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I2C: add wait time after write to let EEPROM write

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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
This commit is contained in:
Kévin Redon
2018-07-24 09:49:11 +02:00
parent b60538888f
commit 57b60d23cf
1 changed files with 2 additions and 0 deletions
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2
firmware/libboard/qmod/source/i2c.c
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@@ -185,6 +185,8 @@ int eeprom_write_byte(uint8_t slave, uint8_t addr, uint8_t byte)
nack = i2c_write_byte(false, true, byte); nack = i2c_write_byte(false, true, byte);
if (nack) if (nack)
goto out_stop; goto out_stop;
/* Wait tWR time to ensure EEPROM is writing correctly (tWR = 5 ms for AT24C02) */
mdelay(5);
out_stop: out_stop:
i2c_stop_cond(); i2c_stop_cond();