Gpio_Xtra_Pin: 1114H-1144H; Serial Communication - Point Grey Flea3 FL3-U3 Technical Reference Manual

Point Grey Flea3 USB 3.0 Technical Reference
Field
Data
Pwm_Count
En_Pin
Disable_Pol
En_En
Pwm_Pol
4.4.2

GPIO_XTRA_PIN: 1114h-1144h

These registers contain mode specific data for the GPIO pins. Units are ticks of a 1.024MHz clock.
Pin Register
0 GPIO_XTRA_PIN_0
1 GPIO_XTRA_PIN_1
2 GPIO_XTRA_PIN_2
3 GPIO_XTRA_PIN_3
Format:
Field
Mode_Specific_1
Mode_Specific_2
4.5

Serial Communication

The camera is capable of serial communications at baud rates up to 115.2 Kbps via the on-board serial port built into
the camera's GPIO connector. The serial port uses TTL digital logic levels. If RS signal levels are required, a level
converter must be used to convert the TTL digital logic levels to RS voltage levels.
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
Bit
For Modes 0, 1, and 2: Data field
0 = 0 V (falling edge), 1 = +3.3 V (rising edge)
[31]
For Mode 4 (PWM): see below
Number of PWM pulses
Read: The current count; counts down the remaining pulses. After reaching zero, the count
[16-23] does not automatically reset to the previously-written value.
Write: Writing the number of pulses starts the PWM. Write 0xFF for infinite pulses. (Requires
write of 0x00 before writing a different value.)
[24] Reserved
The GPIO pin to be used as a PWM enable i.e. the PWM continues as long as the En_Pin is
[25-27]
held in a certain state (high or low).
[28] Reserved
Polarity of the PWM enable pin (En_Pin) that will disable the PWM. If this bit is 0, the PWM is
[29]
disabled when the PWM enable pin goes low.
0: Disable enable pin (En_Pin) functionality
[30]
1: Enable En_Pin functionality
Polarity of the PWM signal
[31]
0: Low, 1: High
1114h
1124h
1134h
1144h
Bit
[0-15] GPIO_MODE_4: Low period of PWM pulse (if Pwm_Pol = 0)
[16-31] GPIO_MODE_4: High period of PWM pulse (if Pwm_Pol = 0)
Description
Description
4 Input/Output Control
51