diff options
| author | Ye Li <ye.li@nxp.com> | 2018-07-08 11:46:42 +0800 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2018-07-12 11:09:23 +0200 |
| commit | d144f61ad3faa2104676791af58c2371729bef94 (patch) | |
| tree | 63ed8747b1cad9a8c94365bb3691d1114e675668 /include/zfs | |
| parent | a32effd2838a62a5d1dcc01f613508f1d90b5667 (diff) | |
lpi2c: Fix bus stop problem in xfer
In xfer function, both bus_i2c_read and bus_i2c_write will
send a STOP command. This causes a problem when reading register
data from i2c device.
Generally two operations comprise the register data reading:
1. Write the register address to i2c device.
START | chip_addr | W | ACK | register_addr | ACK |
2. Read the Data from i2c device.
START | chip_addr | R | ACK | DATA | NACK | STOP
The STOP command should happen at the end of the transfer, otherwise
we will always get data from register address 0
Signed-off-by: Ye Li <ye.li@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'include/zfs')
0 files changed, 0 insertions, 0 deletions