CONFIG_LOG_BACKEND_SWO_FREQ_HZ

Set SWO output frequency

Type: int

Help

Set SWO output frequency. Value 0 will select maximum frequency
supported by the given MCU. Not all debug probes support high
frequency SWO operation. In this case the frequency has to be set
manually.

SWO value defined by this option will be configured at boot. Most SWO
viewer programs will configure SWO frequency when attached to the
debug probe. Such configuration will persist only until the device
reset. To ensure flawless operation the frequency configured here and
by the SWO viewer program has to match.

Direct dependencies

(LOG_BACKEND_SWO && BOARD_EFM32GG_SLWSTK6121A) || (LOG_BACKEND_SWO && BOARD_EFM32GG_STK3701A) || (LOG_BACKEND_SWO && BOARD_EFR32_RADIO) || (LOG_BACKEND_SWO && !LOG_FRONTEND && !LOG_MODE_MINIMAL && LOG)

(Includes any dependencies from ifs and menus.)

Defaults

• 875000

• 875000

• 875000

• 0

Kconfig definitions

At <Zephyr>/boards/arm/efm32gg_slwstk6121a/Kconfig.defconfig:29

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:22

Menu path: (Top)

config LOG_BACKEND_SWO_FREQ_HZ
    int
    default 875000
    depends on LOG_BACKEND_SWO && BOARD_EFM32GG_SLWSTK6121A

---

At <Zephyr>/boards/arm/efm32gg_stk3701a/Kconfig.defconfig:25

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:22

Menu path: (Top)

config LOG_BACKEND_SWO_FREQ_HZ
    int
    default 875000
    depends on LOG_BACKEND_SWO && BOARD_EFM32GG_STK3701A

---

At <Zephyr>/boards/arm/efr32_radio/Kconfig.defconfig:21

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:22

Menu path: (Top)

config LOG_BACKEND_SWO_FREQ_HZ
    int
    default 875000
    depends on LOG_BACKEND_SWO && BOARD_EFR32_RADIO

---

At <Zephyr>/subsys/logging/Kconfig.backends:69

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:44 → <Zephyr>/subsys/Kconfig:31 → <Zephyr>/subsys/logging/Kconfig:23

Menu path: (Top) → Sub Systems and OS Services → Logging → Backends → Enable Serial Wire Output (SWO) backend

config LOG_BACKEND_SWO_FREQ_HZ
    int "Set SWO output frequency"
    default 0
    depends on LOG_BACKEND_SWO && !LOG_FRONTEND && !LOG_MODE_MINIMAL && LOG
    help
      Set SWO output frequency. Value 0 will select maximum frequency
      supported by the given MCU. Not all debug probes support high
      frequency SWO operation. In this case the frequency has to be set
      manually.

      SWO value defined by this option will be configured at boot. Most SWO
      viewer programs will configure SWO frequency when attached to the
      debug probe. Such configuration will persist only until the device
      reset. To ensure flawless operation the frequency configured here and
      by the SWO viewer program has to match.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)