I²C
Emlid OES Prime has 4x I2C interfaces:
| Port | Device | SCK Pin | SDA Pin | Pull-Up |
|---|---|---|---|---|
| I2C0 | /dev/i2c-0 | PA11 | PA12 | Yes |
| I2C1 | /dev/i2c-1 | PA18 | PA19 | No |
| I2C2 | /dev/i2c-2 | PE12 | PE13 | Yes |
| S_I2C | /dev/i2c-3 | PL0 | PL1 | Yes |
In this example, we connect an I2C device (a breakout board that includes MS5611 pressure sensor) and detect it.
Attaching board
Connect SDA and SCK directly to the PA12 and PA11 pins.
Provide the power to your board and connect to the GND.
| Board | OES Prime | Purpose |
|---|---|---|
| VCC | 5V_IN | Power |
| GND | GND | Ground |
| SCL | PA11 | I2C clock |
| SDA | PA12 | I2C data |
Detecting sensor
1) Try to detect I2C adapter:
i2cdetect -y 0 0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77MS5611 usually can be found at the address of 0x77, but when the CSB pin (Chip Select which is used
to enable/disable the interface) is pulled high, the address may change to 0x76.