Add font

.ccls

@@ -0,0 +1,2 @@
+%compile_commands.json
+--sysroot=/usr/arm-none-eabi/

grep

@@ -0,0 +1 @@
+ccls: Unknown command line argument 'main.cc'.  Try: 'ccls --help'

src/main.cc

@@ -2,16 +2,49 @@
 
 #include "hardware/gpio.h"
 #include "hardware/i2c.h"
-#include "pico/error.h"
 #include <pico/stdlib.h>
 #include <pico/stdio.h>
 
-#include <cstdio>
+#include <stdio.h>
+#include <string.h>
 
 #define ADDR 0x3c
 
 static bool failure = false;
 
+#define INVALID_CH (0xff8181ff)
+
+static uint32_t charset[127] = {
+  INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH,
+  INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH,
+  INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH,
+  INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, INVALID_CH, 0x00000000, // this is space
+  // !, ", #, $, %, &, ', (, 
+  0x00bf0000, 0x03000300, 0x5ce85ce8, 0x24ff4a24, 0xc3cc33c3, 0x4834a458, 0x00030000, 0x81423c00,
+  // ), *, +, ,, -, ., /, 0
+  0x3c428100, 0x09060609, 0x00083e08, 0x00408000, 0x08080808, 0x00030300, 0x030c30c0, 0x7E81817E,
+  // 1, 2, 3, 4, 5, 6, 7, 8
+  0x80FF8280, 0x868991E2, 0x76898162, 0xff121418, 0x7189894f, 0x7289897e, 0x0709f101, 0x76898976,
+  // 9, :, ;, <, =, >, ?, @
+  0x7e898946, 0x00666600, 0x00264600, 0x82442810, 0x28282828, 0x10284482, 0x0609b102, INVALID_CH,
+  // A, B, C, D, E, F, G, H
+  0xfe1111fe, 0x768989ff, 0x6681817e, 0x7e8181ff, 0x818989ff, 0x010909ff, 0x7691817e, 0xff0808ff,
+  // I, J, K, L, M, N, O, P
+  0x81ffff81, 0x01ff8141, 0xe31408ff, 0x808080ff, 0xff0606ff, 0xff0804ff, 0x7E81817E, 0x060909ff,
+  // Q, R, S, T, U, V, W, X
+  0xbe41413e, 0xee1111ff, 0x66918966, 0x01ff0101, 0x7f80807f, 0x1fe0e01f, 0xff6060ff, 0xe71818e7,
+  // Y, Z, [, \, ], ^, _, *
+  0x7f90904f, 0x878991e1, 0x818181ff, 0xc0300c03, 0xff818181, 0x0c03030c, 0x80808080, 0x00060600,
+  // a, b, c, d, e, f, g, h
+  0xf0a8a840, 0x609090fe, 0x50888870, 0xfe909060, 0x30a8a870, 0x000212fc, 0x60a48478, 0xe01010fe,
+  // i, j, k, l, m, n, o, p
+  0x00f40000, 0x00748040, 0x885020fe, 0x80807e02, 0xf03030f0, 0xe01010f8, 0x60909060, 0x182424f8,
+  // q, r, s, t, u, v, w, x
+  0xb0484830, 0x000808f0, 0x48a49448, 0x0080907c, 0x70808070, 0x70c0c070, 0x70e0e070, 0x90606090,
+  // y, z, {, |, }, ~, DEL
+  0x7c90904c, 0x90b0d090, 0x81816618, 0x00ff0000, 0x81816618, 0x10081008, INVALID_CH, 
+};
+
 int main(void) {
   stdio_init_all();
 
@@ -21,7 +54,7 @@ int main(void) {
   gpio_set_dir(25, GPIO_OUT);
 
 
-  i2c_init(i2c0, 115200);
+  i2c_init(i2c0, 400000);
   gpio_init(0);
   gpio_init(1);
   gpio_set_function(0, GPIO_FUNC_I2C);
@@ -31,6 +64,9 @@ int main(void) {
 
   busy_wait_ms(100);
 
+  disp.fill(0);
+  disp.puts(0, 0, "Hello, World!");
+  disp.flush();
   while (true) {
     /*
     gpio_put(25, false);
@@ -38,8 +74,6 @@ int main(void) {
     gpio_put(25, true);
     busy_wait_ms(failure ? 50 : 500);
     */
-    disp.test();
-    busy_wait_ms(10);
   }
 
   return 0;
@@ -47,6 +81,7 @@ int main(void) {
 
 static void write_cmd(uint8_t cmd) {
   uint8_t buf[2] = {0x80, cmd};
+
   if (i2c_write_timeout_us(i2c0, ADDR, buf, 2, false, 1000000) < 0) {
     failure = true;
     printf("TX fail\n");
@@ -55,19 +90,9 @@ static void write_cmd(uint8_t cmd) {
   }
 }
 
-static void write_data(uint8_t *data, size_t len) {
-  if (i2c_write_timeout_us(i2c0, ADDR, data, len, false, 1000000) < 0) {
-    failure = true;
-    printf("data fail\n");
-  } else {
-    printf("data succ\n");
-  }
-}
-
-
 ssd1306::ssd1306() {
     write_cmd(SET_DISP | 0x00); // Off
-                                //
+
     write_cmd(SET_MUX_RATIO); // The height
     write_cmd(63); // The height
 
@@ -90,7 +115,7 @@ ssd1306::ssd1306() {
     write_cmd(0x80);
 
     write_cmd(SET_PRECHARGE);
-    write_cmd(0xF1);
+    write_cmd(0x22);
     write_cmd(SET_CHARGE_PUMP);
     write_cmd(0x14);
 
@@ -99,19 +124,64 @@ ssd1306::ssd1306() {
 
     write_cmd(SET_DISP | 0x01);
 
+    set_coordinates(0, 127, 0, 7);
+
     write_cmd(SET_MEM_ADDR); 
     write_cmd(0x00); // Horizontal
 
-    write_cmd(SET_COL_ADDR);
-    write_cmd(0);
-    write_cmd(127);
-    write_cmd(SET_PAGE_ADDR);
-    write_cmd(0);
-    write_cmd(0x63);
+    for(size_t i = 0; i < (128*8); i++) {
+      uint8_t test_buf[] = {0x40, 0x00};
+      i2c_write_timeout_us(i2c0, ADDR, test_buf, 2, false, 10000000);
+    }
 }
 
 void ssd1306::test() {
-  static bool flip = true;
-  uint8_t buf[2] = {0x40, 0xFF};
-  write_data(buf, 2);
+  memcpy(m_display_buffer+1, &charset['i'-1], 4*16);
+}
+
+void ssd1306::fill(uint8_t val) {
+  for(size_t i = 1; i < sizeof(m_display_buffer); i++) {
+    m_display_buffer[i] = val;
+  }
+}
+
+void ssd1306::set_coordinates(uint8_t start_x, uint8_t end_x, uint8_t start_y, uint8_t end_y){
+  write_cmd(SET_COL_ADDR);
+  write_cmd(start_x);
+  write_cmd(end_x);
+  write_cmd(SET_PAGE_ADDR);
+  write_cmd(start_y);
+  write_cmd(end_y);
+}
+
+void ssd1306::flush() {
+  set_coordinates(0, 127, 0, 7);
+  write_cmd(SET_MEM_ADDR); 
+  write_cmd(0x00); // Horizontal
+
+  if (i2c_write_timeout_us(i2c0, ADDR, m_display_buffer, sizeof(m_display_buffer), false, 1000000) < 0) {
+    failure = true;
+    printf("data fail\n");
+  } else {
+    printf("data succ\n");
+  }
+}
+
+void ssd1306::put_char(uint8_t row, uint8_t col, char c) {
+  if (row % 4 != 0) return;
+
+  memcpy(&m_display_buffer[1 + (row + (128*col))], &charset[c-1], 4);
+}
+
+void ssd1306::puts(uint8_t row, uint8_t col, const char *str) {
+  // Start index
+  size_t buf_idx = 1+(row + (128*col));
+
+  while(*str != '\0') {
+    memcpy(m_display_buffer+buf_idx, &charset[*str-1], 4);
+
+    buf_idx+=4;
+    str++;
+  }
+
 }

src/main.hh

@@ -21,11 +21,26 @@
 #define SET_VCOM_DESEL (0xDB)
 #define SET_CHARGE_PUMP (0x8D)
 
+#define WIDTH 128
+#define HEIGHT 64
+
 class ssd1306 {
+private:
+  uint8_t m_display_buffer[WIDTH*(HEIGHT/8)+1] = {0x40};
 public:
   ssd1306();
 
   void poweron();
   void test();
+
+  void fill(uint8_t val);
+  
+  void flush();
+
+  void set_coordinates(uint8_t start_x, uint8_t end_x, uint8_t start_y, uint8_t end_y);
+
+  void put_char(uint8_t row, uint8_t col, char c);
+
+  void puts(uint8_t row, uint8_t col, const char* str);
 };