// Implemenatation of max7219.h
//
// www.while1.eu 30/07/2023

#include "max7219a.h"

// This array stores the 7 segment patterns to show all the ASCII characters in a
// 8 digits 7 segment display driven by a MAX7219.
// Sometimes uppercase letters have the same pattern of the lowercase.
// Segments and bit connections ==> MSB HABCDEFG LSB (see MAX7219 datasheet).
// Control characters return a zero (all LEDs off).

__code uChar getSegments[0x80] = {
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x00 Control characters return 0
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x08 Control characters return 0
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x10 Control characters return 0
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x18 Control characters return 0
		0x00, 0xB0, 0x22, 0x00, 0x00, 0x00, 0x00, 0x02,  // 0x20  !"#$%&' ok but # $ % & missing OK
		0x4E, 0x78, 0x00, 0x00, 0x80, 0x01, 0x80, 0x25,  // 0x28 ()*+,-./ ok but * +  	 missing OK
		0x7E, 0x30, 0x6D, 0x79, 0x33, 0x5B, 0x5F, 0x70,  // 0x30 01234567 ok OK
		0x7F, 0x7B, 0xA0, 0xA0, 0x0D, 0x09, 0x19, 0xE5,  // 0x38 89:;<=>? ok OK
		0x6F, 0x77, 0x1F, 0x4E, 0x3D, 0x4F, 0x47, 0x5E,  // 0x40 @ABCDEFG ok OK
		0x37, 0x30, 0x3C, 0xA7, 0x0E, 0x76, 0x15, 0x7E,  // 0x48 HIJKLMNO ok OK
		0x67, 0xFE, 0x05, 0x5B, 0x0F, 0x3E, 0x1C, 0x9C,  // 0x50 PQRSTUVW ok OK
		0x37, 0x3B, 0x6D, 0x4E, 0x13, 0x78, 0x62, 0x08,  // 0x58 XYZ[\]^_ ok OK
		0x20, 0x7D, 0x5F, 0x0D, 0x3D, 0x6F, 0x47, 0x7B,  // 0x60 `abcdefg ok OK
		0x17, 0x10, 0x18, 0xA7, 0x0C, 0x15, 0x15, 0x1D,  // 0x68 hijklmno ok OK
		0x67, 0x9D, 0x05, 0x5B, 0x0F, 0x1C, 0x1C, 0x9C,  // 0x70 pqrstuvw ok OK
		0x37, 0x3B, 0xED, 0x4E, 0x30, 0x78, 0x01, 0x00   // 0x78 xyz{|}~  ok OK last one is a DEL
		};


// Sends data or command to max7219
void writeWord(uChar command, uChar bdata){
	CS = 0;
	CLOCK = 0;
	uChar counter = 8;
	while(counter--){
		DATA = command & 0x80;
		CLOCK = 1;
		CLOCK = 0;
		command = command << 1;}
	counter = 8;
	while(counter--){
		DATA = bdata & 0x80;
		CLOCK = 1;
		CLOCK = 0;
		bdata = bdata << 1;}
	CS = 1;
	} //writeWord end

// Initialize max7219
void initMax7219(){
		writeWord(0x0C,0x00);	//Shutdown
		writeWord(0x09,0x00);	//No one decoded
		writeWord(0x0B,0x07);	//All digits addressable
		writeWord(0x0C,0x01);}	//Normal operation


// Clear each digit
void clearMax7219(){
	initMax7219();
	for (uChar a = 0; a < 9; a++)
		{writeWord(a,0);}
	}
// Set the level of LED brightness (Value from 0 to 15)
void setBrightnessMax7219(uChar brightness)	{
	writeWord(0xFA,brightness);}

// Kind of printf limited to 8 chars
void printString(char *c){
	for (char i = 8; i > 0; i--) {
		writeWord(i,getSegments[c[8-i]]);}
	return;}