I have the following error on compile, and would like to get an explanation of what it means, and how to fix it. (obviously, I am a newbie, lost in the woods!)
error: variable 'logo16_glcd_bmp' must be const in order to be put into read-only section by means of 'attribute((progmem))'
attached is a .png capture...
Have you tried using the keyword "const"?
Please post code, not pictures.
Yes, I have have read the definition, but not having much experience and no training, it's a slow learning process and over my head at this point. I would like to get a bit of help solving problems with this app, so that I can continue this project as I learn, rather than spending days, weeks or months studying before I can get something going. This is not code I have written, but what has supposedly been used by many others, and I assumed that it works. Apparently there are problems with the libraries associated, (http://s4.electrodragon.com/wp-content/uploads/2012/01/SSD1306.zip).
Here is the sketch code:
#define OLED_DC 11
#define OLED_CS 12
#define OLED_CLK 10
#define OLED_MOSI 9
#define OLED_RESET 13
#include <SSD1306.h>
SSD1306 oled(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2
#define LOGO16_GLCD_HEIGHT 16
#define LOGO16_GLCD_WIDTH 16
static unsigned char attribute ((progmem)) logo16_glcd_bmp[]={
0x30, 0xf0, 0xf0, 0xf0, 0xf0, 0x30, 0xf8, 0xbe, 0x9f, 0xff, 0xf8, 0xc0, 0xc0, 0xc0, 0x80, 0x00,
0x20, 0x3c, 0x3f, 0x3f, 0x1f, 0x19, 0x1f, 0x7b, 0xfb, 0xfe, 0xfe, 0x07, 0x07, 0x07, 0x03, 0x00, };
void setup() {
Serial.begin(9600);
// If you want to provide external 7-9V VCC, uncomment next line and comment the one after
//oled.ssd1306_init(SSD1306_EXTERNALVCC);
// by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
oled.ssd1306_init(SSD1306_SWITCHCAPVCC);
// init done
oled.display(); // show splashscreen
delay(2000);
oled.clear(); // clears the screen and buffer
// Fill screen
oled.fillrect(0, 0, SSD1306_LCDWIDTH-1, SSD1306_LCDHEIGHT-1, WHITE);
oled.display();
delay(2000);
// draw a single pixel
oled.setpixel(10, 10, WHITE);
oled.display();
delay(2000);
oled.clear();
// draw many lines
testdrawline();
oled.display();
delay(2000);
oled.clear();
// draw rectangles
testdrawrect();
oled.display();
delay(2000);
oled.clear();
// draw multiple rectangles
testfillrect();
oled.display();
delay(2000);
oled.clear();
// draw mulitple circles
testdrawcircle();
oled.display();
delay(2000);
oled.clear();
// draw a white circle, 10 pixel radius, at location (32,32)
oled.fillcircle(32, 32, 10, WHITE);
oled.display();
delay(2000);
oled.clear();
// draw the first ~12 characters in the font
testdrawchar();
oled.display();
delay(2000);
oled.clear();
// draw a string at location (0,0)
oled.drawstring(0, 0, "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation");
oled.display();
delay(2000);
oled.clear();
// miniature bitmap display
oled.drawbitmap(30, 16, logo16_glcd_bmp, 16, 16, 1);
oled.display();
// invert the display
oled.ssd1306_command(SSD1306_INVERTDISPLAY);
delay(1000);
oled.ssd1306_command(SSD1306_NORMALDISPLAY);
delay(1000);
// draw a bitmap icon and 'animate' movement
testdrawbitmap(logo16_glcd_bmp, LOGO16_GLCD_HEIGHT, LOGO16_GLCD_WIDTH);
}
void loop()
{
for (uint8_t i=0; i<SSD1306_LCDWIDTH; i++) {
for (uint8_t j=0; j<SSD1306_LCDHEIGHT; j++) {
oled.setpixel(i, j, WHITE);
oled.display();
}
}
}
void testdrawbitmap(const uint8_t *bitmap, uint8_t w, uint8_t h) {
uint8_t icons[NUMFLAKES][3];
srandom(666); // whatever seed
// initialize
for (uint8_t f=0; f< NUMFLAKES; f++) {
icons[f][XPOS] = random() % SSD1306_LCDWIDTH;
icons[f][YPOS] = 0;
icons[f][DELTAY] = random() % 5 + 1;
Serial.print("x: ");
Serial.print(icons[f][XPOS], DEC);
Serial.print(" y: ");
Serial.print(icons[f][YPOS], DEC);
Serial.print(" dy: ");
Serial.println(icons[f][DELTAY], DEC);
}
while (1) {
// draw each icon
for (uint8_t f=0; f< NUMFLAKES; f++) {
oled.drawbitmap(icons[f][XPOS], icons[f][YPOS], logo16_glcd_bmp, w, h, WHITE);
}
oled.display();
delay(200);
// then erase it + move it
for (uint8_t f=0; f< NUMFLAKES; f++) { oled.drawbitmap(icons[f][XPOS], icons[f][YPOS], logo16_glcd_bmp, w, h, BLACK); // move it icons[f][YPOS] += icons[f][DELTAY]; // if its gone, reinit if (icons[f][YPOS] > SSD1306_LCDHEIGHT) {
icons[f][XPOS] = random() % SSD1306_LCDWIDTH;
icons[f][YPOS] = 0;
icons[f][DELTAY] = random() % 5 + 1;
}
}
}
}
void testdrawchar(void) {
for (uint8_t i=0; i < 168; i++) {
oled.drawchar((i % 21) * 6, i/21, i);
}
}
void testdrawcircle(void) {
for (uint8_t i=0; i<SSD1306_LCDHEIGHT; i+=2) {
oled.drawcircle(63, 31, i, WHITE);
}
}
void testdrawrect(void) {
for (uint8_t i=0; i<SSD1306_LCDHEIGHT; i+=2) {
oled.drawrect(i, i, SSD1306_LCDWIDTH-i, SSD1306_LCDHEIGHT-i, WHITE);
}
}
void testfillrect(void) {
for (uint8_t i=0; i<SSD1306_LCDHEIGHT; i++) {
// alternate colors for moire effect
oled.fillrect(i, i, SSD1306_LCDWIDTH-i, SSD1306_LCDHEIGHT-i, i%2);
}
}
void testdrawline() {
for (uint8_t i=0; i<SSD1306_LCDWIDTH; i+=4) {
oled.drawline(0, 0, i, SSD1306_LCDHEIGHT-1, WHITE);
oled.display();
}
for (uint8_t i=0; i<SSD1306_LCDHEIGHT; i+=4) {
oled.drawline(0, 0, SSD1306_LCDWIDTH-1, i, WHITE);
oled.display();
}
delay(1000);
for (uint8_t i=0; i<SSD1306_LCDWIDTH; i+=4) {
oled.drawline(i, SSD1306_LCDHEIGHT-1, 0, 0, BLACK);
oled.display();
}
for (uint8_t i=0; i<SSD1306_LCDHEIGHT; i+=4) {
oled.drawline(SSD1306_LCDWIDTH - 1, i, 0, 0, BLACK);
oled.display();
}
}
Thanks,
Roger
C'mon Roger. 11 posts? You must know by now that you post code using code tags?
The error message is telling you that you need to make 'logo16_glcd_bmp' const. Do a search for the words 'progmem' and 'const'.
// static unsigned char __attribute__ ((progmem)) logo16_glcd_bmp[]={
const unsigned char logo16_glcd_bmp[] __attribute__ ((progmem)) ={
or
const unsigned char logo16_glcd_bmp[] PROGMEM ={
Sorry, I am not familiar with "code tags"... please explain.
Thanks,
Roger
Use icon for "code" to post code to be better readable as above in my post.
EDIT:
@dannable: Sorry for meddle in. 
@Budvar10 - Don't worry about it. Two answers are better than none!
@Budvar10 - Thanks for the code fix This gives me an entry point to learn by doing/analyzing.
@dannable - Thanks for the code tag info... I missed/forgot that from when I joined the group.
I self learned Basic and 8080 assembler back around 1980 on a Heathkit H-8, and fooled around a bit with that for a few years, but have been out of it since. Arduino, C & C++ are new and foreign to me at this point. I am intrigued by the Arduino and small embedded apps, and thank you for your patience...
Thanks,
Roger