The AT32UC3A0512ES chip has a bug when disabling interrupts. As a workaround, two NOPs can be inserted.
Signed-off-by: Gunnar Rangoy gunnar@rangoy.com Signed-off-by: Paul Driveklepp pauldriveklepp@gmail.com Signed-off-by: Olav Morken olavmrk@gmail.com --- lib_avr32/interrupts.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/lib_avr32/interrupts.c b/lib_avr32/interrupts.c index 28df20d..bbbc490 100644 --- a/lib_avr32/interrupts.c +++ b/lib_avr32/interrupts.c @@ -35,5 +35,12 @@ int disable_interrupts(void) sr = sysreg_read(SR); asm volatile("ssrf %0" : : "n"(SYSREG_GM_OFFSET));
+#ifdef CONFIG_AT32UC3A0xxx + /* Two NOPs are required after masking interrupts on the + * AT32UC3A0512ES. See errata 41.4.5.5. */ + asm("nop"); + asm("nop"); +#endif + return !SYSREG_BFEXT(GM, sr); }