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LCDC.cpp
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LCDC.cpp
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// LCD Controller
// (c) 2005 Jerome Cornet
// 2007 Matthieu Moy
#include "LCDC.h"
#include "LCDC_registermap.h"
#include "ensitlm.h"
using namespace std;
using namespace sc_core;
// constants
const int LCDC::kWidth = 320;
const int LCDC::kHeight = 240;
// Constructor
LCDC::LCDC(sc_module_name name, const sc_time &display_period)
: sc_module(name), period(display_period) {
static XSizeHints size_hints;
Window rootwin;
int width, height, depth;
XGCValues values;
unsigned long valuemask = 0;
Visual *visual;
// registers initialisation
addr_register = 0;
int_register = 0;
start_register = 0;
started = false;
sensitive << display_int;
// X11 Initialisation
width = kWidth;
height = kHeight;
display = XOpenDisplay(NULL);
if (display == NULL) {
cerr << "Failed to open Display!" << endl;
sc_stop();
}
screen = DefaultScreen(display);
depth = DefaultDepth(display, screen);
visual = DefaultVisual(display, screen);
cmap = DefaultColormap(display, screen);
rootwin = RootWindow(display, screen);
window = XCreateSimpleWindow(display, rootwin, 10, 10, width, height, 5,
BlackPixel(display, screen),
BlackPixel(display, screen));
size_hints.flags = PSize | PMinSize | PMaxSize;
size_hints.min_width = width;
size_hints.max_width = width;
size_hints.min_height = height;
size_hints.max_height = height;
XSetWindowColormap(display, window, cmap);
init_colormap();
gc = XCreateGC(display, window, valuemask, &values);
XSetStandardProperties(display, window, name, name, None, 0, 0,
&size_hints);
XSelectInput(display, window, ButtonPressMask | KeyPressMask);
XMapWindow(display, window);
buffer = 0;
image = XCreateImage(display, visual, depth, ZPixmap, 0, buffer, width,
height, 8, 0);
{
// tricks to have it working in non 8-bit depth
int imgsize = image->height * image->bytes_per_line;
buffer = (char *)malloc(imgsize);
for (int i = 0; i < imgsize; i++)
buffer[i] = 0;
}
image->data = buffer;
XPutImage(display, window, gc, image, 0, 0, 0, 0, kWidth, kHeight);
// SystemC threads declarations
SC_THREAD(compute);
}
// Destructor
LCDC::~LCDC() {
// Deallocate internal Ximage
// also deallocate buffer
XDestroyImage(image);
// Close X connection
XCloseDisplay(display);
}
// Others initialisations
void LCDC::end_of_elaboration() {
display_int.write(false);
}
// Colormap init
// The colormap is an array giving the nearest X11 color value
// corresponding to the 8 bit grayscale value passed in index
void LCDC::init_colormap() {
XColor c;
for (int i = 0; i < 256; i++) {
c.red = i * 65535 / 255;
c.green = i * 65355 / 255;
c.blue = i * 65535 / 255;
c.flags = DoRed | DoGreen | DoBlue;
if (XAllocColor(display, cmap, &c)) {
color_table[i] = c.pixel;
} else {
// If not enough color available
if (cmap == DefaultColormap(display, screen)) {
cmap = XCopyColormapAndFree(display, cmap);
XSetWindowColormap(display, window, cmap);
c.red = i * 65535 / 255;
c.green = i * 65535 / 255;
c.blue = i * 65535 / 255;
c.flags = DoRed | DoGreen | DoBlue;
if (XAllocColor(display, cmap, &c)) {
color_table[i] = c.pixel;
}
}
}
}
}
// Read transactions
tlm::tlm_response_status LCDC::read(const ensitlm::addr_t &a,
ensitlm::data_t &d) {
switch (a) {
case LCDC_START_REG:
d = start_register;
break;
case LCDC_ADDR_REG:
d = addr_register;
break;
case LCDC_INT_REG:
d = int_register;
break;
default:
cerr << name() << ": Read access outside register range!"
<< endl;
return tlm::TLM_ADDRESS_ERROR_RESPONSE;
}
return tlm::TLM_OK_RESPONSE;
}
// Write transactions
tlm::tlm_response_status LCDC::write(const ensitlm::addr_t &a,
const ensitlm::data_t &d) {
switch (a) {
case LCDC_START_REG:
start_register = d;
if(start_register == 1){
started = true;
}
break;
case LCDC_ADDR_REG:
addr_register = d;
break;
case LCDC_INT_REG:
int_register = d;
if (int_register == 0)
display_int.write(false);
break;
default:
cerr << name() << ": Write access outside register range!"
<< endl;
return tlm::TLM_ADDRESS_ERROR_RESPONSE;
}
return tlm::TLM_OK_RESPONSE;
}
// main thread
void LCDC::compute() {
while (!started) {
wait(start_event);
}
cout << name() << ": LCDC starting" << endl;
while (true) {
wait(period);
fill_buffer();
draw();
if (int_register == 0) {
cout << name() << ": sending display interrupt" << endl;
int_register = 1;
display_int.write(true);
}
}
}
// Transfer the internal XImage buffer to the lcd window
void LCDC::draw() {
XPutImage(display, window, gc, image, 0, 0, 0, 0, kWidth, kHeight);
}
// Reads an external memory devices and fill the buffer corresponding to the
// internal XImage
void LCDC::fill_buffer() {
ensitlm::addr_t a = addr_register;
ensitlm::data_t d;
tlm::tlm_response_status status;
for (int y = 0; y < kHeight; y++) {
for (int x = 0; x < kWidth / 4; x++) {
status = initiator_socket.read(a, d);
if (status != tlm::TLM_OK_RESPONSE) {
cerr << name() << ": error while reading "
"memory (address: 0x" << hex
<< a << ")" << endl;
} else {
int sourcevalues[4];
// extract each pixel from the 32 bits value
// data is considered to be in big endian format
sourcevalues[0] = (d & 0xFF000000) >> 24;
sourcevalues[1] = (d & 0x00FF0000) >> 16;
sourcevalues[2] = (d & 0x0000FF00) >> 8;
sourcevalues[3] = (d & 0x000000FF);
// blit the pixels in the buffer
XPutPixel(image, x * 4, y,
color_table[sourcevalues[0]]);
XPutPixel(image, x * 4 + 1, y,
color_table[sourcevalues[1]]);
XPutPixel(image, x * 4 + 2, y,
color_table[sourcevalues[2]]);
XPutPixel(image, x * 4 + 3, y,
color_table[sourcevalues[3]]);
}
a += 4;
}
}
}