commit ef0bb65fdfd94ae4b6cf06ef7487ed7cd8a36aac
Author: Fluffy-Bean <michal-gdula@protonmail.com>
Date:   Sun Jun 22 13:13:01 2025 +0100

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..485dee6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
diff --git a/lib_sharp.c b/lib_sharp.c
new file mode 100644
index 0000000..2b3633f
--- /dev/null
+++ b/lib_sharp.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "hardware/gpio.h"
+#include "hardware/spi.h"
+#include "lib_sharp.h"
+
+sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t * spi, uint8_t cs)
+{
+    gpio_put(cs, false);
+
+    sharp_display_t display = {
+        .width = width,
+        .height = height,
+        .cs = cs,
+        .vcom = CMD_VCOM,
+        .framebuffer = (uint8_t *)malloc((width * height) / 8),
+        .spi = (spi)
+    };
+
+    return display;
+}
+
+bool sharp_display_error(sharp_display_t * display)
+{
+    return (display == NULL || display->framebuffer == NULL);
+}
+
+void sharp_display_refresh_screen(sharp_display_t * display)
+{
+    gpio_put(display->cs, true);
+    sharp_display_toggle_vcom(display);
+
+    // These are sizes without the current line and end of line data
+    uint16_t line_size = display->width / 8;
+    uint16_t frame_size = (display->width * display->height) / 8;
+
+    uint16_t buff_size = 1 + display->height * (1 + (display->width / 8) + 1) + 1;
+    uint8_t buff[buff_size];
+
+    uint16_t buff_offset = 0;
+
+    buff[buff_offset] = display->vcom | CMD_WRITE;
+    buff_offset += 1;
+
+    for (int i = 0; i < frame_size; i += line_size)
+    {
+        // Current line
+        buff[buff_offset] = ((i + 1) / (display->width / 8)) + 1;
+        buff_offset += 1;
+
+        // Line data
+        memcpy(buff + buff_offset, display->framebuffer + i, line_size);
+        buff_offset += line_size;
+
+        // End of line
+        buff[buff_offset] = 0x00;
+        buff_offset += 1;
+    }
+
+    // End of transition
+    buff[buff_offset] = 0x00;
+    buff_offset += 1;
+
+    if (buff_size != buff_offset)
+    {
+        printf("Sussy buffer size offset\n");
+    }
+
+    spi_write_blocking(display->spi, buff, buff_offset);
+    gpio_put(display->cs, false);
+}
+
+void sharp_display_clear_screen(sharp_display_t * display)
+{
+    sharp_display_clear_buffer(display);
+    gpio_put(display->cs, true);
+
+    uint8_t buff[2] = {display->vcom | CMD_CLEAR, 0x00};
+
+    spi_write_blocking(display->spi, buff, 2);
+
+    sharp_display_toggle_vcom(display);
+    gpio_put(display->cs, false);
+}
+
+void sharp_display_clear_buffer(sharp_display_t * display)
+{
+    memset(display->framebuffer, 0, display->width * display->height / 8);
+}
+
+void sharp_display_toggle_vcom(sharp_display_t * display)
+{
+    display->vcom = display->vcom ? 0x00 : CMD_VCOM;
+}
diff --git a/lib_sharp.h b/lib_sharp.h
new file mode 100644
index 0000000..6c45c2f
--- /dev/null
+++ b/lib_sharp.h
@@ -0,0 +1,30 @@
+#ifndef LIB_SHARP_H
+#define LIB_SHARP_H
+
+#include "hardware/spi.h"
+
+#define CMD_WRITE 0x80
+#define CMD_CLEAR 0x20
+#define CMD_VCOM 0x40
+
+#define SWAP(a, b) { a ^= b; b ^= a; a ^= b; }
+
+typedef struct sharp_display {
+    uint16_t width, height;
+    uint8_t cs;
+    uint8_t vcom;
+    uint8_t * framebuffer;
+    spi_inst_t * spi;
+} sharp_display_t;
+
+sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t * spi, uint8_t cs);
+bool sharp_display_error(sharp_display_t * display);
+void sharp_display_refresh_screen(sharp_display_t * display);
+void sharp_display_clear_screen(sharp_display_t * display);
+void sharp_display_clear_buffer(sharp_display_t * display);
+void sharp_display_toggle_vcom(sharp_display_t * display);
+
+void sharp_display_draw_pixel(sharp_display_t *display, int x, int y, bool color);
+void sharp_display_draw_circle(sharp_display_t *display, int x0, int y0, int radius, bool color);
+
+#endif //LIB_SHARP_H