STM32 Nucleo-F411RE

Runs real compiled STM32F411RE firmware on an in-browser STMicroelectronics STM32F411 (ARM Cortex-M4F, 100 MHz, with FPU) as fitted to the ST NUCLEO-F411RE board. The default is "Blink LD2": a bare-metal C program that enables the GPIOA clock in RCC, configures PA5 as an output and blinks the green user LED (LD2 on PA5 is active-high, so the LED lights when the pin is driven high). "Button toggles LD2" makes the blue user button B1 (on PC13, active-low with a pull-up) toggle the LED on each press — press B1 in the Controller panel. "USART2 Serial" brings up USART2 (TX on PA2 — the ST-Link virtual COM port) and prints a greeting then an incrementing counter to the serial console while blinking LD2. "Timer Blink (TIM2)" blinks the same LED but times it off the TIM2 general-purpose timer. All four are original CC0 programs compiled with clang for thumbv7em. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x08000000, set PC breakpoints and write watchpoints (e.g. watch USART2->DR at 0x40004404), and read the ARM registers (r0-r15, xPSR, N/Z/C/V and the FPU s0-s31) and the real STM32F411 memory map live (FLASH 0x08000000, SRAM 0x20000000, peripherals 0x40000000). A Nucleo has no on-board speaker, so it is honestly silent.

Runs real compiled STM32F411RE firmware on an in-browser STMicroelectronics STM32F411 (ARM Cortex-M4F, 100 MHz, with FPU) as fitted to the ST NUCLEO-F411RE board. The default is "Blink LD2": a bare-metal C program that enables the GPIOA clock in RCC, configures PA5 as an output and blinks the green user LED (LD2 on PA5 is active-high, so the LED lights when the pin is driven high). "Button toggles LD2" makes the blue user button B1 (on PC13, active-low with a pull-up) toggle the LED on each press — press B1 in the Controller panel. "USART2 Serial" brings up USART2 (TX on PA2 — the ST-Link virtual COM port) and prints a greeting then an incrementing counter to the serial console while blinking LD2. "Timer Blink (TIM2)" blinks the same LED but times it off the TIM2 general-purpose timer. All four are original CC0 programs compiled with clang for thumbv7em. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x08000000, set PC breakpoints and write watchpoints (e.g. watch USART2->DR at 0x40004404), and read the ARM registers (r0-r15, xPSR, N/Z/C/V and the FPU s0-s31) and the real STM32F411 memory map live (FLASH 0x08000000, SRAM 0x20000000, peripherals 0x40000000). A Nucleo has no on-board speaker, so it is honestly silent.

Runs real compiled STM32F411RE firmware on an in-browser STMicroelectronics STM32F411 (ARM Cortex-M4F, 100 MHz, with FPU) as fitted to the ST NUCLEO-F411RE board. The default is "Blink LD2": a bare-metal C program that enables the GPIOA clock in RCC, configures PA5 as an output and blinks the green user LED (LD2 on PA5 is active-high, so the LED lights when the pin is driven high). "Button toggles LD2" makes the blue user button B1 (on PC13, active-low with a pull-up) toggle the LED on each press — press B1 in the Controller panel. "USART2 Serial" brings up USART2 (TX on PA2 — the ST-Link virtual COM port) and prints a greeting then an incrementing counter to the serial console while blinking LD2. "Timer Blink (TIM2)" blinks the same LED but times it off the TIM2 general-purpose timer. All four are original CC0 programs compiled with clang for thumbv7em. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x08000000, set PC breakpoints and write watchpoints (e.g. watch USART2->DR at 0x40004404), and read the ARM registers (r0-r15, xPSR, N/Z/C/V and the FPU s0-s31) and the real STM32F411 memory map live (FLASH 0x08000000, SRAM 0x20000000, peripherals 0x40000000). A Nucleo has no on-board speaker, so it is honestly silent.

Runs real compiled STM32F411RE firmware on an in-browser STMicroelectronics STM32F411 (ARM Cortex-M4F, 100 MHz, with FPU) as fitted to the ST NUCLEO-F411RE board. The default is "Blink LD2": a bare-metal C program that enables the GPIOA clock in RCC, configures PA5 as an output and blinks the green user LED (LD2 on PA5 is active-high, so the LED lights when the pin is driven high). "Button toggles LD2" makes the blue user button B1 (on PC13, active-low with a pull-up) toggle the LED on each press — press B1 in the Controller panel. "USART2 Serial" brings up USART2 (TX on PA2 — the ST-Link virtual COM port) and prints a greeting then an incrementing counter to the serial console while blinking LD2. "Timer Blink (TIM2)" blinks the same LED but times it off the TIM2 general-purpose timer. All four are original CC0 programs compiled with clang for thumbv7em. Open the debugger, or add ?debug, to single-STEP real Thumb instructions from flash at 0x08000000, set PC breakpoints and write watchpoints (e.g. watch USART2->DR at 0x40004404), and read the ARM registers (r0-r15, xPSR, N/Z/C/V and the FPU s0-s31) and the real STM32F411 memory map live (FLASH 0x08000000, SRAM 0x20000000, peripherals 0x40000000). A Nucleo has no on-board speaker, so it is honestly silent.