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18 Threads found on Rom Variable
Not clear what you want to achieve. Your memory allocation for arrays or strings will be static, according the maximum size used during run time. In any case you are restricted to legal C syntax, additionally need to consider the limited rom and RAM resources of a small 8051 microcontroller. If you have difficulties to implement legal C cons
An intelligent control of a GSM module requires to receive and decode command responses, did you consider it? To start bottom-up, design Tx and optionally Rx UARTs, design a state machine that replays predefined strings from a rom, if necessary inserting variable fields. Optionally design a decoder for responses, e.g. OK, ERROR, >, if (...)
I am using XC8 Compiler with PIC18F4550, i want to know some basic questions how compiler actually works when we declare a variable. When i compile the program:- #include void main() { } My Memory Usage is this. 102496 when i use the following code #include
Hello there, the following it is the code i am using from Mikrobasic tutorials and i have adapted it to work on PIC16F676 but it cannot work. Each time keeps telling me there is not enough rom space. What am i doing wrong?. It seems Mikrobasic consumes a lot from microcontroller memory. Is there anyway to bypass this?. Thanks. [COD
Sometimes we call flash a rom but what it is actually is a non volatile memory which means that the content is preserved when power supply is removed. - - - Updated - - - - Updated - - - The IDE stores everything in rom (unless there are some va
hello i had to store array in the rom cause it took alot of memory space in the Ram and now i wanna change the array element while its being saved in the rom or call it in ram element by element to change it how i do that? and thx in advance
Haven't used Acel DSP myself, so I cannot help on that. But, it is not that hard to create a rom in VHDL. Below is coding template in VHDL I found in ISE. library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; entity rams_21b is port (CLK : in std_logic; EN : in std_logic; ADDR : in std_logic_vector(5 downto 0);
You can't store 'variables' in any kind of rom. If it's a table of data that never changes, it's a constant array so try declaring it as "const unsigned char wave = ...". Which should telll the compiler it can safely be stored in permanent (rom) memory. Brian.
Generaly it is due the libraries that the compiler is linking, much of the times the redundant (unnecessary) code is linked (rom) together with variable space requirement (RAM)
1 : A value can be stored in Flash (program memory ) but it will not be a variable but a constant. technically a variable is stored in RAM. in C there is a keyword "rom" that tells the compiler to store a value in rom. some compilers use longer keywords like "static const rom char" ; If (...)
To generate sine wave of a fixed frequency(Fout), then you just load sine wave samples in to rom and read them with a sampling clock(Fclk). Fout = Fclk/Number of samples.
I'm trying to backannotate SDF into a compiled rom. The verilog for this rom has the following timing variable: $setuphold. The SDF out of primetime has $SETUP and $HOLD. When I run ncverilog I get a bunch of the following errors: I'm sure that PT has a way to write a combined SETUPHOLD check though I did not check
const rom int pwm_ref= {0,8,17,25,33,42}; rom : it says the compiler that the array allocated in program memory, not data memory. if you omit "rom", the variable allocated in data mem. int: each number in array has 16-bit wide. use "int" even the number is 8-bit. Because it generates more compact code after compile. (...)
May be your compiler does not support pointers to rom like CCS one for example. You'd better check this
This is rom the C51 manual: 3 Explicitly Declared Memory Types By including a memory type specifier in the variable declaration, you may specify where variables are stored. The following table summarizes the available memory type specifiers. Memory Type Description code Program memory (64 KBytes); accessed by opcode MOVC @A+DPTR. (...)
Can a variable be used as an index of an array while synthesizing memories RAM or rom and other subtypes; for example --code "variable0 (var1 downto var2 );" where var1 and var 2 are integer subtype and variable0 is std_logic_vector ( some_constant downto 0) while synthesis error comes is "Error, left bound (...)
I use HI-Tech PICC compiler and i need read the address of const variable const char Data = {0x15,0x18,0xAC}; i want change the data and save it in the flash How could i read flash address Thank You
Service mode functions NVRAM initialization/cold reset NVRAM initializer sets all default variables stored in NVRAM back to factory default values or to a default rom value, depending on the variable. It also performs a system reset. NVRAM initializer resets the following: ! all menu settings to factory default values ! factory (...)