Navman 20 User Manual
LA000577C © 2006 Navman New Zealand. All rights reserved. Proprietary information and specifications subject to change without notice.
21
Bit
Pad function
Pin
(LSB) 0
GPIO15/Fwd-Rev
27
1
GPIO1/Wheel Tick
28
2
GPIO3/Gyro In
8
3
GPIO5/SDI
25
4
GPIO6/SDO
24
5
GPIO7/SCLK
26
6
GPIO9/1PPS
29
(MSB) 7
GPIO10/GPS Fix
23
Table 3-3: Pin configuration of the GPIO lines
On the Jupiter 20 D, there is no control of GPIO15, GPIO1, GPIO3, GPIO5, GPIO6 or GPIO7,
and.all.references.to.these.pins.are.ignored.
In each of the messages described in the following sections,
In each of the messages described in the following sections,
x
.represents.a.hexadecimal.digit.
3.5.1 Configure port directions
$PSRF225,xx,xx[*CS] <CR> <LF>
Sets the direction of the GPIO pins. The first octet is the mask (which ports to override), the
second the new direction. A zero represents an input, and a one an output. This command
must be sent before attempting to manipulate or read any the specified GPIO. It also has the
effect of suspending the normal port functions on the pins specified. Normal operation will
resume following a hardware reset (including any use of the reset line in Push-to-Fix mode).
Response:
Response:
$PTTK,GPIO,DIR,xx,xx*CS
3.5.2 Set outputs
$PSRF226,xx[*CS] <CR> <LF>
Changes the specified outputs to high. Other outputs are not affected. There are no
Changes the specified outputs to high. Other outputs are not affected. There are no
changes to any pins that are configured as inputs.
Response:
$PTTK,GPIO,SET,xx*CS
3.5.3 Clear outputs
$PSRF227,xx[*CS] <CR> <LF>
Changes the specified outputs to low. Other outputs are not affected. There are no changes
to any pins that are configured as inputs.
Response:
Response:
$PTTK,GPIO,CLEAR,xx*CS
3.5.4 Read inputs
$PSRF228[*CS] <CR> <LF>
Returns the values on the input pins. Pins configured as outputs read as zero.
Returns the values on the input pins. Pins configured as outputs read as zero.
Response:
$PTTK,GPIO,READ,xx*CS
This message is sometimes output automatically.
3.6 GPS fix output
The GPS fix output is an active low output on pin 23 of the module. Whenever the unit has
either a 2D or a 3D fix, this output will be low. When the unit has no fix, the output will be high.
This function can be overridden and the pin used as GPIO10 using the commands described in
Section 3.5. The GPS fix output function returns after a reset.