224 lines
8.0 KiB
C
224 lines
8.0 KiB
C
|
|
/**
|
|
Quick test for sending some visible data to a SSD1306 display connected
|
|
via I2C. This means not to test the display, but the I2C implementation.
|
|
|
|
To run this test, add this line to board or printer config.h:
|
|
|
|
#define I2C
|
|
|
|
With this done, a welcome message should appear on the display. Without
|
|
these additions, the binary size should be as small as the commit before.
|
|
*/
|
|
|
|
#ifdef I2C_TEST
|
|
|
|
#include <string.h>
|
|
#include "config_wrapper.h"
|
|
#include "displaybus.h"
|
|
|
|
|
|
#define DISPLAY_I2C_ADDRESS (0x3C << 1)
|
|
|
|
const uint8_t PROGMEM display_init[] = {
|
|
0x00, // Command marker.
|
|
0xAE, // Display off.
|
|
0xD5, 0x80, // Display clock divider (reset).
|
|
0xA8, 0x1F, // 1/32 duty.
|
|
0x40 | 0x00, // Start line (reset).
|
|
0x20, 0x02, // Page addressing mode (reset).
|
|
0x22, 0x00, 0x03, // Start and end page in horiz./vert. addressing mode[1].
|
|
0x21, 0x00, 0x7F, // Start and end column in horiz./vert. addressing mode.
|
|
0xA0 | 0x00, // No segment remap (reset).
|
|
0xC0 | 0x00, // Normal com pins mapping (reset).
|
|
0xDA, 0x02, // Sequental without remap com pins.
|
|
0x81, 0x7F, // Contrast (reset).
|
|
0xDB, 0x20, // Vcomh (reset).
|
|
0xD9, 0xF1, // Precharge period.
|
|
0x8D, 0x14, // Charge pump.
|
|
0xA6, // Positive display.
|
|
0xA4, // Resume display.
|
|
0xAF // Display on.
|
|
};
|
|
// [1] Do not set this to 0x00..0x07 on a 32 pixel high display, or vertical
|
|
// addressing mode will mess up. 32 pixel high displays have only 4 pages
|
|
// (0..3), still addressing logic accepts, but can't deal with the 0..7
|
|
// meant for 64 pixel high displays.
|
|
|
|
typedef struct {
|
|
uint8_t columns;
|
|
uint8_t data[4];
|
|
} SYMBOL;
|
|
|
|
const SYMBOL PROGMEM font_8x4[] = {
|
|
{2, {0x00, 0x00, 0x00, 0x00}}, /* space */
|
|
{3, {0x0C, 0x5E, 0x0C, 0x00}}, /* excl_mark */
|
|
{3, {0x03, 0x00, 0x03, 0x00}}, /* quot_mark */
|
|
{4, {0x74, 0x2E, 0x74, 0x2E}}, /* num_sign */
|
|
{4, {0x24, 0xCA, 0x53, 0x24}}, /* dlr_sign */
|
|
{4, {0x44, 0x30, 0x0C, 0x22}}, /* prc_sign */
|
|
{4, {0x33, 0x4D, 0x22, 0x00}}, /* ampersand */
|
|
{2, {0x02, 0x01, 0x00, 0x00}}, /* apostrophe */
|
|
{2, {0x3E, 0x41, 0x00, 0x00}}, /* lparent */
|
|
{2, {0x41, 0x3E, 0x00, 0x00}}, /* rparent */
|
|
{3, {0x14, 0x3E, 0x14, 0x00}}, /* asterisk */
|
|
{3, {0x08, 0x1C, 0x08, 0x00}}, /* plus_sign */
|
|
{2, {0x40, 0x20, 0x00, 0x00}}, /* comma */
|
|
{3, {0x08, 0x08, 0x08, 0x00}}, /* minus_sign */
|
|
{1, {0x20, 0x00, 0x00, 0x00}}, /* dot */
|
|
{3, {0x30, 0x0C, 0x03, 0x00}}, /* solidus */
|
|
|
|
{4, {0x3E, 0x41, 0x41, 0x3E}}, /* num_0 */
|
|
{3, {0x44, 0x7F, 0x40, 0x00}}, /* num_1 */
|
|
{4, {0x62, 0x51, 0x49, 0x46}}, /* num_2 */
|
|
{4, {0x22, 0x49, 0x49, 0x36}}, /* num_3 */
|
|
{4, {0x0F, 0x08, 0x08, 0x7E}}, /* num_4 */
|
|
{4, {0x27, 0x45, 0x45, 0x39}}, /* num_5 */
|
|
{4, {0x3E, 0x45, 0x45, 0x38}}, /* num_6 */
|
|
{4, {0x01, 0x71, 0x09, 0x07}}, /* num_7 */
|
|
{4, {0x36, 0x49, 0x49, 0x36}}, /* num_8 */
|
|
{4, {0x26, 0x49, 0x49, 0x3E}}, /* num_9 */
|
|
{1, {0x24, 0x00, 0x00, 0x00}}, /* colon */
|
|
{2, {0x40, 0x24, 0x00, 0x00}}, /* semicolon */
|
|
{3, {0x08, 0x14, 0x22, 0x00}}, /* less_sign */
|
|
{3, {0x14, 0x14, 0x14, 0x00}}, /* equal_sign */
|
|
{3, {0x22, 0x14, 0x08, 0x00}}, /* great_sign */
|
|
{3, {0x02, 0x51, 0x0E, 0x00}}, /* ques_mark */
|
|
|
|
{4, {0x7E, 0x99, 0xA5, 0x3E}}, /* at */
|
|
{3, {0x7E, 0x11, 0x7F, 0x00}}, /* a_cap */
|
|
{3, {0x7F, 0x49, 0x36, 0x00}}, /* b_cap */
|
|
{3, {0x3E, 0x41, 0x22, 0x00}}, /* c_cap */
|
|
{3, {0x7F, 0x41, 0x3E, 0x00}}, /* d_cap */
|
|
{3, {0x7F, 0x49, 0x41, 0x00}}, /* e_cap */
|
|
{3, {0x7F, 0x09, 0x01, 0x00}}, /* f_cap */
|
|
{3, {0x3E, 0x41, 0x71, 0x00}}, /* g_cap */
|
|
{3, {0x7F, 0x08, 0x7F, 0x00}}, /* h_cap */
|
|
{3, {0x41, 0x7F, 0x41, 0x00}}, /* i_cap */
|
|
{3, {0x40, 0x41, 0x3F, 0x00}}, /* j_cap */
|
|
{3, {0x7F, 0x0C, 0x73, 0x00}}, /* k_cap */
|
|
{3, {0x7F, 0x40, 0x40, 0x00}}, /* l_cap */
|
|
{3, {0x7F, 0x06, 0x7F, 0x00}}, /* m_cap */
|
|
{3, {0x7F, 0x3C, 0x7F, 0x00}}, /* n_cap */
|
|
{3, {0x3E, 0x41, 0x3E, 0x00}}, /* o_cap */
|
|
|
|
{3, {0x7F, 0x11, 0x0E, 0x00}}, /* p_cap */
|
|
{3, {0x3E, 0x41, 0xBE, 0x00}}, /* q_cap */
|
|
{3, {0x7F, 0x11, 0x6E, 0x00}}, /* r_cap */
|
|
{3, {0x46, 0x49, 0x31, 0x00}}, /* s_cap */
|
|
{3, {0x01, 0x7F, 0x01, 0x00}}, /* t_cap */
|
|
{3, {0x3F, 0x40, 0x7F, 0x00}}, /* u_cap */
|
|
{3, {0x3F, 0x40, 0x3F, 0x00}}, /* v_cap */
|
|
{3, {0x7F, 0x30, 0x7F, 0x00}}, /* w_cap */
|
|
{3, {0x73, 0x0C, 0x73, 0x00}}, /* x_cap */
|
|
{3, {0x0F, 0x70, 0x0F, 0x00}}, /* y_cap */
|
|
{3, {0x61, 0x5D, 0x47, 0x00}}, /* z_cap */
|
|
{2, {0x7F, 0x41, 0x00, 0x00}}, /* lq_bracket */
|
|
{3, {0x06, 0x18, 0x60, 0x00}}, /* rev_solidus */
|
|
{2, {0x41, 0x7F, 0x00, 0x00}}, /* rq_bracket */
|
|
{3, {0x02, 0x01, 0x02, 0x00}}, /* circumflex_accent */
|
|
{3, {0x40, 0x40, 0x40, 0x00}}, /* low_line */
|
|
|
|
{2, {0x01, 0x02, 0x00, 0x00}}, /* grave_accent */
|
|
{3, {0x30, 0x48, 0x78, 0x00}}, /* a_sml */
|
|
{3, {0x7E, 0x48, 0x30, 0x00}}, /* b_sml */
|
|
{3, {0x30, 0x48, 0x48, 0x00}}, /* c_sml */
|
|
{3, {0x30, 0x48, 0x7E, 0x00}}, /* d_sml */
|
|
{3, {0x30, 0x58, 0x58, 0x00}}, /* e_sml */
|
|
{2, {0x7C, 0x12, 0x00, 0x00}}, /* f_sml */
|
|
{3, {0x10, 0xA8, 0x70, 0x00}}, /* g_sml */
|
|
{3, {0x7E, 0x08, 0x70, 0x00}}, /* h_sml */
|
|
{1, {0x74, 0x00, 0x00, 0x00}}, /* i_sml */
|
|
{2, {0x80, 0x7A, 0x00, 0x00}}, /* j_sml */
|
|
{3, {0x7E, 0x10, 0x68, 0x00}}, /* k_sml */
|
|
{2, {0x3E, 0x40, 0x00, 0x00}}, /* l_sml */
|
|
{3, {0x78, 0x38, 0x70, 0x00}}, /* m_sml */
|
|
{3, {0x78, 0x08, 0x70, 0x00}}, /* n_sml */
|
|
{3, {0x30, 0x48, 0x30, 0x00}}, /* o_sml */
|
|
|
|
{3, {0xF8, 0x48, 0x30, 0x00}}, /* p_sml */
|
|
{3, {0x30, 0x48, 0xF8, 0x00}}, /* q_sml */
|
|
{2, {0x70, 0x08, 0x00, 0x00}}, /* r_sml */
|
|
{3, {0x50, 0x58, 0x28, 0x00}}, /* s_sml */
|
|
{2, {0x3E, 0x44, 0x00, 0x00}}, /* t_sml */
|
|
{3, {0x38, 0x40, 0x78, 0x00}}, /* u_sml */
|
|
{3, {0x38, 0x40, 0x38, 0x00}}, /* v_sml */
|
|
{3, {0x78, 0x60, 0x78, 0x00}}, /* w_sml */
|
|
{3, {0x68, 0x10, 0x68, 0x00}}, /* x_sml */
|
|
{3, {0x18, 0xA0, 0x78, 0x00}}, /* y_sml */
|
|
{3, {0x68, 0x68, 0x58, 0x00}}, /* z_sml */
|
|
{3, {0x08, 0x36, 0x41, 0x00}}, /* left_curly_bracket */
|
|
{1, {0x7F, 0x00, 0x00, 0x00}}, /* vertical_line */
|
|
{3, {0x41, 0x36, 0x08, 0x00}}, /* rigth_curly_bracket */
|
|
{4, {0x02, 0x01, 0x02, 0x01}}, /* tilde */
|
|
{4, {0x00, 0x00, 0x00, 0x00}} /* del */
|
|
};
|
|
|
|
#define FONT_SYMBOLS_SPACE 1
|
|
|
|
static void i2c_test(void) {
|
|
uint16_t i;
|
|
const char* message = "Welcome to Teacup";
|
|
|
|
for (i = 0; i < sizeof(display_init); i++) {
|
|
// Send last byte with 'last_byte' set.
|
|
displaybus_write(pgm_read_byte(&display_init[i]),
|
|
(i == sizeof(display_init) - 1));
|
|
}
|
|
|
|
/**
|
|
Clear the screen. As this display supports many sophisticated commands,
|
|
but not a simple 'clear', we have to overwrite the entire memory with
|
|
zeros, byte by byte.
|
|
*/
|
|
// Set horizontal adressing mode.
|
|
displaybus_write(0x00, 0);
|
|
displaybus_write(0x20, 0);
|
|
displaybus_write(0x00, 1);
|
|
|
|
// Write 512 zeros.
|
|
displaybus_write(0x40, 0);
|
|
for (i = 0; i < 512; i++) {
|
|
displaybus_write(0x00, (i == 511));
|
|
}
|
|
|
|
// Return to page adressing mode.
|
|
displaybus_write(0x00, 0);
|
|
displaybus_write(0x20, 0);
|
|
displaybus_write(0x02, 1);
|
|
|
|
/**
|
|
Setup cursor on display.
|
|
|
|
"Welcome to Teacup" is 64 pixel columns wide, entire display is
|
|
128 columns, so we offset by 32 columns to get it to the center.
|
|
*/
|
|
displaybus_write(0x00, 0);
|
|
// Line 1.
|
|
displaybus_write(0xB0 | 1, 0);
|
|
// Column 32.
|
|
displaybus_write(0x00 | (32 & 0x0F), 0);
|
|
displaybus_write(0x10 | ((32 >> 4) & 0x0F), 1);
|
|
|
|
// Render text to bitmap to display.
|
|
displaybus_write(0x40, 0);
|
|
while (*message) {
|
|
uint8_t index = (uint8_t)*message - 0x20;
|
|
|
|
// Send the character bitmap.
|
|
for (i = 0; i < pgm_read_byte(&font_8x4[index].columns); i++) {
|
|
displaybus_write(pgm_read_byte(&font_8x4[index].data[i]), 0);
|
|
}
|
|
// Send space between characters.
|
|
for (i = 0; i < FONT_SYMBOLS_SPACE; i++) {
|
|
displaybus_write(0x00, 0);
|
|
}
|
|
|
|
message++;
|
|
}
|
|
// Send another space for transmission end.
|
|
displaybus_write(0x00, 1);
|
|
}
|
|
|
|
#endif /* I2C_TEST */
|