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I am making software bootloader for my STM32F407, and i managed to successfully write firmware in flash, starting at address 0x08004000 and I want to jump to it so my board can start executing that firmware.
Here is my code which is not working:
void jumpToApplication(void) {
// Explicit debug markers
sendUSART2('D'); // Debug start marker
sendUSART2('1'); // First debug point
// Read the initial stack pointer (first 4 bytes of vector table)
uint32_t* stack_pointer = (uint32_t*)0x08004000;
// Explicit null check
if (!stack_pointer) {
sendUSART2('N'); // Null pointer error
toggleErrorLed();
return;
}
sendUSART2('2'); // Second debug point
// Explicit value sending with multiple characters
sendUSART2('S'); // Stack pointer indicator
sendUSART2('P'); // Prefix for stack pointer value
// Send each byte of the stack pointer value
uint32_t sp_value = *stack_pointer;
sendExactValue(sp_value);
sendUSART2('3'); // Third debug point
// Read the reset vector (address of reset handler, 4 bytes after stack pointer)
uint32_t* reset_vector = (uint32_t*)(0x08004000 + 4);
// Explicit null check
if (!reset_vector) {
sendUSART2('M'); // Null reset vector error
toggleErrorLed();
return;
}
sendUSART2('4'); // Fourth debug point
// Send reset vector value
sendUSART2('R'); // Reset vector indicator
sendUSART2('V'); // Prefix for reset vector value
// Send each byte of the reset vector value
uint32_t rv_value = *reset_vector;
sendExactValue(rv_value);
sendUSART2('5'); // Fifth debug point
// Validate stack pointer is in valid RAM range
if ((sp_value & 0x2FFE0000) != 0x20000000) {
// Invalid stack pointer
sendUSART2('I'); // Invalid stack pointer error
sendUSART2('S');
toggleErrorLed();
return;
}
sendUSART2('6'); // Sixth debug point
// Validate reset vector is in valid Flash range
if ((rv_value & 0xFFF00000) != 0x08000000) {
// Invalid reset vector (not in Flash memory)
sendUSART2('I'); // Invalid reset vector error
sendUSART2('R');
toggleErrorLed();
return;
}
sendUSART2('7'); // Final debug point
// Disable all interrupts
__disable_irq();
// Set the vector table location
SCB->VTOR = 0x08004000;
// Load the stack pointer
__set_MSP(*stack_pointer);
// Create function pointer to reset handler
void (*app_reset_handler)(void) = (void*)(*reset_vector);
// Jump to application
app_reset_handler();
}
According to debug I'm getting "invalid stack pointer" error.
I am making software bootloader for my STM32F407, and i managed to successfully write firmware in flash, starting at address 0x08004000 and I want to jump to it so my board can start executing that firmware.
Here is my code which is not working:
void jumpToApplication(void) {
// Explicit debug markers
sendUSART2('D'); // Debug start marker
sendUSART2('1'); // First debug point
// Read the initial stack pointer (first 4 bytes of vector table)
uint32_t* stack_pointer = (uint32_t*)0x08004000;
// Explicit null check
if (!stack_pointer) {
sendUSART2('N'); // Null pointer error
toggleErrorLed();
return;
}
sendUSART2('2'); // Second debug point
// Explicit value sending with multiple characters
sendUSART2('S'); // Stack pointer indicator
sendUSART2('P'); // Prefix for stack pointer value
// Send each byte of the stack pointer value
uint32_t sp_value = *stack_pointer;
sendExactValue(sp_value);
sendUSART2('3'); // Third debug point
// Read the reset vector (address of reset handler, 4 bytes after stack pointer)
uint32_t* reset_vector = (uint32_t*)(0x08004000 + 4);
// Explicit null check
if (!reset_vector) {
sendUSART2('M'); // Null reset vector error
toggleErrorLed();
return;
}
sendUSART2('4'); // Fourth debug point
// Send reset vector value
sendUSART2('R'); // Reset vector indicator
sendUSART2('V'); // Prefix for reset vector value
// Send each byte of the reset vector value
uint32_t rv_value = *reset_vector;
sendExactValue(rv_value);
sendUSART2('5'); // Fifth debug point
// Validate stack pointer is in valid RAM range
if ((sp_value & 0x2FFE0000) != 0x20000000) {
// Invalid stack pointer
sendUSART2('I'); // Invalid stack pointer error
sendUSART2('S');
toggleErrorLed();
return;
}
sendUSART2('6'); // Sixth debug point
// Validate reset vector is in valid Flash range
if ((rv_value & 0xFFF00000) != 0x08000000) {
// Invalid reset vector (not in Flash memory)
sendUSART2('I'); // Invalid reset vector error
sendUSART2('R');
toggleErrorLed();
return;
}
sendUSART2('7'); // Final debug point
// Disable all interrupts
__disable_irq();
// Set the vector table location
SCB->VTOR = 0x08004000;
// Load the stack pointer
__set_MSP(*stack_pointer);
// Create function pointer to reset handler
void (*app_reset_handler)(void) = (void*)(*reset_vector);
// Jump to application
app_reset_handler();
}
According to debug I'm getting "invalid stack pointer" error.
Share Improve this question asked Mar 28 at 0:54 dinajsdinajs 1181 silver badge6 bronze badges 2 |1 Answer
Reset to default 0Since the STM32F407 has 512kB flash memory, the jump address might shift depending on the memory layout. Had the same problem when I moved to a bigger MCU.
So try using this instead:
if ((sp_value & 0x2FFC0000) != 0x20000000)
本文标签： cProblem with jumping to applicationSTM32 BootloaderStack Overflow
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SPxxxxandRVyyyy). Yes, you're getting an invalid stack pointer, but what value are you getting? Are you verifying the burn by comparing the ROM data to the packet buffer? Are bytes corrupted/random or are they just out of place? That is, do you see a known/valid value for SP/RV somewhere but at the wrong buffer offset? – Craig Estey Commented Mar 28 at 1:29