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1. How to use non volatile variable in keil mdk arm software#
2. How to use non volatile variable in keil mdk arm code#

See AN89610 - PSoC® 4 and PSoC 5LP ARM Cortex Code Optimization to understand how this can be done for PSoC 4 or PSoC 5LP with the GCC or MDK compiler. Using the Keil Microcontroller Prototyping System to develop an ARM Cortex-M class processor-based system The increasing use of the ARM Cortex-M class processors in microcontrollers and embedded applications, together with the diversity of the processors within the family, requires a simple system to aid evaluation and prototyping. Function in an absolute location of flash.Initializing the variable placed in an absolute location of SRAM or flash.

How to use non volatile variable in keil mdk arm software#

download the free unlicensed version of the MDK-ARM software to use on your. The frequency calculation depends on several variables, so it’s ideal to check the values in an emulator first and refine the system if necessary. The following features are not possible with the PSoC 3 Keil compiler: The Nucleo works with the industry-standard Keil Microcontroller Development. Here’s a basic graphical explanation Note the output of the variables (the duty cycle and frequency) in the emulator of Keil’s ARM IDE. This section is used for variables that are not initialized.įor example, the following code places the variable foo in the. PSoC Creator also provides a convenient macro CY_NOINIT, which places a variable in the. Place the Linker command under Project > Build Settings > DP8051 Keil 9.51 > Linker > Command Line (SE(?CO?MAIN(C:0X5A5A)) (See Figure 1) Here, MAIN indicates the name of the file in which the constant is used (main.c) and 0x5A5A is the relative flash location (absolute flash location with respect to the memory map would be 0x01005A5A).įigure 1 Linker Command for placing constant at absolute flash location.The following example places the integer variable “myVariable” with a constant value of 1000 in flash.įollow the steps mentioned below to place a constant at an absolute flash location: is the constant value to be stored in the variable. Local or global constant variables may be located at flash memory locations in your C code using the CYCODE or const keyword. To place a constant in flash at any address in PSoC 3 (Keil Compiler), please follow these steps: The following example places an integer variable in xdata (the default) at location 0x1000. If excluded, the default memory type is used.Ĭonstant is the address where the variable is to be located. Memory_type is the memory type, e.g., idata or xdata. Just for reference, PSoC 5 is based on a Cortex-M3. That is a CPU performance of 67x compared to the original 80C51 running at 12 MHz with 12 cycles / intruction. To place a variable in an absolute location of SRAM in PSoC 3 (Keil compiler), follow these steps:Īutomatic (local) and global variables can be located at absolute memory locations in your C code by using the _at_ keyword. In case somebody does not know, PSoC 3 is based on a C51 core that runs in single cycle execution up to 67 MHz. How do you place a function or a variable at an absolute memory section (in SRAM or flash) in PSoC 3, PSoC 4, and PSoC 5LP, with the Keil, GNU Compiler Collection (GCC), and Microcontroller Development Kit (MDK) compilers?