UCC uart on MPC8321

marcbalemboy — Tue, 15 Sep 2015 11:29:14 GMT

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

Re: UCC uart on MPC8321

marcbalemboy — Fri, 02 Oct 2015 12:57:23 GMT

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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