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hello_double_tap: use pico_bootsel_via_double_reset from SDK #53

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Merged
kilograham merged 2 commits into from
Feb 19, 2021
Merged

hello_double_tap: use pico_bootsel_via_double_reset from SDK #53

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161e96b
hello_double_tap: use pico_bootsel_via_double_reset from SDK
Wren6991 Feb 16, 2021
9de1a63
Also update readme for pico_bootsel_via_double_reset
Wren6991 Feb 16, 2021
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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -156,7 +156,7 @@ App|Description

App|Description
---|---
[hello_double_tap](system/hello_double_tap) | On dev boards with a reset button (but no BOOTSEL), a magic number in RAM can be used to enter the USB bootloader, when the reset button is pressed twice quickly.
[hello_double_tap](system/hello_double_tap) | An LED blink with the `pico_bootsel_via_double_reset` library linked. This enters the USB bootloader when it detects the system being reset twice in quick succession, which is useful for boards with a reset button but no BOOTSEL button.
[narrow_io_write](system/narrow_io_write) | Demonstrate the effects of 8-bit and 16-bit writes on a 32-bit IO register.
[unique_board_id](system/unique_board_id) | Read the 64 bit unique ID from external flash, which serves as a unique identifier for the board.
### Timer
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1 change: 0 additions & 1 deletion system/CMakeLists.txt
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@@ -1,5 +1,4 @@
if (NOT PICO_NO_HARDWARE)
add_subdirectory(double_tap_usb_boot)
add_subdirectory(narrow_io_write)
add_subdirectory(hello_double_tap)
add_subdirectory(unique_board_id)
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13 changes: 0 additions & 13 deletions system/double_tap_usb_boot/CMakeLists.txt
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This file was deleted.

36 changes: 0 additions & 36 deletions system/double_tap_usb_boot/double_tap_usb_boot.c
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11 changes: 9 additions & 2 deletions system/hello_double_tap/CMakeLists.txt
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Expand Up @@ -2,12 +2,19 @@ add_executable(hello_double_tap
hello_double_tap.c
)

# Double tap reset into bootrom is injected by linking with the double_tap_usb_boot library
# Double tap reset into bootrom is injected by linking with the
# pico_bootsel_via_double_reset library
target_link_libraries(hello_double_tap
pico_stdlib
double_tap_usb_boot
pico_bootsel_via_double_reset
)

# Entering the bootloader in this way also lets us specify a GPIO to be used
# as a bootloader activity LED:
target_compile_definitions(hello_double_tap PRIVATE
PICO_BOOTSEL_VIA_DOUBLE_RESET_ACTIVITY_LED=25
)

pico_add_extra_outputs(hello_double_tap)

# add url via pico_set_program_url
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10 changes: 7 additions & 3 deletions system/hello_double_tap/hello_double_tap.c
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Expand Up @@ -6,10 +6,14 @@

#include "pico/stdlib.h"

// This is a regular old LED blinking example, however it is linked with double_tap_usb_boot
// so pressing reset quickly twice, will reset into USB bootloader
// This is a regular old LED blinking example, however it is linked with the
// `pico_bootsel_via_double_reset` library, so resetting the board twice
// quickly will enter the USB bootloader. This is useful for boards which have
// a reset button but no BOOTSEL, as long as you remember to always link the
// `pico_bootsel_via_double_reset` library!

int main() {
const uint LED_PIN = 21;
const uint LED_PIN = PICO_DEFAULT_LED_PIN;
gpio_init(LED_PIN);
gpio_set_dir(LED_PIN, GPIO_OUT);
while (true) {
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