* Initial version
*
* $DESCRIPTION$
+ * Basic driver for the ST7735s TFT screen. Initializes the screen
+ * Low-level commands can be called by tft_command. See header (.h)
+ * file for an overview of all commands. tft_command can accepts
+ * an unlimited amount of data or parameter commands.
*
* $USAGE$
+ * I added the following functionality:
+ * a. tft_fill: fills a certain area of the screen
+ * b. tft_setpixel: sets a single pixel
+ * c. tft_putc, tft_put: outputs a char/string to the screen, starts
+ * at the upper top right and tracks the position. If the screen is
+ * full, it 'scrolls' automatically. So you basically have a mini
+ * sized terminal. You can link standard output to this function!
*
* */
#include <lib/regfunc.h>
#include <lib/string.h>
#include <lib/tinyprintf.h>
+#include <lib/fonts/wogfont.h>
+#include <drivers/uart.h>
#include <drivers/st7735s.h>
#define TIMEOUT 500
#define SCRWIDTH 132
#define SCRHEIGHT 132
+#define STARTX 5
+#define STARTY 5
+#define XPOS(x) (x * 6)
+#define YPOS(y) (y * 8)
+#define BUFFER 352
+
+
+static struct {
+ uint16_t cpos;
+ uint8_t * textmemptr;
+ uint8_t buf[BUFFER];
+ uint8_t x;
+ uint8_t y;
+} tftscreen;
void tft_init() {
+ tftscreen.x = 0;
+ tftscreen.y = 0;
+ tftscreen.cpos = 0;
+ tftscreen.textmemptr = tftscreen.buf;
+
+ memset(tftscreen.buf, 0x00, 352);
+
/* Peripherial init */
rsetbit(RCC_APB1ENR, 14); // enable SPI2
rsetbit(RCC_APB2ENR, 3); // enable GPIOB
/* Before turning on the display, fill the display
* so no random display data is shown */
- tft_fill(0,0,SCRWIDTH-1,SCRHEIGHT-1,0x001F);
- tft_setpixel(50,50,0xFFFF);
-
+ tft_fill(0,0,SCRWIDTH-1,SCRHEIGHT-1,0x0000);
+
/* Turn on */
tft_command(TFT_NORON, 0);
_block(10000);
tft_command(TFT_DISPON, 0);
_block(100000);
-
-
- /* //_block(10000);
-
- tft_command(TFT_CASET, 4, 0x00, 0x08, 0x00, 0x09);
- tft_command(TFT_RASET, 4, 0x00, 0x08, 0x00, 0x09);
- tft_command(TFT_RAMRD, 0);
-
- //tft_command(0x0C, 0);
- //tft_command(0x0A, 0);
- rclrbit(SPI2_CR1, 14); // receive
-
- while(!rchkbit(SPI2_SR, 0));
- uint8_t chip_id = *SPI2_DR;
- printf("COLMOD: %#x\n", chip_id); */
-
- rclrbit(SPI2_CR1, 8); // deselect
}
/* Helper function */
tft_command(TFT_CASET, 4, 0x00, x, 0x00, x+1);
tft_command(TFT_RASET, 4, 0x00, y, 0x00, y+1);
- tft_command(TFT_RAMWR, 2, (uint8_t) (color >> 8), (uint8_t) (color & 0xFF));
+tft_command(TFT_RAMWR, 2, (uint8_t) (color >> 8), (uint8_t) (color & 0xFF));
return 0;
}
+
+/* Basic puts function that loops over a string */
+int tft_puts(char * str) {
+
+ for (int i = 0; i < strlen(str); i++) {
+ tft_putc(0xFFFF, 0x0000, str[i]);
+
+ }
+
+}
+
+/* Used by scroll function to overwrite and clear the last
+ * line on the screen */
+void tft_clrln() {
+
+ tft_puts(" ");
+ tftscreen.buf[BUFFER - 21] = '\0';
+ tftscreen.cpos -= 21;
+ tftscreen.y = 14;
+}
+
+/* Text scroll function
+ * Refeed the buffer */
+int tft_scroll() {
+
+ /* Scroll the buffer */
+ memcpy(tftscreen.textmemptr, tftscreen.textmemptr + 21, BUFFER - 21);
+ tftscreen.buf[BUFFER - 21] = '\0';
+
+ tftscreen.x = 0;
+ tftscreen.y = 0;
+ tftscreen.cpos = 0;
+
+ tft_puts(tftscreen.buf); // CHECK: ending
+ tftscreen.y = 14;
+ tftscreen.x = 0;
+ tftscreen.cpos = BUFFER - 21;
+}
+
+/* Fills a line with blank characters, returns to
+ * the next line */
+void tft_nl() {
+
+ uint8_t blanks = 21 - tftscreen.x;
+
+ // filler with blank spaces
+ for (int i = 0; i < blanks; i++) {
+ tft_putc(0xFFFF, 0x0000, ' ');
+ }
+
+}
+
/* Low-level function to print a character to the display
- * Should not be used directly, since it does not set
- * the location */
-int tft_putc(uint16_t fg, uint16_t bg, char c) {
+ * Should not be used directly */
+int tft_putc(uint16_t fg, uint16_t bg, int c) {
+
+ int totalpixels = 35;
+ int column = 0;
+ int row = 0;
+ uint8_t current;
+
+ if (c == '\n') {
+ if (tftscreen.y == 14) {
+ tft_nl();
+ return 1;
+ }
+ else {
+ tft_nl();
+ //if (tftscreen.y < 15)
+ return 1;
+ }
+ }
+
+ if (tftscreen.y >= 15) {
+ tft_scroll();
+ }
+
+ tft_command(TFT_CASET, 4, 0x00, STARTX + XPOS(tftscreen.x), 0x00, (STARTX + 4) + XPOS(tftscreen.x));
+ tft_command(TFT_RASET, 4, 0x00, STARTY + YPOS(tftscreen.y), 0x00, (STARTY + 6) + YPOS(tftscreen.y));
+
+ tft_command(TFT_RAMWR, 0);
+ rsetbit(GPIOC_ODR, 6); // data = 1
+ for (int i = 0; i < totalpixels; i++) {
+
+ current = ASCII5x7[(c * 5) + column];
+
+ if ((current >> (7 - row)) & 0x1) {
+ rwrite(SPI2_DR, (uint8_t) (fg >> 8));
+ if (!txbuf_empty())
+ return -1;
+ rwrite(SPI2_DR, (uint8_t) (fg & 0xFF));
+ if (!txbuf_empty())
+ return -1;
+ }
+ else {
+ rwrite(SPI2_DR, (uint8_t) (bg >> 8));
+ if (!txbuf_empty())
+ return -1;
+ rwrite(SPI2_DR, (uint8_t) (bg & 0xFF));
+ if (!txbuf_empty())
+ return -1;
+ }
- // lookup table
+ /* Algoritm dependent on draw mode: top down, left right */
+ column++;
+ if (column > 4) {
+ column = 0;
+ row++;
+ }
+ }
+ tftscreen.buf[tftscreen.cpos] = c;
+ tftscreen.cpos++;
+
+ tftscreen.x++;
+ if (tftscreen.x > 20) {
+ tftscreen.x = 0;
+ tftscreen.y++;
+ }
+
+ return 0;
}
-/* Invokes commands with a variable list of paramaters. Sending paramters
+
+/* Invokes commands with a variable list of paramaters. Sending parameters
* requires the D/CX line to be high */
int tft_command(uint8_t cmd, int argsc, ...) {
projects / cortex-from-scratch / blobdiff