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Fixed PROGMEM example, and updated for modern IDE. #20

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Aug 28, 2017
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Fixed PROGMEM example, and updated for modern IDE. #20

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7 changes: 2 additions & 5 deletions Language/Variables/Utilities/PROGMEM.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ Store data in flash (program) memory instead of SRAM. There's a description of t

The `PROGMEM` keyword is a variable modifier, it should be used only with the datatypes defined in pgmspace.h. It tells the compiler "put this information into flash memory", instead of into SRAM, where it would normally go.

PROGMEM is part of the http://www.nongnu.org/avr-libc/user-manual/group__avr__pgmspace.html[pgmspace.h] library. So you first need to include the library at the top your sketch, like this:
PROGMEM is part of the http://www.nongnu.org/avr-libc/user-manual/group__avr__pgmspace.html[pgmspace.h] library. It is included automatically in modern versions of the IDE, however if you are using an IDE version below 1.0 (2011), you'll first need to include the library at the top your sketch, like this:

`#include <avr/pgmspace.h>`
[%hardbreaks]
Expand Down Expand Up @@ -58,9 +58,6 @@ The following code fragments illustrate how to read and write unsigned chars (by

[source,arduino]
----
#include <avr/pgmspace.h>


// save some unsigned ints
const PROGMEM uint16_t charSet[] = { 65000, 32796, 16843, 10, 11234};

Expand All @@ -86,7 +83,7 @@ void setup() {
Serial.println();

// read back a char
for (k = 0; k < strlen(signMessage); k++)
for (k = 0; k < strlen_P(signMessage); k++)
{
myChar = pgm_read_byte_near(signMessage + k);
Serial.print(myChar);
Expand Down