Ramesh Yerraballi
ST7735 (Red Tab) working on the BBC Microbit
Fork of
ST7735_TFT
by 
Jonne Valola
Diff: ST7735_TFT.cpp
- Revision:
- 3:24f890609930
- Parent:
- 2:b460f048ecf5
diff -r b460f048ecf5 -r 24f890609930 ST7735_TFT.cpp
--- a/ST7735_TFT.cpp Wed Jan 24 02:12:24 2018 +0000
+++ b/ST7735_TFT.cpp Fri Jan 26 18:03:05 2018 +0000
@@ -170,14 +170,13 @@
return val;
}
-
void ST7735_TFT::tft_reset() {
static unsigned short driverCode;
// init SPI
_spi.format(8,3); // 8 bit spi mode 3
_spi.frequency(16000000); // 16Mhz SPI clock ... 15Mhz is maximum for display, but it seems to work
-
+ // RY: Changed to 4
// reset exactly like in Arduino version
_cs = 0;
_reset = 1; // reset
@@ -293,12 +292,12 @@
wr_dat(0x00);
wr_dat(0x02);
wr_dat(0x10);
-
- wr_cmd(ST7735_DISPON); // display ON
- wait_ms(100);
wr_cmd(ST7735_NORON); // normal display on
wait_ms(10);
+ wr_cmd(ST7735_DISPON); // display ON
+ wait_ms(100);
+/*
switch (orientation) {
case 0:
@@ -314,36 +313,34 @@
wr_reg(0xC8, 0x00A8);
break;
}
+*/
WindowMax ();
}
void ST7735_TFT::pixel(int x, int y, int color) {
+ // setup for data
+
if ((x >= width()) || (y >= height())) return;
-
- window(x,y,x+1,y+1);
-
- // setup for data
- _rs = 1;
- _cs = 0;
- _spi.format(16,3);
- _spi.write(color);
- _cs = 1;
- _spi.format(8,3);
+ window(x,y,x,y);
+ wr_dat_start();
+ wr_dat(color>>8);
+ wr_dat(color);
+ wr_dat_stop();
}
-void ST7735_TFT::window (unsigned int x, unsigned int y, unsigned int w, unsigned int h) {
+void ST7735_TFT::window (unsigned int x0, unsigned int y0, unsigned int x1, unsigned int y1) {
wr_cmd(ST7735_CASET); // column addr set
- wr_dat(0x00);
- wr_dat(x+2); // XSTART
- wr_dat(0x00);
- wr_dat(x+w+1); // XEND
+ wr_dat(0x00); //RY Changed this from the GreenTab to RedTab
+ wr_dat(x0); // XSTART
+ wr_dat(0x00); //RY Changed this from the GreenTab to RedTab
+ wr_dat(x1); // XEND
wr_cmd(ST7735_RASET); // row addr set
- wr_dat(0x00);
- wr_dat(y+1); // YSTART
- wr_dat(0x00);
- wr_dat(y+h+1); // YEND
+ wr_dat(0x00); //RY Changed this from the GreenTab to RedTab
+ wr_dat(y0); // YSTART
+ wr_dat(0x00); //RY Changed this from the GreenTab to RedTab
+ wr_dat(y1); // YEND
wr_cmd(ST7735_RAMWR); // write to RAM
}
@@ -353,20 +350,10 @@
window (0, 0, width(), height());
}
-
void ST7735_TFT::cls (void) {
- unsigned int i;
- WindowMax();
- wr_dat_start();
- _spi.format(16,3);
- for (i = 0; i < ( (width()+1) * (height()+3)); i++) {
- _spi.write(_background);
- }
- _spi.format(8,3);
- wr_dat_stop();
+ fillrect(0, 0, width(), height(), _background);
}
-
void ST7735_TFT::circle(int x0, int y0, int r, int color) {
int draw_x0, draw_y0;
@@ -480,40 +467,39 @@
circle(x,y,i,color);
}
-
+void ST7735_TFT::hline(int x, int y, int w, int color) {
+ int hi = color >> 8, lo = color;
-void ST7735_TFT::hline(int x0, int x1, int y, int color) {
- int w;
- w = x1 - x0 + 1;
- window(x0,y,w,1);
- wr_cmd(0x2C);
- wr_dat_start();
- for (int x=0; x<w; x++) {
- _spi.write(color);
- _spi.write(color >> 8);
- }
+ // Rudimentary clipping
+ if((x >= width()) || (y >= height())) return;
+ if((x+w-1) >= width()) w = width()-x;
+ window(x, y, x+w-1, y);
+
+ while (w--) {
+ wr_dat(hi);
+ wr_dat(lo);
+ }
wr_dat_stop();
return;
}
-
+void ST7735_TFT::vline(int x, int y, int h, int color) {
+ int hi = color >> 8, lo = color;
-void ST7735_TFT::vline(int x, int y0, int y1, int color) {
- int h;
- h = y1 - y0 + 1;
- window(x,y0,1,h);
- wr_cmd(0x2C);
- wr_dat_start();
- for (int y=0; y<h; y++) {
- _spi.write(color);
- _spi.write(color >> 8);
- }
- wr_dat_stop();
+ // Rudimentary clipping
+ if((x >= width()) || (y >= height())) return;
+ if((y+h-1) >= height()) h = height()-y;
+ window(x, y, x, y+h-1);
+
+ while (h--) {
+ wr_dat(hi);
+ wr_dat(lo);
+ }
+
+ wr_dat_stop();
return;
}
-
-
void ST7735_TFT::line(int x0, int y0, int x1, int y1, int color) {
WindowMax();
int dx = 0, dy = 0;
@@ -584,9 +570,6 @@
return;
}
-
-
-
void ST7735_TFT::rect(int x0, int y0, int x1, int y1, int color) {
if (x1 > x0) hline(x0,x1,y0,color);
@@ -604,211 +587,149 @@
return;
}
-
+void ST7735_TFT::fillrect(int x, int y, int w, int h, int color) {
+ int hi = color >> 8, lo = color;
-void ST7735_TFT::fillrect(int x0, int y0, int x1, int y1, int color) {
+ // rudimentary clipping (drawChar w/big text requires this)
+ if((x >= width()) || (y >= height())) return;
+ if((x + w - 1) >= width()) w = width() - x;
+ if((y + h - 1) >= height()) h = height() - y;
- int h = y1 - y0 + 1;
- int w = x1 - x0 + 1;
- int pixel = h * w;
- window(x0,y0,w,h);
- wr_cmd(0x2C);
- wr_dat_start();
- for (int p=0; p<pixel; p++) {
- _spi.write(color);
- _spi.write(color >> 8);
+ window(x, y, x+w-1, y+h-1);
+ for(y=h; y>0; y--) {
+ for(x=w; x>0; x--) {
+ wr_dat(hi);
+ wr_dat(lo);
}
- wr_dat_stop();
- return;
+ }
+ wr_dat_stop();
}
-
-
void ST7735_TFT::locate(int x, int y) {
char_x = x;
char_y = y;
}
-
-
int ST7735_TFT::columns() {
return width() / font[1];
}
-
-
int ST7735_TFT::rows() {
return height() / font[2];
}
-
-
-int ST7735_TFT::_putc(int value) {
- if (value == '\n') { // new line
- char_x = 0;
- char_y = char_y + font[2];
- if (char_y >= height() - font[2]) {
- char_y = 0;
- }
- } else {
- character(char_x, char_y, value);
- }
- return value;
-}
-
-
-
-
-void ST7735_TFT::character(int x, int y, int c) {
- unsigned int hor,vert,offset,bpl,j,i,b;
- unsigned char* zeichen;
- unsigned char z,w;
-
- if ((c < 31) || (c > 127)) return; // test char range
-
- // read font parameter from start of array
- offset = font[0]; // bytes / char
- hor = font[1]; // get hor size of font
- vert = font[2]; // get vert size of font
- bpl = font[3]; // bytes per line
-
- if (char_x + hor > width()) {
- char_x = 0;
- char_y = char_y + vert;
- if (char_y >= height() - font[2]) {
- char_y = 0;
- }
+int ST7735_TFT::_putc(int ch) {
+ if((ch == 10) || (ch == 13) || (ch == 27)){
+ char_y++; char_x=0;
+ if(char_y>15){
+ char_y = 0;
}
-
- window(char_x, char_y,hor,vert); // char box
- wr_cmd(0x2C);
- wr_dat_start();
- zeichen = &font[((c -32) * offset) + 4]; // start of char bitmap
- w = zeichen[0]; // width of actual char
- _spi.format(16,3); // pixel are 16 bit
-
- for (j=0; j<vert; j++) { // vert line
- for (i=0; i<hor; i++) { // horz line
- z = zeichen[bpl * i + ((j & 0xF8) >> 3)+1];
- b = 1 << (j & 0x07);
- if (( z & b ) == 0x00) {
- _spi.write(_background);
- } else {
- _spi.write(_foreground);
- }
- }
- }
- _spi.format(8,3); // 8 bit
- wr_dat_stop();
- if ((w + 2) < hor) { // x offset to next char
- char_x += w + 2;
- } else char_x += hor;
-}
-
-
-
-
-
-void ST7735_TFT::set_font(unsigned char* f) {
- font = f;
+ drawstring(0,char_y," ");
+ return 1;
+ }
+ character(char_x*6,char_y*10,ch, 1);
+ char_x++;
+ if(char_x>20){
+ char_x = 20;
+ character(char_x*6,char_y*10,'*', 1);
+ }
+ return 1;
}
+void ST7735_TFT::character(int x, int y, int c, int size) {
+ int line; // vertical column of pixels of character in font
+ int i, j;
+ if((x >= width()) || // Clip right
+ (y >= height()) || // Clip bottom
+ ((x + 6 * size - 1) < 0) || // Clip left
+ ((y + 8 * size - 1) < 0)) // Clip top
+ return;
-void ST7735_TFT::Bitmap(unsigned int x, unsigned int y, unsigned int w, unsigned int h,unsigned char *bitmap) {
- unsigned int i,j,value;
- unsigned short *bitmap_ptr = (unsigned short *)bitmap;
- window(x, y, w, h);
- wr_cmd(0x2C);
- wr_dat_start();
- for (j = 0; j < h; j++) { //Lines
- for (i = 0; i < w; i++) { // copy pixel data to TFT
- _spi.write(*bitmap_ptr); // one line
- _spi.write(*bitmap_ptr >> 8);
- bitmap_ptr++;
+ for (i=0; i<6; i++ ) {
+ if (i == 5)
+ line = 0x0;
+ else
+ line = Font[(c*5)+i];
+ for (j = 0; j<8; j++) {
+ if (line & 0x1) {
+ if (size == 1) // default size
+ pixel(x+i, y+j,_foreground);
+ else { // big size
+ fillrect(x+(i*size), y+(j*size), size, size, _foreground);
+ }
+ } else if (_background != _foreground) {
+ if (size == 1) // default size
+ pixel(x+i, y+j, _background);
+ else { // big size
+ fillrect(x+i*size, y+j*size, size, size, _background);
}
+ }
+ line >>= 1;
}
- wr_dat_stop();
+ }
+}
+
+void ST7735_TFT::drawstring(int x, int y, char *pt) {
+ int count = 0;
+ if(y>15) return;
+ while(*pt){
+ character(x*6, y*10, *pt, 1);
+ pt++;
+ x = x+1;
+ if(x>20) return; // number of characters printed
+ count++;
+ }
+ return; // number of characters printed
}
-
-int ST7735_TFT::BMP_16(unsigned int x, unsigned int y, const char *Name_BMP) {
-// BEWARE !
-// NOT TESTED
-#define OffsetPixelWidth 18
-#define OffsetPixelHeigh 22
-#define OffsetFileSize 34
-#define OffsetPixData 10
-#define OffsetBPP 28
-
- char filename[50];
- unsigned char BMP_Header[54];
- unsigned short BPP_t;
- unsigned int PixelWidth,PixelHeigh,start_data;
- unsigned int i,off;
- int padd,j;
- unsigned short *line;
-
- // get the filename
-// LocalFileSystem local("local");
- sprintf(&filename[0],"/local/");
- i=7;
- while (*Name_BMP!='\0') {
- filename[i++]=*Name_BMP++;
- }
- FILE *Image = fopen((const char *)&filename[0], "r"); // open the bmp file
- if (!Image) {
- return(0); // error file not found !
- }
-
- fread(&BMP_Header[0],1,54,Image); // get the BMP Header
-
- if (BMP_Header[0] != 0x42 || BMP_Header[1] != 0x4D) { // check magic byte
- fclose(Image);
- return(-1); // error no BMP file
- }
+void ST7735_TFT::Bitmap( short x, short y, short w, short h, const unsigned short *image) {
+ short skipC = 0; // non-zero if columns need to be skipped due to clipping
+ short originalWidth = w; // save this value; even if not all columns fit on the screen, the image is still this width in ROM
+ int i = w*(h - 1);
- BPP_t = BMP_Header[OffsetBPP] + (BMP_Header[OffsetBPP + 1] << 8);
- if (BPP_t != 0x0010) {
- fclose(Image);
- return(-2); // error no 16 bit BMP
- }
-
- PixelHeigh = BMP_Header[OffsetPixelHeigh] + (BMP_Header[OffsetPixelHeigh + 1] << 8) + (BMP_Header[OffsetPixelHeigh + 2] << 16) + (BMP_Header[OffsetPixelHeigh + 3] << 24);
- PixelWidth = BMP_Header[OffsetPixelWidth] + (BMP_Header[OffsetPixelWidth + 1] << 8) + (BMP_Header[OffsetPixelWidth + 2] << 16) + (BMP_Header[OffsetPixelWidth + 3] << 24);
- if (PixelHeigh > height() + y || PixelWidth > width() + x) {
- fclose(Image);
- return(-3); // to big
- }
-
- start_data = BMP_Header[OffsetPixData] + (BMP_Header[OffsetPixData + 1] << 8) + (BMP_Header[OffsetPixData + 2] << 16) + (BMP_Header[OffsetPixData + 3] << 24);
-
- line = (unsigned short *) malloc (PixelWidth); // we need a buffer for a line
- if (line == NULL) {
- return(-4); // error no memory
- }
+ if((x >= width()) || ((y - h + 1) >= height()) || ((x + w) <= 0) || (y < 0)){
+ return; // image is totally off the screen, do nothing
+ }
+ if((w > width()) || (h > height())){ // image is too wide for the screen, do nothing
+ //***This isn't necessarily a fatal error, but it makes the
+ //following logic much more complicated, since you can have
+ //an image that exceeds multiple boundaries and needs to be
+ //clipped on more than one side.
+ return;
+ }
+ if((x + w - 1) >= width()){ // image exceeds right of screen
+ skipC = (x + w) - width(); // skip cut off columns
+ w = width() - x;
+ }
+ if((y - h + 1) < 0){ // image exceeds top of screen
+ i = i - (h - y - 1)*originalWidth; // skip the last cut off rows
+ h = y + 1;
+ }
+ if(x < 0){ // image exceeds left of screen
+ w = w + x;
+ skipC = -1*x; // skip cut off columns
+ i = i - x; // skip the first cut off columns
+ x = 0;
+ }
+ if(y >= height()){ // image exceeds bottom of screen
+ h = h - (y - height() + 1);
+ y = height() - 1;
+ }
- // the lines are padded to multiple of 4 bytes
- padd = -1;
- do {
- padd ++;
- } while ((PixelWidth * 2 + padd)%4 != 0);
+ window(x, y-h+1, x+w-1, y);
- window(x, y,PixelWidth,PixelHeigh);
- wr_cmd(0x2C);
- wr_dat_start();
- _spi.format(16,3);
- for (j = PixelHeigh - 1; j >= 0; j--) { //Lines bottom up
- off = j * (PixelWidth * 2 + padd) + start_data; // start of line
- fseek(Image, off ,SEEK_SET);
- fread(line,1,PixelWidth * 2,Image); // read a line - slow !
- for (i = 0; i < PixelWidth; i++) { // copy pixel data to TFT
- _spi.write(line[i]); // one 16 bit pixel
- }
+ for(y=0; y<h; y=y+1){
+ for(x=0; x<w; x=x+1){
+ // send the top 8 bits
+ wr_dat((unsigned char)(image[i] >> 8));
+ // send the bottom 8 bits
+ wr_dat((unsigned char)(image[i]));
+ i = i + 1; // go to the next pixel
}
- _spi.format(8,3);
- wr_dat_stop();
- free (line);
- fclose(Image);
- return(1);
-}
\ No newline at end of file
+ i = i + skipC;
+ i = i - 2*originalWidth;
+ }
+
+ wr_dat_stop();
+}