Using GNU ld this presents a massive problem: two areas to populate with code and data and a big, greasy configuration section slap-bang between them. Welcome to legacy, I’m looking at you MSP430X… The GNU way (or, in fact, the old way) Over time code grows and no longer fits, a bigger device is placed on the board, but legacy production and field updates means that the configuration area must remain in its original position: now plumb in the middle of the flash area. The first page of flash is typically used for exception vectors and can’t be used, so engineers invariably choose the final one or two pages to have the maximum contiguous linear address space for code and read-only data. Let’s take a typical example where some flash is defined as a configuration area. Some microcontrollers have their flash programmed with calibration values at the factory which should not be erased some have flash security keys at the start of a flash page and some applications just need to keep out of configuration areas that are programmed during device production and test. So, let’s dive right in and show what the SEGGER linker can do! Flowing code around a configuration area When the rubber hits the road, having a capable linker rather than a make-do linker really can make all the difference to a project. Using the GNU linker is just challenging: it’s too inflexible in its placement model and link-editor scripting language.
Placing items at fixed memory addresses is a mind-bending puzzle that percolates up into source code.features to flow code and data over multiple RAM or flash regions whilst keeping away from configuration areas and adding a CRC is nonexistent.Unfortunately, the GNU linker really doesn’t help when developing embedded systems: When this happens, figuring out where you can trim the application and where your RAM is spent becomes important. If the end product has an extended life with regular updates then feature creep tends to make the firmware expand to fill all available space. Linking for bare-metal embedded systems swaps shared library baggage for the problem of fitting an application into a small microcontroller with a multitude of memory regions.
#Segger embedded studio gcc linker script windows
Simple, yes?įor host systems, such as Windows and Linux, linking is conceptually straightforward but has complexity baked-in for versioning, ABI compatibility, and shared libraries / DLLs, and so on. The linker is the most unglamorous part of a development environment: it acts to stitch the program together from all the separately-compiled sources, and prepare it for execution. However, this version is not yet released, it’s tentatively scheduled to happen sometime this month (Oct 2017), as we would like to use it internally first, to “get some hours on it”. The SEGGER linker is now integrated into Embedded Studio, our premier development environment, and has been tested for compatibility with Embedded Studio and Ozone, the J-Link debugger. A follow-up post will examine more of the linker’s capabilities. In this post I examine the gnarly problems with the GNU linker and how they are easily solved by the SEGGER linker. I don't really kno where to look as i'm not sure why this error could possibly pop up.In the previous post, Rolf described some of the progress that we have made on the brand-new SEGGER linker. this file is in de same directory as ds_twr_responder.c along with app_uart.c (in which the function is defined) Going to the declaration of the function brigs us to app_uart.h. The error is, according to SEGGER Embedded Studio, in my ds_twr_responder.c file pointing to the function call APP_UART_FIFO_INIT(&com_params, UART_RX_BUFF_SIZE, UART_TX_BUFF_SIZE, uart_err_handle, APP_IRQ_PRIORITY_LOWEST, err_code) #define APP_UART_FIFO_INIT(P_COMM_PARAMS, RX_BUF_SIZE, TX_BUF_SIZE, EVT_HANDLER, IRQ_PRIO, ERR_CODE) \ĮRR_CODE = app_uart_init(P_COMM_PARAMS, &buffers, EVT_HANDLER, IRQ_PRIO) \ I pinpointed the error (I think at least) to the following piece of code in a file named app_uart.h the problematic functions gets called in the second last line of the following code block: uint32_t app_uart_init(const app_uart_comm_params_t * p_comm_params, I'm now trying to port the uart example to the two way ranging example to send the results to an external device but keep running into the following error: I'm quite new to C but managed to get desired results using and changing the examples. I'm doing some experiments with the nRF52840 and SEGGER Embedded Studio.
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