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48 lines
2.0 KiB
Markdown
48 lines
2.0 KiB
Markdown
# Programming the RP2040
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To upload a new firmware image on the PR2040 (the "pico" part of "pico-ice"), you need to switch to that RP2040 UF2 bootloader mode instead of the FPGA UF2 mode.
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You can do that by connecting a jumper between the `BT` pin a `Gnd` pin, then press the `RESET` button:
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1. Connect the `USB_BOOT` pin to ground. For instance with a pair of tweezers, a jumper, or an uncoated paper clip.
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2. Press and release the "RESET" button. The RP2040 now bypasses its firmware, and runs the RP2040 factory bootloader (from internal ROM) instead.
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3. Disconnect the `USB_BOOT` pin from ground.
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4. Look for an USB drive named `RPI-RP2` and mount it, open it, and check that there are only 2 files in it: `INFO.HTML` and `INFO_UF2.TXT`.
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If you also have an `CURRENT.UF2`, this means you found the FPGA flashing interface, and need to retry steps 1 and 2.
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5. Copy the `.uf2` firmware file onto the USB drive.
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6. Eject the USB drive.
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At this step, the firmware should be uploaded and running.
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Since version [`v1.6.1`](https://github.com/tinyvision-ai-inc/pico-ice/releases),
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it is possible to reboot the pico-ice into bootloader "BOOTSEL" mode without jumpers:
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picocom --baud 1200 /dev/ttyACM0
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This uses the [convention established by Arduino boards](https://arduino.github.io/arduino-cli/dev/platform-specification/#1200-bps-bootloader-reset)
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which reset into bootloader mode when connecting with baud 1200.
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After this, it becomes possible to use the [picotool](https://github.com/raspberrypi/picotool) to control the firmware (upload, check version, reboot):
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$ sudo picotool info
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Program Information
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name: pico_ice_default
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features: USB stdin / stdout
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## Troubleshooting
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### RPI-RP2 is still visible after step 6
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This means the device remained in "bootloader" mode.
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One thing to check is that the `USB_BOOT` pin (marked `BT` on the board) is not connected to anything anymore,
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then try to reset the board.
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