Hello @rhsalced
- You can refer to this thread:
https://community.nxp.com/t5/LPC-Microcontrollers/LPC54018JxM-debugging-internal-flash-example-for-K...
It introduces lpc54018 + QSPI flash + KEIL.。
- 1. If the default selected Flash download algorithm file is not applicable to your board, then you need to provide a suitable algorithm file (.FLM) yourself and place it in the MDK installation directory (\Keil_v5\ARM\Flash). Then, reopen the project options, and the newly added algorithm will be automatically refreshed into the list of selectable algorithms.
2. After obtaining the appropriate download algorithm file, you finally need to check two address ranges. One is the actual mapped address space corresponding to the Flash, and the other is the running RAM address space of the download algorithm file.
3. NOR Flash Download Algorithm Design
The Flash download algorithm under Keil MDK is open-source and comes with relatively detailed documentation. The documentation can be found on the GitHub homepage of arm-software. Based on these documents, we can basically understand the design details of its download algorithm.
Algorithm Homepage:
3.1 Download Algorithm Template Project
Keil MDK provides a basic template project for the Flash download algorithm. The project is located at \Keil_v5\ARM\Flash_Template\NewDevice.uvprojx. This project can only be compiled using MDK (not supported by MDK-Lite). In addition to the project settings, this template project only contains four files:
\Keil_v5\ARM\Flash\FlashOS.h
\Keil_v5\ARM\Flash_Template\FlashDev.c
\Keil_v5\ARM\Flash_Template\FlashPrg.c
\Keil_v5\ARM\Flash_Template\Target.lin
After obtaining the basic template project, we need to change the default ARMCM0 core in the project options according to the type of the target MCU core. Then, we need to implement all the algorithm API functions in FlashDev.c and FlashPrg.c (they are empty by default). Finally, compile the project to generate the.FLM file, which is the algorithm file we need (in fact, the final.FLM file is obtained by directly renaming the.axf file through the script command in After Build. The.FLM file is essentially an axf format file).
3.2 Download Algorithm Structure Design
The structure of the algorithm itself is actually very simple. In the FlashDev.c file, there is a constant structure named FlashDevice, and its prototype is defined in FlashOS.h. This structure mainly provides the necessary Flash information for the IDE, and its values must be filled in correctly according to the actual situation of the board.
struct FlashDevice const FlashDevice = {
FLASH_DRV_VERS, // Driver Version, do not modify!
"New Device 256kB Flash", // Device Name
ONCHIP, // Device Type
0x00000000, // Device Start Address
0x00040000, // Device Size in Bytes (256kB)
1024, // Programming Page Size
0, // Reserved, must be 0
0xFF, // Initial Content of Erased Memory
100, // Program Page Timeout 100 mSec
3000, // Erase Sector Timeout 3000 mSec
// Specify Size and Address of Sectors
0x002000, 0x000000, // Sector Size 8kB (8 Sectors)
0x010000, 0x010000, // Sector Size 64kB (2 Sectors)
0x002000, 0x030000, // Sector Size 8kB (8 Sectors)
SECTOR_END
};
In addition to FlashDevice, the most core part is of course the seven API functions in FlashPrg.c. These API functions provide the actual functions of Flash erasing, programming, and verification. The IDE will automatically call these APIs as needed to achieve online downloading. The prototypes of these APIs are fixed, but the specific function implementations vary depending on the board.
There is also a design of the algorithm project that has to be mentioned, that is, both Read-Only Position Independent and Read-Write Position Independent are checked under the project options C/C++ (including Asm). This indicates that the download algorithm itself is not linked using a fixed address, but is a position-independent link (also called a relative address link). The machine code of the algorithm code can be executed at any address, which is why you can specify the RAM for Algorithm in the example options.
BR
Alice
