void setup() {
 asm(R"(
.syntax unified
.cpu cortex-m0plus
.thumb
gpio_all_pins_mask: .word 0
gpio_even_pins_mask: .word 0

.equ IO_BANK0_BASE, 0x40014000
.equ IO_BANK0_GPIO_CTRL_BASE, IO_BANK0_BASE + 0x04
.equ FUNCSEL_SIO, 5
.equ GPIO_FUNCSEL, FUNCSEL_SIO
.equ GPIO_INIT_VALUE, (GPIO_FUNCSEL<<0)

@ RP2040 Section: 2.19.6.3. Pad Control - User Bank
.equ PADS_BANK0_BASE, 0x4001c000
.equ PADS_BANK0_GPIO_OFFSET, 0x04
.equ PADS_BANK0_GPIO_BASE, PADS_BANK0_BASE + PADS_BANK0_GPIO_OFFSET
@ Bit 7 - OD Output disable. Has priority over output enable from peripherals RW 0x0
@ Bit 6 - IE Input enable RW 0x1
@ Bits 5:4 - DRIVE Drive strength.
@           0x0 → 2mA
@           0x1 → 4mA
@           0x2 → 8mA
@           0x3 → 12mA
@           RW 0x1
@ Bit 3 - PUE Pull up enable RW 0x0
@ Bit 2 - PDE Pull down enable RW 0x1
@ Bit 1 - SCHMITT Enable schmitt trigger RW 0x1
@ Bit 0 - SLEWFAST Slew rate control. 1 = Fast, 0 = Slow RW 0x0
@          bit nums:   76543210
.equ PAD_INIT_VALUE, 0b00010110

@ RP2040 Section: 2.3.1. SIO
@ 2.3.1.7. List of Registers
.equ SIO_BASE, 0xd0000000
.equ GPIO_OE,     SIO_BASE + 0x020 @ GPIO output enable
.equ GPIO_OE_SET, SIO_BASE + 0x024 @ GPIO output enable set
.equ GPIO_OE_CLR, SIO_BASE + 0x028 @ GPIO output enable clear
.equ GPIO_OE_XOR, SIO_BASE + 0x02c @ GPIO output enable XOR
.equ GPIO_OUT,     SIO_BASE + 0x010 @ GPIO output value
.equ GPIO_OUT_SET, SIO_BASE + 0x014 @ GPIO output value set
.equ GPIO_OUT_CLR, SIO_BASE + 0x018 @ GPIO output value clear
.equ GPIO_OUT_XOR, SIO_BASE + 0x01c @ GPIO output value XOR

LEDS: .byte 8, 9, 10, 11, 12, 13, 14, 15
LEDS_LEN = . - LEDS
)");
}
void loop() {
 // put your main code here, to run repeatedly:
 delay(1); // this speeds up the simulation
}