Peter Drescher
Library to control a QVGA TFT connected to SPI. You can use printf to print text The lib can handle different fonts, draw lines, circles, rect and bmp
Diff: SPI_TFT.cpp
- Revision:
- 4:e1e45f8a7664
- Child:
- 5:2db1b8070d94
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SPI_TFT.cpp Thu Jul 14 20:13:07 2011 +0000
@@ -0,0 +1,651 @@
+/* mbed library for 240*320 pixel display TFT based on HX8347D LCD Controller
+ * Copyright (c) 2011 Peter Drescher - DC2PD
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "SPI_TFT.h"
+#include "mbed.h"
+
+
+#define BPP 16 // Bits per pixel
+
+
+
+SPI_TFT::SPI_TFT(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName reset, const char *name)
+ : _spi(mosi, miso, sclk), _cs(cs), _reset(reset),GraphicsDisplay(name) {
+ tft_reset();
+ orientation = 0;
+ char_x = 0;
+}
+
+int SPI_TFT::width() {
+ if (orientation == 0 || orientation == 2) return 240;
+ else return 320;
+}
+
+
+int SPI_TFT::height() {
+ if (orientation == 0 || orientation == 2) return 320;
+ else return 240;
+}
+
+
+
+void SPI_TFT::set_orientation(unsigned int o) {
+ orientation = o;
+ switch (orientation) {
+ case 0:
+ wr_reg(0x16, 0x0008);
+ break;
+ case 1:
+ wr_reg(0x16, 0x0068);
+ break;
+ case 2:
+ wr_reg(0x16, 0x00C8);
+ break;
+ case 3:
+ wr_reg(0x16, 0x00A8);
+ break;
+ }
+}
+
+
+
+void SPI_TFT::wr_cmd(int cmd) {
+ _cs = 0;
+ _spi.write(SPI_START | SPI_WR | SPI_INDEX); /* Write : RS = 0, RW = 0 */
+ _spi.write(cmd);
+ _cs = 1;
+}
+
+
+
+void SPI_TFT::wr_dat(int dat) {
+ _cs = 0;
+ _spi.write(SPI_START | SPI_WR | SPI_DATA); // Write : RS = 1, RW = 0
+ _spi.format(16,3); // switch to 16 bit Mode 3
+ _spi.write(dat); // Write D0..D15
+ _spi.format(8,3); // 8 bit Mode 3
+ _cs = 1;
+}
+
+
+
+void SPI_TFT::wr_dat_start(void) {
+ _cs = 0;
+ _spi.write(SPI_START | SPI_WR | SPI_DATA); /* Write : RS = 1, RW = 0 */
+}
+
+
+
+void SPI_TFT::wr_dat_stop (void) {
+ _cs = 1;
+}
+
+
+
+void SPI_TFT::wr_dat_only (unsigned short dat) {
+
+ _spi.format(16,3); // switch to 16 bit Mode 3
+ _spi.write(dat); // Write D0..D15
+ _spi.format(8,3); // 8 bit Mode 3
+}
+
+
+
+unsigned short SPI_TFT::rd_dat (void) {
+ unsigned short val = 0;
+
+ _cs = 0;
+ _spi.write(SPI_START | SPI_RD | SPI_DATA); /* Read: RS = 1, RW = 1 */
+ _spi.write(0); /* Dummy read 1 */
+ val = _spi.write(0); /* Read D8..D15 */
+ val <<= 8;
+ val |= _spi.write(0); /* Read D0..D7 */
+ _cs = 1;
+ return (val);
+}
+
+
+
+void SPI_TFT::wr_reg (unsigned char reg, unsigned short val) {
+
+ wr_cmd(reg);
+ wr_dat(val);
+}
+
+
+
+unsigned short SPI_TFT::rd_reg (unsigned char reg) {
+
+ wr_cmd(reg);
+ return(rd_dat());
+}
+
+
+
+void SPI_TFT::tft_reset() {
+ static unsigned short driverCode;
+ _spi.format(8,3); // 8 bit spi mode 3
+ _spi.frequency(48000000); // 48Mhz SPI clock
+ _reset = 0; // reset
+ _cs = 1;
+ wait_us(50);
+ _reset = 1; // end reset
+ wait_ms(5);
+
+ driverCode = rd_reg(0x00); // read controller ID
+ //printf("Disp_ID = %x",driverCode);
+
+ /* Start Initial Sequence ----------------------------------------------------*/
+ wr_reg(0xEA, 0x0000); /* Reset Power Control 1 */
+ wr_reg(0xEB, 0x0020); /* Power Control 2 */
+ wr_reg(0xEC, 0x000C); /* Power Control 3 */
+ wr_reg(0xED, 0x00C4); /* Power Control 4 */
+ wr_reg(0xE8, 0x0040); /* Source OPON_N */
+ wr_reg(0xE9, 0x0038); /* Source OPON_I */
+ wr_reg(0xF1, 0x0001); /* */
+ wr_reg(0xF2, 0x0010); /* */
+ wr_reg(0x27, 0x00A3); /* Display Control 2 */
+
+ /* Power On sequence ---------------------------------------------------------*/
+ wr_reg(0x1B, 0x001B); /* Power Control 2 */
+ wr_reg(0x1A, 0x0001); /* Power Control 1 */
+ wr_reg(0x24, 0x002F); /* Vcom Control 2 */
+ wr_reg(0x25, 0x0057); /* Vcom Control 3 */
+ wr_reg(0x23, 0x008D); /* Vcom Control 1 */
+
+ /* Gamma settings -----------------------------------------------------------*/
+ wr_reg(0x40,0x00); //
+ wr_reg(0x41,0x00); //
+ wr_reg(0x42,0x01); //
+ wr_reg(0x43,0x13); //
+ wr_reg(0x44,0x10); //
+ wr_reg(0x45,0x26); //
+ wr_reg(0x46,0x08); //
+ wr_reg(0x47,0x51); //
+ wr_reg(0x48,0x02); //
+ wr_reg(0x49,0x12); //
+ wr_reg(0x4A,0x18); //
+ wr_reg(0x4B,0x19); //
+ wr_reg(0x4C,0x14); //
+ wr_reg(0x50,0x19); //
+ wr_reg(0x51,0x2F); //
+ wr_reg(0x52,0x2C); //
+ wr_reg(0x53,0x3E); //
+ wr_reg(0x54,0x3F); //
+ wr_reg(0x55,0x3F); //
+ wr_reg(0x56,0x2E); //
+ wr_reg(0x57,0x77); //
+ wr_reg(0x58,0x0B); //
+ wr_reg(0x59,0x06); //
+ wr_reg(0x5A,0x07); //
+ wr_reg(0x5B,0x0D); //
+ wr_reg(0x5C,0x1D); //
+ wr_reg(0x5D,0xCC); //
+
+ /* Power + Osc ---------------------------------------------------------------*/
+ wr_reg(0x18, 0x0036); /* OSC Control 1 */
+ wr_reg(0x19, 0x0001); /* OSC Control 2 */
+ wr_reg(0x01, 0x0000); /* Display Mode Control */
+ wr_reg(0x1F, 0x0088); /* Power Control 6 */
+ wait_ms(5); /* Delay 5 ms */
+ wr_reg(0x1F, 0x0080); /* Power Control 6 */
+ wait_ms(5); /* Delay 5 ms */
+ wr_reg(0x1F, 0x0090); /* Power Control 6 */
+ wait_ms(5); /* Delay 5 ms */
+ wr_reg(0x1F, 0x00D0); /* Power Control 6 */
+ wait_ms(5); /* Delay 5 ms */
+
+ wr_reg(0x17, 0x0005); /* Colmod 16Bit/Pixel */
+
+ wr_reg(0x36, 0x0000); /* Panel Characteristic */
+ wr_reg(0x28, 0x0038); /* Display Control 3 */
+ wait_ms(40);
+ wr_reg(0x28, 0x003C); /* Display Control 3 */
+ switch (orientation) {
+ case 0:
+ wr_reg(0x16, 0x0008);
+ break;
+ case 1:
+ wr_reg(0x16, 0x0068);
+ break;
+ case 2:
+ wr_reg(0x16, 0x00C8);
+ break;
+ case 3:
+ wr_reg(0x16, 0x00A8);
+ break;
+ }
+
+ WindowMax ();
+}
+
+
+
+
+void SPI_TFT::pixel(int x, int y, int color) {
+ wr_reg(0x03, (x >> 0));
+ wr_reg(0x02, (x >> 8));
+ wr_reg(0x07, (y >> 0));
+ wr_reg(0x06, (y >> 8));
+ wr_cmd(0x22);
+ wr_dat(color);
+}
+
+
+
+
+void SPI_TFT::window (unsigned int x, unsigned int y, unsigned int w, unsigned int h) {
+ wr_reg(0x03, (x >> 0));
+ wr_reg(0x02, (x >> 8));
+ wr_reg(0x05, (x+w-1 >> 0));
+ wr_reg(0x04, (x+w-1 >> 8));
+ wr_reg(0x07, ( y >> 0));
+ wr_reg(0x06, ( y >> 8));
+ wr_reg(0x09, ( y+h-1 >> 0));
+ wr_reg(0x08, ( y+h-1 >> 8));
+ //wr_cmd(0x22);
+}
+
+
+void SPI_TFT::WindowMax (void) {
+ window (0, 0, width(), height());
+}
+
+
+void SPI_TFT::cls (void) {
+ unsigned int i;
+ WindowMax();
+ wr_cmd(0x22);
+ wr_dat_start();
+ _spi.format(16,3); // 16 bit Mode 3
+ for (i = 0; i < ( width() * height()); i++)
+ _spi.write(_background);
+ _spi.format(8,3); // 8 bit Mode 3
+ wr_dat_stop();
+}
+
+
+void SPI_TFT::circle(int x0, int y0, int r, int color) {
+
+ int draw_x0, draw_y0;
+ int draw_x1, draw_y1;
+ int draw_x2, draw_y2;
+ int draw_x3, draw_y3;
+ int draw_x4, draw_y4;
+ int draw_x5, draw_y5;
+ int draw_x6, draw_y6;
+ int draw_x7, draw_y7;
+ int xx, yy;
+ int di;
+ WindowMax();
+ if (r == 0) { /* no radius */
+ return;
+ }
+
+ draw_x0 = draw_x1 = x0;
+ draw_y0 = draw_y1 = y0 + r;
+ if (draw_y0 < height()) {
+ pixel(draw_x0, draw_y0, color); /* 90 degree */
+ }
+
+ draw_x2 = draw_x3 = x0;
+ draw_y2 = draw_y3 = y0 - r;
+ if (draw_y2 >= 0) {
+ pixel(draw_x2, draw_y2, color); /* 270 degree */
+ }
+
+ draw_x4 = draw_x6 = x0 + r;
+ draw_y4 = draw_y6 = y0;
+ if (draw_x4 < width()) {
+ pixel(draw_x4, draw_y4, color); /* 0 degree */
+ }
+
+ draw_x5 = draw_x7 = x0 - r;
+ draw_y5 = draw_y7 = y0;
+ if (draw_x5>=0) {
+ pixel(draw_x5, draw_y5, color); /* 180 degree */
+ }
+
+ if (r == 1) {
+ return;
+ }
+
+ di = 3 - 2*r;
+ xx = 0;
+ yy = r;
+ while (xx < yy) {
+
+ if (di < 0) {
+ di += 4*xx + 6;
+ } else {
+ di += 4*(xx - yy) + 10;
+ yy--;
+ draw_y0--;
+ draw_y1--;
+ draw_y2++;
+ draw_y3++;
+ draw_x4--;
+ draw_x5++;
+ draw_x6--;
+ draw_x7++;
+ }
+ xx++;
+ draw_x0++;
+ draw_x1--;
+ draw_x2++;
+ draw_x3--;
+ draw_y4++;
+ draw_y5++;
+ draw_y6--;
+ draw_y7--;
+
+ if ( (draw_x0 <= width()) && (draw_y0>=0) ) {
+ pixel(draw_x0, draw_y0, color);
+ }
+
+ if ( (draw_x1 >= 0) && (draw_y1 >= 0) ) {
+ pixel(draw_x1, draw_y1, color);
+ }
+
+ if ( (draw_x2 <= width()) && (draw_y2 <= height()) ) {
+ pixel(draw_x2, draw_y2, color);
+ }
+
+ if ( (draw_x3 >=0 ) && (draw_y3 <= height()) ) {
+ pixel(draw_x3, draw_y3, color);
+ }
+
+ if ( (draw_x4 <= width()) && (draw_y4 >= 0) ) {
+ pixel(draw_x4, draw_y4, color);
+ }
+
+ if ( (draw_x5 >= 0) && (draw_y5 >= 0) ) {
+ pixel(draw_x5, draw_y5, color);
+ }
+ if ( (draw_x6 <=width()) && (draw_y6 <= height()) ) {
+ pixel(draw_x6, draw_y6, color);
+ }
+ if ( (draw_x7 >= 0) && (draw_y7 <= height()) ) {
+ pixel(draw_x7, draw_y7, color);
+ }
+ }
+ return;
+}
+
+void SPI_TFT::fillcircle(int x, int y, int r, int color){
+ int i;
+ for (i = 0;i <= r; i++)
+ circle(x,y,i,color);
+}
+
+
+
+void SPI_TFT::hline(int x0, int x1, int y, int color) {
+ int w;
+ w = x1 - x0 + 1;
+ window(x0,y,w,1);
+ wr_cmd(0x22);
+ wr_dat_start();
+ _spi.format(16,3); // pixel are send in 16 bit mode to speed up
+ for (int x=0; x<w; x++) {
+ _spi.write(color);
+ }
+ _spi.format(8,3);
+ wr_dat_stop();
+ return;
+}
+
+
+
+void SPI_TFT::vline(int x, int y0, int y1, int color) {
+ int h;
+ h = y1 - y0 + 1;
+ window(x,y0,1,h);
+ wr_cmd(0x22);
+ wr_dat_start();
+ _spi.format(16,3); // pixel are send in 16 bit mode to speed up
+ for (int y=0; y<h; y++) {
+ _spi.write(color);
+ }
+ _spi.format(8,3);
+ wr_dat_stop();
+ return;
+}
+
+
+
+void SPI_TFT::line(int x0, int y0, int x1, int y1, int color) {
+ WindowMax();
+ int dx = 0, dy = 0;
+ int dx_sym = 0, dy_sym = 0;
+ int dx_x2 = 0, dy_x2 = 0;
+ int di = 0;
+
+ dx = x1-x0;
+ dy = y1-y0;
+
+ if (dx == 0) { /* vertical line */
+ if (y1 > y0) vline(x0,y0,y1,color);
+ else vline(x0,y1,y0,color);
+ return;
+ }
+
+ if (dx > 0) {
+ dx_sym = 1;
+ } else {
+ dx_sym = -1;
+ }
+ if (dy == 0) { /* horizontal line */
+ if (x1 > x0) hline(x0,x1,y0,color);
+ else hline(x1,x0,y0,color);
+ return;
+ }
+
+ if (dy > 0) {
+ dy_sym = 1;
+ } else {
+ dy_sym = -1;
+ }
+
+ dx = dx_sym*dx;
+ dy = dy_sym*dy;
+
+ dx_x2 = dx*2;
+ dy_x2 = dy*2;
+
+ if (dx >= dy) {
+ di = dy_x2 - dx;
+ while (x0 != x1) {
+
+ pixel(x0, y0, color);
+ x0 += dx_sym;
+ if (di<0) {
+ di += dy_x2;
+ } else {
+ di += dy_x2 - dx_x2;
+ y0 += dy_sym;
+ }
+ }
+ pixel(x0, y0, color);
+ } else {
+ di = dx_x2 - dy;
+ while (y0 != y1) {
+ pixel(x0, y0, color);
+ y0 += dy_sym;
+ if (di < 0) {
+ di += dx_x2;
+ } else {
+ di += dx_x2 - dy_x2;
+ x0 += dx_sym;
+ }
+ }
+ pixel(x0, y0, color);
+ }
+ return;
+}
+
+
+
+
+void SPI_TFT::rect(int x0, int y0, int x1, int y1, int color) {
+
+ if (x1 > x0) hline(x0,x1,y0,color);
+ else hline(x1,x0,y0,color);
+
+ if (y1 > y0) vline(x0,y0,y1,color);
+ else vline(x0,y1,y0,color);
+
+ if (x1 > x0) hline(x0,x1,y1,color);
+ else hline(x1,x0,y1,color);
+
+ if (y1 > y0) vline(x1,y0,y1,color);
+ else vline(x1,y1,y0,color);
+
+ return;
+}
+
+
+
+void SPI_TFT::fillrect(int x0, int y0, int x1, int y1, int color) {
+
+ int h = y1 - y0 + 1;
+ int w = x1 - x0 + 1;
+ int pixel = h * w;
+ window(x0,y0,w,h);
+ wr_cmd(0x22);
+ wr_dat_start();
+ _spi.format(16,3); // pixel are send in 16 bit mode to speed up
+ for (int p=0; p<pixel; p++) {
+ _spi.write(color);
+ }
+ _spi.format(8,3);
+ wr_dat_stop();
+ return;
+}
+
+
+
+void SPI_TFT::locate(int column, int row) {
+ _column = column;
+ char_x = font[1] * column; // get the horz. size of the actual font
+ _row = row;
+}
+
+
+
+int SPI_TFT::columns() {
+ return width() / font[1];
+}
+
+
+
+int SPI_TFT::rows() {
+ return height() / font[2];
+}
+
+
+
+int SPI_TFT::_putc(int value) {
+ if (value == '\n') {
+ _column = 0;
+ char_x = 0;
+ _row++;
+ if (_row >= rows()) {
+ _row = 0;
+ }
+ } else {
+ character(_column, _row, value);
+ _column++;
+ }
+ return value;
+}
+
+
+
+
+void SPI_TFT::character(int col, int row, 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;
+ _column = 0;
+ _row ++;
+ row++;
+ if (_row >= rows()) {
+ _row = 0;
+ row=0;
+ }
+ }
+
+ window(char_x, row * vert,hor,vert); // char box
+ wr_cmd(0x22);
+ 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 SPI_TFT::set_font(unsigned char* f) {
+ font = f;
+}
+
+
+
+void SPI_TFT::Bitmap(unsigned int x, unsigned int y, unsigned int w, unsigned int h,unsigned char *bitmap) {
+ unsigned int i,j;
+ unsigned short *bitmap_ptr = (unsigned short *)bitmap;
+ window(x, y, w, h);
+ wr_cmd(0x22);
+ wr_dat_start();
+ _spi.format(16,3);
+ bitmap_ptr += ((h - 1)*w);
+ for (j = 0; j < h; j++) { //Lines
+ for (i = 0; i < w; i++) { // copy pixel data to TFT
+ _spi.write(*bitmap_ptr); // one line
+ bitmap_ptr++;
+ }
+ bitmap_ptr -= 2*w;
+ }
+ _spi.format(8,3);
+ wr_dat_stop();
+}
\ No newline at end of file