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Move statics into LCDDisplay class, and reduce RAM.

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Some state variables were static in LCDDisplay.write().  Moved to class members.  Also, types of data items like row, column & character position changed to int8_t to save a few bytes of RAM.
This commit is contained in:
Neil McKechnie 2021-02-19 15:32:30 +00:00
parent c5ddbdf8d7
commit 3327c043a1
2 changed files with 19 additions and 19 deletions
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19
LCDDisplay.cpp
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@ -46,20 +46,13 @@ size_t LCDDisplay::write(uint8_t b) {
LCDDisplay *LCDDisplay::loop2(bool force)
{
static int rowFirst = -1;
static int rowNext = 0;
static int charIndex = 0;
static char buffer[MAX_LCD_COLS+1];
static char *bptr = 0;
static bool done = false;
unsigned long currentMillis = millis();
if ((!force) && (currentMillis - lastScrollTime) < LCD_SCROLL_TIME)
return NULL;
do {
if (bptr == 0) {
if (bufferPointer == 0) {
// Find a line of data to write to the screen.
if (!done) {
if (rowFirst < 0) rowFirst = rowNext;
@ -74,26 +67,26 @@ LCDDisplay *LCDDisplay::loop2(bool force)
}
if (!done) {
// Non-blank line found, so copy it.
for (int i=0; i<MAX_LCD_COLS+1; i++)
for (uint8_t i=0; i<sizeof(buffer); i++)
buffer[i] = rowBuffer[rowNext][i];
} else
buffer[0] = '\0'; // Empty line
setRowNative(slot); // Set position for display
charIndex = 0;
bptr = &buffer[0];
bufferPointer = &buffer[0];
} else {
// Write next character, or a space to erase current position.
char ch = *bptr;
char ch = *bufferPointer;
if (ch) {
writeNative(ch);
bptr++;
bufferPointer++;
} else
writeNative(' ');
if (++charIndex >= MAX_LCD_COLS) {
// Screen slot completed, move to next one
slot++;
bptr = 0;
bufferPointer = 0;
if (!done) {
rowNext = (rowNext + 1) % MAX_LCD_ROWS;
if (rowNext == rowFirst) done = true;

19
LCDDisplay.h
View File

@ -52,12 +52,19 @@ class LCDDisplay : public Print {
void writeNative(char b);
unsigned long lastScrollTime=0;
int hotRow=0;
int hotCol=0;
int topRow=0;
int lcdRows;
int lcdCols;
int slot=0;
int8_t hotRow=0;
int8_t hotCol=0;
int8_t topRow=0;
int8_t lcdRows;
int8_t lcdCols;
int8_t slot=0;
int8_t rowFirst=-1;
int8_t rowNext=0;
int8_t charIndex = 0;
char buffer[MAX_LCD_COLS+1];
char *bufferPointer = 0;
bool done = false;
void renderRow(byte row);
char rowBuffer[MAX_LCD_ROWS][MAX_LCD_COLS+1];
};