Jon Trinder / Mbed 2 deprecated gu_remote_display_test

Demo for Glasgow Students that writes to dot matrix display and sends the display data out of the serial port

Dependencies:   mbed

main.cpp@0:bc2c0a19b0e5, 2015-02-19 (annotated)

Committer:
jont
Date:
Thu Feb 19 08:38:28 2015 +0000
Revision:
0:bc2c0a19b0e5
First release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jont 0:bc2c0a19b0e5 1 #include "mbed.h"
jont 0:bc2c0a19b0e5 2 /*
jont 0:bc2c0a19b0e5 3 example of driving maxim chip for Glasgow Uni Projects.
jont 0:bc2c0a19b0e5 4
jont 0:bc2c0a19b0e5 5 Dr J.J.Trinder 2013,14,15
jont 0:bc2c0a19b0e5 6
jont 0:bc2c0a19b0e5 7 This one modified to also send display data out of serial port for a remote simulated display
jont 0:bc2c0a19b0e5 8 for more info email me
jont 0:bc2c0a19b0e5 9 jon.trinder@glasgow.ac.uk
jont 0:bc2c0a19b0e5 10 jont@ninelocks.com
jont 0:bc2c0a19b0e5 11
jont 0:bc2c0a19b0e5 12 */
jont 0:bc2c0a19b0e5 13
jont 0:bc2c0a19b0e5 14 #define max7219_reg_noop 0x00
jont 0:bc2c0a19b0e5 15 #define max7219_reg_digit0 0x01
jont 0:bc2c0a19b0e5 16 #define max7219_reg_digit1 0x02
jont 0:bc2c0a19b0e5 17 #define max7219_reg_digit2 0x03
jont 0:bc2c0a19b0e5 18 #define max7219_reg_digit3 0x04
jont 0:bc2c0a19b0e5 19 #define max7219_reg_digit4 0x05
jont 0:bc2c0a19b0e5 20 #define max7219_reg_digit5 0x06
jont 0:bc2c0a19b0e5 21 #define max7219_reg_digit6 0x07
jont 0:bc2c0a19b0e5 22 #define max7219_reg_digit7 0x08
jont 0:bc2c0a19b0e5 23 #define max7219_reg_decodeMode 0x09
jont 0:bc2c0a19b0e5 24 #define max7219_reg_intensity 0x0a
jont 0:bc2c0a19b0e5 25 #define max7219_reg_scanLimit 0x0b
jont 0:bc2c0a19b0e5 26 #define max7219_reg_shutdown 0x0c
jont 0:bc2c0a19b0e5 27 #define max7219_reg_displayTest 0x0f
jont 0:bc2c0a19b0e5 28
jont 0:bc2c0a19b0e5 29 #define LOW 0
jont 0:bc2c0a19b0e5 30 #define HIGH 1
jont 0:bc2c0a19b0e5 31
jont 0:bc2c0a19b0e5 32 //serial port
jont 0:bc2c0a19b0e5 33
jont 0:bc2c0a19b0e5 34 Serial pc(USBTX, USBRX); // tx, rx
jont 0:bc2c0a19b0e5 35
jont 0:bc2c0a19b0e5 36 SPI max72_spi(PTD2, NC, PTD1);
jont 0:bc2c0a19b0e5 37 DigitalOut load(PTD0); //will provide the load signal
jont 0:bc2c0a19b0e5 38
jont 0:bc2c0a19b0e5 39
jont 0:bc2c0a19b0e5 40 char pattern_diagonal[8] = { 0x01, 0x2,0x4,0x08,0x10,0x20,0x40,0x80};
jont 0:bc2c0a19b0e5 41 char pattern_square[8] = { 0xff, 0x81,0x81,0x81,0x81,0x81,0x81,0xff};
jont 0:bc2c0a19b0e5 42 char pattern_star[8] = { 0x04, 0x15, 0x0e, 0x1f, 0x0e, 0x15, 0x04, 0x00};
jont 0:bc2c0a19b0e5 43
jont 0:bc2c0a19b0e5 44
jont 0:bc2c0a19b0e5 45 /*
jont 0:bc2c0a19b0e5 46 Write to the maxim via SPI
jont 0:bc2c0a19b0e5 47 args register and the column data
jont 0:bc2c0a19b0e5 48 */
jont 0:bc2c0a19b0e5 49 void write_to_max( int reg, int col)
jont 0:bc2c0a19b0e5 50 {
jont 0:bc2c0a19b0e5 51 load = LOW; // begin
jont 0:bc2c0a19b0e5 52 max72_spi.write(reg); // specify register
jont 0:bc2c0a19b0e5 53 max72_spi.write(col); // put data
jont 0:bc2c0a19b0e5 54 load = HIGH; // make sure data is loaded (on rising edge of LOAD/CS)
jont 0:bc2c0a19b0e5 55 }
jont 0:bc2c0a19b0e5 56
jont 0:bc2c0a19b0e5 57 //writes 8 bytes to the display
jont 0:bc2c0a19b0e5 58 void pattern_to_display(char *testdata){
jont 0:bc2c0a19b0e5 59 int cdata;
jont 0:bc2c0a19b0e5 60 for(int idx = 0; idx <= 7; idx++) {
jont 0:bc2c0a19b0e5 61 cdata = testdata[idx];
jont 0:bc2c0a19b0e5 62 write_to_max(idx+1,cdata);
jont 0:bc2c0a19b0e5 63
jont 0:bc2c0a19b0e5 64 //writet to the pretend display on the serial port
jont 0:bc2c0a19b0e5 65 if(pc != NULL) {
jont 0:bc2c0a19b0e5 66 pc.printf("%i;%02x\r\n", idx,cdata);
jont 0:bc2c0a19b0e5 67 }
jont 0:bc2c0a19b0e5 68 }
jont 0:bc2c0a19b0e5 69 }
jont 0:bc2c0a19b0e5 70
jont 0:bc2c0a19b0e5 71
jont 0:bc2c0a19b0e5 72 void setup_dot_matrix ()
jont 0:bc2c0a19b0e5 73 {
jont 0:bc2c0a19b0e5 74 // initiation of the max 7219
jont 0:bc2c0a19b0e5 75 // SPI setup: 8 bits, mode 0
jont 0:bc2c0a19b0e5 76 max72_spi.format(8, 0);
jont 0:bc2c0a19b0e5 77
jont 0:bc2c0a19b0e5 78
jont 0:bc2c0a19b0e5 79
jont 0:bc2c0a19b0e5 80 max72_spi.frequency(100000); //down to 100khx easier to scope ;-)
jont 0:bc2c0a19b0e5 81
jont 0:bc2c0a19b0e5 82
jont 0:bc2c0a19b0e5 83 write_to_max(max7219_reg_scanLimit, 0x07);
jont 0:bc2c0a19b0e5 84 write_to_max(max7219_reg_decodeMode, 0x00); // using an led matrix (not digits)
jont 0:bc2c0a19b0e5 85 write_to_max(max7219_reg_shutdown, 0x01); // not in shutdown mode
jont 0:bc2c0a19b0e5 86 write_to_max(max7219_reg_displayTest, 0x00); // no display test
jont 0:bc2c0a19b0e5 87 for (int e=1; e<=8; e++) { // empty registers, turn all LEDs off
jont 0:bc2c0a19b0e5 88 write_to_max(e,0);
jont 0:bc2c0a19b0e5 89 }
jont 0:bc2c0a19b0e5 90 // maxAll(max7219_reg_intensity, 0x0f & 0x0f); // the first 0x0f is the value you can set
jont 0:bc2c0a19b0e5 91 write_to_max(max7219_reg_intensity, 0x08);
jont 0:bc2c0a19b0e5 92
jont 0:bc2c0a19b0e5 93 }
jont 0:bc2c0a19b0e5 94
jont 0:bc2c0a19b0e5 95 void clear(){
jont 0:bc2c0a19b0e5 96 for (int e=1; e<=8; e++) { // empty registers, turn all LEDs off
jont 0:bc2c0a19b0e5 97 write_to_max(e,0);
jont 0:bc2c0a19b0e5 98 }
jont 0:bc2c0a19b0e5 99 }
jont 0:bc2c0a19b0e5 100
jont 0:bc2c0a19b0e5 101
jont 0:bc2c0a19b0e5 102 int main()
jont 0:bc2c0a19b0e5 103 {
jont 0:bc2c0a19b0e5 104 pc.baud(9600); //setup serial port to 9600
jont 0:bc2c0a19b0e5 105 setup_dot_matrix (); /* setup matric */
jont 0:bc2c0a19b0e5 106 while(1){
jont 0:bc2c0a19b0e5 107 //da_star();
jont 0:bc2c0a19b0e5 108 pattern_to_display(pattern_diagonal);
jont 0:bc2c0a19b0e5 109 wait_ms(1000);
jont 0:bc2c0a19b0e5 110 pattern_to_display(pattern_square);
jont 0:bc2c0a19b0e5 111 wait_ms(1000);
jont 0:bc2c0a19b0e5 112 pattern_to_display(pattern_star);
jont 0:bc2c0a19b0e5 113 wait_ms(1000);
jont 0:bc2c0a19b0e5 114 clear();
jont 0:bc2c0a19b0e5 115
jont 0:bc2c0a19b0e5 116 }
jont 0:bc2c0a19b0e5 117 }