LPC Microcontrollers中的主题 Re: lpc54607 Running Application on external ram

lpc54607 Running Application on external ram

omeraygor — Wed, 05 Jan 2022 07:13:15 GMT

Hi,

i ama tring to run application on external ram. wrote a bootloader application that copies bin file from flash to externam sdram. then calling this function.

/* execute the firmware exists in sramx. */
typedef void(*func_0_t)(void);
void app_execute_ram_firmware(void * addr)
{
PRINTF("Function Starts...\n");

uint32_t * vector_table = (uint32_t *)addr;
uint32_t sp_base = vector_table[0];
func_0_t pc_func = (func_0_t)(vector_table[1]);
// func_0_t pc_func = (func_0_t)(addr + 4);

PRINTF("Function Starts... vector_table:%x\n",vector_table);
PRINTF("Function Starts... sp_base:%x\n",sp_base);
PRINTF("Function Starts... pc_func:%x\n",pc_func);
/* set new msp and psp. */
__set_MSP(sp_base);
__set_PSP(sp_base);
#if __VTOR_PRESENT == 1
SCB->VTOR = addr;
#endif
/* jump to application. */

pc_func();
/* the code should never reach here. */
while (1)
{}
}

my program output like this:

EEPROM init is OK.
File size is 16872.
BOOTLOADER file is OK.
Function Starts...
Function Starts... vector_table:a0000000
Function Starts... sp_base:20018000
Function Starts... pc_func:a0000415

but main code can not start.

when i put bootloader code and main code into lpc's internal flash memory. after bootloader , main code is works.

Then i tested second things.

wrote some dummy data to external sd ram into bootloader. then i can read it again into main code.

is there any missing to work code form external sdram?

Re: lpc54607 Running Application on external ram

carstengroen — Wed, 05 Jan 2022 16:20:23 GMT

You need to allow "instruction fetch" in the MMU for the external SDRAM:

(Note, in my case below I use area 0xA0200000 and forward, you need to adjust that to fit your application)

  // Set up MPU:
  //  - Region 0: 0xA0200000 - 0xA0300000 --- SDRAM memory
  //              + Size: 1MB
  //              + XN=0: enable instruction fetch
  //              + AP=b011: full access
  //              + TEX=0, S=1, C=1, B=1
  //
  MPU->RNR = 0;//indicate MPU region 0
  MPU->RBAR = 0xA0200000; // update the base address for region 0
  MPU->RASR = 0x03070026 | 0x00000001;
  MPU->CTRL =(1<<0) | (1<<2) ; // Enable the MPU and enable default memory map

Re: lpc54607 Running Application on external ram

xiangjun_rong — Thu, 06 Jan 2022 05:46:43 GMT

Hi,

If you run an api function in SRAMX, it is okay.

But if you want to run an api function in external SDRAM, you have to initialize MPU module as Mr Carsten Groen said.
I attach an application note which tell you how to run code in SDRAM.

Hope it can help you

XiangJun Rong

Re: lpc54607 Running Application on external ram

omeraygor — Mon, 17 Jan 2022 12:42:22 GMT

Hi again, soory late return. coz i moved my office.

and happy endings..

SPIFI flash dma started
Usart functional API interrupt example
Board receives characters then sends them out
Now please input:
EEPROM init is OK.
File size is 16872.
BOOTLOADER file is OK.
Function Starts...
Function Starts... vector_table:a0000000
Function Starts... sp_base:20018000
Function Starts... pc_func:a0000415
Main Bootloader Data:.
MAIN CODE WORKS

thanks. for yor help.

what i done;

MPU->RNR = 0; //Region number 0
MPU->RBAR = 0xA0000000;//Region base address
/* Full Access | TEX: 000 | S: 0 | C: 0 | B:0 (No cacheable, no shareable)| 1M SIZE | ENABLE */
MPU->RASR = (0 << 28) | (0x3 << 24) | (0x0 << 19) | (0 << 18) | (0 << 17) | (0 << 16) | (0xFF < | (0x13 << 1) | (1 << 0); //Region
//size and enable
MPU->CTRL = MPU_CTRL_ENABLE_Msk | MPU_CTRL_PRIVDEFENA_Msk;

i added this lines as you said to my code before start main code into bootloader.

my bootloader sct file is:

#define m_interrupts_start 0x00000000 #define m_interrupts_size 0x00000400 #define m_text_start 0x00000400 #define m_text_size 0x0001A000 #define m_data_start 0x20000000 #define m_data_size 0x00018000 #define m_usb_sram_start 0x40100000 #define m_usb_sram_size 0x00002000

and my main code sct file is:

#define m_interrupts_start 0xA0000000 #define m_interrupts_size 0x00000400 #define m_text_start 0xA0000400 #define m_text_size 0x0007FC00 #define m_data_start 0x20000000 #define m_data_size 0x00018000 #define m_usb_sram_start 0x40100000 #define m_usb_sram_size 0x00002000