* 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/tinyprintf.h>
#include <lib/fonts/wogfont.h>
+#include <drivers/uart.h>
#include <drivers/st7735s.h>
#define TIMEOUT 500
#define YPOS(y) (y * 8)
#define BUFFER 352
+
static struct {
uint16_t cpos;
uint8_t * textmemptr;
uint8_t y;
} tftscreen;
-void tft_clrln();
-int tft_scroll();
-int tft_puts();
-int tft_putc(uint16_t, uint16_t, char);
-int tft_putc_small(uint16_t, uint16_t, int);
void tft_init() {
tftscreen.x = 0;
/* Before turning on the display, fill the display
* so no random display data is shown */
tft_fill(0,0,SCRWIDTH-1,SCRHEIGHT-1,0x0000);
- //tft_setpixel(50,50,0xFFFF);
- //tft_putc(0xFFFF, 0x0000, 's');
- //tft_putc_small(0xFFFF, 0x0000, 's');
-
- //tft_puts("root#");
- //tft_puts("f");
-
/* Turn on */
tft_command(TFT_NORON, 0);
tft_command(TFT_DISPON, 0);
_block(100000);
- tft_puts("rrrrrrrrrrrrrrrrrrrrrooooooooooooooooooooooooooooooooooooooooootttttttttttttttttttttoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooootttttttttttttttttttttoooooooooooooooooooootttttttttttttttttttttoooooooooooooooooooootttttttttttttttttttttoooooooooooooooooooootttttttttttttttttttttooooooooooooooooooooott");
-
-
-
- /* //_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 */
return 0;
}
-/* 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) {
-
- //chipselect();
- // Bitmaps are 9 by 8
- uint8_t databuf[9] = {0x73, 0xFB, 0xDB, 0xDB, 0xDB, 0xDB, 0xDB, 0xDF, 0xDA};
- //uint8_t databuf[9] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
-
- int totalpixels = 72;
- int column = 0;
- int row = 0;
- uint8_t current;
-
- tft_command(TFT_CASET, 4, 0x00, 10, 0x00, 18);
- tft_command(TFT_RASET, 4, 0x00, 10, 0x00, 17);
- tft_command(TFT_RAMWR, 0);
- rsetbit(GPIOC_ODR, 6); // data = 1
- for (int i = 0; i < totalpixels; i++) {
-
- current = databuf[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;
- }
-
- /* Algoritm dependent on draw mode: top down, left right */
- column++;
- if (column > 8) {
- column = 0;
- row++;
- }
- }
- return 0;
- // lookup table
-}
-
+/* Basic puts function that loops over a string */
int tft_puts(char * str) {
- //uint8_t temp;
- //char * string = "root#root#root#root#root#root#root#";
-
- //printf("string length: %d\n", strlen(string));
-
- //for (int i = 0; i < 35; i++) {
for (int i = 0; i < strlen(str); i++) {
-
- 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_putc_small(0xFFFF, 0x0000, str[i]);
-
- tftscreen.buf[tftscreen.cpos] = str[i];
- tftscreen.cpos++;
+ tft_putc(0xFFFF, 0x0000, str[i]);
- tftscreen.x++;
- if (tftscreen.x > 20) {
- tftscreen.x = 0;
- tftscreen.y++;
- }
- // if screen.y at end, "scroll" line
}
-
}
+/* 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;
- //for(;;);
tftscreen.y = 14;
}
/* Scroll the buffer */
memcpy(tftscreen.textmemptr, tftscreen.textmemptr + 21, BUFFER - 21);
- for (int i = 21; i >= 0; i--)
- tftscreen.buf[BUFFER - 21] = '\0';
-
- printf(tftscreen.buf);
- //for(;;);
+ tftscreen.buf[BUFFER - 21] = '\0';
tftscreen.x = 0;
tftscreen.y = 0;
tftscreen.cpos = 0;
-
+
tft_puts(tftscreen.buf); // CHECK: ending
- printf("screen.y %d", tftscreen.y);
- tft_clrln();
+ tftscreen.y = 14;
+ tftscreen.x = 0;
+ tftscreen.cpos = BUFFER - 21;
}
-int tft_putc_small(uint16_t fg, uint16_t bg, int c) {
+/* Fills a line with blank characters, returns to
+ * the next line */
+void tft_nl() {
- //chipselect();
- // Bitmaps are 5 by 7
- //uint8_t databuf[5] = {0xF6, 0x92, 0x92, 0x92, 0xDE};
-
+ 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 */
+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];
- //current = databuf[column];
if ((current >> (7 - row)) & 0x1) {
rwrite(SPI2_DR, (uint8_t) (fg >> 8));
row++;
}
}
+ tftscreen.buf[tftscreen.cpos] = c;
+ tftscreen.cpos++;
+ tftscreen.x++;
+ if (tftscreen.x > 20) {
+ tftscreen.x = 0;
+ tftscreen.y++;
+ }
return 0;
- // lookup table
}
projects / cortex-from-scratch / blobdiff