experiments, including writing a fixed value to a
> fixed location on boot then reading the eeprom out with avr-dude.
> Nothing I have done has produced a successful write.
>
> What more information do you need, or what tests can I run to help debug
> this?
Hi Scott,
If you are building avr-libc, could you try below patch?
This is the related difference I could see from Atmel's avr-libc build.
Regards,
Pitchumani
diff --git a/avr-libc/libc/misc/eewr_byte.S b/avr-libc/libc/misc/eewr_byte.S
index 98008c2..30b1595 100644
--- a/avr-libc/libc/misc/eewr_byte.S
+++ b/avr-libc/libc/misc/eewr_byte.S
@@ -61,6 +61,12 @@ ENTRY eeprom_write_r18
# define NVM_CMD_ERASE_EEPROM_BUFFER_gc 0x36
# endif
+#if ! defined (NVM_EEMAPEN_bm)
+ ; Saving X register because it might contain source address of block
+ push XL
+ push XH
+#endif
+
; Prepare base address of NVM.
ldi ZL, lo8(NVM_BASE)
ldi ZH, hi8(NVM_BASE)
@@ -136,6 +142,12 @@ ENTRY eeprom_write_r18
; Increment address.
adiw addr_lo, 1
+#if ! defined (NVM_EEMAPEN_bm)
+ ; Restoring X register
+ pop XH
+ pop XL
+#endif
+
ret
#else /* ---------------------------------------------------- */
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