Hi,
I used to be able to configure a console (SHELL) to run over a UART over USB connection (USB CDC ACM device) on Zephyr 2.5.0. With the latest version of nRF Connect SDK I am not able to run my SHELL over USB. This version of the SDK installs Zephyr 2.7.0 when I run "west update".
In Zephyr 2.7.0, I noticed that configuration parameters CONFIG_UART_CONSOLE_ON_DEV_NAME and CONFIG_UART_SHELL_ON_DEV_NAME are no longer valid. I was using those parameters to port the SHELL over USB. I now follow the examples given in zephyr/sample/subsys/shell.
Here is the code where I intiate the SHELL over USB:
dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_shell_uart));
if (!device_is_ready(dev) || usb_enable(NULL)) {
return;
}
while (!dtr) {
uart_line_ctrl_get(dev, UART_LINE_CTRL_DTR, &dtr);
k_sleep(K_MSEC(100));
}
Execution is stuck in this loop above.
If I omit those lines, then my console does not receive incoming characters. It only prints whatever information sent to it (through printk() for instance).
Here are my configuration parameters:
CONFIG_SERIAL=y
# Redirect console to CDC
CONFIG_USB_UART_CONSOLE=y
CONFIG_USB_DEVICE_PID=0x0101
CONFIG_USB_SELF_POWERED=n
CONFIG_USB_WORKQUEUE=y
CONFIG_USB_WORKQUEUE_STACK_SIZE=1024
CONFIG_USB_WORKQUEUE_PRIORITY=-1
CONFIG_USB_CDC_ACM=y
CONFIG_USB_CDC_ACM_RINGBUF_SIZE=1024
#CONFIG_USB_CDC_ACM_DEVICE_NAME="CDC_ACM"
#CONFIG_USB_CDC_ACM_DEVICE_COUNT=1
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_UART_LINE_CTRL=y
CONFIG_SHELL_BACKEND_SERIAL_INIT_PRIORITY=51
#CONFIG_DEVICE_SHELL=y
#CONFIG_KERNEL_SHELL=y
#Shell through COM port
CONFIG_SHELL=y
CONFIG_CONSOLE=y
CONFIG_STDOUT_CONSOLE=y
CONFIG_SHELL_BACKEND_SERIAL=y
CONFIG_SHELL_BACKENDS=y
My dts overlay file has the following lines to support SHELL over USB:
/ {
chosen {
zephyr,console = &cdc_acm_uart0;
};
};
&zephyr_udc0 {
cdc_acm_uart0: cdc_acm_uart0 {
compatible = "zephyr,cdc-acm-uart";
label = "CDC_ACM_0";
};
};
Anyone saw the same problem and/or has a solution for it ?
Philippe O'Reilly
