Can't get USB_CDC_ACM and a separate Async UART to coexist

[Saxman58]

On the nRF5340, we have firmware working well for UART3 at 1 Mbaud with the Async API using the following config settings:

# UART support using the asynchronous API and DMA (instead of interrupt or polling)
CONFIG_SERIAL=y
CONFIG_UART_ASYNC_API=y
# Use hardware timer rather than interrupts to count RX bytes to avoid missed counts at high baudrates:
CONFIG_UART_3_NRF_HW_ASYNC=y
CONFIG_UART_3_NRF_HW_ASYNC_TIMER=1

We also need to have the USB port configured as a separate CDC virtual UART.  The problem is that as soon as we enable the USB (by adding CONFIG_USB_DEVICE_STACK=y to the prj.conf, with or without a CONFIG_USB_CDC_ACM=y line), the compiler reports errors in the UART macro expansions.  It looks like there is no timer instance to insert in the uart_nrfx_config structure.

Removing the NRF_HW_ASYNC lines from prj.conf lets it compile, but without the timer hardware to count the incoming bytes, we lose byte counts at 1 Mbaud.

I saw some other posts with somewhat similar problems getting the USB CDC UART and another UART to coexist.  I notice that when CONFIG_USB_DEVICE_STACK=y is set, that 

#define CONFIG_UART_INTERRUPT_DRIVEN 1

gets inserted into the autoconf.h file.  This contradicts by setting above:

CONFIG_UART_ASYNC_API=y

Is this part of the problem?  Does the USB CDC UART only support the interrupt API?  And does that mean that I cannot use the Async API on a different UART port?  I sure hope I don't have to rewrite that UART code!

Here is the compiler error output, a huge blowup of macro expansions, but essentially it is complaining about the lack of the .timer member in the uarte_nrfx_config.  This does not happen when the CONFIG_USB_DEVICE_STACK is turned off.

In file included from /opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:34,
                 from /opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/irq_multilevel.h:15,
                 from /opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/devicetree.h:20,
                 from /opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/device.h:12,
                 from /opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/drivers/uart.h:26,
                 from /opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:11:
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:27: error: 'const struct uarte_nrfx_config' has no member named 'timer'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                           ^~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1986:29: warning: braces around scalar initializer
 1986 |         static const struct uarte_nrfx_config uarte_##idx##z_config = {        \
      |                             ^~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1986:29: note: (near initialization for 'uarte_3z_config.pcfg')
 1986 |         static const struct uarte_nrfx_config uarte_##idx##z_config = {        \
      |                             ^~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:64:5: error: field name not in record or union initializer
   64 |     .p_reg            = NRFX_CONCAT_2(NRF_TIMER, id),             \
      |     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:64:5: note: (near initialization for 'uarte_3z_config.pcfg')
   64 |     .p_reg            = NRFX_CONCAT_2(NRF_TIMER, id),             \
      |     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/mdk/nrf5340_application.h:3396:37: warning: initialization of 'const struct pinctrl_dev_config *' from incompatible pointer type 'NRF_TIMER_Type *' [-Wincompatible-pointer-types]
 3396 | #define NRF_TIMER1_S                ((NRF_TIMER_Type*)         NRF_TIMER1_S_BASE)
      |                                     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/modules/hal_nordic/nrfx/./nrfx_config.h:757:23: note: in expansion of macro 'NRF_TIMER1_S'
  757 | #define NRF_PERIPH(P) P##_S
      |                       ^
/opt/nordic/ncs/v2.6.1/zephyr/modules/hal_nordic/nrfx/./nrfx_config_nrf5340_application.h:60:26: note: in expansion of macro 'NRF_PERIPH'
   60 | #define NRF_TIMER1       NRF_PERIPH(NRF_TIMER1)
      |                          ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:168:32: note: in expansion of macro 'NRF_TIMER1'
  168 | #define NRFX_CONCAT_2_(p1, p2) p1 ## p2
      |                                ^~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:165:31: note: in expansion of macro 'NRFX_CONCAT_2_'
  165 | #define NRFX_CONCAT_2(p1, p2) NRFX_CONCAT_2_(p1, p2)
      |                               ^~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:64:25: note: in expansion of macro 'NRFX_CONCAT_2'
   64 |     .p_reg            = NRFX_CONCAT_2(NRF_TIMER, id),             \
      |                         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/mdk/nrf5340_application.h:3396:37: note: (near initialization for 'uarte_3z_config.pcfg')
 3396 | #define NRF_TIMER1_S                ((NRF_TIMER_Type*)         NRF_TIMER1_S_BASE)
      |                                     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/modules/hal_nordic/nrfx/./nrfx_config.h:757:23: note: in expansion of macro 'NRF_TIMER1_S'
  757 | #define NRF_PERIPH(P) P##_S
      |                       ^
/opt/nordic/ncs/v2.6.1/zephyr/modules/hal_nordic/nrfx/./nrfx_config_nrf5340_application.h:60:26: note: in expansion of macro 'NRF_PERIPH'
   60 | #define NRF_TIMER1       NRF_PERIPH(NRF_TIMER1)
      |                          ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:168:32: note: in expansion of macro 'NRF_TIMER1'
  168 | #define NRFX_CONCAT_2_(p1, p2) p1 ## p2
      |                                ^~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:165:31: note: in expansion of macro 'NRFX_CONCAT_2_'
  165 | #define NRFX_CONCAT_2(p1, p2) NRFX_CONCAT_2_(p1, p2)
      |                               ^~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:64:25: note: in expansion of macro 'NRFX_CONCAT_2'
   64 |     .p_reg            = NRFX_CONCAT_2(NRF_TIMER, id),             \
      |                         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:65:5: error: field name not in record or union initializer
   65 |     .instance_id      = NRFX_CONCAT_3(NRFX_TIMER, id, _INST_IDX), \
      |     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:65:5: note: (near initialization for 'uarte_3z_config.pcfg')
   65 |     .instance_id      = NRFX_CONCAT_3(NRFX_TIMER, id, _INST_IDX), \
      |     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:65:39: warning: excess elements in scalar initializer
   65 |     .instance_id      = NRFX_CONCAT_3(NRFX_TIMER, id, _INST_IDX), \
      |                                       ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:186:35: note: in expansion of macro 'NRFX_CONCAT_3_'
  186 | #define NRFX_CONCAT_3(p1, p2, p3) NRFX_CONCAT_3_(p1, p2, p3)
      |                                   ^~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:65:25: note: in expansion of macro 'NRFX_CONCAT_3'
   65 |     .instance_id      = NRFX_CONCAT_3(NRFX_TIMER, id, _INST_IDX), \
      |                         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:65:39: note: (near initialization for 'uarte_3z_config.pcfg')
   65 |     .instance_id      = NRFX_CONCAT_3(NRFX_TIMER, id, _INST_IDX), \
      |                                       ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:186:35: note: in expansion of macro 'NRFX_CONCAT_3_'
  186 | #define NRFX_CONCAT_3(p1, p2, p3) NRFX_CONCAT_3_(p1, p2, p3)
      |                                   ^~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:65:25: note: in expansion of macro 'NRFX_CONCAT_3'
   65 |     .instance_id      = NRFX_CONCAT_3(NRFX_TIMER, id, _INST_IDX), \
      |                         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:66:5: error: field name not in record or union initializer
   66 |     .cc_channel_count = NRF_TIMER_CC_CHANNEL_COUNT(id),           \
      |     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:66:5: note: (near initialization for 'uarte_3z_config.pcfg')
   66 |     .cc_channel_count = NRF_TIMER_CC_CHANNEL_COUNT(id),           \
      |     ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/mdk/nrf5340_application_peripherals.h:136:23: warning: excess elements in scalar initializer
  136 | #define TIMER1_CC_NUM 6
      |                       ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:189:36: note: in expansion of macro 'TIMER1_CC_NUM'
  189 | #define NRFX_CONCAT_3_(p1, p2, p3) p1 ## p2 ## p3
      |                                    ^~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:186:35: note: in expansion of macro 'NRFX_CONCAT_3_'
  186 | #define NRFX_CONCAT_3(p1, p2, p3) NRFX_CONCAT_3_(p1, p2, p3)
      |                                   ^~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/hal/nrf_timer.h:285:40: note: in expansion of macro 'NRFX_CONCAT_3'
  285 | #define NRF_TIMER_CC_CHANNEL_COUNT(id) NRFX_CONCAT_3(TIMER, id, _CC_NUM)
      |                                        ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:66:25: note: in expansion of macro 'NRF_TIMER_CC_CHANNEL_COUNT'
   66 |     .cc_channel_count = NRF_TIMER_CC_CHANNEL_COUNT(id),           \
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/mdk/nrf5340_application_peripherals.h:136:23: note: (near initialization for 'uarte_3z_config.pcfg')
  136 | #define TIMER1_CC_NUM 6
      |                       ^
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:72:26: note: in definition of macro '__DEBRACKET'
   72 | #define __DEBRACKET(...) __VA_ARGS__
      |                          ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:64:9: note: in expansion of macro '__GET_ARG2_DEBRACKET'
   64 |         __GET_ARG2_DEBRACKET(one_or_two_args _if_code, _else_code)
      |         ^~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_internal.h:59:9: note: in expansion of macro '__COND_CODE'
   59 |         __COND_CODE(_XXXX##_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:180:9: note: in expansion of macro 'Z_COND_CODE_1'
  180 |         Z_COND_CODE_1(_flag, _if_1_code, _else_code)
      |         ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/include/zephyr/sys/util_macro.h:224:9: note: in expansion of macro 'COND_CODE_1'
  224 |         COND_CODE_1(_flag, _code, ())
      |         ^~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1996:17: note: in expansion of macro 'IF_ENABLED'
 1996 |                 IF_ENABLED(CONFIG_UART_##idx##_NRF_HW_ASYNC,                   \
      |                 ^~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:189:36: note: in expansion of macro 'TIMER1_CC_NUM'
  189 | #define NRFX_CONCAT_3_(p1, p2, p3) p1 ## p2 ## p3
      |                                    ^~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/nrfx_common.h:186:35: note: in expansion of macro 'NRFX_CONCAT_3_'
  186 | #define NRFX_CONCAT_3(p1, p2, p3) NRFX_CONCAT_3_(p1, p2, p3)
      |                                   ^~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/hal/nrf_timer.h:285:40: note: in expansion of macro 'NRFX_CONCAT_3'
  285 | #define NRF_TIMER_CC_CHANNEL_COUNT(id) NRFX_CONCAT_3(TIMER, id, _CC_NUM)
      |                                        ^~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/modules/hal/nordic/nrfx/drivers/include/nrfx_timer.h:66:25: note: in expansion of macro 'NRF_TIMER_CC_CHANNEL_COUNT'
   66 |     .cc_channel_count = NRF_TIMER_CC_CHANNEL_COUNT(id),           \
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:1997:35: note: in expansion of macro 'NRFX_TIMER_INSTANCE'
 1997 |                         (.timer = NRFX_TIMER_INSTANCE(                         \
      |                                   ^~~~~~~~~~~~~~~~~~~
/opt/nordic/ncs/v2.6.1/zephyr/drivers/serial/uart_nrfx_uarte.c:2078:1: note: in expansion of macro 'UART_NRF_UARTE_DEVICE'
 2078 | UART_NRF_UARTE_DEVICE(3);
      | ^~~~~~~~~~~~~~~~~~~~~
ninja: build stopped: subcommand failed.

[Håkon Alseth]

Hi,

 

It is true that usb cdc acm requires uart to be interrupt driven, but this is selectable on a instance level.

Here's the sequence I ran on the zephyr/samples/subsys/usb/cdc_acm sample.

app.overlay:

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

&zephyr_udc0 {
	cdc_acm_uart0 {
		compatible = "zephyr,cdc-acm-uart";
	};
};

&uart3 {
    status = "okay";
    current-speed = <115200>;  // Set your desired baud rate
    pinctrl-0 = <&uart3_default>;
    pinctrl-1 = <&uart3_sleep>;
    pinctrl-names = "default", "sleep";
};

&pinctrl {
    uart3_default: uart3_default {
        group1 {
            psels = <NRF_PSEL(UART_RX, 1, 10)>,
                   <NRF_PSEL(UART_TX, 1, 11)>;
        };
    };
    
    uart3_sleep: uart3_sleep {
        group1 {
            psels = <NRF_PSEL(UART_RX, 1, 10)>,
                   <NRF_PSEL(UART_TX, 1, 11)>;
            low-power-enable;
        };
    };
};

test.conf:

CONFIG_UART_ASYNC_API=y
CONFIG_UART_INTERRUPT_DRIVEN=y

CONFIG_UART_0_ASYNC=n
CONFIG_UART_0_INTERRUPT_DRIVEN=y

CONFIG_UART_3_INTERRUPT_DRIVEN=n
CONFIG_UART_3_ASYNC=y
CONFIG_UART_3_NRF_HW_ASYNC=y
CONFIG_UART_3_NRF_HW_ASYNC_TIMER=1
CONFIG_NRFX_TIMER1=y

 

Could you try these configurations and see if it works?

 

Kind regards,

Håkon