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hello_double_tap: use pico_bootsel_via_double_reset from SDK

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This commit is contained in:
Luke Wren 2021-02-16 13:53:27 +00:00 committed by Graham Sanderson
parent cad9225899
commit 6cc888c255
5 changed files with 16 additions and 55 deletions
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1
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)

13
system/double_tap_usb_boot/CMakeLists.txt
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@ -1,13 +0,0 @@
add_library(double_tap_usb_boot INTERFACE)
# inclusion of this library will allow you to double tap reset within 100ms to launch into bootrom USB bootloader
if (PICO_ON_DEVICE)
target_sources(double_tap_usb_boot INTERFACE
${CMAKE_CURRENT_LIST_DIR}/double_tap_usb_boot.c
)
target_link_libraries(double_tap_usb_boot INTERFACE
pico_bootrom
pico_time
)
endif ()

36
system/double_tap_usb_boot/double_tap_usb_boot.c
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@ -1,36 +0,0 @@
#include "pico.h"
#include "pico/time.h"
#include "pico/bootrom.h"
// Allow user override of the LED mask
#ifndef USB_BOOT_LED_ACTIVITY_MASK
#define USB_BOOT_LED_ACTIVITY_MASK 0
#endif
// Doesn't make any sense for a RAM only binary
#if !PICO_NO_FLASH
static const uint32_t magic_token[] = {
0xf01681de, 0xbd729b29, 0xd359be7a,
};
static uint32_t __uninitialized_ram(magic_location)[count_of(magic_token)];
// run at initialization time
static void __attribute__((constructor)) boot_double_tap_check() {
for (uint i = 0; i < count_of(magic_token); i++) {
if (magic_location[i] != magic_token[i]) {
// Arm for 100 ms then disarm and continue booting
for (i = 0; i < count_of(magic_token); i++) {
magic_location[i] = magic_token[i];
}
busy_wait_us(100000);
magic_location[0] = 0;
return;
}
}
magic_location[0] = 0;
reset_usb_boot(USB_BOOT_LED_ACTIVITY_MASK, 0);
}
#endif

11
system/hello_double_tap/CMakeLists.txt
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@ -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

10
system/hello_double_tap/hello_double_tap.c
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@ -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) {