Forums - QCA4020 / CDB20 Multiple UARTs

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QCA4020 / CDB20 Multiple UARTs
raniglas
Join Date: 21 Jan 20
Posts: 7
Posted: Thu, 2020-01-23 15:36

Hi,

Our solution requires 2 serial ports. We would also like to be able to continue to use the serial port for debugging and QCLI inteface while using another 2 ports for the solution.

In the documentation we see reference to GPIOs for 5 UARTs, namely M0&M4 UART0, M0&M4 UART2, HS_UART0_DM, HS_UART1_DM, HS_UART2_DM.

However, in the SDK there is only reference to 2 UARTs - Debug and HS.

Is there any documentation on how to access HS_UARTx_DM? if so, where can we find more information about it?

Many thanks,

Rani

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manjulak Moderator
Join Date: 5 Dec 14
Posts: 33
Posted: Fri, 2020-01-24 16:34

QCA4020 has support for 2 UARTs (Debug and HSUART).

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raniglas
Join Date: 21 Jan 20
Posts: 7
Posted: Tue, 2020-01-28 20:48

Hi manjulak,

We tried to map the Debug UART to GPIO24/25 by updating the GPIO configuration using qapi_TLMM_Get_Gpio functions.

However, it appears that even if we map GPIO24/25 to UART-M4 and set GPIO8/9 to GPIO (func0), then use qapi_UART_Open for debug uart, it is still using GPIO8/9 for debug uart.

Is there a way to use GPIO24/25 for the debug uart? using qapi? or any other way? if so, can you point us to the relevant documentation?

Many thanks,

Rani

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raja_pedada
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Join Date: 18 Jun 18
Location: San Jose
Posts: 300
Posted: Thu, 2020-01-30 15:40

CDB4020 device supports both HSUART and DebugUART.

In the current SDK, DebugUART uses GPIO8 and GPIO9. HSUART uses GPIO17 and GPIO60.

We can change the console port value under @QCLI_demo/src/qcli/pal.c 
+ PAL_CONSOLE_PORT  QAPI_UART_DEBUG_PORT_E // QAPI_UART_HS_PORT_E

When using QAPI_UART_DEBUG_PORT_E  , adjust the jumper settings as below:

  • J18-3 to J19-2 (GPIO 9)
  • J19-3 to J18-2 (GPIO 8) 


When using QAPI_UART_HS_PORT_E  , adjust the jumper settings as below:

 

  • J18-3 to J5-27 (GPIO 17)
  • J19-3 to J5-36 ( GPIO 60)
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