MAX7456_2 -

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Liam Faruq / Mbed 2 deprecated MAX7456_2

MAX7456.cpp@2:46adf929a2ba, 2010-08-23 (annotated)

Committer:: faruq
Date:: Mon Aug 23 14:36:14 2010 +0000
Revision:: 2:46adf929a2ba
Parent:: 1:ba08ad32bb88
Child:: 3:599209bd1270

Who changed what in which revision?

User	Revision	Line number	New contents of line
faruq	0:869f2c6f960d	1	#include "mbed.h"
faruq	0:869f2c6f960d	2	#include "MAX7456.h"
faruq	0:869f2c6f960d	3
faruq	0:869f2c6f960d	4	namespace mbed {
faruq	0:869f2c6f960d	5
faruq	0:869f2c6f960d	6
faruq	0:869f2c6f960d	7
faruq	0:869f2c6f960d	8	MAX7456::MAX7456(PinName mosi, PinName miso, PinName clk, PinName ncs, PinName nrst, const char* name)
faruq	0:869f2c6f960d	9	: Stream(name), _spi(mosi, miso, clk), _ncs(ncs),_nrst(nrst) {
faruq	0:869f2c6f960d	10
faruq	0:869f2c6f960d	11	// initialisation code here
faruq	0:869f2c6f960d	12
faruq	0:869f2c6f960d	13	_nrst = 0;
faruq	0:869f2c6f960d	14	wait (0.5);
faruq	0:869f2c6f960d	15	_nrst = 1;
faruq	0:869f2c6f960d	16	wait (0.5);
faruq	0:869f2c6f960d	17
faruq	0:869f2c6f960d	18	// Setup the spi for 8 bit data, high steady state clock,
faruq	0:869f2c6f960d	19	// second edge capture
faruq	0:869f2c6f960d	20	_spi.format(8,0);
faruq	0:869f2c6f960d	21
faruq	0:869f2c6f960d	22	// 1MHz clock
faruq	0:869f2c6f960d	23	_spi.frequency(1000000);
faruq	0:869f2c6f960d	24	}
faruq	0:869f2c6f960d	25
faruq	0:869f2c6f960d	26
faruq	0:869f2c6f960d	27	void MAX7456::cls() {
faruq	0:869f2c6f960d	28	int tmp=0;
faruq	0:869f2c6f960d	29	tmp = _read(DMM);
faruq	0:869f2c6f960d	30	tmp &= 0xFB;
faruq	0:869f2c6f960d	31	_write(DMM,tmp); //Make sure that DMM[2]=0 so that there can be write operations
faruq	0:869f2c6f960d	32
faruq	0:869f2c6f960d	33	tmp = _read(DMM);
faruq	0:869f2c6f960d	34	tmp \|= 0x04;
faruq	0:869f2c6f960d	35	_write (DMM,tmp); //set DMM[2]=1 to clear all locations
faruq	0:869f2c6f960d	36
faruq	0:869f2c6f960d	37	// should wait until DMM[2] goes back to zero, so we know the reset it finished
faruq	0:869f2c6f960d	38
faruq	0:869f2c6f960d	39	}
faruq	0:869f2c6f960d	40
faruq	0:869f2c6f960d	41
faruq	1:ba08ad32bb88	42	void MAX7456::locate(int x, int y) {
faruq	0:869f2c6f960d	43	if ( (x<30) && (y<16) ) {
faruq	0:869f2c6f960d	44	int add = y*30+x; //formula for converting coordinates into denary location
faruq	0:869f2c6f960d	45	_write(DMAL,add);
faruq	0:869f2c6f960d	46	_write(DMAH,add>>8); // what does the ">>" mean?
faruq	0:869f2c6f960d	47	}
faruq	0:869f2c6f960d	48	}
faruq	0:869f2c6f960d	49
faruq	2:46adf929a2ba	50	/*
faruq	2:46adf929a2ba	51	void MAX7456::show(){
faruq	2:46adf929a2ba	52	_write(DMAL,0x1e); // location (0,1)
faruq	2:46adf929a2ba	53	_write(DMDI,0x21); // writing the charater address "W" into DMDI
faruq	0:869f2c6f960d	54
faruq	2:46adf929a2ba	55	_write(DMAL,0x1f); // location (0,1)
faruq	2:46adf929a2ba	56	_write(DMDI,0x19); // writing the charater address "O" into DMDI
faruq	2:46adf929a2ba	57
faruq	2:46adf929a2ba	58	_write(DMAL,0x20); // location (0,1)
faruq	2:46adf929a2ba	59	_write(DMDI,0x1C); // writing the charater address "R" into DMDI
faruq	2:46adf929a2ba	60
faruq	2:46adf929a2ba	61	_write(DMAL,0x21); // location (0,1)
faruq	2:46adf929a2ba	62	_write(DMDI,0x16); // writing the charater address "L" into DMDI
faruq	2:46adf929a2ba	63
faruq	2:46adf929a2ba	64	_write(DMAL,0x22); // location (0,1)
faruq	2:46adf929a2ba	65	_write(DMDI,0x0E); // writing the charater address "D" into DMDI 0x0E
faruq	2:46adf929a2ba	66	}
faruq	2:46adf929a2ba	67	*/
faruq	0:869f2c6f960d	68
faruq	0:869f2c6f960d	69	int MAX7456::_getc() {
faruq	1:ba08ad32bb88	70
faruq	0:869f2c6f960d	71	return(0);
faruq	0:869f2c6f960d	72	}
faruq	0:869f2c6f960d	73
faruq	1:ba08ad32bb88	74	void MAX7456::test(){
faruq	1:ba08ad32bb88	75	for (int i = 0 ; i < 255 ; i++) {
faruq	1:ba08ad32bb88	76	printf("Writing 0x%x to VM1\n",i);
faruq	1:ba08ad32bb88	77	_write(VM1,i);
faruq	1:ba08ad32bb88	78	wait (0.01);
faruq	1:ba08ad32bb88	79	int a = _read(VM1);
faruq	1:ba08ad32bb88	80	printf("Read 0x%x from VM1\n",a);
faruq	1:ba08ad32bb88	81	}
faruq	1:ba08ad32bb88	82	int b = _read(VM1);
faruq	1:ba08ad32bb88	83	printf("Read 0x%x from VM1\n",b);
faruq	1:ba08ad32bb88	84	}
faruq	0:869f2c6f960d	85
faruq	0:869f2c6f960d	86	int MAX7456::_putc(int c) {
faruq	0:869f2c6f960d	87
faruq	0:869f2c6f960d	88	if ((c >= 0x31)&&(c <= 0x39)) { //characters from 1-9
faruq	0:869f2c6f960d	89	c= c-0x30;
faruq	2:46adf929a2ba	90	}
faruq	2:46adf929a2ba	91	else if ((c >= 0x41)&&(c <= 0x5A)) { // characters from A-Z
faruq	0:869f2c6f960d	92	c= c-0x36;
faruq	2:46adf929a2ba	93	}
faruq	2:46adf929a2ba	94	else if ((c >= 0x61)&&(c <= 0x7A)) { // characters from a-z
faruq	0:869f2c6f960d	95	c= c-0x3C;
faruq	2:46adf929a2ba	96	}
faruq	2:46adf929a2ba	97	else if ((c == 0x28)&&(c == 0x29)) { //brackets ()
faruq	0:869f2c6f960d	98	c= c + 0x17;
faruq	0:869f2c6f960d	99	}
faruq	0:869f2c6f960d	100
faruq	0:869f2c6f960d	101	_write(DMDI,c);
faruq	0:869f2c6f960d	102
faruq	0:869f2c6f960d	103	return(c);
faruq	0:869f2c6f960d	104	}
faruq	0:869f2c6f960d	105
faruq	1:ba08ad32bb88	106	void MAX7456::setdarkness() {
faruq	0:869f2c6f960d	107	_write(VM1,0xC7);
faruq	1:ba08ad32bb88	108	}
faruq	0:869f2c6f960d	109
faruq	1:ba08ad32bb88	110	void MAX7456::initaddress() {
faruq	1:ba08ad32bb88	111	int d = _read(DMAH);
faruq	1:ba08ad32bb88	112	d= d&0xFC;
faruq	1:ba08ad32bb88	113	_write(DMAH,d); // setting DMAH[1]=0
faruq	1:ba08ad32bb88	114	// to module to read/write character address byte
faruq	1:ba08ad32bb88	115	}
faruq	0:869f2c6f960d	116
faruq	0:869f2c6f960d	117
faruq	0:869f2c6f960d	118
faruq	0:869f2c6f960d	119
faruq	0:869f2c6f960d	120	void MAX7456::vtrim(int v) {
faruq	0:869f2c6f960d	121	}
faruq	0:869f2c6f960d	122
faruq	0:869f2c6f960d	123	void MAX7456::htrim(int h) {
faruq	0:869f2c6f960d	124	}
faruq	0:869f2c6f960d	125
faruq	0:869f2c6f960d	126
faruq	1:ba08ad32bb88	127
faruq	0:869f2c6f960d	128	void MAX7456::format (char mode) {
faruq	0:869f2c6f960d	129
faruq	0:869f2c6f960d	130	if (mode == 'P') {
faruq	0:869f2c6f960d	131	_write(VM0,0x78); // PAL
faruq	0:869f2c6f960d	132	} else if (mode == 'N') {
faruq	0:869f2c6f960d	133	_write(VM0,0x78); // NTSC
faruq	0:869f2c6f960d	134	}
faruq	1:ba08ad32bb88	135
faruq	0:869f2c6f960d	136	}
faruq	0:869f2c6f960d	137
faruq	0:869f2c6f960d	138	int MAX7456::_read(int address) {
faruq	0:869f2c6f960d	139	// force bit 7 to 1 for a read
faruq	0:869f2c6f960d	140	address \|= 0x80;
faruq	0:869f2c6f960d	141	_ncs=0; // select device
faruq	0:869f2c6f960d	142	_spi.write(address); // send address
faruq	0:869f2c6f960d	143	int value = _spi.write(0x00); // send dummy
faruq	0:869f2c6f960d	144	_ncs=1; //deselect device
faruq	0:869f2c6f960d	145	return (value);
faruq	0:869f2c6f960d	146	}
faruq	0:869f2c6f960d	147
faruq	0:869f2c6f960d	148	void MAX7456::_write(int address, int data) {
faruq	0:869f2c6f960d	149	// force bit 7 to 0 for a write
faruq	0:869f2c6f960d	150	address &= 0x7f;
faruq	0:869f2c6f960d	151	// select the device
faruq	0:869f2c6f960d	152	_ncs = 0;
faruq	0:869f2c6f960d	153	// write VM1
faruq	0:869f2c6f960d	154	_spi.write(address); // send address
faruq	0:869f2c6f960d	155	_spi.write(data); // send some data
faruq	0:869f2c6f960d	156	// Deselect the device
faruq	0:869f2c6f960d	157	_ncs = 1;
faruq	0:869f2c6f960d	158	}
faruq	0:869f2c6f960d	159
faruq	0:869f2c6f960d	160	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	23 Aug 2010
Imports:	4
Forks:	0
Commits:	6
Dependents:	0
Dependencies:	1
Followers:	2

MAX7456.cpp@2:46adf929a2ba, 2010-08-23 (annotated)

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