UCC uart on MPC8321

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UCC uart on MPC8321

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marcbalemboy
Contributor I

Hello,

     On a MPC8321, i'm trying to get UCC5 to work in uart mode (with linux).

     When i try to send a message, Tx pin is activated (high) but never actually transmit data, ready bit never go down.

     CTS is high, but pio is configured as GPIO, so it shouldn't matter, right ?

    

     In loopback mode (GUMR_L[DIAG] = 0x01), it doesn't seem to get any better.

     The following configuration is used in dts :

ucc5pio:ucc_pin@05 {

                                pio-map = <

                                        2    0    1      0    2    0  /* TxD5 */

                                        2    8    2      0    2    0  /* RxD5 */

                                        2   29    2      0    0    0  /* CTS5 */

                                        2   31    1      0    0    0  /* RTS5 */

                                >;

                        };

ucc@2400 {

                        device_type = "serial";

                        compatible = "ucc_uart";

                        cell-index = <5>;       /* The UCC number, 1-7*/

                        port-number = <0>;      /* Which ttyQEx device */

                        //soft-uart;            /* We need Soft-UART */

                        reg = <0x2400 0x200>;

                        interrupts = <40>;      /* From Table 18-12 */

                        interrupt-parent = < &qeic >;

                        /*

                         * For Soft-UART, we need to set TX to 1X, which

                         * means specifying separate clock sources.

                         */

                        rx-clock-name = "brg6";

                        tx-clock-name = "brg5";

                        pio-handle = < &ucc5pio >;

                };

               Is there something i'm missing out ?

regards

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488 Views
marcbalemboy
Contributor I

Well my problem is still not resolved.

I've tried using UCC3 in loopback mode, but i hang at the same point, ready bit never go down.

Checking set up of the driver, I've noticed that programming sequence with soft-uart patch does not follow  what's described in SOFTUARTUCODERN_0_1_2.pdf (Table 0-6) :

0x94 SoftUART_RxState          Word         QE internal,           initialize to 0x04

0x9D SoftUART_RxBitmark      Byte           QE internal,          initialize to 0x7

both are initialized to 0 in linux drivers (ucc_uart.c line 722).

Is this a mistake or is there some other document provinding instruction for using soft_uart microcode  that I've missed ?

regards,

Marc

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