Physical Input Devices; Limitations; Table 12. Port Assignment For Control Of Physical Input Devices - ST STM32L4R9I User Manual

Hardware layout and configuration
6.17

Physical input devices

The STM32L4R9I-EVAL main board provides several input devices for physical human
control, listed below:
•
Four-way joystick controller with select key (B1)
•
Wake-up/ tamper button (B3)
•
Reset button (B2)
•
10 kΩ potentiometer (RV2)
•
Light-dependent resistor, LDR (R121)
The potentiometer and the light-dependent resistor are mutually exclusively routable to either
the PB4 or PA0 port of STM32L4R9AII6.
configuration jumpers.
As illustrated in the schematic diagram, the PB4 port is routed, in the STM32L4R9AII6, to the
noninverting input of comparator Comp2. The PA0 is routed to the noninverting input of the
operational amplifier OpAmp1.
Jumper
JP9
JP5
JP9
JP5
JP9
JP5
JP9
JP5
6.17.1

Limitations

The potentiometer and the light-dependent resistor are exclusive to MFX, the audio codec,
OCTOSPIP1, the debugging connector, and MC operation. They are mutually exclusive.
36/77

Table 12. Port assignment for control of physical input devices

Setting
2
1 3
1 2 3
2
1 3
1 2 3
2
1 3
1 2 3
2
1 3
1 2 3
UM2248 Rev 5
Table 12 depicts the setting of associated
A potentiometer is routed to pin PB4 o fSTM32L4R9AII6.
Default setting.: A potentiometer is routed to pin PA0 of
STM32L4R9AII6.
LDR is routed to pin PB4 of STM32L4R9AII6.
LDR is routed to pin PA0 of STM32L4R9AII6.
Routing
UM2248