Grzegorz Kaczmarek
/
Max7221
Fix to have load pin working with SPI1.
Fork of Max7221 by
MAX7221/Max7221.h@2:828c62cc1861, 2013-08-07 (annotated)
- Committer:
- jakowisp
- Date:
- Wed Aug 07 02:15:17 2013 +0000
- Revision:
- 2:828c62cc1861
- Parent:
- 1:d8589d1f368c
Added Comments for publication.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
jakowisp | 2:828c62cc1861 | 1 | /** |
jakowisp | 2:828c62cc1861 | 2 | * @file Max7221.h |
jakowisp | 2:828c62cc1861 | 3 | * @brief This file contains the class defnition of Max7221 and define statements related to the class, and max7221 device |
jakowisp | 2:828c62cc1861 | 4 | * The methods in this class are derived from posts on the mbed forum written by Igor Skochinsky on October 2009 |
jakowisp | 2:828c62cc1861 | 5 | * |
jakowisp | 2:828c62cc1861 | 6 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 7 | * |
jakowisp | 2:828c62cc1861 | 8 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 9 | */ |
jakowisp | 1:d8589d1f368c | 10 | #ifndef Max7221_H |
jakowisp | 1:d8589d1f368c | 11 | #define Max7221_H |
jakowisp | 1:d8589d1f368c | 12 | |
jakowisp | 2:828c62cc1861 | 13 | /** Max7221 Example |
jakowisp | 2:828c62cc1861 | 14 | * @code |
jakowisp | 2:828c62cc1861 | 15 | * #include "mbed.h" |
jakowisp | 2:828c62cc1861 | 16 | * #include "Max7221.h" |
jakowisp | 2:828c62cc1861 | 17 | * |
jakowisp | 2:828c62cc1861 | 18 | * |
jakowisp | 2:828c62cc1861 | 19 | * // p5: DIN, p7: CLK, p8: LOAD/CS |
jakowisp | 2:828c62cc1861 | 20 | * Max7221 max7221disp1(p5, p7, p8); |
jakowisp | 2:828c62cc1861 | 21 | * //Max7221 max7221disp2(p5, p7, p8); |
jakowisp | 2:828c62cc1861 | 22 | * //Max7221 max7221disp3(p11, p13, p14); |
jakowisp | 2:828c62cc1861 | 23 | * //Max7221 max7221disp4(p11, p13, p14); |
jakowisp | 2:828c62cc1861 | 24 | * |
jakowisp | 2:828c62cc1861 | 25 | * int count=-99; |
jakowisp | 2:828c62cc1861 | 26 | * |
jakowisp | 2:828c62cc1861 | 27 | * void loop(void) { |
jakowisp | 2:828c62cc1861 | 28 | * max7221disp1.WriteInt(count); |
jakowisp | 2:828c62cc1861 | 29 | * if (count < 100) |
jakowisp | 2:828c62cc1861 | 30 | * count=count+1; |
jakowisp | 2:828c62cc1861 | 31 | * else |
jakowisp | 2:828c62cc1861 | 32 | * count=-99; |
jakowisp | 2:828c62cc1861 | 33 | * } |
jakowisp | 2:828c62cc1861 | 34 | * |
jakowisp | 2:828c62cc1861 | 35 | * int main() { |
jakowisp | 2:828c62cc1861 | 36 | * max7221disp1.Setup(); |
jakowisp | 2:828c62cc1861 | 37 | * //Max7221::SetupALl(); |
jakowisp | 2:828c62cc1861 | 38 | * max7221disp1.WriteFloat(123.125); |
jakowisp | 2:828c62cc1861 | 39 | * wait(1.0); |
jakowisp | 2:828c62cc1861 | 40 | * |
jakowisp | 2:828c62cc1861 | 41 | * while (1) { |
jakowisp | 2:828c62cc1861 | 42 | * loop(); |
jakowisp | 2:828c62cc1861 | 43 | * wait(1.0); |
jakowisp | 2:828c62cc1861 | 44 | * } |
jakowisp | 2:828c62cc1861 | 45 | * } |
jakowisp | 2:828c62cc1861 | 46 | * @endcode |
jakowisp | 2:828c62cc1861 | 47 | */ |
jakowisp | 2:828c62cc1861 | 48 | |
jakowisp | 1:d8589d1f368c | 49 | // define max7219/max7221 registers |
jakowisp | 1:d8589d1f368c | 50 | #define max7219_reg_noop 0x00 |
jakowisp | 1:d8589d1f368c | 51 | #define max7219_reg_digit0 0x01 |
jakowisp | 1:d8589d1f368c | 52 | #define max7219_reg_digit1 0x02 |
jakowisp | 1:d8589d1f368c | 53 | #define max7219_reg_digit2 0x03 |
jakowisp | 1:d8589d1f368c | 54 | #define max7219_reg_digit3 0x04 |
jakowisp | 1:d8589d1f368c | 55 | #define max7219_reg_digit4 0x05 |
jakowisp | 1:d8589d1f368c | 56 | #define max7219_reg_digit5 0x06 |
jakowisp | 1:d8589d1f368c | 57 | #define max7219_reg_digit6 0x07 |
jakowisp | 1:d8589d1f368c | 58 | #define max7219_reg_digit7 0x08 |
jakowisp | 1:d8589d1f368c | 59 | #define max7219_reg_decodeMode 0x09 |
jakowisp | 1:d8589d1f368c | 60 | #define max7219_reg_intensity 0x0a |
jakowisp | 1:d8589d1f368c | 61 | #define max7219_reg_scanLimit 0x0b |
jakowisp | 1:d8589d1f368c | 62 | #define max7219_reg_shutdown 0x0c |
jakowisp | 1:d8589d1f368c | 63 | #define max7219_reg_displayTest 0x0f |
jakowisp | 1:d8589d1f368c | 64 | |
jakowisp | 1:d8589d1f368c | 65 | #define LOW 0 |
jakowisp | 1:d8589d1f368c | 66 | #define HIGH 1 |
jakowisp | 1:d8589d1f368c | 67 | #define MHZ 1000000 |
jakowisp | 1:d8589d1f368c | 68 | #define NUMDIGITS 8 |
jakowisp | 1:d8589d1f368c | 69 | |
jakowisp | 1:d8589d1f368c | 70 | #ifdef NUMDIGITS |
jakowisp | 1:d8589d1f368c | 71 | #define UPPERBOUND 99999999 |
jakowisp | 1:d8589d1f368c | 72 | #define LOWERBOUND -9999999 |
jakowisp | 1:d8589d1f368c | 73 | #endif |
jakowisp | 1:d8589d1f368c | 74 | |
jakowisp | 1:d8589d1f368c | 75 | class Max7221 { |
jakowisp | 1:d8589d1f368c | 76 | public: |
jakowisp | 2:828c62cc1861 | 77 | /** |
jakowisp | 2:828c62cc1861 | 78 | * Constructor. This is the default constructor |
jakowisp | 2:828c62cc1861 | 79 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 80 | * @param msoi The SPI pin used as input to the device. Valid values for LPC1768 are p5 or p11 |
jakowisp | 2:828c62cc1861 | 81 | * @param mclk The SPI pin used as clock for the device. Valid values for LPC1768 are p7 or p13 |
jakowisp | 2:828c62cc1861 | 82 | * @param load The pin used to control load for the device. Any pin capable for DigitalOut can be used, but the same load pin must be used for |
jakowisp | 2:828c62cc1861 | 83 | * device that share the same msoi and mclk pins |
jakowisp | 2:828c62cc1861 | 84 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 85 | */ |
jakowisp | 1:d8589d1f368c | 86 | Max7221(PinName msoi=p5, PinName mclk=p7, PinName load=p8); |
jakowisp | 1:d8589d1f368c | 87 | |
jakowisp | 2:828c62cc1861 | 88 | /** |
jakowisp | 2:828c62cc1861 | 89 | * This method is used to write a byte of data to a specified register for only the device defined in this class instance |
jakowisp | 2:828c62cc1861 | 90 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 91 | * @param reg The register to write to. |
jakowisp | 2:828c62cc1861 | 92 | * @param data The value to be written. |
jakowisp | 2:828c62cc1861 | 93 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 94 | */ |
jakowisp | 2:828c62cc1861 | 95 | void Write( unsigned int reg, unsigned int data); |
jakowisp | 2:828c62cc1861 | 96 | |
jakowisp | 2:828c62cc1861 | 97 | /** |
jakowisp | 2:828c62cc1861 | 98 | * This method is used to display an integer to the specified device instance. Underflow and overflow result in '-' written to all digits |
jakowisp | 2:828c62cc1861 | 99 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 100 | * @param value An integer value to display |
jakowisp | 2:828c62cc1861 | 101 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 102 | */ |
jakowisp | 2:828c62cc1861 | 103 | void WriteInt( int value ); |
jakowisp | 2:828c62cc1861 | 104 | |
jakowisp | 2:828c62cc1861 | 105 | /** |
jakowisp | 2:828c62cc1861 | 106 | * This method is used to display a floating point number to the specified device instance. |
jakowisp | 2:828c62cc1861 | 107 | * Underflow and overflow result in '-' written to all digits. The digits after the decimal |
jakowisp | 2:828c62cc1861 | 108 | * point are truncated to fit the display. |
jakowisp | 2:828c62cc1861 | 109 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 110 | * @param value A float value to display |
jakowisp | 2:828c62cc1861 | 111 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 112 | */ |
jakowisp | 2:828c62cc1861 | 113 | void WriteFloat( float value); |
jakowisp | 1:d8589d1f368c | 114 | |
jakowisp | 2:828c62cc1861 | 115 | /** |
jakowisp | 2:828c62cc1861 | 116 | * Overload of the EQUALS operator to provide easy use of the class. |
jakowisp | 2:828c62cc1861 | 117 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 118 | * @param value An integer value to display |
jakowisp | 2:828c62cc1861 | 119 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 120 | */ |
jakowisp | 2:828c62cc1861 | 121 | |
jakowisp | 1:d8589d1f368c | 122 | Max7221& operator= (int value){ |
jakowisp | 1:d8589d1f368c | 123 | WriteInt(value); |
jakowisp | 1:d8589d1f368c | 124 | return *this; |
jakowisp | 1:d8589d1f368c | 125 | }; |
jakowisp | 2:828c62cc1861 | 126 | /** |
jakowisp | 2:828c62cc1861 | 127 | * Overload of the EQUALS operator to provide easy use of the class. |
jakowisp | 2:828c62cc1861 | 128 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 129 | * @param value A float value to display |
jakowisp | 2:828c62cc1861 | 130 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 131 | */ |
jakowisp | 2:828c62cc1861 | 132 | |
jakowisp | 1:d8589d1f368c | 133 | Max7221& operator= (float value){ |
jakowisp | 1:d8589d1f368c | 134 | WriteFloat(value); |
jakowisp | 1:d8589d1f368c | 135 | return *this; |
jakowisp | 1:d8589d1f368c | 136 | }; |
jakowisp | 2:828c62cc1861 | 137 | /** |
jakowisp | 2:828c62cc1861 | 138 | * This method is used to write an intial set off values to the device to prepare it for use. |
jakowisp | 2:828c62cc1861 | 139 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 140 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 141 | */ |
jakowisp | 1:d8589d1f368c | 142 | void Setup (void); |
jakowisp | 2:828c62cc1861 | 143 | |
jakowisp | 2:828c62cc1861 | 144 | /** |
jakowisp | 2:828c62cc1861 | 145 | * This method is used to write a byte of data to a specified register for all the devices instantiated. |
jakowisp | 2:828c62cc1861 | 146 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 147 | * @param reg The register to write to. |
jakowisp | 2:828c62cc1861 | 148 | * @param data The value to be written. |
jakowisp | 2:828c62cc1861 | 149 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 150 | */ |
jakowisp | 2:828c62cc1861 | 151 | static void WriteAll (unsigned int reg, unsigned int data); |
jakowisp | 2:828c62cc1861 | 152 | |
jakowisp | 2:828c62cc1861 | 153 | /** |
jakowisp | 2:828c62cc1861 | 154 | * This method is used to write an intial set off values to ALL device to prepare them for use. |
jakowisp | 2:828c62cc1861 | 155 | * @author Dwayne S. Dilbeck |
jakowisp | 2:828c62cc1861 | 156 | * @date 8/6/2013 |
jakowisp | 2:828c62cc1861 | 157 | */ |
jakowisp | 1:d8589d1f368c | 158 | static void SetupAll (void); |
jakowisp | 1:d8589d1f368c | 159 | |
jakowisp | 1:d8589d1f368c | 160 | private: |
jakowisp | 2:828c62cc1861 | 161 | /// Pointer for the class instance to a particular SPI bus |
jakowisp | 1:d8589d1f368c | 162 | SPI *max72_spi; |
jakowisp | 2:828c62cc1861 | 163 | /// pointer for the class instance of a particular load signal |
jakowisp | 1:d8589d1f368c | 164 | DigitalOut *load; |
jakowisp | 2:828c62cc1861 | 165 | /// id of the class instance |
jakowisp | 1:d8589d1f368c | 166 | int id; |
jakowisp | 2:828c62cc1861 | 167 | /// pointer to the number of devices connected to the SPI bus instance this device instance is connected to. |
jakowisp | 1:d8589d1f368c | 168 | int *maxInUse; |
jakowisp | 1:d8589d1f368c | 169 | |
jakowisp | 2:828c62cc1861 | 170 | ///For the class we have a static set of values. There are 2 SPI buses, 2 load signals, and 2 counters of the number of devices connected to a SPI bus. |
jakowisp | 1:d8589d1f368c | 171 | static SPI *spi1; |
jakowisp | 1:d8589d1f368c | 172 | static SPI *spi2; |
jakowisp | 1:d8589d1f368c | 173 | static DigitalOut *load1; |
jakowisp | 1:d8589d1f368c | 174 | static DigitalOut *load2; |
jakowisp | 1:d8589d1f368c | 175 | static int maxInUseSPI1; |
jakowisp | 1:d8589d1f368c | 176 | static int maxInUseSPI2; |
jakowisp | 1:d8589d1f368c | 177 | }; |
jakowisp | 1:d8589d1f368c | 178 | |
jakowisp | 1:d8589d1f368c | 179 | #endif |