Additional UART not working

Hi,

I have enabled the uart3 by commenting out EIM_D25 and EIM_D24 gpio functionality and uncommenting their UART function in board-mx6qd_seco__UDOO.h and also added the necessary line to arch/arm/mach-mx6/board-mx6_seco_UDOO.c
After that I have recompiled the kernel....
When I look into dmesg I see 4 serial ports:

Code:

[    1.574322] imx-uart.0: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX
[    1.581209] imx-uart.1: ttymxc1 at MMIO 0x21e8000 (irq = 59) is a IMX
[    1.587705] console [ttymxc1] enabled, bootconsole disabled
[    1.599253] imx-uart.3: ttymxc3 at MMIO 0x21f0000 (irq = 61) is a IMX
[    1.606087] imx-uart.2: ttymxc2 at MMIO 0x21ec000 (irq = 60) is a IMX

I am expecting the new serial to be on physical pins 53 and 47 but even I tried all /dev/ttymxc devices using the minicom, I can't get connected to the device attached to the mentioned ports (the device does have opened serial port and is working with other serial devices like bus pirate or a ftdi usb...)

Could anyone please help me to find out what is wrong? Did I missed something?

Thanks!

 

anyone please?

 

hei maara.. any news about this? same issue 4 me :-( ... still trying..

 

HI guys,

we tried now to connect a UDOO quad running Ubuntu 12.04 to test extra uart ports. These are the steps that we followed:

1. In board-mx6qd_seco_UDOO.h we commented GPIO declaration and uncommented the UARTs TX and RX funtions.
So external pins:
D53 --> UART3 TX
D47 --> UART3 RX

2 In board-mx6_seco_UDOO.c be sure that:
imx6q_add_imx_uart(2, NULL); is declared.

Then recompile kernel.

3.Upload a sketch on SAM3X wherethe pins are in input mode to be sure to avoid level conflicts.
pinMode(47, INPUT);
pinMode(53, INPUT);

4. We used and Arduino Due like an external device with this sketch:

Code:

void setup() {
  Serial.begin(9600);
  Serial1.begin(9600);
}

void loop() {
  Serial1.println("ping");
  int msg = Serial1.read();
  Serial.println(msg);
  delay(200);
}

So you have to connect:

UDOO D47 --> Arduino Due TX1
UDOO D53 --> Arduino Due RX1
UDOO GND --> Arduino Due GND

(Remember the ground connections)

4. In a terminal (for the moment you need to be super user or change the device permission) you can read and write on ttymxc2

Code:

sudo su
cat /dev/ttymxc2
echo 1 > /dev/ttymxc2

You can check monitoring defaut serial port on arduino.

Let us know if it works

Sorry for the delay! )

 

Thanks!

I even didn't had to recompile the kernel as I obviously have done this correctly when I was trying to get it working for the first time
What is the only concern I have is:
/dev/ttymxc2 is the UART3 which I can use from linux to communicate with other devices right?
/dev/ttymxc3 is the internal port for the inter-processor communication so lets forget this one...
and /dev/ttymxc0 and /dev/ttymxc1 are on what pins? - these are on RX and TX arduino pins?

Thanks!