TS-4900 TWI: Difference between revisions
From embeddedTS Manuals
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The i.MX6 supports standard I2C at 100khz, or using fast mode for 400khz operation. The CPU has 2 I2C | The i.MX6 supports standard I2C at 100khz, or using fast mode for 400khz operation. The CPU has 2 I2C buses used on the TS-4900. | ||
I2C 1 is internal to the TS-4900 and connects to the RTC and FPGA. | I2C 1 is internal to the TS-4900 and connects to the RTC and FPGA. | ||
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The second I2C bus is brought out on CN2_28 (SCL) and CN2_30 (SDA). This bus has no devices except those added by the baseboard. | The second I2C bus is brought out on CN2_28 (SCL) and CN2_30 (SDA). This bus has no devices except those added by the baseboard. | ||
{{Note|It is also possible to request the kernel to bitbang additional I2C | {{Note|It is also possible to request the kernel to bitbang additional I2C buses as needed. See an example [https://github.com/embeddedTS/linux-3.10.17-imx6/blob/619e6bf97479243e9d7b7f6b34ce0ae8558ff1fd/arch/arm/boot/dts/imx6qdl-ts4900-2.dtsi#L196 here].}} | ||
The kernel makes the I2C available at /dev/i2c-#. You can use the i2c-tools (i2cdetect, | The kernel makes the I2C available at /dev/i2c-#. You can use the i2c-tools (i2cdetect, i2cget, i2cset), or you can [https://github.com/embeddedTS/linux-3.10.17-imx6/blob/619e6bf97479243e9d7b7f6b34ce0ae8558ff1fd/Documentation/i2c/dev-interface write your own client]. | ||
Latest revision as of 16:58, 17 January 2022
The i.MX6 supports standard I2C at 100khz, or using fast mode for 400khz operation. The CPU has 2 I2C buses used on the TS-4900.
I2C 1 is internal to the TS-4900 and connects to the RTC and FPGA.
| Address | Device |
|---|---|
| 0x28-0x2f | #FPGA |
| 0x57 | #NVRAM |
| 0x6f | #RTC |
The second I2C bus is brought out on CN2_28 (SCL) and CN2_30 (SDA). This bus has no devices except those added by the baseboard.
| Note: | It is also possible to request the kernel to bitbang additional I2C buses as needed. See an example here. |
The kernel makes the I2C available at /dev/i2c-#. You can use the i2c-tools (i2cdetect, i2cget, i2cset), or you can write your own client.