Changes between Version 5 and Version 6 of serial

Timestamp:

12/27/2017 07:32:29 PM (7 years ago)

Author:

Tim Harvey

Comment:

added gpio details for Newport serial transceiver

serial

@@ -637 +637 @@
 
 === Newport ===
-Most Newport products have a flexible [http://dev.gateworks.com/datasheets/sp335e.pdf MaxLinear SP335E] RS-232/RS-485/RS-422 transceiver which is software configurable. For these boards the Bootloader {{{hwconfig}}} environment variable can be used to configure the functionality of the serial ports at power-up. See [wiki:newport/#hwconfig Newport bootloader hwconfig] for more details.
+Most Newport products have a flexible [http://dev.gateworks.com/datasheets/sp335e.pdf MaxLinear SP335E] RS-232/RS-485/RS-422 transceiver which is software configurable. For these boards the Bootloader {{{hwconfig}}} environment variable can be used to configure the functionality of the serial ports at power-up between dual RS232 without flow control (default), single RS232 with hardware flow control, and RS485 (full/half duplex and optional termination). See [wiki:newport/#hwconfig Newport bootloader hwconfig] for more details.
+
+If you wish to configure the SP335E transceiver yourself you can control it at runtime through the following GPIO's (which is what the Boot firmware will do for you via the {{{hwconfig}}} variable):
+ * GPIO21: UART_HALF - selects full (low) or half (high) duplex (RS485 mode only)
+ * GPIO22: UART_TERM - disables (low) or enables (high) on-chip termination (RS485 mode only)
+ * GPIO23: UART_RS485 - selects between RS232 (low) and RS245 (high) modes
+
+See [wiki:gpio gpio] for details on using GPIO from Linux userspace or use the U-Boot bootloader {{{gpio}}} command.
+
 
 === Laguna: GW2382 ===