Posted on June 01, 2017 at 17:34Hello,
I have some problems to implement a bootloader in a STM32F4. I searched on internet and I found coherent informations and examples, but I 'm not able to make simple test work.
Here my simple code:
bootloader (writed on 0x08000000 address):
&sharpdefine APPLICATION_ADDRESS 0x08008000
typedef void (*pFunction)(void);
pFunction appEntry;
uint32_t appStack, test, i;
int main(void){
/* Get the application stack pointer (First entry in the application vector table) */
appStack = (uint32_t) *((__IO uint32_t*)APPLICATION_ADDRESS);
/* Get the application entry point (Second entry in the application vector table) */
appEntry = (pFunction) *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
/* Reconfigure vector table offset register to match the application location */
SCB->VTOR = APPLICATION_ADDRESS;
/* Set the application stack pointer */
__set_MSP(appStack);
/* Start the application */
appEntry();
while(1);
return 0;
}
program (writed on 0x08008000 address):
int main(void){
register uint32_t tl;
GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;
RCC_DeInit();
// Enable HSE
RCC_HSEConfig(RCC_HSE_ON);
// Wait till HSE is ready
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS){
// HCLK = SYSCLK impostato a 168 tick
RCC_HCLKConfig(RCC_SYSCLK_Div1);
// PCLK2 = HCLK/2 perch� massimo � 84Mhz
RCC_PCLK2Config(RCC_HCLK_Div2);
// PCLK1 = HCLK/4 perch� massimo � 42Mhz
RCC_PCLK1Config(RCC_HCLK_Div4);
// PLLCLK = 168 MHz
RCC_PLLConfig(RCC_PLLSource_HSE, 12, 336, 2, 7);
// PLLCLK = 144 MHz
//RCC_PLLConfig(RCC_PLLSource_HSE, 12, 288, 2, 6);
// Enable PLL
RCC_PLLCmd(ENABLE);
// Wait till PLL is ready
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
// Select PLL as system clock source
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
// Wait till PLL is used as system clock source
while(RCC_GetSYSCLKSource() != 0x08){}
SystemCoreClockUpdate();
}
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOG, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOG, &GPIO_InitStructure);
GPIO_SetBits(GPIOG, GPIO_Pin_4);
while(1){
for(tl=0; tl < 0xFFFFFF; tl++); // about 0.6 seconds
GPIO_ToggleBits(GPIOG, GPIO_Pin_4);
}
return 0;
}
I write program to 0x08000000 address for test and it works, so I'm sure there is no bugs.
When I use bootloader system doesn't work. I try to understand with debugger and I see that instruction appEntry(); has no effect and next command is while(1);
Can anyone tell me where it is wrong?
Thanks
Roberto
#bootloader #stm-32f407
