hi,
I am continuing the transition from MQX MQX 3.8 to 4.0.
I have a problem with the UART4.
I use the UART4 with reception interrupt "ittye".
With the RX l.MQX 4.0 does not work.
If I send a data on the TX, RX me back on with many other erroneous data.
I refer to this post: https://community.freescale.com/message/325979#325979
Maurizio
Solved! Go to Solution.
Hi Maurizio,
I'm using the TWR-K70F120M development kit and removed the Y5 crystal and soldered blue wire to the Y5 pins 1(UART4RX) and 3 (UART4TX).
I then jumpered the Y5 pin 1 to the TWR-SER J17 pin 1,
I then jumpered the Y5 pin 3 to the TWR-SER J19 pin 1.
Running the attached code in your MQX4.0/mqx/examples/io folder the initial printf() goes to the default serial output (i.e. pre-blue wire setup) and the output will look like:
printf("This is printed to the default device\n");
Continuing to step the code the UART4 (ttye:) gets open and is configured to be the default output. With the blue wire modification the TWR-SER DB9 terminal window will show:
printf("This is printed to the other device\n");
Lastly I did use PE (Processor Expert) on the BSP to disable any configuration of the PTE24/25 pins. You might check your code or use PE to do the same.
I've attached all files in BSP and application that I've enhanced for this test.
Regards,
David
Hi Maurizio,
I tested the UART4 on TWR-K70F120M several weeks ago using the MQX4.0/mqx/io example.
I had to update the init_gpio.c in the BSP to get the correct pin configuration.
Here is the edit I made in that file in function _bsp_serial_io_init():
case 4:
pctl = (PORT_MemMapPtr)PORTC_BASE_PTR;
if (flags & IO_PERIPHERAL_PIN_MUX_ENABLE)
{
/* PTC14 as RX function (Alt.3) + drive strength */
pctl->PCR[14] = 0 | PORT_PCR_MUX(3) | PORT_PCR_DSE_MASK;
/* PTC15 as TX function (Alt.3) + drive strength */
pctl->PCR[15] = 0 | PORT_PCR_MUX(3) | PORT_PCR_DSE_MASK;
}
Regards,
David
Thanks for the reply,
but, I started on the project and in production use for MQX 3.8 uart4, pins 24 and 25.
Now with MQX 4.0 does not work anymore.
I can not change the pin.
Maurizio
Hi Maurizio,
I'm using the TWR-K70F120M development kit and removed the Y5 crystal and soldered blue wire to the Y5 pins 1(UART4RX) and 3 (UART4TX).
I then jumpered the Y5 pin 1 to the TWR-SER J17 pin 1,
I then jumpered the Y5 pin 3 to the TWR-SER J19 pin 1.
Running the attached code in your MQX4.0/mqx/examples/io folder the initial printf() goes to the default serial output (i.e. pre-blue wire setup) and the output will look like:
printf("This is printed to the default device\n");
Continuing to step the code the UART4 (ttye:) gets open and is configured to be the default output. With the blue wire modification the TWR-SER DB9 terminal window will show:
printf("This is printed to the other device\n");
Lastly I did use PE (Processor Expert) on the BSP to disable any configuration of the PTE24/25 pins. You might check your code or use PE to do the same.
I've attached all files in BSP and application that I've enhanced for this test.
Regards,
David