From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] i2c driver for arm926ejs - at91sam9m10g45
Date: Fri, 20 Apr 2012 11:48:10 +0200 [thread overview]
Message-ID: <201204201148.10576.marex@denx.de> (raw)
In-Reply-To: <CALe7QMDvLtsrSZ5wBYV5y++sVBy1MW=QRh=QAGry+pBNgDJT+w@mail.gmail.com>
Dear Wilson Perez,
> I'm interested in the i2c driver for the arm926ejs cpu and at91sam9m10g45
> board. I'm dealing with the issue that when enabling CONFIG_SOFT_I2C it
> needs proper definitions for I2C_INIT, I2C_SDA, I2C_READ, etc. and when
> enabling CONFIG_HARD_I2C the build fails with undefined references:
> i2c_init, i2c_read, i2c_write, i2c_probe.
>
> Can someone please point me in the right direction?
Well of course, you need to implement that API (i2c_read/write/probe/init()
calls) if you want hardware-assisted I2c, check your CPU datasheet.
If you implement only soft-spi, you need to implement I2C_SDA etc functions,
which flip the GPIO lines that emulate the SPI.
>
> Thanks.
>
> Wilson
Best regards,
Marek Vasut
prev parent reply other threads:[~2012-04-20 9:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 15:08 [U-Boot] i2c driver for arm926ejs - at91sam9m10g45 Wilson Perez
2012-04-20 9:48 ` Marek Vasut [this message]
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