Uis8141e Firmware ✦ Complete

If version matches expected and no CRC errors appear in dmesg , flash is successful. | Symptom | Likely Cause | Solution | |---------|--------------|----------| | No /dev/video* | Wrong firmware for USB PID/VID | Reflash matching USB descriptor firmware | | Depth values all zero | Firmware missing calibration | Upload factory calibration (separate .cal file) | | Sensor resets repeatedly | SPI flash corruption | Erase flash, reflash, verify checksum | | I2C error after update | Bootloader stuck | Pull BOOT pin low for 2s during power-on | 7. Backup Current Firmware Before updating, always back up the existing firmware:

// Example I2C sequence (C pseudo-code) uint8_t fw_buf[128*1024]; FILE *fp = fopen("uis8141e_fw.bin", "rb"); fread(fw_buf, 1, sizeof(fw_buf), fp); // Enter firmware update mode i2c_write(0x42, 0x00, 0xA5); // unlock i2c_write(0x42, 0x01, 0x5A); // enter bootloader

# Dump SPI flash via I2C (if supported) python uis_dump.py --bus 1 --addr 0x42 --output backup_fw.bin Or using SPI programmer: uis8141e firmware

// Exit & restart i2c_write(0x42, 0x00, 0x00); // exit update mode After power cycling:

# 1. Connect module USB -> PC # 2. Identify I2C bus (usually 1 or 2) i2cdetect -y 1 # Should show device at 0x42 (UIS8141E I2C address) python flash_uis8141e.py --bus 1 --addr 0x42 --fw uis8141e_fw_v3.02.bin If version matches expected and no CRC errors

Erasing SPI flash... OK Writing firmware (128 KB)... OK Verifying checksum... OK Rebooting device... If you have direct access to the UIS8141E (not a module), use an ST-Link or J-Link to program the external SPI flash.

# If using V4L2 driver (UIS8141E appears as /dev/videoX) v4l2-ctl -d /dev/video0 --get-ctrl=firmware_version Connect module USB -> PC # 2

# Re-read firmware version v4l2-ctl -d /dev/video0 --get-ctrl=firmware_version v4l2-ctl -d /dev/video0 --stream-mmap --stream-count=100 --stream-to=/tmp/depth.raw

UIS8141E_fw_v3.02.bin UIS8141E_fw_v3.01_60fps.bin ⚠️ Do not mix firmware for UIS8141E (ToF) with UIS8141 (IR-only) – they are not interchangeable. Method A – Via USB (if module has onboard USB bridge) Most evaluation modules expose a USB port (FTDI or CH340). The flash is accessible over I2C via USB.

// Write firmware chunk by chunk (max 64 bytes per transaction) for (int addr = 0; addr < fw_size; addr += 64) i2c_write_block(0x42, 0x80 + (addr >> 8), &fw_buf[addr], 64);

This guide covers: obtaining firmware, flashing via USB/I2C, common version types, and debugging. Firmware for the UIS8141E is typically stored in an external SPI Flash (e.g., Winbond W25X40). The module identifies itself with a specific chip_id and firmware_version .