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Move lookup tables into SRAM
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@bigjosh
bigjosh committed Nov 30, 2013
1 parent e504f0c commit 82ca537
Showing 1 changed file with 10 additions and 11 deletions.
21 changes: 10 additions & 11 deletions Atmel Studio/Candle0005.c
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Original file line number Original file line Diff line number Diff line change
Expand Up @@ -265,13 +265,13 @@ static inline void nextFrame(void) {


static byte const rowDirectionBits = 0b01010101; // 0=row goes low, 1=Row goes high static byte const rowDirectionBits = 0b01010101; // 0=row goes low, 1=Row goes high


PROGMEM static byte const portBRowBits[ROWS] = {_BV(0),_BV(0),_BV(2),_BV(2),_BV(4),_BV(4),_BV(6),_BV(6) }; static byte const portBRowBits[ROWS] = {_BV(0),_BV(0),_BV(2),_BV(2),_BV(4),_BV(4),_BV(6),_BV(6) };
PROGMEM static byte const portDRowBits[ROWS] = { 0, 0, 0, 0, 0, 0, 0, 0 }; static byte const portDRowBits[ROWS] = { 0, 0, 0, 0, 0, 0, 0, 0 };


// Note that col is always opposite of row so we don't need colDirectionBits // Note that col is always opposite of row so we don't need colDirectionBits


PROGMEM static byte const portBColBits[COLS] = {_BV(7),_BV(5),_BV(3), _BV(1), 0}; static byte const portBColBits[COLS] = {_BV(7),_BV(5),_BV(3), _BV(1), 0};
PROGMEM static byte const portDColBits[COLS] = { 0, 0, 0, 0,_BV(6)}; static byte const portDColBits[COLS] = { 0, 0, 0, 0,_BV(6)};




#define REFRESH_PER_FRAME ( REFRESH_RATE / FRAME_RATE ) // How many refreshes before we trigger the next frame to be drawn? #define REFRESH_PER_FRAME ( REFRESH_RATE / FRAME_RATE ) // How many refreshes before we trigger the next frame to be drawn?
Expand Down Expand Up @@ -304,9 +304,9 @@ static inline void refreshScreenClean(void)


for( byte int_y = 0 ; int_y < FDA_Y_MAX ; int_y++ ) { for( byte int_y = 0 ; int_y < FDA_Y_MAX ; int_y++ ) {


byte portBRowBitsCache = pgm_read_byte_near(portBRowBits+int_y); byte portBRowBitsCache = portBRowBits[int_y];


byte portDRowBitsCache = pgm_read_byte_near(portDRowBits+int_y); byte portDRowBitsCache = portDRowBits[int_y];


for( byte int_x = 0 ; int_x < FDA_X_MAX ; int_x++) { for( byte int_x = 0 ; int_x < FDA_X_MAX ; int_x++) {


Expand All @@ -331,14 +331,14 @@ static inline void refreshScreenClean(void)


// Only need to set the correct bits in PORTB and PORTD to drive the row high (col bit will get set to 0) // Only need to set the correct bits in PORTB and PORTD to drive the row high (col bit will get set to 0)


ddrbt = portBRowBitsCache | pgm_read_byte_near(portBColBits+int_x) ; // enable output for the Row pins to drive high, also enable output for col pins which are zero so will go low ddrbt = portBRowBitsCache | portBColBits[int_x] ; // enable output for the Row pins to drive high, also enable output for col pins which are zero so will go low


ddrdt = portDRowBitsCache | pgm_read_byte_near(portDColBits+int_x) ; ddrdt = portDRowBitsCache | portDColBits[int_x] ;


} else { // row goes low, cols go high.... } else { // row goes low, cols go high....


PORTB = pgm_read_byte_near(portBColBits+int_x); PORTB = portBColBits[int_x];
PORTD = pgm_read_byte_near(portDColBits+int_x); PORTD = portDColBits[int_x];


ddrbt = PORTB | portBRowBitsCache; // enable output for the col pins to drive high, also enable output for row pins which are zero so will go low ddrbt = PORTB | portBRowBitsCache; // enable output for the col pins to drive high, also enable output for row pins which are zero so will go low


Expand Down Expand Up @@ -402,7 +402,6 @@ static inline void refreshScreenClean(void)
} }





void init0 (void) __attribute__ ((naked)) __attribute__ ((section (".init0"))); void init0 (void) __attribute__ ((naked)) __attribute__ ((section (".init0")));


// This code will be run immedeately on reset, before any initilization or main() // This code will be run immedeately on reset, before any initilization or main()
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