Metro M4 Express

Runs real compiled Adafruit Metro M4 Express firmware on an in-browser Microchip SAMD51 (ARM Cortex-M4F, 120 MHz). The default "NeoPixel Rainbow" is a bare-metal C program that cycles a smooth rainbow on the single on-board WS2812 NeoPixel (PB22), blinks the D13 built-in LED (PA16) as a heartbeat, and announces each colour over the SERCOM3 serial console — so the board lights AND prints out of the box. The NeoPixel colour is REAL: the program bit-bangs the 800 kHz WS2812 one-wire protocol on PB22 and the board decodes the HIGH-pulse widths into a live RGB value (a long LOW latches the frame). "Blink D13" toggles the built-in LED (PA16) with the real SAMD51 PORT OUTSET/OUTCLR registers. "TC0 Timer Blink" enables the SAMD51 TC0 timer/counter and drives the LED straight from a bit of the running COUNT register (read back with a READSYNC command). "Serial Terminal" brings up the SERCOM3 USART and echoes whatever you type back to the console (click the on-screen keyboard in the Controller panel, or just type) toggling the LED each keystroke. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x00000000, set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real SAMD51 memory map live (FLASH 0, SRAM 0x20000000, peripherals 0x40000000, PORT 0x41008000, SERCOM3 0x41014000, DAC 0x43002400). A Metro M4 has no on-board speaker, so it is honestly silent.

Runs real compiled Adafruit Metro M4 Express firmware on an in-browser Microchip SAMD51 (ARM Cortex-M4F, 120 MHz). The default "NeoPixel Rainbow" is a bare-metal C program that cycles a smooth rainbow on the single on-board WS2812 NeoPixel (PB22), blinks the D13 built-in LED (PA16) as a heartbeat, and announces each colour over the SERCOM3 serial console — so the board lights AND prints out of the box. The NeoPixel colour is REAL: the program bit-bangs the 800 kHz WS2812 one-wire protocol on PB22 and the board decodes the HIGH-pulse widths into a live RGB value (a long LOW latches the frame). "Blink D13" toggles the built-in LED (PA16) with the real SAMD51 PORT OUTSET/OUTCLR registers. "TC0 Timer Blink" enables the SAMD51 TC0 timer/counter and drives the LED straight from a bit of the running COUNT register (read back with a READSYNC command). "Serial Terminal" brings up the SERCOM3 USART and echoes whatever you type back to the console (click the on-screen keyboard in the Controller panel, or just type) toggling the LED each keystroke. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x00000000, set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real SAMD51 memory map live (FLASH 0, SRAM 0x20000000, peripherals 0x40000000, PORT 0x41008000, SERCOM3 0x41014000, DAC 0x43002400). A Metro M4 has no on-board speaker, so it is honestly silent.

Runs real compiled Adafruit Metro M4 Express firmware on an in-browser Microchip SAMD51 (ARM Cortex-M4F, 120 MHz). The default "NeoPixel Rainbow" is a bare-metal C program that cycles a smooth rainbow on the single on-board WS2812 NeoPixel (PB22), blinks the D13 built-in LED (PA16) as a heartbeat, and announces each colour over the SERCOM3 serial console — so the board lights AND prints out of the box. The NeoPixel colour is REAL: the program bit-bangs the 800 kHz WS2812 one-wire protocol on PB22 and the board decodes the HIGH-pulse widths into a live RGB value (a long LOW latches the frame). "Blink D13" toggles the built-in LED (PA16) with the real SAMD51 PORT OUTSET/OUTCLR registers. "TC0 Timer Blink" enables the SAMD51 TC0 timer/counter and drives the LED straight from a bit of the running COUNT register (read back with a READSYNC command). "Serial Terminal" brings up the SERCOM3 USART and echoes whatever you type back to the console (click the on-screen keyboard in the Controller panel, or just type) toggling the LED each keystroke. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x00000000, set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real SAMD51 memory map live (FLASH 0, SRAM 0x20000000, peripherals 0x40000000, PORT 0x41008000, SERCOM3 0x41014000, DAC 0x43002400). A Metro M4 has no on-board speaker, so it is honestly silent.

Runs real compiled Adafruit Metro M4 Express firmware on an in-browser Microchip SAMD51 (ARM Cortex-M4F, 120 MHz). The default "NeoPixel Rainbow" is a bare-metal C program that cycles a smooth rainbow on the single on-board WS2812 NeoPixel (PB22), blinks the D13 built-in LED (PA16) as a heartbeat, and announces each colour over the SERCOM3 serial console — so the board lights AND prints out of the box. The NeoPixel colour is REAL: the program bit-bangs the 800 kHz WS2812 one-wire protocol on PB22 and the board decodes the HIGH-pulse widths into a live RGB value (a long LOW latches the frame). "Blink D13" toggles the built-in LED (PA16) with the real SAMD51 PORT OUTSET/OUTCLR registers. "TC0 Timer Blink" enables the SAMD51 TC0 timer/counter and drives the LED straight from a bit of the running COUNT register (read back with a READSYNC command). "Serial Terminal" brings up the SERCOM3 USART and echoes whatever you type back to the console (click the on-screen keyboard in the Controller panel, or just type) toggling the LED each keystroke. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x00000000, set PC breakpoints and write watchpoints, and read the ARM registers (r0-r15, xPSR, N/Z/C/V) and the real SAMD51 memory map live (FLASH 0, SRAM 0x20000000, peripherals 0x40000000, PORT 0x41008000, SERCOM3 0x41014000, DAC 0x43002400). A Metro M4 has no on-board speaker, so it is honestly silent.