I want to download the bootloader onto the S32K144 board.The following error occurred after running the startup code, provided for reference.
No source available for "0xfffffffe"
BusFault: A bus fault has occurred on exception entry.
MemManage: The processor attempted an instruction fetch from a location that does not permit execution.
HardFault: A fault has been escalated to a hard fault.
#include "timeout.h"
#include "comm.h"
#include "clock.h"
#include <stdio.h>
#include "power_rcm_hw_access.h"
#include "uart.h"
#define APP_START_ADDRESS 0x00008000
uint8_t boot_from_comm = 0;
static void JumpToUserApplication( unsigned int userSP, unsigned int userStartup);
void Bootup_Application(uint32_t appEntry, uint32_t appStack);
int main(void) {
uint32_t time = 50000;
uint32_t appEntry, appStack;
uint8_t bootCount = 0;
uint8_t bootInfo = 0;
uint8_t DOWN_LINK = 0;
clock_initi();
init_comm();
init_timeout();
do{
if(comm_status_rx())
bootInfo = UART_GetChar(UART_PORT);
if(bootInfo == 0x2A)
bootCount++;
else
bootCount = 0;
if(bootCount>=4) {
DOWN_LINK = 1;
UART_PutChar(UART_PORT, LINKED); }
} while(!timeout() && (!DOWN_LINK));
if(DOWN_LINK) {
do{
uint8_t word_received = comm_status_rx();
if(word_received){
boot_from_comm = 1;
comm_download_app(); }
} while(!boot_from_comm);
}
disable_timeout();
disable_comm();
reset_clock();
while(time--);
appStack = *(uint32_t *)(APP_START_ADDRESS);
appEntry = *(uint32_t *)(APP_START_ADDRESS + 4);
Bootup_Application(appEntry, appStack);
for (;;) {};
return 0; }
void JumpToUserApplication( unsigned int userSP, unsigned int userStartup) {
if(userSP == 0xFFFFFFFF){ return; }
__asm("msr msp, r0");
__asm("msr psp, r0");
S32_SCB->VTOR = (uint32_t)APP_START_ADDRESS;
__asm("mov pc, r1"); }
void Bootup_Application(uint32_t appEntry, uint32_t appStack) {
static void (*jump_to_application)(void);
static uint32_t stack_pointer;
jump_to_application = (void (*)(void))appEntry;
stack_pointer = appStack;
S32_SCB->VTOR = (uint32_t)APP_START_ADDRESS;
__asm volatile ("MSR msp, %0\n" : : "r" (stack_pointer) : "sp");
__asm volatile ("MSR psp, %0\n" : : "r" (stack_pointer) : "sp");
jump_to_application(); }
