Zephyr use lot of memory for unused fonction

RE: Zephyr use lot of memory for unused fonction

Charlie — Mon, 19 Aug 2024 11:36:01 GMT

Normally our BLE sample is well optimized, I am not sure which sample you have referred to make your own BLE application. So one more thing worth to check is if your application has big different with the closest BLE sample.

RE: Zephyr use lot of memory for unused fonction

Charlie — Mon, 19 Aug 2024 11:19:27 GMT

I assume you are using nRF52833 now, you can easily switch to nRF52840 to get double size flash and memory if your application need more resources in the further.

RE: Zephyr use lot of memory for unused fonction

fabien-ch — Mon, 19 Aug 2024 10:56:43 GMT

Thank you for your answer. I've already follow this guide :

CONFIG_UART_INTERRUPT_DRIVEN=y

CONFIG_BOOTLOADER_MCUBOOT=y

CONFIG_FLASH=y

CONFIG_IMG_MANAGER=y

CONFIG_IMG_ENABLE_IMAGE_CHECK=y

CONFIG_MCUBOOT_IMG_MANAGER=y

CONFIG_IMG_ERASE_PROGRESSIVELY=y

CONFIG_REBOOT=y

CONFIG_PICOLIBC=y

CONFIG_PICOLIBC_IO_C99_FORMATS=n

#TO CHANGE

CONFIG_MAIN_STACK_SIZE=16384

CONFIG_BT=y

# Enable mcumgr.

CONFIG_MCUMGR=y

# Enable most core commands.

CONFIG_MCUMGR_CMD_IMG_MGMT=y

CONFIG_MCUMGR_CMD_OS_MGMT=y

# Allow for large Bluetooth data packets.

CONFIG_BT_BUF_ACL_RX_SIZE=255

CONFIG_BT_BUF_ACL_TX_SIZE=251

CONFIG_BT_BUF_CMD_TX_SIZE=255

CONFIG_BT_BUF_EVT_DISCARDABLE_SIZE=255

CONFIG_BT_L2CAP_TX_MTU=247

# Enable the Bluetooth (unauthenticated) and shell mcumgr transports.

CONFIG_MCUMGR_SMP_BT=y

CONFIG_MCUMGR_SMP_BT_AUTHEN=n

# Some command handlers require a large stack.

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192

CONFIG_MULTITHREADING=y

CONFIG_I2C=y

CONFIG_SIZE_OPTIMIZATIONS=y

CONFIG_FORCE_NO_ASSERT=y

CONFIG_WATCHDOG=y

# USB configuration

CONFIG_USB_DEVICE_STACK=y

CONFIG_CONSOLE=y

CONFIG_UART_CONSOLE=y

CONFIG_UART_LINE_CTRL=y

# Power management

CONFIG_PM=n

# Drivers and peripherals

CONFIG_PINMUX=n

CONFIG_SPI=n

# Boot

CONFIG_BOOT_BANNER=n

# Disable Bluetooth features not needed

CONFIG_BT_DEBUG_NONE=y

CONFIG_BT_ASSERT=n

CONFIG_BT_DATA_LEN_UPDATE=n

CONFIG_BT_PHY_UPDATE=n

CONFIG_BT_GAP_PERIPHERAL_PREF_PARAMS=n

CONFIG_BT_HCI_VS_EXT=n

# Disable Bluetooth controller features not needed

# CONFIG_BT_CTLR_PRIVACY=n

# CONFIG_BT_CTLR_PHY_2M=n

# Disable features not needed

CONFIG_LOG=n

CONFIG_ASSERT=n

CONFIG_USB_DEVICE_REMOTE_WAKEUP=n

---

I'm very impressed by the scope of Zephyr's size in comparison to my code, which takes up only 15%. (I know mcuboot cut half of my size)

RE: Zephyr use lot of memory for unused fonction

Charlie — Mon, 19 Aug 2024 10:22:20 GMT

Hi Fabien,

The percentage of zephyr memory usage depends on two factors. The first one is your chip memory size and the second is the libraries used by your application from Zephyr projects.

Memory footprint optimization (nordicsemi.com)

(+) Memory Optimization with the nRF Connect SDK - Software - nRF Connect SDK guides - Nordic DevZone (nordicsemi.com)

You can refer to above pages to do memory footprint optimizing. Make use the unused libraries are not checked in the configuration files. Otherwise, you have to consider switch to chips with bigger memory size.

Best regards,

Charlie