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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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en:c_hardware_i2c [2017/01/19 12:58] odroid [Loading I2C driver] |
en:c_hardware_i2c [2017/06/20 13:18] (current) brian.kim [How to change the I2C clock speed] |
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| ====== I2C ====== | ====== I2C ====== | ||
| - | This page introduces how you can interface your I2C devices to **ODROID-C**. | + | This page introduces how you can interface your I2C devices to **ODROID-C** series. |
| ===== H/W connection ===== | ===== H/W connection ===== | ||
| Line 48: | Line 48: | ||
| Change the DTB file for i2c-2 (i2c channel #2) | Change the DTB file for i2c-2 (i2c channel #2) | ||
| <code> | <code> | ||
| - | dtput -t i /media/boot/meson64_odroidc2.dtb /i2c@c11087c0 master_i2c_speed "100000" | + | fdtput -t i /media/boot/meson64_odroidc2.dtb /i2c@c11087c0 master_i2c_speed "100000" |
| sync | sync | ||
| reboot | reboot | ||
| </code> | </code> | ||
| - | If you want to go back to original 400Khz mode, change "100000" to "400000".\\ | + | If you want to go back to original 300Khz mode, change "100000" to "300000".\\ |
| - | **Actual I2C clock speed.** \\ | + | **Actual I2C clock speed** (Measured with an oscilloscope)\\ |
| - | In 400Khz mode : 270Khz \\ | + | In 300Khz mode : 270Khz \\ |
| In 100Khz mode : 80Khz \\ | In 100Khz mode : 80Khz \\ | ||
| + | |||
| + | **Default I2C clock speed** \\ | ||
| + | C1/C1+/C0 : 100Khz mode \\ | ||
| + | C2 : 400Khz mode \\ | ||
| ===== Tutorials ===== | ===== Tutorials ===== | ||
