forked from mwingerson/PICxel
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PICxel.cpp
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/
PICxel.cpp
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/************************************************************************/
/* PICxel.cpp - PIC32 Neopixel Library */
/* */
/* A simple to use library for addressable LEDs like the WS2812 for */
/* the PIC32 line of microcontrollers. */
/* */
/* tested supported boards: */
/* - Digilent UNO32 */
/* - Digilent UC32 */
/* */
/* This library is protected under the GNU GPL v3.0 license */
/* http://www.gnu.org/licenses/ */
/************************************************************************/
#include "PICxel.h"
/************************************************************************/
/* Construction for the PICxel class */
/************************************************************************/
PICxel::PICxel(uint16_t num, uint8_t pin, color_mode_t colorMode) : numberOfLEDs(num),
pin(pin), colorArray(NULL), portSet(portOutputRegister(digitalPinToPort(pin)) + 2),
portClr(portOutputRegister(digitalPinToPort(pin)) + 1),
pinMask(digitalPinToBitMask(pin)), brightness(255), colorMode(colorMode){
if(colorMode == GRB){
numberOfBytes = 3*num;
colorArray = (uint8_t*)calloc(numberOfBytes, sizeof(uint8_t));
}
else{
numberOfBytes = 4*num;
colorArray = (uint8_t*)calloc(numberOfBytes, sizeof(uint8_t));
}
}
/************************************************************************/
/* Destructor for the PICxel class */
/************************************************************************/
PICxel::~PICxel(){
if(colorArray)
free(colorArray);
}
/************************************************************************/
/* Sets the pinMode for selected pin */
/************************************************************************/
void PICxel::begin(){
//let MPIDE handle the tri-state buffer and
//assign analog inputs as needed
pinMode(pin, OUTPUT);
//clear the pin
*portClr = pinMask;
}
/************************************************************************/
/* Clears the color array in either GRB or HSV mode */
/************************************************************************/
void PICxel::clear(){
uint8_t* arrayPtr = colorArray;
if(colorMode == GRB)
for(int i=0; i < numberOfLEDs*3; i++)
arrayPtr[i] = 0;
else
for(int i = 0; i < numberOfLEDs*4; i++)
arrayPtr[i] = 0;
}
/************************************************************************/
/* Clears the LED in the colorArray */
/************************************************************************/
void PICxel::clear(uint8_t num){
if(colorMode == GRB){
colorArray[(num*3)+0] = 0;
colorArray[(num*3)+1] = 0;
colorArray[(num*3)+2] = 0;
}
else{
colorArray[(num*4)+0] = 0;
colorArray[(num*4)+1] = 0;
colorArray[(num*4)+2] = 0;
colorArray[(num*4)+3] = 0;
}
}
/************************************************************************/
/* sets the class brightness */
/************************************************************************/
void PICxel::setBrightness(uint8_t b){
brightness = b;
}
/************************************************************************/
/* Modifies the color matrix with the colors presented in 8-bit values */
/* for green, red and blue. The values are then scaled by the */
/* brightness value and placed into the location of number */
/************************************************************************/
void PICxel::GRBsetLEDColor(uint16_t number, uint8_t green, uint8_t red, uint8_t blue){
if(number < numberOfLEDs){
red = ((red*brightness) >> 8);
green = ((green*brightness) >> 8);
blue = ((blue*brightness) >> 8);
uint8_t *arrayPtr = &colorArray[number*3];
arrayPtr[0] = green;
arrayPtr[1] = red;
arrayPtr[2] = blue;
}
}
/************************************************************************/
/* Modifies the color matrix with the colors presented one 32-bit */
/* value. color is a 32-bit unsigned int that is organized into four */
/* bytes: */
/* bits[31 - 24][23 - 16][15 - 8][7 - 0] */
/* ( blank )( red )(green )(blue ) */
/* */
/* Each color is scaled by the brightness value and stored in the */
/* color array. */
/************************************************************************/
void PICxel::GRBsetLEDColor(uint16_t number, uint32_t color){
if(number < numberOfLEDs){
uint32_t red = (uint8_t)(color >> 8);
uint32_t green = (uint8_t)(color >> 16);
uint32_t blue = (uint8_t)(color);
red = (red * brightness) >> 8;
green = (green * brightness) >> 8;
blue = (blue * brightness) >> 8;
uint8_t *arrayPtr = &colorArray[number*3];
arrayPtr[0] = green;
arrayPtr[1] = red;
arrayPtr[2] = blue;
}
}
/************************************************************************/
/* Modifies the color matrix with the passed values hue, sat and val. */
/* */
/* Hue is a 16-bit value that ranges from 0-1535 representing the */
/* color wheel. 255 values per 60 degrees of the color wheel. sat */
/* val are 8-bit values that control saturation and value. If */
/* saturation is 0 then the LED will be off. */
/************************************************************************/
void PICxel::HSVsetLEDColor(uint16_t number, uint16_t hue, uint8_t sat, uint8_t val){
if(number < numberOfLEDs){
uint8_t *arrayPtr = &colorArray[number*4];
arrayPtr[0] = hue;
arrayPtr[1] = hue >> 8;
arrayPtr[2] = sat;
arrayPtr[3] = val;
}
}
/************************************************************************/
/* Modifies the color matrix with the colors presented one 32-bit */
/* value. color is a 32-bit unsigned int that is organized into four */
/* bytes: */
/* bits[ 31 - 24 ][ 23 - 16 ][15 - 8][7 - 0] */
/* (upper hue)(lower hue)( sat )( val ) */
/* */
/* Hue is a 16-bit value that ranges from 0-1535 representing the */
/* color wheel. 255 values per 60 degrees of the color wheel. sat */
/* val are 8-bit values that control saturation and value. If */
/* saturation is 0 then the LED will be off. */
/************************************************************************/
void PICxel::HSVsetLEDColor(uint16_t number, uint32_t color){
if(number < numberOfLEDs){
uint8_t *arrayPtr = &colorArray[number*4];
arrayPtr[0] = color;
arrayPtr[1] = color >> 8;
arrayPtr[2] = color >> 16;
arrayPtr[3] = color >> 24;
}
}
/************************************************************************/
/* Refreshed the LED strip with either GRBrefreshLEDs() or */
/* HSVrefreshLEDs() dependent on which color mode to use */
/************************************************************************/
void PICxel::refreshLEDs(void){
if(colorMode == GRB)
GRBrefreshLEDs();
else
HSVrefreshLEDs();
}
/************************************************************************/
/* Generate the datastream to refresh the LEDs using the RGB color */
/* mode. This function utilizes MIPS assembly no-op commands to */
/* ensure that the specific timing is met. */
/* */
/* In each frame of the bitstream there are three components that */
/* allow for easier manipulation: */
/* - high sector - the first 350ns of the bitframe that is high */
/* regardless of the data bit being a 1 or 0 */
/* - variable sector - the second 350ns of the bitframe that is high */
/* if a 1 and low if a zero */
/* - low sector - third and final 550ns of the bitframe that is low */
/* regardless of the data bit being a 1 or 0 */
/* */
/* There are preprocessor defined macros to control the variable */
/* number of no-ops required to meeting timing as easily as possible. */
/* preprocessor defined macros will allow for easier porting to other */
/* ChipKIT boards. */
/************************************************************************/
void PICxel::GRBrefreshLEDs(void){
//do not allow bitstream to be interrupted
noInterrupts();
uint8_t* colorArrayPtr = colorArray;
for(int j = 0; j < numberOfBytes; j++){
////////////////////
//Bit 0
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b10000000)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
*portClr = pinMask;
//wait forever
GRB_delay_three();
////////////////////
//Bit 1
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b01000000)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
*portClr = pinMask;
//wait forever
GRB_delay_three();
////////////////////
//Bit 2
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b00100000)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
*portClr = pinMask;
//wait forever
GRB_delay_three();
////////////////////
//Bit 3
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b00010000)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
//*port = lowBitMask;
*portClr = pinMask;
//wait forever
GRB_delay_three();
////////////////////
//Bit 4
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b00001000)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
*portClr = pinMask;
//wait forever
GRB_delay_three();
////////////////////
//Bit 5
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b00000100)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
*portClr = pinMask;
//wait forever
GRB_delay_three();
////////////////////
//Bit 6
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b00000010)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
*portClr = pinMask;
//wait forever
GRB_delay_three();
////////////////////
//Bit 7
////////////////////
//set port to high to start
*portSet = pinMask;
//wait forever
GRB_delay_one();
//set variable bitmask
if(*colorArrayPtr & 0b00000001)
*portSet = pinMask;
else
*portClr = pinMask;
//wait forever
GRB_delay_two();
//set port to low
*portClr = pinMask;
//wait forever
GRB_delay_three();
colorArrayPtr += 1;
}
*portClr = pinMask;
//bitstream done, enable interrupts
interrupts();
}
/************************************************************************/
/* Generate the data stream to refresh the LEDs using the HSV color */
/* mode. This function utilizes MIPS assembly to perform the */
/* HSV to GRB conversion for the next LED while sending data for the */
/* current LED. */
/* */
/* The overall structure is simple but is difficult to read with the */
/* HSV to GRB conversion inline. In each frame of the bitstream there */
/* are three components that allow for easier manipulation: */
/* - high sector - the first 350ns of the bitframe that is high */
/* regardless of the data bit being a 1 or 0 */
/* - variable sector - the second 350ns of the bitframe that is high */
/* if a 1 and low if a zero */
/* - low sector - third and final 550ns of the bitframe that is low */
/* regardless of the data bit being a 1 or 0 */
/* */
/* There are preprocessor defined macros to control the variable */
/* number of no-ops required to meeting timing as easily as possible. */
/* preprocessor defined macros will allow for easier porting to other */
/* ChipKIT boards. */
/************************************************************************/
void PICxel::HSVrefreshLEDs(void){
//do not allow bitstream to be interrupted
noInterrupts();
asm volatile(
"lw $s0, %4 \n\t" //load address if color_ptr
//compute first color
"j computeFirstColor \n\t"
"colorComputed: \n\t"
//loop through all LEDs
"forLoop: \n\t"
"move $t0, $t1 \n\t" //move the next_color to current_color
"move $t1, $zero \n\t" //clear next_color
"addi $s0, $s0, 4 \n\t"
"lw $t2, ($s0) \n\t"
"move $t6, $zero \n\t" //clear t6 for a byte iterator
"color_loop: \n\t"
////////////////////
//Bit 0
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
"andi $t3, $t2, 0xFFFF \n\t" //get hue
"srl $t4, $t2, 16 \n\t" //get saturation
"andi $t4, $t4, 0xFF \n\t"
"addi $t4, $t4, 1 \n\t"
"srl $t5, $t2, 24 \n\t" //get value
"andi $t5, $t5, 0xFF \n\t"
"addi $t5, $t5, 1 \n\t"
"multu $t5, $t4 \n\t" //chroma = sat * val
"mflo $t4 \n\t"
"srl $t4, $t4, 8 \n\t"
"subu $t5, $t5, $t4 \n\t" //m_num = value - chroma
//delay for the end of the first section
HSV_bit_0_delay_0 //preprocessor macro
"andi $t7, $t0, 0b10000000 \n\t" //bitmask out the value
"bne $t7, $zero, bit0IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit0IsHigh: \n\t"
//delay for the end of the second section
HSV_bit_0_delay_1 //preprocessor macro
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
//if(hue < 256)
"li $t7, 256 \n\t" //load hue
"sub $t7, $t3, $t7 \n\t" //store hue - 256
"bgez $t7, didNotMakeHue0 \n\t" //if hue>256 branch
//hue < 256
"multu $t3, $t4 \n\t" //set green
"mflo $t1 \n\t"
"srl $t1, $t1, 8 \n\t"
"add $t1, $t1, $t5 \n\t"
"addu $t7, $t4, $t5 \n\t" //set red
"addi $t7, $t7, -1 \n\t"
"sll $t7, $t7, 8 \n\t"
"andi $t7, $t7, 0xFF00 \n\t"
"or $t1, $t1, $t7 \n\t"
"andi $t7, $t5, 0xFF \n\t"
"sll $t7, $t5, 16 \n\t" //set blue
"or $t1, $t7, $t1 \n\t"
//delay for the end of the third section when the hue has been made
HSV_bit_0_delay_2 //preprocessor macro
"j madeHue0 \n\t"
"didNotMakeHue0: \n\t"
//delay for the end of the third section when the hue has not been made
HSV_bit_0_delay_3 //preprocessor macro
"madeHue0: \n\t"
////////////////////
//Bit 1
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
//delay for the end of the first section
HSV_universal_delay_1 //preprocessor macro
"andi $t7, $t0, 0b01000000 \n\t" //bitmask out the value
"bne $t7, $zero, bit1IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit1IsHigh: \n\t"
//delay for the end of the second section
HSV_universal_delay_2 //preprocessor macro
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
//if(next_color == 0) then continue
"bne $t1, $zero, huePrevMade1 \n\t"
//if(hue < 512)
"li $t7, 512 \n\t"
"sub $t7, $t3, $t7 \n\t"
"bgez $t7, didNotMakeHue1 \n\t"
//hue < 512
"addu $t7, $t4, $t5 \n\t" //set green
"addi $t7, $t7, -1 \n\t"
"andi $t1, $t7, 0xFF \n\t"
"li $t7, 511 \n\t" //set red
"subu $t7, $t7, $t3 \n\t"
"multu $t4, $t7 \n\t"
"mflo $t7 \n\t"
"srl $t7, $t7, 8 \n\t"
"addu $t7, $t7, $t5 \n\t"
"and $t7, $t7, 0xFF \n\t"
"sll $t7, $t7, 8 \n\t"
"or $t1, $t7, $t1 \n\t"
"sll $t7, $t5, 16 \n\t" //set blue
"or $t1, $t7, $t1 \n\t"
//delay for the end of the third section when hue is made
HSV_bit_1_delay_0
"j madeHue1 \n\t"
"huePrevMade1: \n\t"
//delay for the end of the third section hue was made earlier
HSV_bit_1_delay_1
"j madeHue1 \n\t"
"didNotMakeHue1: \n\t"
//delay for the end of the third section hue has not been made
HSV_bit_1_delay_2
"madeHue1: \n\t"
////////////////////
//Bit 2
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
//delay for the end of the first section
HSV_universal_delay_1 //preprocessor macro
"andi $t7, $t0, 0b00100000 \n\t" //bitmask out the value
"bne $t7, $zero, bit2IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit2IsHigh: \n\t"
//delay for the end of the second section
HSV_universal_delay_2 //preprocessor macro
"nop\n"
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
//if(next_color == 0) then continue
"bne $t1, $zero, huePrevMade2 \n\t"
//if(hue < 768)
"li $t7, 768 \n\t"
"sub $t7, $t3, $t7 \n\t"
"bgez $t7, didNotMakeHue2 \n\t"
//hue < 768
"addu $t7, $t4, $t5 \n\t" //set green
"addi $t7, $t7, -1 \n\t"
"andi $t1, $t7, 0xFF \n\t"
"sll $t7, $t5, 8 \n\t" //set red
"or $t1, $t7, $t1 \n\t"
"li $t7, 512 \n\t" //set blue
"subu $t7, $t3, $t7 \n\t"
"multu $t4, $t7 \n\t"
"mflo $t7 \n\t"
"srl $t7, $t7, 8 \n\t"
"addu $t7, $t7, $t5 \n\t"
"andi $t7, $t7, 0xFF \n\t"
"sll $t7, $t7, 16 \n\t"
"or $t1, $t7, $t1 \n\t"
//delay for the end of the third section when hue is made
HSV_bit_2_delay_0 //preprocessor macro
"j madeHue2 \n\t"
"huePrevMade2: \n\t"
//delay for the end of the third section hue was made earlier
HSV_bit_2_delay_1 //preprocessor macro
"j madeHue2 \n\t"
"didNotMakeHue2: \n\t"
//delay for the end of the third section when hue is not made
HSV_bit_2_delay_2 //preprocessor macro
"madeHue2: \n\t"
////////////////////
//Bit 3
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
//delay for the end of the first section
HSV_universal_delay_1 //preprocessor macro
"andi $t7, $t0, 0b00010000 \n\t" //
"bne $t7, $zero, bit3IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit3IsHigh: \n\t"
//delay for the end of the second section
HSV_universal_delay_2 //preprocessor macro
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
//if(next_color == 0) then continue
"bne $t1, $zero, huePrevMade3 \n\t"
//if(hue < 1024)
"li $t7, 1024 \n\t"
"sub $t7, $t3, $t7 \n\t"
"bgez $t7, didNotMakeHue3 \n\t"
//hue < 1024
"li $t7, 1023 \n\t" //set green
"subu $t7, $t7, $t3 \n\t"
"multu $t4, $t7 \n\t"
"mflo $t7 \n\t"
"srl $t7, $t7, 8 \n\t"
"addu $t1, $t7, $t5 \n\t"
//"and $t7, $t7, 0xFF \n\t"
"sll $t7, $t5, 8 \n\t" //set red
"or $t1, $t7, $t1 \n\t"
"addu $t7, $t4, $t5 \n\t" //set blue
"addi $t7, $t7, -1 \n\t"
"andi $t7, $t7, 0xFF \n\t"
"sll $t7, $t7, 16 \n\t"
"or $t1, $t7, $t1 \n\t"
//delay for the end of the third section when hue is made
HSV_bit_3_delay_0
"j madeHue3 \n\t"
"huePrevMade3: \n\t"
//delay for the end of the third section hue was made earlier
HSV_bit_3_delay_1
"j madeHue3 \n\t"
"didNotMakeHue3: \n\t"
//delay for the end of the third section when hue is not made
HSV_bit_3_delay_2
"madeHue3: \n\t"
////////////////////
//Bit 4
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
//delay for the end of the first section
HSV_universal_delay_1 //preprocessor macro
"andi $t7, $t0, 0b00001000 \n\t" //
"bne $t7, $zero, bit4IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit4IsHigh: \n\t"
//delay for the end of the second section
HSV_universal_delay_2 //preprocessor macro
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
//if next_color is not zero then branch
"bne $t1, $zero, huePrevMade4 \n\t"
//if(hue < 1280)
"li $t7, 1280 \n\t"
"sub $t7, $t3, $t7 \n\t"
"bgez $t7, didNotMakeHue4 \n\t"
//hue < 1280
"andi $t1, $t5, 0xFF \n\t" //set green
"li $t7, 1024 \n\t" //set red
"subu $t7, $t3, $t7 \n\t"
"multu $t7, $t4 \n\t"
"mflo $t7 \n\t"
"srl $t7, $t7, 8 \n\t"
"addu $t7, $t7, $t5 \n\t"
"sll $t7, $t7, 8 \n\t"
"or $t1, $t1, $t7 \n\t"
"addu $t7, $t4, $t5 \n\t" //set blue
"addi $t7, $t7, -1 \n\t"
"sll $t7, $t7, 16 \n\t"
"or $t1, $t7, $t1 \n\t"
//delay for the end of the third section when hue is made
HSV_bit_4_delay_0 //preprocessor macro
"j madeHue4 \n\t"
"huePrevMade4: \n\t"
//delay for the end of the third section hue was made earlier
HSV_bit_4_delay_1 //preprocessor macro
"j madeHue4 \n\t"
"didNotMakeHue4: \n\t"
//delay for the end of the third section when hue is not made
HSV_bit_4_delay_2
"madeHue4: \n\t"
////////////////////
//Bit 5
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
//delay for the end of the first section
HSV_universal_delay_1 //preprocessor macro
"andi $t7, $t0, 0b0000100 \n\t" //
"bne $t7, $zero, bit5IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit5IsHigh: \n\t"
//delay for the end of the second section
HSV_universal_delay_2 //preprocessor macro
"nop \n"
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
//if next_color is not zero then branch
"bne $t1, $zero, huePrevMade5 \n\t"
//if(hue < 1536)
"li $t7, 1536 \n\t"
"sub $t7, $t3, $t7 \n\t"
"bgez $t7, didNotMakeHue5 \n\t"
//hue < 1536
"andi $t1, $t5, 0xFF \n\t" //set green
"addu $t7, $t4, $t5 \n\t" //set red
"addi $t7, $t7, -1 \n\t"
"sll $t7, $t7, 8 \n\t"
"or $t1, $t1, $t7 \n\t"
"li $t7, 1535 \n\t" //set blue
"subu $t7, $t7, $t3 \n\t"
"multu $t7, $t4 \n\t"
"mflo $t7 \n\t"
"andi $t7, $t7, 0xFF00 \n\t"
"sll $t7, $t7, 8 \n\t"
"or $t1, $t1, $t7 \n\t"
//delay for the end of the third section when hue is made
HSV_bit_5_delay_0 //preprocessor macro
"j madeHue5 \n\t"
"huePrevMade5: \n\t"
//delay for the end of the third section hue was made earlier
HSV_bit_5_delay_1 //preprocessor macro
"j madeHue5 \n\t"
"didNotMakeHue5: \n\t"
//delay for the end of the third section when hue is not made
HSV_bit_5_delay_2 //preprocessor macro
"madeHue5: \n\t"
////////////////////
//Bit 6
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
//delay for the end of the first section
HSV_universal_delay_1 //preprocessor macro
"andi $t7, $t0, 0b00000010 \n\t" //
"bne $t7, $zero, bit6IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit6IsHigh: \n\t"
//delay for the end of the second section
HSV_universal_delay_2 //preprocessor macro
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"srl $t7, $t2, 24 \n\t" //get value
"andi $t7, $t7, 0xFF \n\t"
"bne $t7, $zero, zero_val_check_1 \n\t"
"move $t1, $zero \n\t"
"zero_val_check_1: \n\t"
//delay for the end of the second section
HSV_universal_delay_3 //preprocessor macro
////////////////////
//Bit 7
////////////////////
"lw $t7, %3 \n\t" //set pin
"sw %0, ($t7) \n\t"
//delay for the end of the first section
HSV_universal_delay_1 //preprocessor macro
"andi $t7, $t0, 0b00000001 \n\t" //
"bne $t7, $zero, bit7IsHigh \n\t" //branch if bit is high, branch over set low
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
"bit7IsHigh: \n\t"
//delay for the end of the second section
HSV_universal_delay_2 //preprocessor macro
"lw $t7, %2 \n\t" //clear pin
"sw %0, ($t7) \n\t"
//delay for the end of the second section
HSV_universal_delay_3 //preprocessor macro
//shift the data to the next color byte
"srl $t0, $t0, 8 \n\t"
"addi $t6, $t6, 1 \n\t" //iterate t6
"li $t7, 3 \n\t" //load
"bne $t7, $t6, color_loop \n\t"
///////////////////////////////
//end of data stream
"addi %1, %1, -1 \n\t" //decrement the led
"bgt %1, $zero, forLoop \n\t"
//end of forLoop:
"j HSVassemblyEnd \n\t"
"computeFirstColor: \n\t"
//color computation
"lw $t2, ($s0) \n\t" //dereference color_ptr address
"move $t1, $zero \n\t" //clear next color
"andi $t3, $t2, 0xFFFF \n\t" //get hue
"srl $t4, $t2, 16 \n\t" //get saturation
"andi $t4, $t4, 0xFF \n\t"
"addi $t4, $t4, 1 \n\t"
"srl $t5, $t2, 24 \n\t" //get value
"andi $t5, $t5, 0xFF \n\t"
"addi $t5, $t5, 1 \n\t"
"multu $t5, $t4 \n\t" //chroma = sat * val
"mflo $t4 \n\t"
"srl $t4, $t4, 8 \n\t"
"subu $t5, $t5, $t4 \n\t" //m_num = value - chroma
//if(hue < 256)
"li $t7, 256 \n\t" //load hue
"sub $t7, $t3, $t7 \n\t" //store hue - 256
"bgez $t7, comp_hue1 \n\t" //if hue>256 branch
//hue < 256
"multu $t3, $t4 \n\t" //set green
"mflo $t7 \n\t"
"srl $t7, $t7, 8 \n\t"
"add $t1, $t7, $t5 \n\t"
"addu $t7, $t4, $t5 \n\t" //set red
"addi $t7, $t7, -1 \n\t"
"sll $t7, $t7, 8 \n\t"
"andi $t7, $t7, 0xFF00 \n\t"
"or $t1, $t1, $t7 \n\t"
"andi $t7, $t5, 0xFF \n\t"
"sll $t7, $t5, 16 \n\t" //set blue
"or $t1, $t7, $t1 \n\t"
"j comp_hue_end \n\t" //jump to end
"comp_hue1: \n\t"
//if(hue < 512)
"li $t7, 512 \n\t"
"sub $t7, $t3, $t7 \n\t"
"bgez $t7, comp_hue2 \n\t"
//hue < 512
"addu $t7, $t4, $t5 \n\t" //set green
"addi $t7, $t7, -1 \n\t"