Grzegorz Kaczmarek / Mbed 2 deprecated Max7221

Fix to have load pin working with SPI1.

Dependencies:   mbed

Fork of Max7221 by Dwayne Dilbeck

Max7221.cpp@9:75bddbfbb692, 2015-11-24 (annotated)

Committer:
ky3orr
Date:
Tue Nov 24 00:38:36 2015 +0000
Revision:
9:75bddbfbb692
Parent:
8:3f5901f2f813 
All instances now share one SPI and /CS signal and operate in display chain.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jakowisp 2:828c62cc1861 1 /**
jakowisp 2:828c62cc1861 2 * @file Max7221.cpp
ky3orr 7:a160cb7cdd86 3 * @brief MAX7219/7221 driver class.
jakowisp 2:828c62cc1861 4 *
ky3orr 7:a160cb7cdd86 5 * @author Grzegorz Kaczmarek
ky3orr 8:3f5901f2f813 6 * @comment Code inspired on earlier Dwayne S. Dilbeck's work
ky3orr 7:a160cb7cdd86 7 * @date 20/11/2015
jakowisp 2:828c62cc1861 8 */
ky3orr 7:a160cb7cdd86 9
jakowisp 1:d8589d1f368c 10 #include "mbed.h"
jakowisp 1:d8589d1f368c 11 #include "Max7221.h"
jakowisp 1:d8589d1f368c 12
ky3orr 9:75bddbfbb692 13 // Static members initialization
ky3orr 9:75bddbfbb692 14 SPI *Max7221::mp_spi = NULL;
ky3orr 9:75bddbfbb692 15 DigitalOut *Max7221::mp_cs = NULL;
ky3orr 9:75bddbfbb692 16 unsigned int Max7221::m_counter = 0;
ky3orr 9:75bddbfbb692 17
ky3orr 9:75bddbfbb692 18 Max7221::Max7221() {
ky3orr 9:75bddbfbb692 19 m_position = m_counter;
ky3orr 9:75bddbfbb692 20 m_counter++;
jakowisp 1:d8589d1f368c 21 }
jakowisp 1:d8589d1f368c 22
ky3orr 9:75bddbfbb692 23 Max7221::Max7221(SPI *spi, DigitalOut *cs) {
ky3orr 9:75bddbfbb692 24 mp_spi = spi;
ky3orr 9:75bddbfbb692 25 mp_cs = cs;
ky3orr 9:75bddbfbb692 26 m_position = m_counter;
ky3orr 9:75bddbfbb692 27 m_counter++;
ky3orr 9:75bddbfbb692 28 }
ky3orr 9:75bddbfbb692 29
ky3orr 9:75bddbfbb692 30 void Max7221::SetSpi(SPI *spi) {
ky3orr 9:75bddbfbb692 31 mp_spi = spi;
ky3orr 9:75bddbfbb692 32 }
ky3orr 9:75bddbfbb692 33
ky3orr 9:75bddbfbb692 34 void Max7221::SetCs(DigitalOut *cs) {
ky3orr 9:75bddbfbb692 35 mp_cs = cs;
ky3orr 9:75bddbfbb692 36 }
ky3orr 9:75bddbfbb692 37
ky3orr 9:75bddbfbb692 38
ky3orr 7:a160cb7cdd86 39 void Max7221::CsLow()
ky3orr 7:a160cb7cdd86 40 {
ky3orr 7:a160cb7cdd86 41 if(mp_cs != NULL) {
ky3orr 7:a160cb7cdd86 42 *mp_cs = LOG_0;
jakowisp 1:d8589d1f368c 43 }
jakowisp 1:d8589d1f368c 44 }
jakowisp 1:d8589d1f368c 45
ky3orr 7:a160cb7cdd86 46 void Max7221::CsHigh()
ky3orr 7:a160cb7cdd86 47 {
ky3orr 7:a160cb7cdd86 48 if(mp_cs != NULL) {
ky3orr 7:a160cb7cdd86 49 *mp_cs = LOG_1;
jakowisp 1:d8589d1f368c 50 }
jakowisp 1:d8589d1f368c 51 }
jakowisp 1:d8589d1f368c 52
ky3orr 7:a160cb7cdd86 53 void Max7221::WriteRaw(unsigned int reg, unsigned int data) {
ky3orr 7:a160cb7cdd86 54 if(mp_spi != NULL) {
ky3orr 7:a160cb7cdd86 55 mp_spi->write(reg);
ky3orr 7:a160cb7cdd86 56 mp_spi->write(data);
jakowisp 1:d8589d1f368c 57 }
jakowisp 1:d8589d1f368c 58 }
ky3orr 7:a160cb7cdd86 59
ky3orr 7:a160cb7cdd86 60 void Max7221::Write(unsigned int reg, unsigned int data) {
ky3orr 7:a160cb7cdd86 61 unsigned int i;
ky3orr 7:a160cb7cdd86 62
ky3orr 7:a160cb7cdd86 63 CsLow();
ky3orr 9:75bddbfbb692 64 if((m_counter > 1) && ((m_counter - 1) > m_position)) {
ky3orr 9:75bddbfbb692 65 i = m_counter - 1 - m_position;
ky3orr 9:75bddbfbb692 66 while(i--) {
ky3orr 9:75bddbfbb692 67 WriteRaw(max7221_reg_noop, 0x00);
ky3orr 9:75bddbfbb692 68 }
ky3orr 9:75bddbfbb692 69 }
ky3orr 7:a160cb7cdd86 70 WriteRaw(reg, data);
ky3orr 7:a160cb7cdd86 71 if(m_position > 0) {
ky3orr 7:a160cb7cdd86 72 i = m_position;
ky3orr 7:a160cb7cdd86 73 while(i--) {
ky3orr 9:75bddbfbb692 74 WriteRaw(max7221_reg_noop, 0x00);
ky3orr 7:a160cb7cdd86 75 }
ky3orr 7:a160cb7cdd86 76 }
ky3orr 7:a160cb7cdd86 77 CsHigh();
ky3orr 7:a160cb7cdd86 78 }
ky3orr 7:a160cb7cdd86 79
ky3orr 7:a160cb7cdd86 80 void Max7221::TestMode(bool mode) {
ky3orr 7:a160cb7cdd86 81 if(mode) {
ky3orr 9:75bddbfbb692 82 Write(max7221_reg_displayTest, 0x01);
ky3orr 7:a160cb7cdd86 83 } else {
ky3orr 9:75bddbfbb692 84 Write(max7221_reg_displayTest, 0x00);
ky3orr 7:a160cb7cdd86 85 }
ky3orr 7:a160cb7cdd86 86 }
ky3orr 7:a160cb7cdd86 87
ky3orr 7:a160cb7cdd86 88 void Max7221::UseDigitsNo(unsigned int digits_no) {
ky3orr 7:a160cb7cdd86 89 if((digits_no > 0) && (digits_no < 9)) {
ky3orr 9:75bddbfbb692 90 Write(max7221_reg_scanLimit, (digits_no - 1));
ky3orr 7:a160cb7cdd86 91 }
ky3orr 7:a160cb7cdd86 92 }
ky3orr 7:a160cb7cdd86 93
ky3orr 7:a160cb7cdd86 94 void Max7221::DecodeMode(unsigned int mode) {
ky3orr 9:75bddbfbb692 95 Write(max7221_reg_decodeMode, mode);
jakowisp 1:d8589d1f368c 96 }
jakowisp 1:d8589d1f368c 97
ky3orr 7:a160cb7cdd86 98 void Max7221::WriteDigit(unsigned int digit_no, unsigned int value) {
ky3orr 9:75bddbfbb692 99 unsigned int digit_reg;
ky3orr 9:75bddbfbb692 100
ky3orr 7:a160cb7cdd86 101 if(digit_no < 8) {
ky3orr 9:75bddbfbb692 102 switch(digit_no) {
ky3orr 9:75bddbfbb692 103 case 0:
ky3orr 9:75bddbfbb692 104 digit_reg = max7221_reg_digit0;
ky3orr 9:75bddbfbb692 105 break;
ky3orr 9:75bddbfbb692 106 case 1:
ky3orr 9:75bddbfbb692 107 digit_reg = max7221_reg_digit1;
ky3orr 9:75bddbfbb692 108 break;
ky3orr 9:75bddbfbb692 109 case 2:
ky3orr 9:75bddbfbb692 110 digit_reg = max7221_reg_digit2;
ky3orr 9:75bddbfbb692 111 break;
ky3orr 9:75bddbfbb692 112 case 3:
ky3orr 9:75bddbfbb692 113 digit_reg = max7221_reg_digit3;
ky3orr 9:75bddbfbb692 114 break;
ky3orr 9:75bddbfbb692 115 case 4:
ky3orr 9:75bddbfbb692 116 digit_reg = max7221_reg_digit4;
ky3orr 9:75bddbfbb692 117 break;
ky3orr 9:75bddbfbb692 118 case 5:
ky3orr 9:75bddbfbb692 119 digit_reg = max7221_reg_digit5;
ky3orr 9:75bddbfbb692 120 break;
ky3orr 9:75bddbfbb692 121 case 6:
ky3orr 9:75bddbfbb692 122 digit_reg = max7221_reg_digit6;
ky3orr 9:75bddbfbb692 123 break;
ky3orr 9:75bddbfbb692 124 case 7:
ky3orr 9:75bddbfbb692 125 digit_reg = max7221_reg_digit7;
ky3orr 9:75bddbfbb692 126 break;
ky3orr 9:75bddbfbb692 127 default:
ky3orr 9:75bddbfbb692 128 digit_reg = max7221_reg_noop;
ky3orr 9:75bddbfbb692 129 break;
ky3orr 9:75bddbfbb692 130 }
ky3orr 9:75bddbfbb692 131 Write(digit_reg, value);
ky3orr 9:75bddbfbb692 132 }
ky3orr 7:a160cb7cdd86 133 }
jakowisp 1:d8589d1f368c 134
ky3orr 7:a160cb7cdd86 135 void Max7221::Intensity(unsigned int intensity) {
ky3orr 7:a160cb7cdd86 136 if(intensity > 0x0F) {
ky3orr 7:a160cb7cdd86 137 intensity = 0x0F;
ky3orr 7:a160cb7cdd86 138 }
ky3orr 9:75bddbfbb692 139 Write(max7221_reg_intensity, intensity);
jakowisp 1:d8589d1f368c 140 }
jakowisp 1:d8589d1f368c 141
ky3orr 7:a160cb7cdd86 142 void Max7221::OperationMode(bool mode) {
ky3orr 7:a160cb7cdd86 143 if(mode) {
ky3orr 9:75bddbfbb692 144 Write(max7221_reg_shutdown, 0x01);
ky3orr 7:a160cb7cdd86 145 } else {
ky3orr 9:75bddbfbb692 146 Write(max7221_reg_shutdown, 0x00);
jakowisp 1:d8589d1f368c 147 }
jakowisp 1:d8589d1f368c 148 }
jakowisp 2:828c62cc1861 149
ky3orr 7:a160cb7cdd86 150 void Max7221::Setup () {
ky3orr 7:a160cb7cdd86 151 unsigned int i;
ky3orr 7:a160cb7cdd86 152
ky3orr 7:a160cb7cdd86 153 TestMode(false); // Disable display test
ky3orr 7:a160cb7cdd86 154 UseDigitsNo(8); // Use all 8 digits
ky3orr 7:a160cb7cdd86 155 DecodeMode(0xFF); // Turn on Code B font decode for all digits
ky3orr 9:75bddbfbb692 156 for(i=0;i<8;i++) { // Clean all digits
ky3orr 7:a160cb7cdd86 157 WriteDigit(i, 0x0F);
ky3orr 7:a160cb7cdd86 158 }
ky3orr 7:a160cb7cdd86 159 Intensity(0x01); // Set lowest display intensity(0x00-0xFF)
ky3orr 7:a160cb7cdd86 160 OperationMode(true); // Enable operation mode
ky3orr 7:a160cb7cdd86 161 }