These programs demonstrate use of bi_ptr variables, which can be configured in a binary post-compilation using the picotool config command.
You can view the configurable variables with
$ picotool blink_any.uf2
File blink_any.uf2:
LED Configuration:
LED_PIN = 25
LED_TYPE = 0
$ picotool config hello_anything.uf2
File hello_anything.uf2:
text = "Hello, world!"
Enabled Interfaces:
use_usb = 1
use_uart = 1
UART Configuration:
uart_baud = 115200
uart_rx = 1
uart_tx = 0
uart_num = 0
For example, to blink the LED on pin 7 instead of 25 use
$ picotool config blink_any.uf2 -s LED_PIN 7
File blink_any.uf2:
LED_PIN = 25
setting LED_PIN -> 7
Or to change the printed string use
$ picotool config hello_anything.uf2 -s text "Goodbye, world!"
File hello_anything.uf2:
text = "Hello, world!"
setting text -> "Goodbye, world!"
The binaries can also be configured after being loaded onto the device with
$ picotool config
text = "Hello, world!"
Enabled Interfaces:
use_usb = 1
use_uart = 1
UART Configuration:
uart_baud = 115200
uart_rx = 1
uart_tx = 0
uart_num = 0
$ picotool config -s use_uart 0
use_uart = 1
setting use_uart -> 0