CC2541: CC2541 difference between Logical address, Physical address and its mapping

Vishnu Beema

Other Parts Discussed in Thread: CC2541, CC2540

art Number: CC2541

Hello,

I have gone through couple of threads on writing Flash memory.

Bit confused with 8051 CPU flash of 64K Bytes, CC2541 flash size of 256K bytes, Banks 0 - 7, Pages 0 - 127, Logical address, Actual/Physical address, 32K Flash occupying XDATA etc..

User guide is not clear about mapping. Below are the links I was going through.

http://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/319364

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/p/279926/977092#977092

Is there any table mapping between all these.

I was going through IAR memory map.

There is a gap between first 64K and next 32K. Later on every alternative 32K does not have code. Why is this. Trying to understand the concept behind this.

Thanks & Regards

Vishnu Beema

over 6 years ago

0 Fredrik K over 6 years ago

TI__Guru** 106705 points

Hi Vishnu,

The memory addressing is documented in the CC253x/4x User´s Guide.

Regards,
Fredrik

0 Vishnu Beema over 6 years ago in reply to Fredrik K

Expert 1450 points

Hi Fredrik,

As mentioned, even I gone through User guide section 2.2 and 6. But I am not able to map between Logical address and Physical address.

0 Fredrik K over 6 years ago in reply to Vishnu Beema

TI__Guru** 106705 points

Hi Vishnu,

What is the actual problem? Are you having functional issues with the device?

Regards,
Fredrik

0 Vishnu Beema over 6 years ago in reply to Fredrik K

Expert 1450 points

I want to use HalFlashWrite(). Trying to understand the address to be passed. Is this Logical address or Physical address. How they are mapped.

0 Vishnu Beema over 6 years ago in reply to Vishnu Beema

Expert 1450 points

Hi Fredrik,

Below is the sample code I am trying to do in SimpleBLEPeripheral_Main.c (SimpleBLEPeripheral project). But I am not able to see any data written in CC2540.

int main(void)
{
/* Initialize hardware */
HAL_BOARD_INIT();

// Initialize board I/O
InitBoard( OB_COLD );

/* Initialze the HAL driver */
HalDriverInit();

/* Initialize NV system */
osal_snv_init();

/* Initialize LL */

/* Initialize the operating system */
osal_init_system();

/* Enable interrupts */
HAL_ENABLE_INTERRUPTS();

// Final board initialization
InitBoard( OB_READY );

#if defined ( POWER_SAVING )
osal_pwrmgr_device( PWRMGR_BATTERY );
#endif

/*--------------------------------------------------------------------------------------------------------------*/
{
uint32 u32Data[100] = {0};
uint32 addr = (126u * 2048u); // Trying to write 400 bytes at Page 126
uint16 addr1 = (addr / 4);

memset( (void*) &u32Data[0], 0x11, 400);
HalFlashWrite(addr1 , (uint8*) &u32Data, 100);

uint32 u32Data1 = 0xAABBCCDD;
addr = ((127u * 2048u) / 4); // Trying to write 4 bytes at Page 127
HalFlashWrite(addr , (uint8*) &u32Data1, 1);
}
/*--------------------------------------------------------------------------------------------------------------*/

/* Start OSAL */
osal_start_system(); // No Return from here

return 0;
}

Since I am using Page 126 and 127 (CC241 has 128 pages, 128 * 2048 = 256K), I saw memory in the range 0x78000 to 0x7FFFF. All are 0xFF.
Please let me know where to look into Flash location and in IAR workbench memory window.

Thanks & Regards
Vishnu Beema

0 Vishnu Beema over 6 years ago in reply to Vishnu Beema

Expert 1450 points

Hello,

To avoid all these confusions, I prepared Excels sheet.

This will give clear picture of 8051 Physical address, CC2540/41 256K Physical address and Logical address with Paging and BankCC2540_Memory_Analysis.xlsx.

Thanks & Regards

Vishnu Beema

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CC2541: CC2541 difference between Logical address, Physical address and its mapping