ESP32-H2

Boots real bare-metal ESP32-H2 firmware on a from-scratch RISC-V RV32IMAC interpreter (the RV32I base plus M multiply/divide, A atomics and C compressed, the machine-mode CSRs, traps and a functional interrupt controller) wired to an ESP32-H2 SoC model at the real hardware addresses: 320 KB unified HP SRAM (0x40800000), XIP flash at 0x42000000, the GPIO block (0x60091000, with the on-board WS2812 RGB LED on GPIO8), UART0 (0x60000000) and the systimer. The default cycles the DevKitM-1 WS2812 RGB LED as a real 800 kHz one-wire waveform, decoded from the GPIO edge timing. Also in the picker: a Rainbow hue wheel, an interactive UART mini-REPL (type print(2+2) to get 4, 6*7 for 42, or led red / led green / led blue / led off to drive the LED) and Hello UART. Open the debugger to single-step the RISC-V core, read/write x0-x31 + pc + the machine CSRs, disassemble HP SRAM and flash with the shared RISC-V decoder, and set breakpoints and write-watchpoints over the real ESP32-H2 memory map. Bluetooth LE and 802.15.4 (Thread / Zigbee) have no radio here — their register windows are HLE stubs so firmware that probes them keeps running; the H2 has no WiFi. On-board only, and the devkit is silent.

Boots real bare-metal ESP32-H2 firmware on a from-scratch RISC-V RV32IMAC interpreter (the RV32I base plus M multiply/divide, A atomics and C compressed, the machine-mode CSRs, traps and a functional interrupt controller) wired to an ESP32-H2 SoC model at the real hardware addresses: 320 KB unified HP SRAM (0x40800000), XIP flash at 0x42000000, the GPIO block (0x60091000, with the on-board WS2812 RGB LED on GPIO8), UART0 (0x60000000) and the systimer. The default cycles the DevKitM-1 WS2812 RGB LED as a real 800 kHz one-wire waveform, decoded from the GPIO edge timing. Also in the picker: a Rainbow hue wheel, an interactive UART mini-REPL (type print(2+2) to get 4, 6*7 for 42, or led red / led green / led blue / led off to drive the LED) and Hello UART. Open the debugger to single-step the RISC-V core, read/write x0-x31 + pc + the machine CSRs, disassemble HP SRAM and flash with the shared RISC-V decoder, and set breakpoints and write-watchpoints over the real ESP32-H2 memory map. Bluetooth LE and 802.15.4 (Thread / Zigbee) have no radio here — their register windows are HLE stubs so firmware that probes them keeps running; the H2 has no WiFi. On-board only, and the devkit is silent.

Boots real bare-metal ESP32-H2 firmware on a from-scratch RISC-V RV32IMAC interpreter (the RV32I base plus M multiply/divide, A atomics and C compressed, the machine-mode CSRs, traps and a functional interrupt controller) wired to an ESP32-H2 SoC model at the real hardware addresses: 320 KB unified HP SRAM (0x40800000), XIP flash at 0x42000000, the GPIO block (0x60091000, with the on-board WS2812 RGB LED on GPIO8), UART0 (0x60000000) and the systimer. The default cycles the DevKitM-1 WS2812 RGB LED as a real 800 kHz one-wire waveform, decoded from the GPIO edge timing. Also in the picker: a Rainbow hue wheel, an interactive UART mini-REPL (type print(2+2) to get 4, 6*7 for 42, or led red / led green / led blue / led off to drive the LED) and Hello UART. Open the debugger to single-step the RISC-V core, read/write x0-x31 + pc + the machine CSRs, disassemble HP SRAM and flash with the shared RISC-V decoder, and set breakpoints and write-watchpoints over the real ESP32-H2 memory map. Bluetooth LE and 802.15.4 (Thread / Zigbee) have no radio here — their register windows are HLE stubs so firmware that probes them keeps running; the H2 has no WiFi. On-board only, and the devkit is silent.

Boots real bare-metal ESP32-H2 firmware on a from-scratch RISC-V RV32IMAC interpreter (the RV32I base plus M multiply/divide, A atomics and C compressed, the machine-mode CSRs, traps and a functional interrupt controller) wired to an ESP32-H2 SoC model at the real hardware addresses: 320 KB unified HP SRAM (0x40800000), XIP flash at 0x42000000, the GPIO block (0x60091000, with the on-board WS2812 RGB LED on GPIO8), UART0 (0x60000000) and the systimer. The default cycles the DevKitM-1 WS2812 RGB LED as a real 800 kHz one-wire waveform, decoded from the GPIO edge timing. Also in the picker: a Rainbow hue wheel, an interactive UART mini-REPL (type print(2+2) to get 4, 6*7 for 42, or led red / led green / led blue / led off to drive the LED) and Hello UART. Open the debugger to single-step the RISC-V core, read/write x0-x31 + pc + the machine CSRs, disassemble HP SRAM and flash with the shared RISC-V decoder, and set breakpoints and write-watchpoints over the real ESP32-H2 memory map. Bluetooth LE and 802.15.4 (Thread / Zigbee) have no radio here — their register windows are HLE stubs so firmware that probes them keeps running; the H2 has no WiFi. On-board only, and the devkit is silent.