MPC5xxxのトピックRe: CAN bootloader

CAN bootloader

gj3526 — Thu, 19 Mar 2020 01:51:47 GMT

Hi,

I designed a bootloader based on can. In app, it can jump to bootloader when received the fixed information through can . However, the program will crashed in can initialization after jumping to bootloader .so I have a test as atachment,In the program,I changed the address,so it can not jump to bootloader but jumped to the App again,the program also crashed when can Initializing.I find the problems through debug.

CAN_Type * base = g_flexcanBase[instance]; ------->it can not get the status of CAN rgisters

so how to deal with it？

Best regards,

Jun Gong

Re: CAN bootloader

PetrS — Wed, 25 Mar 2020 11:40:35 GMT

Hi,

I have tried given project on DEVKIT and it passes CAN init normally.

BR, Petr

Re: CAN bootloader

gj3526 — Thu, 26 Mar 2020 02:30:16 GMT

Hi Petr,

Sorry I did not make it clear,After the program runing ,use CAN tool send "ID:7F6 data:08 1e 12 15 6d 5f c9 ed",the program will jump to 0x01000000 (in my opinion,it is the same as reboot),but it will crashed in can initialization.

as flow in can.c

                    for(cnt=590;cnt<599;cnt++)//CAN2_Error_IRQn
                   {
                       INT_SYS_DisableIRQ_MC_All(cnt);
                   }
                   INT_SYS_DisableIRQGlobal();
                   INT_SYS_DisableIRQ_MC_All(PIT_Ch15_IRQn);
                   __asm__("e_lis %r12,0x00FA");
                   __asm__("e_or2i %r12,0x0010");
                   __asm__("e_lwz %r0,0(%r12)");
                   __asm__("se_mtlr %r0");
                   __asm__("se_blrl");

Best regards,

Jun Gong

Re: CAN bootloader

PetrS — Fri, 27 Mar 2020 12:05:10 GMT

Hi,

OK, after test you mentioned, I found that the Mode Transition, which is done on clock init, is pending due to previous active peripheral clock (PIT ch15). This channel is used by OSIF driver that uses a hardware timer to accurately measure time. OSIF is called when blocking function is used.

So you should disable PIT module before reinit is requested. use below code before your asm lines

PIT->MCR |= PIT_MCR_MDIS_MASK;

__asm__("e_lis %r12,0x00FA");
__asm__("e_or2i %r12,0x0010");

....

BR, Petr