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Created June 8, 2021 16:58
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Hanover FlipDot Display Arduino
#include <Arduino.h>
#include <Wire.h>
#define COLS 96
#define ROWS 16
#define FRAME_SIZE ((ROWS * COLS) / 8)
#define COL_BYTES FRAME_SIZE / 8
#define FOOTER_CHAR 0x03
#define DATA_SIZE FRAME_SIZE * 2
#define BUFFER_SIZE 5 + DATA_SIZE + 3
#define MASTER_EN 9
uint8_t header[] =
{ 0x02,
0x31, // 0 = Text, 1 = Graphics
0x38, // Display Address (8 by default)
0x00, // Resolution Data
0x00, // Resolution Data
};
uint8_t data[DATA_SIZE] = {0x00};
uint8_t buffer[BUFFER_SIZE] = {0x00};
void byte_to_ascii(uint8_t b, uint8_t *twob) {
uint8_t b1 = 0;
uint8_t b2 = 0;
b1 = b >> 4;
if (b1 > 9)
b1 += 0x37;
else
b1 += 0x30;
b2 = b % 16;
if (b2 > 9)
b2 += 0x37;
else
b2 += 0x30;
twob[0] = b1;
twob[1] = b2;
}
uint8_t calc_crc(uint8_t *buffer, size_t len) {
uint8_t sum = 0;
for (int i = 0; i < len; i++) {
sum += buffer[i];
}
return ((sum ^ 0xFF) + 1);
}
void setup() {
pinMode(MASTER_EN, OUTPUT);
Serial.begin(4800);
}
void loop() {
uint8_t crc_b = 0;
uint8_t resolution[2];
uint8_t byte_ascii_buffer[2];
byte_to_ascii(FRAME_SIZE & 0xFF, &header[3]);
buffer[BUFFER_SIZE - 3] = FOOTER_CHAR;
for (int j = 0; j <= 16; j++) {
// calculate byte as two ascii values for address
byte_to_ascii(j, byte_ascii_buffer);
header[2] = byte_ascii_buffer[1];
// copy into send buffer
memcpy(buffer, header, 5);
digitalWrite(MASTER_EN, HIGH);
// set all to on
memset(&buffer[5], 'F', DATA_SIZE);
crc_b = calc_crc(buffer, BUFFER_SIZE - 2); // -2 for CRC bytes
byte_to_ascii(crc_b, &buffer[BUFFER_SIZE - 2]); // set last two bytes to CRC
Serial.write(buffer, sizeof(buffer));
delay(500);
// set all to off
memset(&buffer[5], '0', DATA_SIZE);
crc_b = calc_crc(buffer, BUFFER_SIZE - 2); // -2 for CRC bytes
byte_to_ascii(crc_b, &buffer[BUFFER_SIZE - 2]);
Serial.write(buffer, sizeof(buffer));
delay(500);
digitalWrite(MASTER_EN, LOW);
}
}
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