Kévin Redon has uploaded this change for review. (
https://gerrit.osmocom.org/10123
Change subject: I2C: add wait time after write to let EEPROM write
......................................................................
I2C: add wait time after write to let EEPROM write
The Atmel AT24C02 defines a maximum tWR waiting time after a byte
write of 5 ms before a next write.
Enforcing this wait time also fixed the failed verification in qmod,
where it was reading 0xffff instead of the written value.
Change-Id: I42c90b8d0329e425f275067e87d584212a43a90b
---
M firmware/libboard/qmod/source/i2c.c
1 file changed, 2 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/simtrace2 refs/changes/23/10123/1
diff --git a/firmware/libboard/qmod/source/i2c.c
b/firmware/libboard/qmod/source/i2c.c
index 06c7565..a708704 100644
--- a/firmware/libboard/qmod/source/i2c.c
+++ b/firmware/libboard/qmod/source/i2c.c
@@ -185,6 +185,8 @@
nack = i2c_write_byte(false, true, byte);
if (nack)
goto out_stop;
+ /* Wait tWR time to ensure EEPROM is writing correctly (tWR = 5 ms for
AT24C02) */
+ mdelay(5);
out_stop:
i2c_stop_cond();
--
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Gerrit-Project: simtrace2
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I42c90b8d0329e425f275067e87d584212a43a90b
Gerrit-Change-Number: 10123
Gerrit-PatchSet: 1
Gerrit-Owner: Kévin Redon <kre...@sysmocom.de>
