Zephyre BLE UART example reads wrong bytes ( Adafuit Feather nRF52840 )

RE: Zephyre BLE UART example reads wrong bytes ( Adafuit Feather nRF52840 )

Simonr — Mon, 04 Nov 2024 10:25:27 GMT

A couple suggestions:

As Susheel alreadt suggested, enable HWFC
Check the supply voltage of the GPS module and make sure it matches the operating conditions of the module's specifications.

Best regards,

Simon

RE: Zephyre BLE UART example reads wrong bytes ( Adafuit Feather nRF52840 )

TryingToTameNRF52 — Wed, 30 Oct 2024 18:13:04 GMT

Looks like it is a hardware problem on the GPS module side

Will try to figure out how to handle it

RE: Zephyre BLE UART example reads wrong bytes ( Adafuit Feather nRF52840 )

TryingToTameNRF52 — Tue, 29 Oct 2024 00:25:56 GMT

Hello,
HWFC was disabled.

UART1 related nodes:

  uart1: uart@40028000 {
   compatible = "nordic,nrf-uarte";
   reg = <0x40028000 0x1000>;
   interrupts = <40 1>;
   status = "disabled";
  };

uart1_default: uart1_default {
    group1 {
    psels = <((((((0) * 32U) + (2)) & 0x1FFU) << 0U) | ((0U & 0x7FFFU) << 17U))>,
    <((((((0) * 32U) + (3)) & 0x1FFU) << 0U) | ((1U & 0x7FFFU) << 17U))>;
    };
};

uart1_sleep: uart1_sleep {
 group1 {
 psels = <((((((0) * 32U) + (2)) & 0x1FFU) << 0U) | ((0U & 0x7FFFU) << 17U))>,
 <((((((0) * 32U) + (3)) & 0x1FFU) << 0U) | ((1U & 0x7FFFU) << 17U))>;
 low-power-enable;
 };
};

&uart1 {
        compatible = "nordic,nrf-uarte";
        current-speed = <115200>;
        status = "okay";
        pinctrl-0 = <&uart1_default>;
        pinctrl-1 = <&uart1_sleep>;
        pinctrl-names = "default", "sleep";
};

chosen {
  nordic,nus-uarte = &uart1;
};

The device:

static const struct device *uarte = DEVICE_DT_GET(DT_CHOSEN(nordic_nus_uarte));

I suspect it is a memory leak as I track number of calls for

k_malloc(sizeof(*buf)); // if (buf)

k_free(buf); // appears twice in the code

Difference between them should be number of buffers in use. The number of buffers in use rises to about 30 and after that the MCU starts calling: LOG_WRN("Not able to allocate UART receive buffer");

RE: Zephyre BLE UART example reads wrong bytes ( Adafuit Feather nRF52840 )

Susheel Nuguru — Mon, 28 Oct 2024 12:38:56 GMT

[quote user=""]After few minutes of running it starts leaking memory by not releasing RX buffers.[/quote]

Also, how did you come to a conclusion that this is a memory leak issue?

RE: Zephyre BLE UART example reads wrong bytes ( Adafuit Feather nRF52840 )

Susheel Nuguru — Mon, 28 Oct 2024 12:38:15 GMT

is HWFC enabled, can you show your UART settings in your device tree?

RE: Zephyre BLE UART example reads wrong bytes ( Adafuit Feather nRF52840 )

TryingToTameNRF52 — Sat, 26 Oct 2024 20:46:53 GMT

Forgot to add proj.conf

CONFIG_UART_ASYNC_API=y
CONFIG_NRFX_UARTE1=y
CONFIG_SERIAL=y
CONFIG_BT_NUS_UART_BUFFER_SIZE=240
CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
CONFIG_BT_BUF_ACL_RX_SIZE=251
CONFIG_BT_GATT_CLIENT=y
CONFIG_BT_ATT_PREPARE_COUNT=2
CONFIG_BT_CONN_TX_MAX=10
CONFIG_BT_L2CAP_TX_BUF_COUNT=10
CONFIG_BT_L2CAP_TX_MTU=247
CONFIG_BT_L2CAP_DYNAMIC_CHANNEL=y
CONFIG_BT_CTLR_PHY_2M=y
CONFIG_BT_CTLR_RX_BUFFERS=2
CONFIG_BT_BUF_ACL_TX_COUNT=10
CONFIG_BT_BUF_ACL_TX_SIZE=251
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
CONFIG_BT_NUS_UART_RX_WAIT_TIME=500
CONFIG_GDBSTUB=y
CONFIG_GPIO=y
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y
CONFIG_HEAP_MEM_POOL_SIZE=8192
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="Nordic_UART_Service"
CONFIG_BT_MAX_CONN=1
CONFIG_BT_MAX_PAIRED=1
CONFIG_BT_NUS=y
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
CONFIG_SETTINGS=y
CONFIG_DK_LIBRARY=y
CONFIG_MAIN_STACK_SIZE=1152
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_PRINTK=n
CONFIG_ASSERT=y