This demo application connects to Google Cloud IoT through MQTT and publishes messages.
It requires a registered device.
The following describes the various components and the configuration settings.
Once the application is configured you can:
- Build the application.
- Connect the debugger.
- Run the application and view messages in a debug printf or terminal window.
The file demo.c configures the connection to Google IoT with these settings:
PROJECT_ID: Project IDCLOUD_REGION: Cloud regionREGISTRY_ID: Registry IDDEVICE_ID: Device ID
Note: These settings need to be configured by the user!
The file pkey.h configures the device private key.
Note: The device private key needs to be provided by the user!
The real-time operating system Keil RTX5 implements the resource management.
It is configured with the following settings:
- Global Dynamic Memory size: 24000 bytes
- Default Thread Stack size: 3072 bytes
- Event Recorder Configuration
- Global Initialization: 1
- Start Recording: 1
- Global Initialization: 1
Refer to Configure RTX v5 for a detailed description of all configuration options.
This implementation uses an IoT socket layer that connects to a CMSIS-Driver Ethernet.
The IoT Socket is implemented using lwIP.
The tables below list the device configuration for this board. The board layer for the NXP IMXRT1050-EVKB is using the software component ::Board Support: SDK Project Template: project_template (Variant: evkbimxrt1050) from NXP.EVKB-IMXRT1050_BSP.13.1.0 pack.
The heap/stack setup and the CMSIS-Driver assignment is in configuration files of related software components.
The example project can be re-configured to work on custom hardware. Refer to "Configuring Example Projects with MCUXpresso Config Tools" for information.
| System Component | Setting |
|---|---|
| Device | MIMXRT1052DVL6B |
| Board | IMXRT1050-EVKB |
| SDK Version | ksdk2_0 |
| Heap | 64 kB (configured in linker script MIMXRT1052xxxxx_*.scf file) |
| Stack (MSP) | 1 kB (configured in linker script MIMXRT1052xxxxx_*.scf file) |
| Clock | Setting |
|---|---|
| AHB_CLK_ROOT | 600 MHz |
| IPG_CLK_ROOT | 150 MHz |
| PERCLK_CLK_ROOT | 75 MHz |
| USDHC1_CLK_ROOT | 198 MHz |
| UART_CLK_ROOT | 80 MHz |
| ENET_125M_CLK | 50 MHz |
| ENET_25M_REF_CLK | 25 MHz |
| ENET_TX_CLK | 50 MHz |
Note: configured with Functional Group: BOARD_BootClockRUN
| Functional Group | Pin | Peripheral | Signal | Identifier | Pin Settings | Usage |
|---|---|---|---|---|---|---|
| BOARD_InitDEBUG_UART | K14 | LPUART1 | TX | UART1_TXD | default | UART1 TX for debug console (GPIO_AD_B0_12) |
| BOARD_InitDEBUG_UART | L14 | LPUART1 | RX | UART1_RXD | default | UART1 RX for debug console (GPIO_AD_B0_13) |
| BOARD_InitENET | A7 | ENET | MDC | ENET_MDC | default | Ethernet KSZ8081RNB pin MDC (GPIO_EMC_40) |
| BOARD_InitENET | C7 | ENET | MDIO | ENET_MDIO | default | Ethernet KSZ8081RNB pin MDIO (GPIO_EMC_41) |
| BOARD_InitENET | B13 | ENET | REF_CLK | ENET_TX_CLK | default | Ethernet KSZ8081RNB pin XI (GPIO_B1_10) |
| BOARD_InitENET | E12 | ENET | RX_DATA, 0 | ENET_RXD0 | default | Ethernet KSZ8081RNB pin RXD0 (GPIO_B1_04) |
| BOARD_InitENET | D12 | ENET | RX_DATA, 1 | ENET_RXD1 | default | Ethernet KSZ8081RNB pin RXD1 (GPIO_B1_05) |
| BOARD_InitENET | C12 | ENET | RX_EN | ENET_CRS_DV | default | Ethernet KSZ8081RNB pin CRS_DV (GPIO_B1_06) |
| BOARD_InitENET | C13 | ENET | RX_ER | ENET_RXER | default | Ethernet KSZ8081RNB pin RXER (GPIO_B1_11) |
| BOARD_InitENET | B12 | ENET | TX_DATA, 0 | ENET_TXD0 | default | Ethernet KSZ8081RNB pin TXD0 (GPIO_B1_07) |
| BOARD_InitENET | A12 | ENET | TX_DATA, 1 | ENET_TXD1 | default | Ethernet KSZ8081RNB pin TXD1 (GPIO_B1_08) |
| BOARD_InitENET | A13 | ENET | TX_EN | ENET_TXEN | default | Ethernet KSZ8081RNB pin TXEN (GPIO_B1_09) |
| BOARD_InitUSDHC | J2 | USDHC1 | DATA, 3 | SD1_D3 | default | SD Card pin D3 (GPIO_SD_B0_05) |
| BOARD_InitUSDHC | H2 | USDHC1 | DATA, 2 | SD1_D2 | default | SD Card pin D2 (GPIO_SD_B0_04) |
| BOARD_InitUSDHC | K1 | USDHC1 | DATA, 1 | SD1_D1 | default | SD Card pin D1 (GPIO_SD_B0_03) |
| BOARD_InitUSDHC | J1 | USDHC1 | DATA, 0 | SD1_D0 | default | SD Card pin D0 (GPIO_SD_B0_02) |
| BOARD_InitUSDHC | J4 | USDHC1 | CMD | SD1_CMD | default | SD Card pin CMD (GPIO_SD_B0_00) |
| BOARD_InitUSDHC | J3 | USDHC1 | CLK | SD1_CLK | default | SD Card pin CLK (GPIO_SD_B0_01) |
| BOARD_InitARDUINO_UART | J12 | LPUART3 | TX | LPUART3_TX | default | Arduino UNO R3 pin D1 (GPIO_AD_B1_06) |
| BOARD_InitARDUINO_UART | K10 | LPUART3 | RX | LPUART3_RX | default | Arduino UNO R3 pin D0 (GPIO_AD_B1_07) |
| BOARD_InitUSER_LED | F14 | GPIO1 | gpio_io, 09 | USER_LED | Direction Output, GPIO initial state 1, mode PullUp | User LED (GPIO_AD_B0_09) |
| BOARD_InitUSER_BUTTON | L6 | GPIO5 | gpio_io, 00 | USER_BUTTON | Direction Input, mode PullUp | User Button SW8 (WAKEUP) |
| BOARD_InitI2C | J11 | LPI2C1 | SCL | I2C_SCL_FXOS8700CQ | Software Input On, Open drain | LPI2C1 for FXOS8700CQ (GPIO_AD_B1_00) |
| BOARD_InitI2C | K11 | LPI2C1 | SDA | I2C_SDA_FXOS8700CQ | Software Input On, Open drain | LPI2C1 for FXOS8700CQ (GPIO_AD_B1_01) |
| NVIC Interrupt | Priority |
|---|---|
| ENET | 8 |
| USDHC1 | 8 |
| LPUART3 | 8 |
STDIO is routed to debug console through Virtual COM port (DAP-Link, peripheral = LPUART1, baudrate = 115200)
| CMSIS-Driver | Peripheral |
|---|---|
| ETH_MAC0 | ENET |
| ETH_PHY0 | KSZ8081RNB (external) |
| MCI0 | USDHC1 |
| USART3 | LPUART3 |
| CMSIS-Driver VIO | Physical board hardware |
|---|---|
| vioBUTTON0 | User Button SW8 (WAKEUP) |
| vioLED0 | User LED (GPIO_AD_B0_09) |
| vioMotionAccelero | 3-Axis Accelerometer (FXOS8700CQ) |
| vioMotionMagneto | 3-Axis Magnetometer (FXOS8700CQ) |