LISA-U2 series - System integration manual
UBX-13001118 - R27
System description
Page 102 of 183
C1-Public
Module operating mode indication:
The
GPIO14
and
GPIO5
pins can be configured to indicate module operating mode (idle mode versus
active or connected modes), properly setting the parameter <gpio_mode> of AT+UGPIOC command
to 11.
No GPIO pin is
configured by default to provide the “Module operating mode indication”.
The pin configured to provide the “Module operating mode indication” function is set as
•
Output / High, when the module is in active or connected mode
•
Output / Low, when the module is in idle mode (that can be reached if power saving is enabled by
+UPSV AT command: for further details, see the u-blox AT commands manual
The “Module operating mode indication” mode can be provided only on one pin at a time: it is not
possible to simultaneously set the same mode on another pin.
I2S digital audio interface:
The
GPIO6
,
GPIO7
,
GPIO8
,
GPIO9
pins are by default configured as the second I2S digital audio
interface (
I2S1_RXD
,
I2S1_TXD
,
I2S1_CLK
,
I2S1_WA
respectively).
Only these pins can be configured as the second I2S digital audio interface, correctly setting the
parameter <gpio_mode> of AT+UGPIOC command to 12 (default setting).
SPI serial interface:
GPIO10
,
GPIO11
,
GPIO12
,
GPIO13
and
GPIO14
pins are by default configured as the SPI / IPC serial
interface (
SPI_SCLK
,
SPI_MOSI
,
SPI_MISO
,
SPI_SRDY
and
SPI_MRDY
respectively).
Only these pins can be configured as the SPI / IPC serial interface, correctly setting the parameter
<gpio_mode> of AT+UGPIOC command to 13 (default setting).
General purpose input:
All the GPIOs can be configured as input to sense a high or low digital level through the AT+UGPIOR
command, setting the parameter <gpio_mode> of the AT+UGPIOC command to 1.
The “General purpose input” mode can be provided on more than one pin at a time: it is possible to
simultaneously set the same mode on another pin (also on all the GPIOs).
No GPIO pin is configured by default as
“General purpose input”.
The pin configured to provide the “General purpose input” function is set as
•
Input, to sense high or low digital level by the AT+UGPIOR command.
The pin can be connected on the application board to an output pin of an application processor to
sense the digital signal level.
General purpose output:
All the GPIOs can be configured as output to set the high or the low digital level through the
AT+UGPIOW command, setting the parameter <gpio_mode> of the +UGPIOC AT command to 0.
The “General purpose output” mode can be provided on more than one pin per time: it is possible to
simultaneously set the same mode on another pin (also on all the GPIOs).
No GPIO pin is configured by default as “General purpose output”.
The pin configured to prov
ide the “General purpose output” function is set as
•
Output / Low, if the parameter <gpio_out_val> of AT+UGPIOW command is set to 0
•
Output / High, if the parameter <gpio_out_val> of AT+UGPIOW command is set to 1
