SDK • RP2350 - interaction between multicore interrupts and flash EEPROM

Code:

ALLOW_INTERRUPTS        USE_FLASH        Result          Off             Off            Silly          Off             On             Works and programs flash          On              Off             Doesn’t crash but doesn’t program flash          On              On              PANIC  Hard Assert

Code:

/** * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause *///#define ALLOW_INTERRUPTS    1#define USE_FLASH           1#include <stdio.h>#include <stdlib.h>#include "pico/stdlib.h"#include "pico/flash.h"#include "pico/multicore.h"#include "hardware/flash.h"void core1_main(){    printf("Core 1 starting\n");    multicore_fifo_clear_irq();     // Do we need this?    #ifdef USE_FLASH    // Let the system know that this core is willing to be a 'victim'    // of blocking whilst the flash is being written.    if(!flash_safe_execute_core_init()) {        printf("flash_safe_execute_core_init() FAILED\n");    }#endif    while(1);}// We're going to erase and reprogram a region 2 sectore from the end of flash.#define FLASH_TARGET_OFFSET (PICO_FLASH_SIZE_BYTES - ((FLASH_SECTOR_SIZE) * 2))const uint8_t *flash_target_contents = (const uint8_t *) (XIP_BASE + FLASH_TARGET_OFFSET);// This function will be called when it's safe to call flash_range_erasestatic void call_flash_range_erase(void *param) {    uint32_t offset = (uint32_t)param;    flash_range_erase(offset, FLASH_SECTOR_SIZE);}// This function will be called when it's safe to call flash_range_programstatic void call_flash_range_program(void *param) {    uint32_t offset = ((uintptr_t*)param)[0];    const uint8_t *data = (const uint8_t *)((uintptr_t*)param)[1];    flash_range_program(offset, data, FLASH_PAGE_SIZE);}void core0_sio_irq(){    multicore_fifo_clear_irq();     //Never actually going to happen}int main() {    stdio_init_all();    sleep_ms(500);    uint8_t random_data[FLASH_PAGE_SIZE];    for (uint i = 0; i < FLASH_PAGE_SIZE; ++i)        random_data[i] = rand() >> 16;printf("Starting core 1\n"); multicore_launch_core1(core1_main);#ifdef ALLOW_INTERRUPTS    irq_set_exclusive_handler(SIO_FIFO_IRQ_NUM(0), core0_sio_irq);    irq_set_enabled(SIO_FIFO_IRQ_NUM(0), true);#endif#ifdef USE_FLASH    sleep_ms(800);          // Let core1 register as a victim    printf("Calling erase\n");    int rc = flash_safe_execute(call_flash_range_erase, (void*)FLASH_TARGET_OFFSET, UINT32_MAX);    if(rc != PICO_OK) {        printf("flash_safe_execute (Erase) returned %d\n", rc);        while(1)            ;    }    printf("\nProgramming target region...\n");    uintptr_t params[] = { FLASH_TARGET_OFFSET, (uintptr_t)random_data};    rc = flash_safe_execute(call_flash_range_program, params, UINT32_MAX);    hard_assert(rc == PICO_OK);    printf("\nProgramming successful\n");#else    printf("Still alive\n");#endif    while(1)        ;}

Code:

# Generated Cmake Pico project filecmake_minimum_required(VERSION 3.13)set(CMAKE_C_STANDARD 11)set(CMAKE_CXX_STANDARD 17)set(CMAKE_EXPORT_COMPILE_COMMANDS ON)# Initialise pico_sdk from installed location# (note this can come from environment, CMake cache etc)# == DO NOT EDIT THE FOLLOWING LINES for the Raspberry Pi Pico VS Code Extension to work ==if(WIN32)    set(USERHOME $ENV{USERPROFILE})else()    set(USERHOME $ENV{HOME})endif()set(sdkVersion 2.1.1)set(toolchainVersion 14_2_Rel1)set(picotoolVersion 2.1.1)set(picoVscode ${USERHOME}/.pico-sdk/cmake/pico-vscode.cmake)if (EXISTS ${picoVscode})    include(${picoVscode})endif()# ====================================================================================set(PICO_BOARD pico2 CACHE STRING "Board type")# Pull in Raspberry Pi Pico SDK (must be before project)include(pico_sdk_import.cmake)project(new_flash C CXX ASM)# Initialise the Raspberry Pi Pico SDKpico_sdk_init()# Add executable. Default name is the project name, version 0.1add_executable(new_flash new_flash.c )pico_set_program_name(new_flash "new_flash")pico_set_program_version(new_flash "0.1")# Modify the below lines to enable/disable output over UART/USBpico_enable_stdio_uart(new_flash 1)pico_enable_stdio_usb(new_flash 0)# Add the standard library to the buildtarget_link_libraries(new_flash        pico_stdlib        pico_multicore        hardware_flash)# Add the standard include files to the buildtarget_include_directories(new_flash PRIVATE        ${CMAKE_CURRENT_LIST_DIR})pico_add_extra_outputs(new_flash)