Pinmux Driver Sample Application

Description

The Pinmux Driver sample application demonstrates how to configure SR110 pins for the required electrical and functional characteristics.

In simple terms, the sample shows how to tell a pin:

  • what role to perform (for example, SPI/UART/GPIO function selection), and

  • how to configure electrical parameters (drive strength, input enable, hold, pull-up/pull-down, slew rate, Schmitt trigger).

The app verifies key Pinmux APIs by:

  • Setting and reading back full electrical configuration for a pin.

  • Setting and reading back individual electrical parameters.

  • Setting and reading back pin function mapping.

  • Applying combined function + electrical config for one pin.

  • Applying combined function + electrical config for multiple pins.

Each step prints status through logger so users can confirm configuration calls succeeded.

Prerequisites

Building and Flashing the Example using VS Code

Use the VS Code flow described in the SR110 guide and the VS Code Extension guide:

Build (VS Code):

  1. Open Build and Deploy -> Build Configurations.

  2. Select pinmux_sample_app in the Application dropdown.

  3. Build with Build (SDK + App) for the first build, or Build App for rebuilds.

Flash (VS Code):

  1. Use Image Conversion to generate the flash image.

  2. Use Image Flashing (SWD/JTAG) to flash the firmware image.

Building and Flashing the Example using CLI

Use the CLI flow described in the SR110 guide:

Build (CLI):

  1. From <sdk-root>/examples, build the example:

    cd <sdk-root>/examples
export SRSDK_DIR=<sdk-root>
make cm55_pinmux_sample_app_defconfig BOARD=SR110_RDK BUILD=SRSDK

Flash (CLI):

  1. Activate the SDK venv (required for image generation tools):

    # Linux/macOS
source <sdk-root>/.venv/bin/activate
# Windows PowerShell
.\.venv\Scripts\Activate.ps1

  2. Generate the flash image:

    cd <sdk-root>/tools/srsdk_image_generator
python srsdk_image_generator.py \
  -B0 \
  -flash_image \
  -sdk_secured \
  -spk "<sdk-root>/tools/srsdk_image_generator/B0_Input_examples/spk_rc4_1_0_secure_otpk.bin" \
  -apbl "<sdk-root>/tools/srsdk_image_generator/B0_Input_examples/sr100_b0_bootloader_ver_0x012F_ASIC.axf" \
  -m55_image "<sdk-root>/examples/out/sr110_cm55_fw/release/sr110_cm55_fw.elf" \
  -flash_type "GD25LE128" \
  -flash_freq "67"

  3. Flash the firmware image:

    cd <sdk-root>
python tools/openocd/scripts/flash_xspi_tcl.py \
  --cfg_path tools/openocd/configs/sr110_m55.cfg \
  --image tools/srsdk_image_generator/Output/B0_Flash/B0_flash_full_image_GD25LE128_67Mhz_secured.bin \
  --erase-all

Running the Application using VS Code Extension

  1. Press RESET on the board after flashing.

  2. For logging output, click SERIAL MONITOR and connect to the DAP logger port on J14.

    • To make it easier to identify, ensure only J14 is plugged in (not J13).

    • The logger port is not guaranteed to be consistent across OSes. As a starting point:

      • Windows: try the lower-numbered J14 COM port first.

      • Linux/macOS: try the higher-numbered J14 port first.

    • If you do not see logs after a reset, switch to the other J14 port.

  3. Pinmux sample logs appear in the logger window, including pass/fail status for pin function and electrical configuration checks.

Expected Logs

0391469361:[0][WRN][LOGR]:Changing logger interface to LOGGER_IF_UART_1
0000000023:[0][INF][SYS ]:Application drivers initialization complete without errors.
0000004205:[0][INF][SYS ]:sr110 SDK version 1.3.0
0000006674:[0][INF][PMUX]:Pinmux set pin electrical characteristics test start
0000010516:[0][INF][PMUX]:Drive strength: 0, Enable_input: 1, Enable_hold :0, Pull_state:0, slew_rate:1, schmitt_trigger:0
0000016467:[0][INF][PMUX]:Pinmux set pin electrical characteristics test end
0000020203:[0][INF][PMUX]:Pinmux set pin electrical parameter test start
0000023759:[0][INF][PMUX]:Driver strength: 3
0000025980:[0][INF][PMUX]:input enable: 1
0000028053:[0][INF][PMUX]:Hold enable: 1
0000030082:[0][INF][PMUX]:pull state: 0
0000032059:[0][INF][PMUX]:slew rate: 0
0000033993:[0][INF][PMUX]:schmitt trigger: 1
0000036207:[0][INF][PMUX]:Pinmux set pin electrical parameter test end
0000039665:[0][INF][PMUX]:Pinmux set pin function test start
0000042647:[0][INF][PMUX]:Pin function: 1
0000044722:[0][INF][PMUX]:Pinmux set pin function test end
0000047608:[0][INF][PMUX]:Pinmux configuring both electrical characteristics and function for a pin is successful
0000053121:[0][INF][PMUX]:Pinmux configuring both electrical characteristics and function for multiple pins is successful
0000059020:[0][INF][PMUX]:All Pinmux Driver APIs functionalities are verified successfully!