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Merge pull request #41 from dmadison/7seg_strings
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Added ASCII and string support for 7-segment backpack
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@caternuson
caternuson authored Oct 6, 2021
2 parents 0dd1ed9 + f4959db commit a2d9473
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Showing 3 changed files with 222 additions and 35 deletions.
198 changes: 171 additions & 27 deletions Adafruit_LEDBackpack.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,26 +51,107 @@
} ///< 16-bit var swap
#endif

static const uint8_t numbertable[] = {
0x3F, /* 0 */
0x06, /* 1 */
0x5B, /* 2 */
0x4F, /* 3 */
0x66, /* 4 */
0x6D, /* 5 */
0x7D, /* 6 */
0x07, /* 7 */
0x7F, /* 8 */
0x6F, /* 9 */
0x77, /* a */
0x7C, /* b */
0x39, /* C */
0x5E, /* d */
0x79, /* E */
0x71, /* F */
static const PROGMEM uint8_t sevensegfonttable[] = {

0b00000000, // (space)
0b10000110, // !
0b00100010, // "
0b01111110, // #
0b01101101, // $
0b11010010, // %
0b01000110, // &
0b00100000, // '
0b00101001, // (
0b00001011, // )
0b00100001, // *
0b01110000, // +
0b00010000, // ,
0b01000000, // -
0b10000000, // .
0b01010010, // /
0b00111111, // 0
0b00000110, // 1
0b01011011, // 2
0b01001111, // 3
0b01100110, // 4
0b01101101, // 5
0b01111101, // 6
0b00000111, // 7
0b01111111, // 8
0b01101111, // 9
0b00001001, // :
0b00001101, // ;
0b01100001, // <
0b01001000, // =
0b01000011, // >
0b11010011, // ?
0b01011111, // @
0b01110111, // A
0b01111100, // B
0b00111001, // C
0b01011110, // D
0b01111001, // E
0b01110001, // F
0b00111101, // G
0b01110110, // H
0b00110000, // I
0b00011110, // J
0b01110101, // K
0b00111000, // L
0b00010101, // M
0b00110111, // N
0b00111111, // O
0b01110011, // P
0b01101011, // Q
0b00110011, // R
0b01101101, // S
0b01111000, // T
0b00111110, // U
0b00111110, // V
0b00101010, // W
0b01110110, // X
0b01101110, // Y
0b01011011, // Z
0b00111001, // [
0b01100100, //
0b00001111, // ]
0b00100011, // ^
0b00001000, // _
0b00000010, // `
0b01011111, // a
0b01111100, // b
0b01011000, // c
0b01011110, // d
0b01111011, // e
0b01110001, // f
0b01101111, // g
0b01110100, // h
0b00010000, // i
0b00001100, // j
0b01110101, // k
0b00110000, // l
0b00010100, // m
0b01010100, // n
0b01011100, // o
0b01110011, // p
0b01100111, // q
0b01010000, // r
0b01101101, // s
0b01111000, // t
0b00011100, // u
0b00011100, // v
0b00010100, // w
0b01110110, // x
0b01101110, // y
0b01011011, // z
0b01000110, // {
0b00110000, // |
0b01110000, // }
0b00000001, // ~
0b00000000, // del
};

static const uint16_t alphafonttable[] PROGMEM = {
static const PROGMEM uint16_t alphafonttable[] = {

0b0000000000000001, 0b0000000000000010, 0b0000000000000100,
0b0000000000001000, 0b0000000000010000, 0b0000000000100000,
Expand Down Expand Up @@ -479,15 +560,19 @@ void Adafruit_BicolorMatrix::drawPixel(int16_t x, int16_t y, uint16_t color) {

Adafruit_7segment::Adafruit_7segment(void) { position = 0; }

void Adafruit_7segment::print(const String &c) { write(c.c_str(), c.length()); }

void Adafruit_7segment::print(const char c[]) { write(c, strlen(c)); }

void Adafruit_7segment::print(char c) { write(c); }

void Adafruit_7segment::print(unsigned long n, int base) {
if (base == 0)
write(n);
else
printNumber(n, base);
}

void Adafruit_7segment::print(char c, int base) { print((long)c, base); }

void Adafruit_7segment::print(unsigned char b, int base) {
print((unsigned long)b, base);
}
Expand All @@ -500,8 +585,18 @@ void Adafruit_7segment::print(unsigned int n, int base) {

void Adafruit_7segment::println(void) { position = 0; }

void Adafruit_7segment::println(char c, int base) {
print(c, base);
void Adafruit_7segment::println(const String &c) {
print(c);
println();
}

void Adafruit_7segment::println(const char c[]) {
print(c);
println();
}

void Adafruit_7segment::println(char c) {
print(c);
println();
}

Expand Down Expand Up @@ -537,7 +632,7 @@ void Adafruit_7segment::println(double n, int digits) {

void Adafruit_7segment::print(double n, int digits) { printFloat(n, digits); }

size_t Adafruit_7segment::write(uint8_t c) {
size_t Adafruit_7segment::write(char c) {

uint8_t r = 0;

Expand All @@ -546,8 +641,8 @@ size_t Adafruit_7segment::write(uint8_t c) {
if (c == '\r')
position = 0;

if ((c >= '0') && (c <= '9')) {
writeDigitNum(position, c - '0');
if ((c >= ' ') && (c <= 127)) {
writeDigitAscii(position, c);
r = 1;
}

Expand All @@ -558,6 +653,22 @@ size_t Adafruit_7segment::write(uint8_t c) {
return r;
}

size_t Adafruit_7segment::write(const char *buffer, size_t size) {
size_t n = 0;

while (n < size) {
write(buffer[n]);
n++;
}

// Clear unwritten positions
for (uint8_t i = position; i < 5; i++) {
writeDigitRaw(i, 0x00);
}

return n;
}

void Adafruit_7segment::writeDigitRaw(uint8_t d, uint8_t bitmask) {
if (d > 4)
return;
Expand All @@ -581,11 +692,44 @@ void Adafruit_7segment::writeColon(void) {
i2c_dev->write(buffer, 3);
}

void Adafruit_7segment::writeDigitNum(uint8_t d, uint8_t num, bool dot) {
void Adafruit_7segment::writeDigitNum(uint8_t d, uint8_t num, boolean dot) {
if (d > 4 || num > 15)
return;

if (num >= 10) { // Hex characters
switch (num) {
case 10:
writeDigitAscii(d, 'a', dot);
break;
case 11:
writeDigitAscii(d, 'B', dot);
break;
case 12:
writeDigitAscii(d, 'C', dot);
break;
case 13:
writeDigitAscii(d, 'd', dot);
break;
case 14:
writeDigitAscii(d, 'E', dot);
break;
case 15:
writeDigitAscii(d, 'F', dot);
break;
}
}

else
writeDigitAscii(d, num + 48, dot); // use ASCII offset
}

void Adafruit_7segment::writeDigitAscii(uint8_t d, uint8_t c, boolean dot) {
if (d > 4)
return;

writeDigitRaw(d, numbertable[num] | (dot << 7));
uint8_t font = pgm_read_byte(sevensegfonttable + c - 32);

writeDigitRaw(d, font | (dot << 7));
}

void Adafruit_7segment::print(long n, int base) { printNumber(n, base); }
Expand Down
54 changes: 46 additions & 8 deletions Adafruit_LEDBackpack.h
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Original file line number Diff line number Diff line change
Expand Up @@ -220,18 +220,25 @@ class Adafruit_7segment : public Adafruit_LEDBackpack {
Adafruit_7segment(void);

/*!
@brief Issue single digit to display.
@param c Digit to write (ASCII character, not numeric).
@return 1 if character written, else 0 (non-digit characters).
@brief Issue single character to display.
@param c Character to write (ASCII character, not numeric).
@return 1 if character written, else 0 (non-ASCII characters).
*/
size_t write(uint8_t c);
size_t write(char c);

/*!
@brief Write characters from buffer to display.
@param buffer Character array to write
@param size Number of characters to write
@return Number of characters written
*/
size_t write(const char *buffer, size_t size);

/*!
@brief Print byte-size numeric value to 7-segment display.
@param c Numeric value.
@param base Number base (default = RAW_BITS = raw bits)
*/
void print(char c, int base = RAW_BITS);
void print(char c);

/*!
@brief Print unsigned byte-size numeric value to 7-segment display.
Expand Down Expand Up @@ -275,12 +282,23 @@ class Adafruit_7segment : public Adafruit_LEDBackpack {
*/
void print(double n, int digits = 2);

/*!
@brief Print from a String object to 7-segment display.
@param c String object, passed by reference.
*/
void print(const String &c);

/*!
@brief Print from a C-style string array to 7-segment display.
@param c Array of characters.
*/
void print(const char c[]);

/*!
@brief Print byte-size numeric value w/newline to 7-segment display.
@param c Numeric value.
@param base Number base (default = RAW_BITS = raw bits)
*/
void println(char c, int base = RAW_BITS);
void println(char c);

/*!
@brief Print unsigned byte-size numeric value w/newline to 7-segment
Expand Down Expand Up @@ -325,6 +343,18 @@ class Adafruit_7segment : public Adafruit_LEDBackpack {
*/
void println(double n, int digits = 2);

/*!
@brief Print from a String object w/newline to 7-segment display.
@param c String object, passed by reference.
*/
void println(const String &c);

/*!
@brief Print from a C-style string array w/newline to 7-segment display.
@param c Array of characters.
*/
void println(const char c[]);

/*!
@brief Print newline to 7-segment display (rewind position to start).
*/
Expand All @@ -345,6 +375,14 @@ class Adafruit_7segment : public Adafruit_LEDBackpack {
*/
void writeDigitNum(uint8_t x, uint8_t num, bool dot = false);

/*!
@brief Set specific digit # to a character value.
@param x Character position.
@param c Character (ASCII).
@param dot If true, light corresponding decimal.
*/
void writeDigitAscii(uint8_t x, uint8_t c, bool dot = false);

/*!
@brief Set or unset colon segment.
@param state 'true' to enable colon, 'false' for off.
Expand Down
5 changes: 5 additions & 0 deletions examples/sevenseg/sevenseg.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,11 @@ void loop() {
matrix.print(12.34);
matrix.writeDisplay();
delay(500);

// print a string message
matrix.print("7SEG");
matrix.writeDisplay();
delay(10000);

// print with print/println
for (uint16_t counter = 0; counter < 9999; counter++) {
Expand Down

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