BBC micro:bit

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.

Runs real BBC micro:bit v1 programs on an in-browser Nordic nRF51822 (ARM Cortex-M0). The default is the STOCK MicroPython runtime (v1.1.1, MIT) booting a real Python program that pulses a heart on the 5x5 LED matrix — it boots because the core now has the full ARMv6-M exception model (NVIC, SysTick, SVC, PendSV) and the board raises the real nRF51 RTC/TIMER/GPIOTE interrupts. Pick "MicroPython: Scrolling Text" to scroll text, or "MicroPython: Smiley Buttons" and press A/B to switch faces. "Interrupt Heart" is a bare-metal program whose display is driven entirely from an RTC interrupt handler. The bare-metal "Flashing Heart / Smiley / Dice / Tilt" programs poll the hardware directly; Dice (Shake) and Tilt use the accelerometer over real TWI. A "MakeCode / CODAL" config boots a REAL MakeCode-compiled app through a clean-room Nordic SoftDevice HLE (the app at flash 0x18000 over the SoftDevice layout; Nordic's binary is NOT shipped — its sd_* SVC ABI is emulated in JS): the CODAL runtime boots, RENDERS the flashing heart on the 5x5 matrix (its LED refresh is driven by the real CODAL system-timer strobe on the TIMER1 us-ticker IRQ), and the debugger single-steps its real Thumb. ALL on-screen controls — A/B buttons, the tilt D-pad and Shake/Flat — live in ONE place: the shared debugger's Controller input panel (open it from the shell footer or the debugger). Keyboard: A/B = buttons, arrows = tilt, S = shake; click the display first so it captures the keyboard. Open the debugger, or add ?debug, to single-STEP real Thumb instructions (now through exception entry/return and SVC too), set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real nRF51 memory map live. micro:bit v1 has no on-board speaker, so it is honestly silent.