Uart2 receives and sends no data

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Uart2 receives and sends no data

2,572 Views
muaxi8
Contributor V

lx2080a customer board.

Uart1 is my debugging printf serial port。

Uart2 is the serial port through which I communicate with CPLD。

now ,Under the kernel recognizes the uart2 which is ttyAMA1。

root@localhost:~# ls /dev/ttyAMA0 -l
crw------- 1 root tty 204, 64 Dec 26 10:22 /dev/ttyAMA0
root@localhost:~# ls /dev/ttyAMA1 -l
crw-rw---- 1 root dialout 204, 65 Dec 26 10:21 /dev/ttyAMA1

 The CPLD cannot receive the data sent by the LX2080, and the CPU cannot receive the data sent by

the CPLD。

below is a simple test case code。There is no data sent or received at present。

muaxi8_0-1640598083351.png

 

int main()
{
        char recvbuf[100];
        int ret = 0, fd = 0;
        char send[2] = {0x55};

        if(fd == 0)
            fd = open("/dev/ttyAMA1", O_RDWR );
        if(ret <0)
        {
                perror("can not open ttyAMA1 \n");
                exit(1);
        }
        ret = write(fd,send, 1);
        if(ret <0)
        {
                perror("write  ttyS1 0x55 err \n");
                exit(1);
        }

        while(1)
        {
                memset(recvbuf, 0, sizeof(recvbuf));
                ret = read(fd, recvbuf, 90);
                printf("len: %d, recvbuf %s \n", ret, recvbuf);

        }

        close(fd);
 return 1;

 

muaxi8_1-1640598877189.png

 

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22 Replies

2,456 Views
ufedor
NXP Employee
NXP Employee

Please provide U-Boot booting log as textual attachment to check RCW.

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2,454 Views
muaxi8
Contributor V

RCW and UBOOT are attached

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2,448 Views
ufedor
NXP Employee
NXP Employee

Please use CodeWarrior debugger to attach to the running processor and write data directly to the UART2 UARTDR. Check the UART2_SOUT by means of a digital scope.

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2,441 Views
muaxi8
Contributor V

 write data directly to the UART2 UARTDR, cpld can capture the date.

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2,435 Views
ufedor
NXP Employee
NXP Employee

Ensure that in the u-boot/configs/lx2160rdb_tfa_defconfig is present the following setting:
CONFIG_CONS_INDEX=2

and apply attached patch.

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2,430 Views
muaxi8
Contributor V

CONFIG_CONS_INDEX=2,that is set the debug serial port to Uart2, my debug serial port is now Uart1,

this value cannot be changed. Uart2 is the interface for me to communicate with CPLD. So I should not

change “CONFIG_CONS_INDEX=2“

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2,425 Views
ufedor
NXP Employee
NXP Employee

Please try "CONFIG_SERIAL_PROBE_ALL=y" instead of "CONFIG_CONS_INDEX=2"

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2,421 Views
muaxi8
Contributor V

there is no  CONFIG_SERIAL_PROBE_ALL in uboot

muaxi8_0-1640673280748.png

 

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2,416 Views
ufedor
NXP Employee
NXP Employee

Insert into the u-boot/configs/lx2160rdb_tfa_defconfig

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2,414 Views
muaxi8
Contributor V

Do you mean to add new variable "CONFIG_SERIAL_PROBE_ALL" ?

 

Is an index of an array and replacing it with CONFIG_SERIAL_PROBE_ALL is problematic .

 

muaxi8_0-1640674065947.png

 

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2,409 Views
ufedor
NXP Employee
NXP Employee

Please add new line:

CONFIG_SERIAL_PROBE_ALL=y

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2,406 Views
muaxi8
Contributor V

I'm sure it doesn't make any sense to define this variable, because the uboot source doesn't use this

variable

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2,400 Views
ufedor
NXP Employee
NXP Employee
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2,370 Views
muaxi8
Contributor V

After the patch is installed, uart2 still does not receive or send data

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2,365 Views
ufedor
NXP Employee
NXP Employee

Have you added the line:

CONFIG_SERIAL_PROBE_ALL=y

?

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2,362 Views
muaxi8
Contributor V

yes

muaxi8_1-1640748511696.png

 

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2,360 Views
ufedor
NXP Employee
NXP Employee

What is the issue state after applying the patch and the setting?

Is it still "Uart2 receives and sends no data"?

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2,189 Views
muaxi8
Contributor V

I wonder if there are other patches

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2,302 Views
muaxi8
Contributor V

I executed the UART read-write demo.

then,I checked the uart interrupts in /proc/interrupts ,but found no CPU interrupt count for UART2 :

root@localhost:~# cat /proc/interrupts |egrep -i uart
18: 6703 0 0 0 0 0 0 0 GICv3 64 Level uart-pl011
19: 0 0 0 0 0 0 0 0 GICv3 65 Level uart-pl011

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2,336 Views
muaxi8
Contributor V

Can you confirm that UART2 of LX2080A can be used normally ?

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