WiSeConnect 3 - SiWx91x Platform SDK Version 3.5.1 (July 23 2025) - Release Notes#

Wi-Fi 6 + BLE (WiSeConnect 3) SDK Version 3.5.1

Simplicity SDK Version 2025.6.1

The SiWx91x Platform software development kit (SDK) provides platform features on Silicon Labs SiWx91x microcontrollers, including peripherals, drivers, and services.

Click here for earlier releases.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

Added in 3.5.1#

  • Driver support for Sensor Data Controller (SDC) peripheral.

  • Additional driver features for following peripherals

    • Configurable Timers (CT)

    • Brown Out Detection (BOD) Button

    • Operational Amplifier (OPAMP).

  • Driver support for Power Manager states in Tickless Idle

    • PS1 state

    • Standby state.

Added in 3.5.0#

  • Driver support for BOD, GPDMA, HSPI Secondary, and OPAMP peripherals

  • Additional driver features for existing peripherals

  • Sleep stability improvements

API Changes#

Added in 3.5.1#

  • APIs for newly introduced peripherals and new features:

    • SDC

    • BOD Button

    • OPAMP (3 features).

  • Power Manager states in Tickless Idle

    • PS1 state

    • Standby state.

Added in 3.5.0#

  • APIs for newly introduced peripherals

  • Low-power GPIO interrupt API changes with deprecation

Bug Fixes#

Fixed in 3.5.1#

  • Known issues from WiSeConnect 3 SDK release: v3.5.0 on BOD and Configurable Timers.

  • Issues on I2S and Power Manager peripherals.

Fixed in 3.5.0#

  • Stability and functional fixes for DMA, QEI, SSI, and RHT sensors

  • Configuration fixes for PSRAM, ULP I2S, and PWM

Chip Enablement#

Added in 3.5.1#

None

Added in 3.5.0#

None

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

Note: See Feature Matrix for a list of any appliable APIs, examples, software variants, modes, hardware, and host interfaces applicable for each feature.

New Features#

Added in 3.5.1#

  • Added support for Button feature on BOD.

  • Added support for DMA and Input Capture Events on Configurable Timers.

  • Implemented driver support for new peripherals and additional features from existing peripherals:

    • Sensor Data Controller (SDC)

    • Operational Amplifier (OPAMP) - 3 features

      • Cascaded Inverting PGA

      • Cascaded Non-inverting PGA

      • Two OPAMPs Differential Amplifier.

  • Added support for Power Manager states in Tickless Idle

    • PS1 state

    • Standby state.

Added in 3.5.0#

  • Added support for LittleFS on common flash devices.

  • Added support for GCC link-time optimization (LTO).

  • Implemented driver support for new peripherals:

    • Brown-Out Detection (BOD)

    • General Purpose Direct Memory Access (GPDMA)

    • High-speed Peripheral Interface (HSPI) Secondary

    • Operational Amplifier (OPAMP)

  • Added support for an alternative way to reset the SiWx91x device after an application processor firmware update in ISP mode.

Enhancements#

Added in 3.5.1#

  • Added Pin Tool support for the OPAMP peripheral.

Added in 3.5.0#

  • Enhanced driver support for existing peripherals:

    • Inter-IC Sound (I2S) Pulse Code Modulation (PCM)

    • Universal Asynchronous Receiver/Transmitter (UART) RS485

  • Added Pin Tool support for SoC ULP peripherals on SoC high-power (HP) GPIO pins and vice versa.

  • Added an initial check in the connectivity (network processor) firmware for the anti-rollback feature before initiating the firmware download.

  • Enhanced peripheral drivers for configuring the ULP peripheral on SoC high-power (HP) GPIO pins and vice versa.

  • Adding support for overriding the default Calendar callback handler with a custom implementation.

  • Introduced new APIs in GPIO driver to ensure consistency in the configuration of UULP GPIO pins.

  • Added I/O Stream support for multiple stream types, including RTT, SWO, Debug, and VUART.

  • Enhanced the ULP UART peripheral with support for hardware flow control and 9-bit data mode.

  • Added a new PM PS2 Component to the Power Manager, enabling execution of required files from RAM and providing PS2 power state-specific features and dependencies.

  • Implemented the 32 KHz RC calibration framework for both the Calendar and deep sleep timer peripherals.

  • Improvements made in the stability of the sleep/wake-up sequence, by fixing a lock-up issue on cold boot.

Removed Features#

Removed in 3.5.1#

None

Removed in 3.5.0#

Removed Feature

Was Deprecated?

Capacitive Touch Sensor (CTS)

No

32-bit mode in Config Timer

No

Support in I2S peripheral for 12-bit and 20-bit resolutions

No

Deprecated Features#

Deprecated in 3.5.1#

None

Deprecated in 3.5.0#

Note: The Watchdog Manager service replaces the Watchdog Timer peripheral mentioned below. See Impact Statements.

Deprecated Feature

Planned Removal Date

Watchdog Timer peripheral

2026-12

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

Added in 3.5.1#

New API Signature

Deprecated API replaced by this (if any)

sl_status_t sl_si91x_power_manager_request_ps1_state(void)

None

sl_status_t sl_si91x_power_manager_remove_ps1_state_request(void)

None

bool sl_si91x_power_manager_get_ps1_state_status(void)

None

sl_status_t sl_si91x_power_manager_request_standby_state(void)

None

sl_status_t sl_si91x_power_manager_remove_standby_state_request(void)

None

bool sl_si91x_power_manager_get_standby_state_status(void)

None

sl_status_t sl_si91x_ssi_command_config(sl_ssi_handle_t ssi_handle, sl_ssi_inst_len_t inst_len, sl_ssi_addr_len_t addr_len, sl_ssi_frf_t spi_frf, sl_ssi_xfer_type_t xfer_type)

None

sl_status_t sl_si91x_ssi_receive_command_data(sl_ssi_handle_t ssi_handle, void *data, uint32_t data_length, uint8_t instruction, uint32_t address, uint8_t wait_cycles)

None

sl_status_t sl_si91x_ssi_send_command_data(sl_ssi_handle_t ssi_handle, void *data, uint32_t data_length, uint8_t instruction, uint32_t address)

None

sl_status_t sl_si91x_ssi_set_frame_length(sl_ssi_handle_t ssi_handle, uint8_t frame_length)

None

sl_status_t sl_si91x_config_timer_set_dma_configuration(uint32_t *compare_values, uint32_t channel)

None

sl_status_t sl_si91x_config_timer_dma_transfer(uint32_t *compare_values, uint32_t channel, sl_dma_xfer_t *dma_transfer)

None

sl_status_t sl_si91x_config_timer_dma_deinit(uint32_t channel)

None

sl_status_t sl_si91x_bod_button_wakeup_enable_v2(boolean_t bod_button_enable)

void sl_si91x_bod_button_wakeup_enable(uint8_t enable)

sl_status_t sl_si91x_bod_button_wakeup_disable(void)

None

void sl_si91x_bod_button_enable_interrupt(void)

None

void sl_si91x_bod_button_disable_interrupt(void)

None

void sl_si91x_bod_button_value_read(void)

None

void sl_si91x_bod_button_clear_interrupt(void)

None

void sl_si91x_bod_button_set_configuration(sl_bod_button_uc_config_param_t uc_config_param, uint8_t *button_max_value, uint8_t *button_1_min_value, uint8_t *button_2_min_value, uint8_t *button_3_min_value)

None

sl_status_t sl_si91x_sdc_driver_init(float vref)

None

sl_status_t sl_si91x_sdc_driver_deinit(void)

None

sl_status_t sl_si91x_sdc_driver_config(sl_si91x_sdc_config_t *sl_sdc_config)

None

sl_status_t sl_si91x_sdc_driver_channel_config(sl_si91x_sdc_adc_config_t *pin_config, sl_si91x_sdc_channel_info_t *sdc_channel_config, sl_si91x_sdc_channel_misc_config_t *misc_config)

None

sl_status_t sl_si91x_sdc_driver_register_callback(sl_sdc_callback_t callback_event)

None

sl_status_t sl_si91x_sdc_driver_unregister_callback(void)

None

sl_status_t sl_si91x_sdc_driver_read_data_start(void)

None

sl_status_t sl_si91x_sdc_driver_stop(void)

None

sl_status_t sl_si91x_sdc_driver_store_data(void)

None

sl_status_t sl_si91x_sdc_driver_read_data(uint32_t channel, int16_t *buffer, uint8_t length)

None

float sl_si91x_adc_get_chip_voltage(void)

None

Added in 3.5.0#

New API Signature

Deprecated API replaced by this (if any)

sl_status_t sl_si91x_gpio_driver_mask_set_uulp_npss_interrupt(uint8_t npssgpio_interrupt)

sl_si91x_gpio_driver_mask_uulp_npss_interrupt

sl_status_t sl_si91x_gpio_driver_mask_clear_uulp_npss_interrupt(uint8_t npssgpio_interrupt)

sl_si91x_gpio_driver_unmask_uulp_npss_interrupt

sl_status_t sl_si91x_gpio_driver_clear_uulp_npss_interrupt(uint8_t npssgpio_interrupt)

sl_si91x_gpio_driver_clear_uulp_interrupt

void sl_si91x_bod_unregister_callback(void)

None

sl_status_t sl_si91x_bod_get_battery_status(float *battery_status)

None

sl_status_t sl_si91x_bod_set_threshold(float threshold)

None

void sl_si91x_bod_enable_interrupt(void)

None

void sl_si91x_bod_disable_interrupt(void)

None

void sl_si91x_bod_clear_interrupt(void)

None

sl_status_t sl_si91x_bod_battery_percentage(float voltage, float *vbat_per)

None

void sl_si91x_bod_black_out_reset(en_t enable)

None

void sl_si91x_bod_button_interrupt_clear(void)

None

void sl_si91x_bod_enable_blackout_in_sleep_mode(void)

None

void sl_si91x_bod_disable_blackout_in_sleep_mode(void)

None

sl_status_t sl_si91x_uart_rs485_init(usart_peripheral_t uart_instance)

None

sl_status_t sl_si91x_uart_rs485_set_configuration(usart_peripheral_t uart_instance)

None

void sl_si91x_get_uart_rs485_configure(usart_rs485_config_t *uart_rs485_configs)

None

sl_status_t sl_si91x_uart_rs485_de_enable(usart_peripheral_t uart_instance, bool enable)

None

sl_status_t sl_si91x_uart_rs485_re_enable(usart_peripheral_t uart_instance, bool enable)

None

sl_status_t sl_si91x_uart_rs485_transfer_hardware_address(usart_peripheral_t uart_instance, uint8_t *tx_address)

None

sl_status_t sl_si91x_uart_rs485_address_received(usart_peripheral_t uart_instance)

None

sl_status_t sl_si91x_uart_rs485_rx_hardware_address_set(usart_peripheral_t uart_instance, uint8_t *rx_addr)

None

sl_status_t sl_si91x_uart_rs485_resume_tx(usart_peripheral_t uart_instance, bool enable)

None

sl_status_t sl_si91x_uart_rs485_control_send_address(usart_peripheral_t uart_instance, bool send_addr_ctrl)

None

sl_status_t sl_si91x_uart_rs485_control_address_match(usart_peripheral_t uart_instance, bool addr_match_ctrl)

None

void sl_si91x_ssi_per_instance_unregister_event_callback(sl_ssi_handle_t ssi_handle)

None

sl_status_t sl_si91x_opamp_init(void)

None

void sl_si91x_opamp_deinit(void)

None

sl_status_t sl_si91x_opamp_pin_init(sl_opamp_pin_config_t *opamp_config_ptr)

None

sl_status_t sl_si91x_opamp_set_configuration(sl_opamp_config_t *opamp_config)

None

sl_status_t sl_si91x_gpdma_init(void)

None

sl_status_t sl_si91x_gpdma_allocate_channel(uint32_t *channel_no, uint32_t priority, uint32_t max_transfer_size)

None

sl_status_t sl_si91x_gpdma_deallocate_channel(uint32_t channel_no)

None

sl_status_t sl_si91x_gpdma_register_callbacks(uint32_t channel_no, sl_gpdma_callback_pointer_t *callback_t)

None

sl_status_t sl_si91x_gpdma_unregister_callbacks(uint32_t channel_no, uint8_t callback_type)

None

sl_status_t sl_si91x_gpdma_transfer(uint32_t channel, void *src, void *dest)

None

sl_status_t sl_si91x_gpdma_stop_transfer(uint32_t channel_no)

None

sl_status_t sl_si91x_gpdma_allocate_descriptor(sl_si91x_gpdma_descriptor_t *pDesc_memory, uint32_t transfer_size, uint32_t channel_number)

None

sl_status_t sl_Si91x_gpdma_deallocate_descriptor(uint32_t channel_number)

None

sl_status_t sl_si91x_gpdma_build_descriptor(sl_si91x_gpdma_descriptor_t *pDescriptor_memory, sl_si91x_gpdma_descriptor_config_t *pDesc_config, uint32_t transfer_size, uint32_t channel_number)

None

sl_status_t sl_si91x_gpdma_allocate_fifo(uint32_t channel_no, uint32_t fifo_size)

None

sl_status_t sl_si91x_get_channel_fifo_size(uint32_t channel_no, uint32_t *fifo_size)

None

sl_status_t sl_si91x_gpdma_get_channel_status(uint32_t channel_number)

None

sl_status_t sl_si91x_button_deinit(const sl_button_t *handle)

None

sl_status_t sl_si91x_gpio_driver_set_soc_peri_on_ulp_pin_mode(sl_gpio_t *gpio, sl_gpio_mode_t mode)

None

sl_status_t sl_si91x_gpio_driver_set_ulp_peri_on_soc_pin_mode(sl_gpio_t *gpio, sl_gpio_mode_t mode)

None

sl_status_t sl_si91x_hspi_secondary_init(void)

None

sl_status_t sl_si91x_hspi_secondary_send_non_blocking(void *data_buf)

None

sl_status_t sl_si91x_hspi_secondary_receive_non_blocking(void *data_buf)

None

uint32_t sl_si91x_hspi_secondary_send_blocking(const void *data)

None

uint32_t sl_si91x_hspi_secondary_receive_blocking(void *data)

None

sl_status_t sl_si91x_hspi_secondary_register_event_callback(sl_hspi_secondary_callback_t callback_event)

None

void sl_si91x_hspi_secondary_unregister_event_callback(uint32_t flag)

None

sl_hspi_secondary_version_t sl_si91x_hspi_secondary_get_version(void)

None

Modified APIs#

Modified in 3.5.1#

None

Modified in 3.5.0#

None

Removed APIs#

Removed in 3.5.1#

None

Removed in 3.5.0#

None

Deprecated APIs#

Deprecated in 3.5.1#

Deprecated API Name

Planned Removal Date

void sl_si91x_bod_button_wakeup_enable(uint8_t enable)

2026-12

void sl_si91x_bod_NVIC_enable_irq(void)

2026-12

Deprecated in 3.5.0#

Deprecated API Name

Planned Removal Date

sl_si91x_gpio_driver_mask_uulp_npss_interrupt

2026-12

sl_si91x_gpio_driver_unmask_uulp_npss_interrupt

2026-12

sl_si91x_gpio_driver_clear_uulp_interrupt

2026-12

sl_si91x_button_state_get

2026-12

sl_si91x_button_pin_state

2026-12

sl_si91x_button_state_toggle

2026-12

sl_si91x_button_state_set

2026-12

sl_si91x_rgb_led_init

2026-12

sl_si91x_rgb_led_on

2026-12

sl_si91x_rgb_led_off

2026-12

sl_si91x_rgb_led_get_current_state

2026-12

sl_si91x_rgb_led_toggle

2026-12

Bug Fixes#

Fixed in 3.5.1#

Note: See the Feature Matrix section for a list of all hardware parts that work with the WiSeConnect 3 SDK.

ID Issue Description GitHub / Salesforce Reference (if any) Affected Software Variants, Hardware, Modes, Host Interfaces
1357680 Resolved compilation errors that occurred when the `-Xlinker --gc-sections` option was disabled in Simplicity Studio. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1215537 Resolved an issue where DMA functionality was not operational in the Configurable Timers. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1271727 Resolved an issue in the "Si91x - SL_POWER_MANAGER_M4_WIRELESS" example where, after transitioning from power state PS1 to PS2, subsequent transitions would not occur on BTN0 press. This behavior was observed after several iterations. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1413151 Resolved an issue where GSPI data comparison would fail when "Swap Write" was enabled, "Swap Read" was disabled, and DMA was enabled. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1455245 Blackout reset fails to occur on module board SiW917Y-RB4343A Rev. A07. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1437906 According to the HRM for BOD, the minimum threshold voltage is 1.75 V, but the hardware triggers an interrupt at 1.9 V or below. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1438016 BOD does not function in ULP power state PS2. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1454645 Resolved an issue where the ULP_I2S_SCLK and ULP_I2S_WSCLK Pin Tool configurations were missing for the ULP_PCM instance in I2S_PCM examples. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1455219 Resolved build errors that occurred when configuring 24-bit and 32-bit resolutions in I2S_PCM examples. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1441000 Resolved an issue where power consumption was higher than in previous builds by updating the ULP reference clock during system initialization when reading temperature from the on-board sensor. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A

Fixed in 3.5.0#

ID Issue Description GitHub / Salesforce Reference (if any) Affected Software Variants, Hardware, Modes, Host Interfaces
1436051 Issue in DMA de-init API with improper de-allocation of DMA channels. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1424712 Corrected the DMA transfer count in the ADC driver to use only the sample length value. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1414543 PSRAM device configuration files do not reflect the installed PSRAM device components. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1406552 ULP I2S component UC configuration is missing the GPIOs specified in the SiWG917 data sheet v1.0. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1379979 Addressed potential manual errors in PWM configuration by enforcing a build error if "All channels" is selected for the base timer without a `channel_0` instance. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1413169 Hard fault occurs in QEI de-init API due to a `NULL` pointer access, causing the program to enter the default handler. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1430079 QEI index and position values fail to reset in the QEI de-init API. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1448261 Eliminated the dependency on the FreeRTOS configuration file from the platform code. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1445491 Un-registering a single SSI instance in the SSI un-register callback results in all instances being un-registered, rather than just the specified SSI instance. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1401741 RHT sensor "No Hold Master" mode for temperature and humidity measurement does not work, and the API returns an error code. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1416569 Button 1 does not work after sleep due to the GPIO driver not re-initializing. This issue was fixed by adding the sl_si91x_button_deinit API to allow proper de-initialization and re-initialization of the button after sleep. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1435484 Sleep/wakeup failures occur when SDIO is used with both application processor and network processor set to power save mode with RAM retention. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1339252 Lack of thread safety in malloc leads to infinite loops during multi-threaded execution. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC, NCP.
  • Host interfaces: SPI, UART
1424184 Added validation in the ADC init API to ensure that the number of channels selected in the common configuration matches the number of channels/instances added. None
  • Firmware variants: Standard and Lite
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A

Chip Enablement#

Added in 3.5.1#

None

Added in 3.5.0#

None

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

Note: See the Feature Matrix section for a list of all hardware parts that work with the WiSeConnect 3 SDK.

New Examples#

Added in 3.5.1#

Example Name Description Supported Software Variants (if applicable) Supported Modes Supported OPNs / Boards / OPN Combinations Supported Host Interfaces

SL Si91x - BOD Button

See README

 Demonstrates how to use the BOD feature to monitor button voltages on the `VBAT_UULP_GPIO_2 (F12)` pin. Users can configure voltage ranges for each button in `sl_si91x_bod.c`. When a button's voltage enters its defined range, a BOD interrupt is triggered. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - SDC

See README

 Demonstrates how to configure and use the Sensor Data Controller (SDC) peripheral on the SiWx917 SoC device. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

Added in 3.5.0#

Example Name Description Supported Software Variants (if applicable) Supported Modes Supported OPNs / Boards / OPN Combinations Supported Host Interfaces

SL Si91x - BOD

See README

 Demonstrates the configuration of the threshold value for BOD and monitoring the voltage levels on VMCU. When the voltage drops below the configured threshold, a BOD interrupt is triggered, and the application handles the event accordingly. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - UART RS485

See README

 Demonstrates the configuration of UART0/1 to use in RS485 multidrop mode and to send and receive data. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - OPAMP

See README

 Demonstrates the initialization, configuration, and operation of the OPAMP peripheral by giving input on the non-inverting terminal and inverting terminal of the OPAMP and checking the output. This application example configures the OPAMP instances for various use cases, including integration with DAC for external voltage comparison. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - GPDMA

See README

 Demonstrates memory-to-memory DMA transfers of various sizes. Users can change the DMA transfer size by updating TRANSFER_LENGTH. This application example performs a generic DMA transfer using either a pre-defined configuration or a user-defined descriptor. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - HSPI Secondary

See README

 Demonstrates the SoC clock configuration and HSPI secondary initialization with GPDMA, ensuring smooth communication with the SPI primary and efficient callback management for HSPI operations. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - PCM Loopback

See README

 Demonstrates the PCM loopback functionality. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - PCM Primary

See README

 Demonstrates the PCM primary device data transfer using the I2S interface. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - PCM Secondary

See README

 Demonstrates the PCM secondary device transfer using the I2S interface. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

Modified Examples#

Modified in 3.5.1#

Example Name Changes Supported Software Variants if applicable Supported Modes Supported OPNs / Boards / OPN Combinations Supported Host Interfaces

SL Si91x - Config Timer

See README

 Added capability to demonstrate DMA and Input Capture Events. Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

SL Si91x - Power Manager Tickless Idle

See README

 Added demonstration for Power Manager states in Tickless Idle (PS1 state & Standby state). Standard and Lite

SoC
  • OPNs: All
  • Boards: All

N/A

Modified in 3.5.0#

Example Name Changes Supported Software Variants if applicable Supported Modes Supported OPNs / Boards / OPN Combinations Supported Host Interfaces

SL Si91x - RTOS Message Queue

See README

 Updated with I2C driver code for data communication. Standard and Lite

SoC

  • OPNs: All
  • Boards: All

N/A

SL Si91x - Config Timer

See README

 Initialized a local variable to prevent un-intended output. Standard and Lite

SoC

  • OPNs: All
  • Boards: All

N/A

Removed Examples#

Removed in 3.5.1#

None

Removed in 3.5.0#

Removed Example Name

Was Deprecated?

Si91x - CPC SDIO Secondary FreeRTOS with Security

No

Deprecated Examples#

Deprecated in 3.5.1#

None

Deprecated in 3.5.0#

None

Known Issues and Limitations#

Note: See the Feature Matrix section for a list of all hardware parts that work with the WiSeConnect 3 SDK.

Added in 3.5.1#

ID Issue or Limitation Description GitHub / Salesforce Reference (if any) Workaround (if any) Affected Software Variants, Hardware, Modes, Host Interfaces
1417168 While mbedTLS components and SI91X-PSA driver components are visible in the Simplicity Studio GUI, the PSA components themselves are not displayed. This causes project compilation failures when security modules are manually added to the project. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1364360 For peripherals that support multiple instances, Simplicity Studio's "Add New Instance" feature suggests default instance names (e.g., inst0, inst1) which might differ from the instance names supported in the reference documentation and application examples. Users should refer to peripheral-specific documentation for the officially supported instance naming conventions. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1475668 In OPAMP, GPIO_27 as input and "Cascaded" feature for OPAMP2 with OPAMP3 are not supported. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1475241 SDC cannot be used with OPAMP as its input. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1482392 SDC is not functioning as expected when the "Sampling Threshold" parameter is configured to 16. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A The ULP Timer may experience timer drifts due to the inaccuracy of the clock source (RC oscillator). None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A FreeRTOS tick-less idle mode is currently not supported in the Sensor Hub example application. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A Only a few wakeup sources (ULP GPIO, ULP Timer, ULP ADC, ULP Comparator, ULP UART) are currently supported for the PS1 state in the Power Manager. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A Peripheral clock sources are currently fixed and cannot be configured by the user. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A GPDMA driver currently supports only memory-to-memory transfers. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A I2C receive operations using DMA may fail because the IC DATA CMD register must be programmed with a read command for each byte. Using two DMA channels—one for programming the register and one for data transfer—can lead to synchronization issues due to DMA flow control delays. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A

Known Issues and Limitations of 3.5.0#

ID Issue or Limitation Description GitHub / Salesforce Reference (if any) Workaround (if any) Affected Software Variants, Hardware, Modes, Host Interfaces
1455245 Blackout reset fails to occur on module board SiW917Y-RB4343A Rev. A07. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1437906 According to the HRM for BOD, the minimum threshold voltage is 1.75 V, but the hardware triggers an interrupt at 1.9 V or below. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1438016 BOD does not function in ULP power state PS2. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1417168 While mbedTLS components and SI91X-PSA driver components are visible in the Simplicity Studio GUI, the PSA components themselves are not displayed. This causes project compilation failures when security modules are manually added to the project. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
1364360 For peripherals that support multiple instances, Simplicity Studio's "Add New Instance" feature suggests default instance names (e.g., inst0, inst1) which might differ from the instance names supported in the reference documentation and application examples. Users should refer to peripheral-specific documentation for the officially supported instance naming conventions. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A The ULP Timer may experience timer drifts due to the inaccuracy of the clock source (RC oscillator). None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A FreeRTOS tick-less idle mode is currently not supported in the Sensor Hub example application. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A Only a few wakeup sources (ULP GPIO, ULP Timer, ULP ADC, ULP Comparator, ULP UART) are currently supported for the PS1 state in the Power Manager. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A Peripheral clock sources are currently fixed and cannot be configured by the user. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A
N/A GPDMA driver currently supports only memory-to-memory transfers. None None
  • OPNs: All
  • Boards: All
  • Modes: SoC
  • Host interfaces: N/A