XMOS XK-AUDIO-316-MC-AB Hardware Manual page 17

13 General purpose user interface
4 green LEDs and 3 buttons are provided for general purpose user interfacing.
The figure below shows the layout of the user interface subsection:
Figure 19:
User interface
components
The signal mapping of the user interface components is shown in Figure
Board Net
LED_0
LED_1
LED_2
LED_3
BUT_0
Figure 20:
BUT_1
User interface
GPIO
BUT_2
14 I2C bus address map
Due to a conflict in I2C slave addresses, two I2C buses are used on the board. These
buses are multiplexed onto the xcore.ai I2C bus using a PCA9540B 2-channel I2C-bus
multiplexer. This allows the I2C bus to be used (0 or 1) to be selected over I2C.
I2C slave address (7 bit)
0x70
17
xcore.ai Multichannel Audio Board 1v1 Hardware Manual
xCORE GPIO Port
X0D28 P4F0
X0D29 P4F1
X0D30 P4F2
X0D31 P4F3
X0D26 P4E0
X0D27 P4E1
X0D32 P4E2
Device
NXP PCA9540B 2-channel I2C-bus multiplexer
Description
LED Output 0. Set high to light LED.
LED Output 1. Set high to light LED.
LED Output 2. Set high to light LED.
LED Output 3. Set high to light LED.
Button input 0. High = not pressed.
Button input 1. High = not pressed.
Button input 2. High = not pressed.
20