PicoSDK
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Outline
#include <stdio.h>
#include <stdarg.h>
#include <sys/cdefs.h>
#include <unistd.h>
#include "pico/platform/panic.h"
#include "pico/printf.h"
#define weak_raw_printf
#define weak_raw_vprintf
panic_unsupported()
#define PICO_PANIC_FUNCTION_EMPTY
panic(const char *, ...)
Files
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SourceVuRaspberry Pi Pico SDK and ExamplesPicoSDKsrc/rp2_common/pico_platform_panic/panic.c
 
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/* * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause *//* ... */ #include <stdio.h> #include <stdarg.h> #include <sys/cdefs.h> #include <unistd.h> #include "pico/platform/panic.h" 5 includes #if LIB_PICO_PRINTF_PICO #include "pico/printf.h" #else #define weak_raw_printf printf #define weak_raw_vprintf vprintf /* ... */#endif void __attribute__((noreturn)) panic_unsupported(void) { panic("not supported"); }{ ... } // PICO_CONFIG: PICO_PANIC_FUNCTION, Name of a function to use in place of the stock panic function or empty string to simply breakpoint on panic, group=pico_runtime // note the default is not "panic" it is undefined #ifdef PICO_PANIC_FUNCTION #define PICO_PANIC_FUNCTION_EMPTY (__CONCAT(PICO_PANIC_FUNCTION, 1) == 1) #if !PICO_PANIC_FUNCTION_EMPTY extern void __attribute__((noreturn)) __printflike(1, 0) PICO_PANIC_FUNCTION(__unused const char *fmt, ...); #endif // Use a forwarding method here as it is a little simpler than renaming the symbol as it is used from assembler void __attribute__((naked, noreturn)) __printflike(1, 0) panic(__unused const char *fmt, ...) { // if you get an undefined reference here, you didn't define your PICO_PANIC_FUNCTION! pico_default_asm ( #ifdef __riscv #if !PICO_PANIC_FUNCTION_EMPTY "jal " __XSTRING(PICO_PANIC_FUNCTION) "\n" #endif "ebreak\n" "1: j 1b\n" /* ... */ #else "push {lr}\n" #if !PICO_PANIC_FUNCTION_EMPTY "bl " __XSTRING(PICO_PANIC_FUNCTION) "\n" #endif "bkpt #0\n" "1: b 1b\n" // loop for ever as we are no return /* ... */ #endif : : : ); }panic (__unused const char *fmt, ...) { ... } /* ... */#else // todo consider making this try harder to output if we panic early // right now, print mutex may be uninitialised (in which case it deadlocks - although after printing "PANIC") // more importantly there may be no stdout/UART initialized yet // todo we may want to think about where we print panic messages to; writing to USB appears to work // though it doesn't seem like we can expect it to... fine for now void __attribute__((noreturn)) __printflike(1, 0) panic(const char *fmt, ...) { puts("\n*** PANIC ***\n"); if (fmt) { #if LIB_PICO_PRINTF_NONE puts(fmt); #else va_list args; va_start(args, fmt); #if PICO_PRINTF_ALWAYS_INCLUDED vprintf(fmt, args); #else weak_raw_vprintf(fmt, args); #endif va_end(args); puts("\n");/* ... */ #endif }if (fmt) { ... } _exit(1); }{ ... } #endif/* ... */
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