TS-7180 TWI: Difference between revisions
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== | 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-4100. | ||
{{: | |||
I2C 1 is internal to the TS-4100 and connects to the onboard Silabs supervisory microcontroller at 100khz; and to the onboard [http://www.st.com/content/st_com/en/products/clocks-and-timers/real-time-clock-rtc-ics/rtc-serial-interface/m41t00s.html MT41T00S] real-time clock (RTC). | |||
{| class=wikitable | |||
|+ /dev/i2c-0 | |||
|- | |||
! Address | |||
! Device | |||
|- | |||
| 0x10 | |||
| [[#Silabs]] | |||
|- | |||
| 0x68 | |||
| [[#TS7180_RTC | #RTC]] | |||
|} | |||
The second I2C bus is connected to the onboard FPGA. This bus also runs at 400khz by default. | |||
{| class=wikitable | |||
|+ /dev/i2c-2 | |||
|- | |||
! Address | |||
! Device | |||
|- | |||
| 0x28-0x2f | |||
| [[#FPGA]] | |||
|} | |||
{{Note|It is also possible to request the kernel to bitbang additional I2C buses as needed. See an example [https://github.com/embeddedarm/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, i2cget, i2cset), or you can [https://github.com/embeddedarm/linux-3.10.17-imx6/blob/619e6bf97479243e9d7b7f6b34ce0ae8558ff1fd/Documentation/i2c/dev-interface write your own client]. | |||
Revision as of 13:10, 3 March 2017
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-4100.
I2C 1 is internal to the TS-4100 and connects to the onboard Silabs supervisory microcontroller at 100khz; and to the onboard MT41T00S real-time clock (RTC).
| Address | Device |
|---|---|
| 0x10 | #Silabs |
| 0x68 | #RTC |
The second I2C bus is connected to the onboard FPGA. This bus also runs at 400khz by default.
| Address | Device |
|---|---|
| 0x28-0x2f | #FPGA |
| 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.