STM settings running in RAM

The following settings are required:

1. Writing RAM.INI file

FUNC void Setup (void) {

  SP = _RDWORD(0x20000000);          // Setup Stack Pointer

  PC = _RDWORD(0x20000004);          // Setup Program Counter

  _WDWORD(0xE000ED08, 0x20000000);   // Setup Vector Table Offset Register  
 
 

}

LOAD .\output\release.axf INCREMENTAL      // Download，.axf 

Setup();                             // Setup for Running

g, main

2. Reset NVIC in the main function as follows:

#ifdef  VECT_TAB_RAM
  /* Set the Vector Table base location at 0x20000000 */
  NVIC_SetVectorTable(NVIC_VectTab_RAM+0x2000, 0x0);
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);  // NVIC_VectTab_FLASH
#endif

3. Click OPTION->DEBUG option SETTING -> FLASH DOWNLOAD and then REMOVE FLASH.

4. Define RAM_MODE, REMAP in OPTION-》ASM in the startup file

5. Select ULINK1 Cortex Debugger in the Debug tab (the software uses the crack method of brother yjgyiysbcc). Unselect Load Application at Start and add the startup script RAM.ini in Initialization.

6. Set the program download address in the TARGET option. As shown in the figure below, the address of IROM1 points to the RAM space of STM32. How to allocate the space depends on your needs. The internal RAM size of this processor is 20K, 16K is allocated to the read-only area, and 4K is allocated to the readable and writable area. In this way, the size of IROM is set to 0x4000, the start of IRAM1 becomes 0X20004000, and the size is only 0X1000.

7. Uncheck UPDATE TARGET BEFORE DEBUGING in the UTILITES option