Hello,
My platform is a dra7xx_evm. My code baseline is denx master
I am trying to write to the pcf8575 i2c gpio expander at address 0x21 (bit P4)
I can read 16-bit okay in this version, but 16-bit writing is not working.
// Display current values i2c md 21 0.0 2 0000: f7 eb ..
// Set bit P4 to 1 i2c mw 21 0.0 0xffeb 2
// But it remains at 0xf7 i2c md 21 0.0 2 0000: f7 eb ..
When we put scopes on the i2c lines, it seems that the i2c mw transaction produces a longer i2c bus sequence that does not map to the [Start:Addr:W:A:P7-P0:A:P17-P10:A:Stop] that the pcf8575 device expects.
Either I am invoking "i2c mw" incorrectly, or the oma24xx_i2c driver is not handling i2c 16-bit writes correctly yet.
Any hints will be appreciated. Thanks for everyone's time
-- Richard Retanubun