Grzegorz Kaczmarek / Mbed 2 deprecated Max7221

Fix to have load pin working with SPI1.

Dependencies:   mbed

Fork of Max7221 by Dwayne Dilbeck

MAX7221/Max7221.cpp@1:d8589d1f368c, 2013-08-06 (annotated)

Committer:
jakowisp
Date:
Tue Aug 06 08:18:53 2013 +0000
Revision:
1:d8589d1f368c
Child:
2:828c62cc1861
Library mostly complete. Need to clean up code and document.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jakowisp 1:d8589d1f368c 1 #include "mbed.h"
jakowisp 1:d8589d1f368c 2 #include "Max7221.h"
jakowisp 1:d8589d1f368c 3
jakowisp 1:d8589d1f368c 4 int Max7221::maxInUseSPI1 = 0;
jakowisp 1:d8589d1f368c 5 int Max7221::maxInUseSPI2 = 0;
jakowisp 1:d8589d1f368c 6 SPI *Max7221::spi1=NULL;
jakowisp 1:d8589d1f368c 7 SPI *Max7221::spi2=NULL;
jakowisp 1:d8589d1f368c 8 DigitalOut *Max7221::load1=NULL;
jakowisp 1:d8589d1f368c 9 DigitalOut *Max7221::load2=NULL;
jakowisp 1:d8589d1f368c 10
jakowisp 1:d8589d1f368c 11 Max7221::Max7221(PinName msoi, PinName mclk, PinName load){
jakowisp 1:d8589d1f368c 12 switch (msoi) {
jakowisp 1:d8589d1f368c 13 case p5: maxInUseSPI1++;
jakowisp 1:d8589d1f368c 14 this->id=maxInUseSPI1;
jakowisp 1:d8589d1f368c 15 this->maxInUse=&maxInUseSPI1;
jakowisp 1:d8589d1f368c 16 if (spi1 ==NULL) {
jakowisp 1:d8589d1f368c 17 spi1 = new SPI(msoi, NC, mclk);
jakowisp 1:d8589d1f368c 18 load1 = new DigitalOut(load);
jakowisp 1:d8589d1f368c 19 } else {
jakowisp 1:d8589d1f368c 20 //TODO: Check that load pin is the same for all SP2
jakowisp 1:d8589d1f368c 21 }
jakowisp 1:d8589d1f368c 22 this->max72_spi=spi1;
jakowisp 1:d8589d1f368c 23 this->load = load2;
jakowisp 1:d8589d1f368c 24 break;
jakowisp 1:d8589d1f368c 25 case p11: maxInUseSPI2++;
jakowisp 1:d8589d1f368c 26 this->id=maxInUseSPI2;
jakowisp 1:d8589d1f368c 27 this->maxInUse=&maxInUseSPI2;
jakowisp 1:d8589d1f368c 28 if (spi2 ==NULL) {
jakowisp 1:d8589d1f368c 29 spi2 = new SPI(msoi, NC, mclk);
jakowisp 1:d8589d1f368c 30 load2 = new DigitalOut(load);
jakowisp 1:d8589d1f368c 31 } else {
jakowisp 1:d8589d1f368c 32 //TODO: Check that load pin is the same for all SP2
jakowisp 1:d8589d1f368c 33 }
jakowisp 1:d8589d1f368c 34 this->max72_spi=spi2;
jakowisp 1:d8589d1f368c 35 this->load = load2;
jakowisp 1:d8589d1f368c 36 break;
jakowisp 1:d8589d1f368c 37 default: error("Not a SPI port");
jakowisp 1:d8589d1f368c 38 }
jakowisp 1:d8589d1f368c 39
jakowisp 1:d8589d1f368c 40 }
jakowisp 1:d8589d1f368c 41
jakowisp 1:d8589d1f368c 42 void Max7221::Write( unsigned int reg, unsigned int col) {
jakowisp 1:d8589d1f368c 43 //maxOne is for adressing different MAX7219's,
jakowisp 1:d8589d1f368c 44 //while having a couple of them cascaded
jakowisp 1:d8589d1f368c 45 int c = 0;
jakowisp 1:d8589d1f368c 46 *load = LOW;
jakowisp 1:d8589d1f368c 47
jakowisp 1:d8589d1f368c 48 for ( c = *maxInUse; c > this->id; c--) {
jakowisp 1:d8589d1f368c 49 max72_spi->write(0); // no-op
jakowisp 1:d8589d1f368c 50 max72_spi->write(0); // no-op
jakowisp 1:d8589d1f368c 51 }
jakowisp 1:d8589d1f368c 52
jakowisp 1:d8589d1f368c 53 max72_spi->write(reg); // specify register
jakowisp 1:d8589d1f368c 54 max72_spi->write(col); // put data
jakowisp 1:d8589d1f368c 55
jakowisp 1:d8589d1f368c 56 for ( c=this->id-1; c >= 1; c--) {
jakowisp 1:d8589d1f368c 57 max72_spi->write(0); // no-op
jakowisp 1:d8589d1f368c 58 max72_spi->write(0); // no-op
jakowisp 1:d8589d1f368c 59 }
jakowisp 1:d8589d1f368c 60 *load = HIGH;
jakowisp 1:d8589d1f368c 61 }
jakowisp 1:d8589d1f368c 62
jakowisp 1:d8589d1f368c 63 void Max7221::Setup () {
jakowisp 1:d8589d1f368c 64 // initiation of the max 7219
jakowisp 1:d8589d1f368c 65 // SPI setup: 8 bits, mode 0
jakowisp 1:d8589d1f368c 66 max72_spi->format(8, 0);
jakowisp 1:d8589d1f368c 67
jakowisp 1:d8589d1f368c 68 // going by the datasheet, min clk is 100ns so theoretically 10MHz should work...
jakowisp 1:d8589d1f368c 69 max72_spi->frequency(10*MHZ);
jakowisp 1:d8589d1f368c 70
jakowisp 1:d8589d1f368c 71 Write(max7219_reg_scanLimit, 0x07);
jakowisp 1:d8589d1f368c 72 Write(max7219_reg_decodeMode, 0xff); // using an led matrix (not digits)
jakowisp 1:d8589d1f368c 73 Write(max7219_reg_shutdown, 0x01); // not in shutdown mode
jakowisp 1:d8589d1f368c 74 Write(max7219_reg_displayTest, 0x00); // no display test
jakowisp 1:d8589d1f368c 75 for (int e=1; e<=8; e++) { // empty registers, turn all LEDs off
jakowisp 1:d8589d1f368c 76 Write(e,0xf);
jakowisp 1:d8589d1f368c 77 }
jakowisp 1:d8589d1f368c 78 Write(max7219_reg_intensity, 0x01 & 0x0f); // the first 0x0f is the value you can set
jakowisp 1:d8589d1f368c 79 // range: 0x00 to 0x0f
jakowisp 1:d8589d1f368c 80 }
jakowisp 1:d8589d1f368c 81
jakowisp 1:d8589d1f368c 82
jakowisp 1:d8589d1f368c 83 void Max7221::WriteAll (unsigned int reg, unsigned int col) { // initialize all MAX7219's in the system
jakowisp 1:d8589d1f368c 84 if(load1 !=NULL) {
jakowisp 1:d8589d1f368c 85 *load1 = LOW; // begin
jakowisp 1:d8589d1f368c 86 for ( int c=1; c<= maxInUseSPI1; c++) {
jakowisp 1:d8589d1f368c 87 spi1->write(reg); // specify register
jakowisp 1:d8589d1f368c 88 spi1->write(col); // put data
jakowisp 1:d8589d1f368c 89 }
jakowisp 1:d8589d1f368c 90 *load1 = HIGH;
jakowisp 1:d8589d1f368c 91 }
jakowisp 1:d8589d1f368c 92 if(load2 !=NULL) {
jakowisp 1:d8589d1f368c 93 *load2 = LOW;
jakowisp 1:d8589d1f368c 94 for ( int c=1; c<= maxInUseSPI2; c++) {
jakowisp 1:d8589d1f368c 95 spi2->write(reg); // specify register
jakowisp 1:d8589d1f368c 96 spi2->write(col); // put data
jakowisp 1:d8589d1f368c 97 }
jakowisp 1:d8589d1f368c 98 *load2 = HIGH;
jakowisp 1:d8589d1f368c 99 }
jakowisp 1:d8589d1f368c 100 }
jakowisp 1:d8589d1f368c 101
jakowisp 1:d8589d1f368c 102 void Max7221::WriteInt( int value ){
jakowisp 1:d8589d1f368c 103 char buffer[16];
jakowisp 1:d8589d1f368c 104
jakowisp 1:d8589d1f368c 105 //TODO:SET UPPERBOUND AND LOWERBOUND based on NUMDIGITS
jakowisp 1:d8589d1f368c 106 if (value <= UPPERBOUND && value >= LOWERBOUND) {
jakowisp 1:d8589d1f368c 107 sprintf(buffer,"%8d",value);
jakowisp 1:d8589d1f368c 108 } else {
jakowisp 1:d8589d1f368c 109 sprintf(buffer,"--------");
jakowisp 1:d8589d1f368c 110 }
jakowisp 1:d8589d1f368c 111
jakowisp 1:d8589d1f368c 112 Write(max7219_reg_decodeMode, 0xff);
jakowisp 1:d8589d1f368c 113 for (int i=0;i<NUMDIGITS;i++) {
jakowisp 1:d8589d1f368c 114 switch(buffer[i]){
jakowisp 1:d8589d1f368c 115 case 0x2d: buffer[i]=0xa; break;
jakowisp 1:d8589d1f368c 116 case 0x20: buffer[i]=0xf; break;
jakowisp 1:d8589d1f368c 117 default: buffer[i]= buffer[i] & 0x0f;
jakowisp 1:d8589d1f368c 118 }
jakowisp 1:d8589d1f368c 119 Write(NUMDIGITS-i,buffer[i]);
jakowisp 1:d8589d1f368c 120 }
jakowisp 1:d8589d1f368c 121 }
jakowisp 1:d8589d1f368c 122
jakowisp 1:d8589d1f368c 123 void Max7221::WriteFloat( float value ){
jakowisp 1:d8589d1f368c 124 char buffer[32];
jakowisp 1:d8589d1f368c 125 int ptr=-1,len;
jakowisp 1:d8589d1f368c 126 int i;
jakowisp 1:d8589d1f368c 127
jakowisp 1:d8589d1f368c 128 sprintf(buffer,"%f",value);
jakowisp 1:d8589d1f368c 129 len=strlen(buffer);
jakowisp 1:d8589d1f368c 130 i=len-1;
jakowisp 1:d8589d1f368c 131 while(buffer[i]==0x30) {
jakowisp 1:d8589d1f368c 132 buffer[i]='\0';
jakowisp 1:d8589d1f368c 133 i--;
jakowisp 1:d8589d1f368c 134 len--;
jakowisp 1:d8589d1f368c 135 }
jakowisp 1:d8589d1f368c 136 for( i =0; i<=len; i++) {
jakowisp 1:d8589d1f368c 137 switch(buffer[i]){
jakowisp 1:d8589d1f368c 138 case 0x2d: buffer[i]=0xa; break;
jakowisp 1:d8589d1f368c 139 case 0x20: buffer[i]=0xf; break;
jakowisp 1:d8589d1f368c 140 case 0x2e: buffer[i]=buffer[i-1] | 0x80;
jakowisp 1:d8589d1f368c 141 ptr = i-1;
jakowisp 1:d8589d1f368c 142 break;
jakowisp 1:d8589d1f368c 143 default: buffer[i]= buffer[i];
jakowisp 1:d8589d1f368c 144 }
jakowisp 1:d8589d1f368c 145 if (ptr != -1) {
jakowisp 1:d8589d1f368c 146 buffer[i-1]=buffer[i];
jakowisp 1:d8589d1f368c 147 }
jakowisp 1:d8589d1f368c 148 }
jakowisp 1:d8589d1f368c 149
jakowisp 1:d8589d1f368c 150 len=strlen(buffer);
jakowisp 1:d8589d1f368c 151 Write(max7219_reg_decodeMode, 0xff);
jakowisp 1:d8589d1f368c 152
jakowisp 1:d8589d1f368c 153 // If too large for display set to '-'
jakowisp 1:d8589d1f368c 154 if(len > NUMDIGITS && (ptr==-1 || ptr>NUMDIGITS))
jakowisp 1:d8589d1f368c 155 for (int i=0;i<NUMDIGITS;i++) {
jakowisp 1:d8589d1f368c 156 buffer[i]=0x0a;
jakowisp 1:d8589d1f368c 157 }
jakowisp 1:d8589d1f368c 158 //if number is smaller than display, fill with ' '
jakowisp 1:d8589d1f368c 159 if (len<=NUMDIGITS) {
jakowisp 1:d8589d1f368c 160 for (int i=1;i<=NUMDIGITS;i++) {
jakowisp 1:d8589d1f368c 161 if(len-i>=0) {
jakowisp 1:d8589d1f368c 162 Write(i,buffer[len-i]);
jakowisp 1:d8589d1f368c 163 } else {
jakowisp 1:d8589d1f368c 164 Write(i,0xf);
jakowisp 1:d8589d1f368c 165 }
jakowisp 1:d8589d1f368c 166 }
jakowisp 1:d8589d1f368c 167 } else {
jakowisp 1:d8589d1f368c 168 //Write out the buffer, truncating the decimal digits if larger than display
jakowisp 1:d8589d1f368c 169 for (int i=0;i<NUMDIGITS;i++) {
jakowisp 1:d8589d1f368c 170 Write(NUMDIGITS-i,buffer[i]);
jakowisp 1:d8589d1f368c 171 }
jakowisp 1:d8589d1f368c 172 }
jakowisp 1:d8589d1f368c 173 }
jakowisp 1:d8589d1f368c 174
jakowisp 1:d8589d1f368c 175 void Max7221::SetupAll () {
jakowisp 1:d8589d1f368c 176 // initiation of the max 7219
jakowisp 1:d8589d1f368c 177 // SPI setup: 8 bits, mode 0
jakowisp 1:d8589d1f368c 178 if(spi1!=NULL) {
jakowisp 1:d8589d1f368c 179 spi1->format(8, 0);
jakowisp 1:d8589d1f368c 180 spi1->frequency(10*MHZ);
jakowisp 1:d8589d1f368c 181 }
jakowisp 1:d8589d1f368c 182 if(spi2!=NULL) {
jakowisp 1:d8589d1f368c 183 spi2->format(8, 0);
jakowisp 1:d8589d1f368c 184 spi2->frequency(10*MHZ);
jakowisp 1:d8589d1f368c 185 }
jakowisp 1:d8589d1f368c 186 WriteAll(max7219_reg_scanLimit, 0x07);
jakowisp 1:d8589d1f368c 187 WriteAll(max7219_reg_decodeMode, 0xff); // using an led matrix (not digits)
jakowisp 1:d8589d1f368c 188 WriteAll(max7219_reg_shutdown, 0x01); // not in shutdown mode
jakowisp 1:d8589d1f368c 189 WriteAll(max7219_reg_displayTest, 0x00); // no display test
jakowisp 1:d8589d1f368c 190 for (int e=1; e<=8; e++) { // empty registers, turn all LEDs off
jakowisp 1:d8589d1f368c 191 WriteAll(e,0xf);
jakowisp 1:d8589d1f368c 192 }
jakowisp 1:d8589d1f368c 193 WriteAll(max7219_reg_intensity, 0x01 & 0x0f); // the first 0x0f is the value you can set
jakowisp 1:d8589d1f368c 194 // range: 0x00 to 0x0f
jakowisp 1:d8589d1f368c 195 }