Error in configuring UART pins in SDK2.3.0

[Sachin Rawat]

Hi there,

I have recently switched my complete "Bluetooth Peripheral" Project from the SDK version 1.9.1 to 2.3.0 

I have been facing some of the pin control issue for the UART, as I have observe you have change the way the UART is working and added the pinctrl functionality.

Previously on the 1.9.1, I was using the UART pins shown under.

&uart0 {
	rts-pin = < 0xff >;
	cts-pin = < 0xff >;
};

&uart2 {
	current-speed = <9600>;
	status = "okay";
	tx-pin = <4>;  
	rx-pin = <5>;
	rts-pin = < 0xff >;
	cts-pin = < 0xff >;
	rx-pull-up;
};

I am using this UART2 for communicating with the BMS(Battery management system), but now in the new SDK when using the same pin configuration, I am getting the error 

"d:\v2.3.0\zephyr\include\zephyr\toolchain\gcc.h:78:36: error: static assertion failed: "/soc/peripheral@50000000/uart@b000 defined without required pin configuration""

"d:\v2.3.0\zephyr\include\zephyr\toolchain\gcc.h:78:36: error: static assertion failed: "/soc/peripheral@50000000/uart@b000 has legacy *-pin properties defined although PINCTRL is enabled"

I am using SDK 2.3.0, and my board is the Nordic Thingy53.

Could you please advise on how to resolve this error and properly configure the UART on my SoC?

Regards 
Sachin

[Menon]

Hello sachin,

As RossJ  mentioned it is a major change from NCS 1.9.x to 2.x.x, see the Migration guide. Introduced pinctrl which is a standard API for configuring the peripheral pins. You can go through this tutorial from Nordic for understanding the UART communication with NCS v2.x..x. But I suspect the error you are seeing now is not because of this. Could you run your code with a debugger and take look where it is crashing.

I recommend you to try configuring UART before running the whole project and see whether it's working fine or not? Please expect a delay after this response since it is a holiday week here in Norway.

Kind Regards,

Abhijith

[Sachin Rawat]

Hi RossJ ,  

 Menon  thanks for giving me this tutorial link.

I have gone as per the tutorial

set all these values to y 

CONFIG_UART_ASYNC_API=y

CONFIG_NRFX_UARTE0=y

CONFIG_SERIAL=y

CONFIG_UART_NRFX=y

added the header file, and at last added this line 

bms_uart = DEVICE_DT_GET(DT_NODELABEL(uart2));

  if (!device_is_ready(bms_uart)) {

    printk("Failed to get UART2 binding\n");

}

This is my .overlay

&uart2 {
    current-speed = <9600>;
    status = "okay";    
    pinctrl-0 = <&uart2_default>;
    pinctrl-1 = <&uart2_sleep>;
    pinctrl-names = "default", "sleep";
};
&pinctrl {
    uart2_default: uart2_default {
        group1 {
            psels = <NRF_PSEL(UART_TX, 0, 4)>;
        };
        group2 {
            psels = <NRF_PSEL(UART_RX, 0, 5)>;
            bias-pull-up;
        };
    };

    uart2_sleep: uart2_sleep {
        group1 {
            psels = <NRF_PSEL(UART_TX, 0, 4)>,
                <NRF_PSEL(UART_RX, 0, 5)>;
            low-power-enable;
        };
    };
};

But it is showing this error 

*** Booting Zephyr OS build v3.2.99-ncs2 ***
02> [00:00:17.387,420] <inf> fs_nvs: nvs_mount: 8 Sectors of 4096 bytes
02> [00:00:17.388,092] <inf> fs_nvs: nvs_mount: alloc wra: 0, fd0
02> [00:00:17.388,702] <inf> fs_nvs: nvs_mount: data wra: 0, 1a
02> Bluetooth initialized as slave
02> [00:00:17.407,897] <err> os: usage_fault: ***** USAGE FAULT *****
02> [00:00:17.408,508] <err> os: usage_fault:   Illegal use of the EPSR
02> [00:00:17.409,118] <err> os: esf_dump: r0/a1:  0x0004ac2c  r1/a2:  0x20007294  r2/a3:  0x0000000d
02> [00:00:17.409,973] <err> os: esf_dump: r3/a4:  0x000003e8 r12/ip:  0x00000000 r14/lr:  0x0001aabf
02> [00:00:17.410,797] <err> os: esf_dump:  xpsr:  0x00000000
02> [00:00:17.411,407] <err> os: esf_dump: s[ 0]:  0x00000000  s[ 1]:  0x00000000  s[ 2]:  0x00000000  s[ 3]:  0x00000000
02> [00:00:17.412,414] <err> os: esf_dump: s[ 4]:  0x00000000  s[ 5]:  0x00000000  s[ 6]:  0x00000000  s[ 7]:  0x00000000
02> [00:00:17.413,421] <err> os: esf_dump: s[ 8]:  0x00000000  s[ 9]:  0x00000000  s[10]:  0x00000000  s[11]:  0x00000000
02> [00:00:17.414,428] <err> os: esf_dump: s[12]:  0x00000000  s[13]:  0x00000000  s[14]:  0x00000000  s[15]:  0x00000000
02> [00:00:17.415,435] <err> os: esf_dump: fpscr:  0x00000000
02> [00:00:17.416,015] <err> os: esf_dump: Faulting instruction address (r15/pc): 0x00000000
02> [00:00:17.416,717] <err> os: z_fatal_error: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
02> [00:00:17.417,480] <err> os: z_fatal_error: Current thread: 0x20004040 (unknown)
02> [00:00:17.423,217] <err> fatal_error: k_sys_fatal_error_handler: Resetting system[0m