Hello!
I'm using an RP2040 to drive an 65c02 processor and call this a computer. Code is available on github.
This implements a mass storage device using the Pico's flash as backend. However, this implementation has a race condition when writing. To make sure that the write will not be interfered, I used code discussed in this forum.
This code runs on core1 (src/rp2040/native/dhara_flash.c):Core0 had executed "multicore_lockout_victim_init();"
Running it in VSCode with a debug probe and breaking during the lockup has shown the following callstack:When I try to single step, the system locks up totally.
What am I doing wrong here?
I can't spot a difference between my implementation and other references, I've seen so far. Do I have to do something additionally, since I'm using USB UART?
What can I do to make my code bulletproof against this kind of problem? While I've got some experience in embedded development, I've got no idea what to try next
I'm using an RP2040 to drive an 65c02 processor and call this a computer. Code is available on github.
This implements a mass storage device using the Pico's flash as backend. However, this implementation has a race condition when writing. To make sure that the write will not be interfered, I used code discussed in this forum.
This code runs on core1 (src/rp2040/native/dhara_flash.c):
Code:
uint32_t interrupts = save_and_disable_interrupts(); multicore_lockout_start_blocking(); // <- this does not return flash_range_program( FLASH_DRIVE_OFFSET + (p*PAGE_SIZE), data, PAGE_SIZE ); multicore_lockout_end_blocking(); restore_interrupts( interrupts );Running it in VSCode with a debug probe and breaking during the lockup has shown the following callstack:
Code:
cancel_alarm@0x100055a4 (.../pico-sdk/src/common/pico_time/include/pico/time.h:681)best_effort_wfe_or_timeout@0x10005730 (.../pico-sdk/src/common/pico_time/time.c:460)multicore_fifo_pop_timeout_us@0x1000aac2 (.../pico-sdk/src/rp2_common/pico_multicore/multicore.c:62)multicore_lockout_handshake@0x1000ab50 (.../pico-sdk/src/rp2_common/pico_multicore/multicore.c:256)multicore_lockout_start_block_until@0x1000aba6 (.../pico-sdk/src/rp2_common/pico_multicore/multicore.c:273)multicore_lockout_start_blocking@0x1000ad78 (.../pico-sdk/src/rp2_common/pico_multicore/multicore.c:284)dhara_nand_prog@0x100045e2 (.../github/src/rp2040/native/dhara_flash.c:248)dhara_journal_enqueue@0x10002734 (.../github/src/rp2040/dhara/journal.c:836)dhara_map_write@0x10002e58 (.../github/src/rp2040/dhara/map.c:359)dhara_flash_write@0x1000450a (.../github/src/rp2040/native/dhara_flash.c:148)handle_flash_dma@0x100035c2 (.../github/src/rp2040/native/core1.c:532)handle_io@0x10003960 (.../github/src/rp2040/native/core1.c:1014)bus_run@0x100042d6 (.../github/src/rp2040/native/core1.c:1071)core1_wrapper@0x1000a9e4 (.../pico-sdk/src/rp2_common/pico_multicore/multicore.c:97)??@0x0000017e (Unknown Source:0)What am I doing wrong here?
I can't spot a difference between my implementation and other references, I've seen so far. Do I have to do something additionally, since I'm using USB UART?
What can I do to make my code bulletproof against this kind of problem? While I've got some experience in embedded development, I've got no idea what to try next
Statistics: Posted by SvOlli — Sun Dec 08, 2024 5:05 pm