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Results tagged with progmem
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user 4143
PROGMEM is a keyword used when declaring a variable that keeps the data in flash instead of copying it into SRAM. It is part of the `pgmspace.h` library. Use this tag for discussions about using this attribute.
3
votes
Accepted
How is a 41KB char array filling up 256KB of program memory?
The limitation here is the data type of the index of the array. That is int, and on an 8-bit system an int can hold a value in the range -32768 to 32767.
That means the biggest index number an array …
- 106k
4
votes
Accepted
Read nested array item from PROGMEM
The library, as it stands, doesn't support direct sending from PROGMEM. However it's not too hard to get around that - if your C++ is up to it. … You just need to do the same thing to create a new class that implements the functions in a way that can read from PROGMEM. …
- 106k
1
vote
i am working on a project smart watch i am getting this error please help
PROGMEM is in the wrong loctaion. … const dataType variableName[] PROGMEM = {}; // use this form
const PROGMEM dataType variableName[] = {}; // or this form
const dataType PROGMEM variableName[] = {}; // not this one
And I will …
- 106k
2
votes
Accepted
How do I upload sketch (and parameters) through a user interface
I guess that is the time to write to PROGMEM: if there is a running sketch I cannot do it, am I right?
When you upload a new sketch you are writing to PROGMEM. … Yes, there are ways you can write pages of data to PROGMEM, and that's exactly what the bootloader does when you upload a sketch, but manipulating individual variables in PROGMEM is not possible without …
- 106k
0
votes
Accepted
ESP8266 compilation error: "previous declaration of 'HTTPMethod HTTP_HEAD'"
You need a newer version of the WiFiManager.h library. This issue was fixed August last year.
- 106k
2
votes
Accepted
How to create large progmem arrays and not annoy the linker
For example, in the header file you would declare your constant:
extern const char foo[] PROGMEM;
And in your source file define the constant:
#include "foo.h"
const char foo[] PROGMEM = {0xDE,0xAD …
- 106k
2
votes
Accepted
Use of progmem in ESP8266 vs AVR and also how to handle large dynamic strings
Anything that you don't specify as PROGMEM will get copied into dram0. Note that you don't get all 80kB of the RAM to play with since the SDK uses a portion of it. … So to summarise: Not using PROGMEM gives you fast access to your string data at the cost of RAM, and limits the size of the data you can use. …
- 106k
2
votes
PROGMEM on Arduino Due (ARM Cortex M3)
There is no PROGMEM required on ARM. There is no memory bus separation between Flash and RAM, so it doesn't copy constants from flash to RAM which PROGMEM is used to prevent. …
- 106k
3
votes
Inherent delay running EEPROM.read()
I think PROGMEM plays a role here and I'm looking at examples oh how other sketched employ PROGMEM to better understand how to use it.
No, it doesn't. … PROGMEM is for storing strings and other data within your sketch. It has nothing at all to do with EEPROM. …
- 106k