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SC1628D.cpp
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SC1628D.cpp
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/*
* SC1628D.cpp
*
* Arduino Library for the SC1628D LED Driver IC
*
* (c) 2022/07/13 philippe.corbes@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
extern "C" {
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
}
#include <SC1628D.h>
#include <Arduino.h>
#define SC1628D_DISPLAY_MODE_CMD 0x00
#define SC1628D_DATA_SETTING_CMD_WRITE 0x40
#define SC1628D_DATA_SETTING_CMD_READ 0x42
#define SC1628D_DISPLAY_CONTROL_CMD 0x80
#define SC1628D_ADDRESS_SETTING_CMD 0xC0
/*
Keyboard pinout connected to the SC1628
K1 #... <---> 12 KS5 - 5 K1
K2 .#.. <---> 13 KS6 - 5 K1
K3 ..#. <---> 11 KS4 - 5 K1
K4 ...# <---> 10 KS3 - 5 K1
*/
/*
Display pinout connected to the SC1628
Anode 1 A <---> 20 GR7
2 B <---> 18 GR5
3 C <---> 23 GR4
4 D <---> 24 GR3
5 E <---> 26 GR2
6 F <---> 27 GR1
7 G <---> 19 GR6
Cathode 8 2 ..#. <---> 17 SG10
9 1 .#.. <---> 16 SG9
10 3 ...# <---> 15 SG8
11 0 #... <---> 9 SG2
12 4 Symbols <---> 10 SG3
*/
/*
Normal segment addressing:
[4F] [0A] [1A] [2A] [3A] [4A]
GR7/SG3 +-GR7/SG2-+ +-GR7/SG9-+ +-GR7/SG10+ +-GR7/SG8-+ GR5/SG3
| | | | | | | |
[0F] [0B] [1F] [1B] [2F] [2B] [3F] [3B]
GR1/SG2 GR5/SG2 GR1/SG9 GR5/SG9 GR1/SG10 GR5/SG10 GR1/SG8 GR5/SG8
[4E] | [0G] | | [1G] | [4G] | [2G] | | [3G] | [4B]
GR4/SG3 +-GR6/SG2-+ +-GR6/SG9-+ GR1/SG3 +-GR6/SG10+ +-GR6/SG8-+ GR5/SG3
| | | | | | | |
[0E] [0C] [1E] [1C] [2E] [2C] [3E] [3C]
GR2/SG2 GR4/SG2 GR2/SG9 GR4/SG9 GR2/SG10 GR4/SG10 GR2/SG8 GR4/SG8
[4D] | [0D] | | [1D] | | [2D] | | [3D] | [4C]
GR3/SG3 +-GR3/SG2-+ +-GR3/SG9-+ +-GR3/SG10+ +-GR3/SG8-+ GR2/SG3
*/
void SC1628D_NormalDisplay(uint8_t digit[], uint16_t matrix[])
{
uint16_t mask;
// Build GR1
mask = 0;
if (digit[0] & SEG_F) mask |= SG2;
if (digit[4] & SEG_G) mask |= SG3;
if (digit[3] & SEG_F) mask |= SG8;
if (digit[1] & SEG_F) mask |= SG9;
if (digit[2] & SEG_F) mask |= SG10;
matrix[0] = mask;
// Build GR2
mask = 0;
if (digit[0] & SEG_E) mask |= SG2;
if (digit[4] & SEG_C) mask |= SG3;
if (digit[3] & SEG_E) mask |= SG8;
if (digit[1] & SEG_E) mask |= SG9;
if (digit[2] & SEG_E) mask |= SG10;
matrix[1] = mask;
// Build GR3
mask = 0;
if (digit[0] & SEG_D) mask |= SG2;
if (digit[4] & SEG_D) mask |= SG3;
if (digit[3] & SEG_D) mask |= SG8;
if (digit[1] & SEG_D) mask |= SG9;
if (digit[2] & SEG_D) mask |= SG10;
matrix[2] = mask;
// Build GR4
mask = 0;
if (digit[0] & SEG_C) mask |= SG2;
if (digit[4] & SEG_E) mask |= SG3;
if (digit[3] & SEG_C) mask |= SG8;
if (digit[1] & SEG_C) mask |= SG9;
if (digit[2] & SEG_C) mask |= SG10;
matrix[3] = mask;
// Build GR5
mask = 0;
if (digit[0] & SEG_B) mask |= SG2;
if (digit[4] & SEG_A) mask |= SG3;
if (digit[3] & SEG_B) mask |= SG8;
if (digit[1] & SEG_B) mask |= SG9;
if (digit[2] & SEG_B) mask |= SG10;
matrix[4] = mask;
// Build GR6
mask = 0;
if (digit[0] & SEG_G) mask |= SG2;
if (digit[4] & SEG_B) mask |= SG3;
if (digit[3] & SEG_G) mask |= SG8;
if (digit[1] & SEG_G) mask |= SG9;
if (digit[2] & SEG_G) mask |= SG10;
matrix[5] = mask;
// Build GR7
mask = 0;
if (digit[0] & SEG_A) mask |= SG2;
if (digit[4] & SEG_F) mask |= SG3;
if (digit[3] & SEG_A) mask |= SG8;
if (digit[1] & SEG_A) mask |= SG9;
if (digit[2] & SEG_A) mask |= SG10;
matrix[6] = mask;
}
/*
Inverted segment addressing:
[4C] [3D] [2D] [1D] [0D] [4D]
GR7/SG3 +-GR7/SG2-+ +-GR7/SG9-+ +-GR7/SG10+ +-GR7/SG8-+ GR5/SG3
| | | | | | | |
[3C] [3E] [2C] [2E] [1C] [1E] [0C] [0E]
GR1/SG2 GR5/SG2 GR1/SG9 GR5/SG9 GR1/SG10 GR5/SG10 GR1/SG8 GR5/SG8
[4B] | [3G] | | [2G] | [4G] | [1G] | | [3G] | [4E]
GR4/SG3 +-GR6/SG2-+ +-GR6/SG9-+ GR1/SG3 +-GR6/SG10+ +-GR6/SG8-+ GR5/SG3
| | | | | | | |
[3B] [3F] [2B] [2F] [1B] [1F] [0B] [0F]
GR2/SG2 GR4/SG2 GR2/SG9 GR4/SG9 GR2/SG10 GR4/SG10 GR2/SG8 GR4/SG8
[4A] | [3A] | | [2A] | | [1A] | | [0A] | [4F]
GR3/SG3 +-GR3/SG2-+ +-GR3/SG9-+ +-GR3/SG10+ +-GR3/SG8-+ GR2/SG3
*/
void SC1628D_InvertedDisplay(uint8_t digit[], uint16_t matrix[])
{
uint16_t mask;
// Build GR1
mask = 0;
if (digit[3] & SEG_C) mask |= SG2;
if (digit[4] & SEG_G) mask |= SG3;
if (digit[0] & SEG_C) mask |= SG8;
if (digit[2] & SEG_C) mask |= SG9;
if (digit[1] & SEG_C) mask |= SG10;
matrix[0] = mask;
// Build GR2
mask = 0;
if (digit[3] & SEG_B) mask |= SG2;
if (digit[4] & SEG_F) mask |= SG3;
if (digit[0] & SEG_B) mask |= SG8;
if (digit[2] & SEG_B) mask |= SG9;
if (digit[1] & SEG_B) mask |= SG10;
matrix[1] = mask;
// Build GR3
mask = 0;
if (digit[3] & SEG_A) mask |= SG2;
if (digit[4] & SEG_A) mask |= SG3;
if (digit[0] & SEG_A) mask |= SG8;
if (digit[2] & SEG_A) mask |= SG9;
if (digit[1] & SEG_A) mask |= SG10;
matrix[2] = mask;
// Build GR4
mask = 0;
if (digit[3] & SEG_F) mask |= SG2;
if (digit[4] & SEG_B) mask |= SG3;
if (digit[0] & SEG_F) mask |= SG8;
if (digit[2] & SEG_F) mask |= SG9;
if (digit[1] & SEG_F) mask |= SG10;
matrix[3] = mask;
// Build GR5
mask = 0;
if (digit[3] & SEG_E) mask |= SG2;
if (digit[4] & SEG_D) mask |= SG3;
if (digit[0] & SEG_E) mask |= SG8;
if (digit[2] & SEG_E) mask |= SG9;
if (digit[1] & SEG_E) mask |= SG10;
matrix[4] = mask;
// Build GR6
mask = 0;
if (digit[3] & SEG_G) mask |= SG2;
if (digit[4] & SEG_E) mask |= SG3;
if (digit[0] & SEG_G) mask |= SG8;
if (digit[2] & SEG_G) mask |= SG9;
if (digit[1] & SEG_G) mask |= SG10;
matrix[5] = mask;
// Build GR7
mask = 0;
if (digit[3] & SEG_D) mask |= SG2;
if (digit[4] & SEG_C) mask |= SG3;
if (digit[0] & SEG_D) mask |= SG8;
if (digit[2] & SEG_D) mask |= SG9;
if (digit[1] & SEG_D) mask |= SG10;
matrix[6] = mask;
}
// Segment names
// <-A->
// ^ ^
// F B
// v v
// <-G->
// ^ ^
// E C
// v v
// <-D->
const uint8_t SC1628D_NORMAL_FONT[] = {
/* 0 */ SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F,
/* 1 */ SEG_B | SEG_C,
/* 2 */ SEG_A | SEG_B | SEG_G | SEG_E | SEG_D,
/* 3 */ SEG_A | SEG_B | SEG_C | SEG_D | SEG_G,
/* 4 */ SEG_F | SEG_G | SEG_B | SEG_C,
/* 5 */ SEG_A | SEG_F | SEG_G | SEG_C | SEG_D,
/* 6 */ SEG_A | SEG_F | SEG_E | SEG_D | SEG_C | SEG_G,
/* 7 *//*SEG_F |*/ SEG_A | SEG_B | SEG_C,
/* 8 */ SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,
/* 9 */ SEG_G | SEG_F | SEG_A | SEG_B | SEG_C | SEG_D,
/* A */ SEG_E | SEG_F | SEG_A | SEG_B | SEG_C | SEG_G,
/* b */ SEG_F | SEG_E | SEG_D | SEG_C | SEG_G,
/* c */ SEG_G | SEG_E | SEG_D,
/* d */ SEG_G | SEG_E | SEG_D | SEG_C | SEG_B,
/* E */ SEG_A | SEG_F | SEG_E | SEG_D | SEG_G,
/* F */ SEG_A | SEG_F | SEG_E | SEG_G,
/* */ 0, // DIGIT_BLANK
/* - */ SEG_G, // DIGIT_MINUS
/* ° */ SEG_A | SEG_B | SEG_G | SEG_F, // DIGIT_DEGRE
/* C */ SEG_A | SEG_F | SEG_E | SEG_D, // DIGIT_C
/* ? */ SEG_A | SEG_B | SEG_G | SEG_E, // DIGIT_QUESTION
};
const uint8_t SC1628D_INVERTED_FONT[] = {
/* 0 */ SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F,
/* 1 */ SEG_E | SEG_F,
/* 2 */ SEG_A | SEG_B | SEG_G | SEG_E | SEG_D,
/* 3 */ SEG_A | SEG_F | SEG_E | SEG_D | SEG_G,
/* 4 */ SEG_C | SEG_G | SEG_F | SEG_E,
/* 5 */ SEG_A | SEG_F | SEG_G | SEG_C | SEG_D,
/* 6 */ SEG_D | SEG_E | SEG_F | SEG_A | SEG_B | SEG_G,
/* 7 */ SEG_D | SEG_E | SEG_F,
/* 8 */ SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,
/* 9 */ SEG_G | SEG_C | SEG_D | SEG_E | SEG_F | SEG_A,
/* A */ SEG_B | SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,
/* b */ SEG_C | SEG_B | SEG_A | SEG_F | SEG_G,
/* c */ SEG_G | SEG_B | SEG_A,
/* d */ SEG_G | SEG_B | SEG_A | SEG_F | SEG_D,
/* E */ SEG_D | SEG_C | SEG_B | SEG_A | SEG_G,
/* F */ SEG_D | SEG_D | SEG_B | SEG_G,
/* */ 0, // DIGIT_BLANK
/* - */ SEG_G, // DIGIT_MINUS
/* ° */ SEG_D | SEG_C | SEG_G | SEG_E, // DIGIT_DEGRE
/* C */ SEG_D | SEG_C | SEG_B | SEG_A, // DIGIT_C
/* ? */ SEG_D | SEG_E | SEG_G | SEG_B, // DIGIT_QUESTION
};
//-----------------------------------------------------------------
SC1628D::SC1628D(uint8_t pinSTB, uint8_t pinCLK, uint8_t pinDIO, unsigned int bitDelay)
{
m_font = SC1628D_NORMAL_FONT;
m_filter = &SC1628D_NormalDisplay;
// Copy the pin numbers
m_pinSTB = pinSTB;
m_pinCLK = pinCLK;
m_pinDIO = pinDIO;
m_bitDelay = bitDelay;
// Set the pin direction and default value.
// Both pins are set as inputs, allowing the pull-up resistors to pull them up
pinMode(m_pinSTB, OUTPUT);
pinMode(m_pinCLK, OUTPUT);
pinMode(m_pinDIO, OUTPUT);
digitalWrite(m_pinSTB, HIGH);
digitalWrite(m_pinCLK, HIGH);
digitalWrite(m_pinDIO, HIGH);
}
void SC1628D::clear()
{
uint8_t data[] = { 0, 0, 0, 0, 0};
displayDigits(data);
}
void SC1628D::setBrightness(uint8_t brightness, bool on)
{
m_brightness = (brightness & 0x7) | (on? 0x08 : 0x00);
}
void SC1628D::setFont(uint8_t font[])
{
m_font = font;
}
void SC1628D::setFilter(void (*aFilterFunction)(uint8_t digit[], uint16_t matrix[]))
{
m_filter = aFilterFunction;
}
void SC1628D::displayDigit(const uint8_t digit, uint8_t pos)
{
m_segments[pos] = m_font[digit];
displaySegments(m_segments);
}
void SC1628D::displayDigits(const uint8_t digits[], uint8_t pos, uint8_t length)
{
for (uint8_t i = 0; i < length; i++) {
m_segments[pos++] = m_font[digits[i]];
}
displaySegments(m_segments);
}
void SC1628D::displaySegment(const uint8_t segment, uint8_t pos)
{
m_segments[pos] = segment;
displaySegments(m_segments);
}
void SC1628D::displaySegments(const uint8_t segments[], uint8_t pos, uint8_t length)
{
uint16_t matrix[7];
if (segments != m_segments)
for (uint8_t i = 0; i < length; i++)
m_segments[pos++] = segments[i];
m_filter(m_segments, matrix);
writeMatrix(matrix);
// Command 1: Set display mode (default: 7 grids - 11 segments)
start();
writeCommand(SC1628D_DISPLAY_MODE_CMD + SC1628D_7GRID_11SEG);
stop();
// Command 4: Set Display on/off + Brightness
start();
writeCommand(SC1628D_DISPLAY_CONTROL_CMD + (m_brightness & 0x0f));
stop();
}
uint32_t SC1628D::getButtons(void)
{
// Keyscan data on the SC1628 is 2x10 keys, received as an array of 5 bytes (same as TM1668).
// Of each byte the bits B0/B3 and B1/B4 represent status of the connection of K1 and K2 to KS1-KS10
// Byte1[0-1]: KS1xK1, KS1xK2
// The return value is a 32 bit value containing button scans for both K1 and K2, the high word is for K2 and the low word for K1.
uint8_t keys;
uint32_t buttons = 0;
start();
writeCommand(SC1628D_DATA_SETTING_CMD_READ); // send read buttons command
for (int i = 0; i < 5; i++) {
keys = receiveData();
buttons |= (( (keys & 0x01) | ((keys & 0x08) >> 2)) << (2*i)); // bit 0 for K1/KS1 and bit 3 for K1/KS2
buttons |= ((((keys & 0x02) >> 1) | ((keys & 0x10) >> 3)) << (2*i + 16)); // bit 1 for K2/KS1 and bit 4 for K2/KS2
}
stop();
return buttons;
}
//-----------------------------------------------------------------
void SC1628D::bitDelay()
{
delayMicroseconds(m_bitDelay);
}
void SC1628D::start()
{
digitalWrite(m_pinSTB, LOW);
bitDelay();
}
void SC1628D::stop()
{
digitalWrite(m_pinSTB, HIGH);
bitDelay();
}
void SC1628D::writeCommand(uint8_t b)
{
uint8_t data = b;
// 8 Data Bits
for(uint8_t i = 0; i < 8; i++)
{
// CLK low
digitalWrite(m_pinCLK, LOW);
// Set data bit
if (data & 0x01)
digitalWrite(m_pinDIO, HIGH);
else
digitalWrite(m_pinDIO, LOW);
bitDelay();
// CLK high
digitalWrite(m_pinCLK, HIGH);
bitDelay();
data = data >> 1;
}
bitDelay();
}
void SC1628D::writeData(uint16_t b)
{
uint16_t data = b;
// 8 Data Bits
for(uint8_t i = 0; i < 16; i++)
{
// CLK low
digitalWrite(m_pinCLK, LOW);
// Set data bit
if (data & 0x01)
digitalWrite(m_pinDIO, HIGH);
else
digitalWrite(m_pinDIO, LOW);
bitDelay();
// CLK high
digitalWrite(m_pinCLK, HIGH);
bitDelay();
data = data >> 1;
}
bitDelay();
}
void SC1628D::writeMatrix(const uint16_t matrix[])
{
// Command 2: Set Write data to display, in incremental mode
start();
writeCommand(SC1628D_DATA_SETTING_CMD_WRITE);
stop();
// Command 3: Set write address + digits data
start();
writeCommand(SC1628D_ADDRESS_SETTING_CMD);
// Write the data bytes
for (uint8_t k = 0; k < 7; k++)
{
writeData(matrix[k]);
}
stop();
}
uint8_t SC1628D::receiveData()
{
uint8_t temp = 0;
// Pull-up on
// pinMode(m_pinDIO, INPUT);
// digitalWrite(m_pinDIO, HIGH);
pinMode(m_pinDIO, INPUT_PULLUP);
for (int i = 0; i < 8; i++) {
temp >>= 1;
// CLK low
digitalWrite(m_pinCLK, LOW);
bitDelay();
if (digitalRead(m_pinDIO)) {
temp |= 0x80;
}
// CLK high
digitalWrite(m_pinCLK, HIGH);
bitDelay();
}
// Pull-up off
pinMode(m_pinDIO, OUTPUT);
// digitalWrite(m_pinDIO, LOW);
return temp;
}