CODEWITHSUNDEEP
uartbeagleboneblackpins
user3464059
user3464059

Reputation: 21

Enable RTS pin on Beaglebone Black UART1

I want to use RTS pin of UART1 to communicate through RS 485 protocol.

I have enabled UART1 through 

   /media/BEAGLEBONE/uEnv.txt
   optargs=quiet drm.debug=7 capemgr.enable_partno=BB-UART1

Device tree overlay snippet:

 0x180 0x20 /* uart1_rxd | MODE0 */

 0x184 0x20 /* uart1_txd | MODE0 */

 0x17c 0x00 /* uart1_rts | MODE0 */

 0x178 0x00 /* uart1_cts | MODE0 */            

 cat /proc/tty/driver/OMAP-SERIAL

serinfo:1.0 driver revision: 

 0: uart:OMAP UART0 mmio:0x44E09000 irq:72 tx:2818 rx:100 RTS|CTS|DTR|DSR        
 1: uart:OMAP UART1 mmio:0x48022000 irq:73 tx:0 rx:0 CTS|DSR|CD|RI

How to enable RTS pin on P9.19 by selecting mode 0 ?

Upvotes: 2

Views: 4426

Answers (1)

Varka Bhadram
Varka Bhadram

Reputation: 11

The muxing mode of the pins both set to same mode. Change it to:

                0x180 0x20 /* UART1_RXD, INPUT | MODE0 */
                0x184 0x00 /* UART1_TXD, OUTPUT | MODE0 */
                0x17c 0x00 /*UART1_RTS*/
                0x178 0x20 /*UART1_CTS*/

To use the RTS pin send the pin number from the overlay.

                rts-gpio = <&gpio0 13 0>

Upvotes: 1

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