EA_PCA9532_HelloWorld - Simple Hello World for the PCA9532 on the Embedde…

Users » chris » Code » EA_PCA9532_HelloWorld

Chris Styles / Mbed 2 deprecated EA_PCA9532_HelloWorld

Simple Hello World for the PCA9532 on the Embedded Artists Baseboard

PCA9532.cpp@1:bd3f6bfeebac, 2010-05-07 (annotated)

Committer:: chris
Date:: Fri May 07 12:40:00 2010 +0000
Revision:: 1:bd3f6bfeebac

Who changed what in which revision?

User	Revision	Line number	New contents of line
chris	1:bd3f6bfeebac	1	/* mbed PCF9532 LED Driver Library
chris	1:bd3f6bfeebac	2	*
chris	1:bd3f6bfeebac	3	* Copyright (c) 2010, cstyles (http://mbed.org)
chris	1:bd3f6bfeebac	4	*
chris	1:bd3f6bfeebac	5	* Permission is hereby granted, free of charge, to any person obtaining a copy
chris	1:bd3f6bfeebac	6	* of this software and associated documentation files (the "Software"), to deal
chris	1:bd3f6bfeebac	7	* in the Software without restriction, including without limitation the rights
chris	1:bd3f6bfeebac	8	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
chris	1:bd3f6bfeebac	9	* copies of the Software, and to permit persons to whom the Software is
chris	1:bd3f6bfeebac	10	* furnished to do so, subject to the following conditions:
chris	1:bd3f6bfeebac	11	*
chris	1:bd3f6bfeebac	12	* The above copyright notice and this permission notice shall be included in
chris	1:bd3f6bfeebac	13	* all copies or substantial portions of the Software.
chris	1:bd3f6bfeebac	14	*
chris	1:bd3f6bfeebac	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
chris	1:bd3f6bfeebac	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
chris	1:bd3f6bfeebac	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
chris	1:bd3f6bfeebac	18	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
chris	1:bd3f6bfeebac	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
chris	1:bd3f6bfeebac	20	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
chris	1:bd3f6bfeebac	21	* THE SOFTWARE.
chris	1:bd3f6bfeebac	22	*/
chris	1:bd3f6bfeebac	23
chris	1:bd3f6bfeebac	24
chris	1:bd3f6bfeebac	25	#include "PCA9532.h"
chris	1:bd3f6bfeebac	26	#include "mbed.h"
chris	1:bd3f6bfeebac	27
chris	1:bd3f6bfeebac	28	/*
chris	1:bd3f6bfeebac	29	Constructor, pin names for I2C and the I2C addrss of the device
chris	1:bd3f6bfeebac	30	*/
chris	1:bd3f6bfeebac	31	PCA9532::PCA9532(PinName scl, PinName sda, int addr)
chris	1:bd3f6bfeebac	32	: _i2c(scl, sda) {
chris	1:bd3f6bfeebac	33
chris	1:bd3f6bfeebac	34	_i2c.frequency(1000000);
chris	1:bd3f6bfeebac	35
chris	1:bd3f6bfeebac	36	_addr = addr;
chris	1:bd3f6bfeebac	37
chris	1:bd3f6bfeebac	38	}
chris	1:bd3f6bfeebac	39
chris	1:bd3f6bfeebac	40
chris	1:bd3f6bfeebac	41
chris	1:bd3f6bfeebac	42
chris	1:bd3f6bfeebac	43
chris	1:bd3f6bfeebac	44	/*
chris	1:bd3f6bfeebac	45	Set the period
chris	1:bd3f6bfeebac	46	*/
chris	1:bd3f6bfeebac	47	int PCA9532::Period (int channel, float period) {
chris	1:bd3f6bfeebac	48
chris	1:bd3f6bfeebac	49	char reg = 0;
chris	1:bd3f6bfeebac	50
chris	1:bd3f6bfeebac	51	if (channel == 0) {
chris	1:bd3f6bfeebac	52	reg = PCA9532_REG_PSC0;
chris	1:bd3f6bfeebac	53	} else if (channel == 1) {
chris	1:bd3f6bfeebac	54	reg = PCA9532_REG_PSC1;
chris	1:bd3f6bfeebac	55	} else {
chris	1:bd3f6bfeebac	56	return (1);
chris	1:bd3f6bfeebac	57	}
chris	1:bd3f6bfeebac	58
chris	1:bd3f6bfeebac	59	if (period > 1.0) {
chris	1:bd3f6bfeebac	60	period = 255;
chris	1:bd3f6bfeebac	61	} else if ( period < 0.0 ) {
chris	1:bd3f6bfeebac	62	period = 0;
chris	1:bd3f6bfeebac	63	} else {
chris	1:bd3f6bfeebac	64	period = 256 * period;
chris	1:bd3f6bfeebac	65	}
chris	1:bd3f6bfeebac	66
chris	1:bd3f6bfeebac	67	_write(reg, period);
chris	1:bd3f6bfeebac	68	return(0);
chris	1:bd3f6bfeebac	69
chris	1:bd3f6bfeebac	70	}
chris	1:bd3f6bfeebac	71
chris	1:bd3f6bfeebac	72
chris	1:bd3f6bfeebac	73	/*
chris	1:bd3f6bfeebac	74	Set the duty cycle
chris	1:bd3f6bfeebac	75	*/
chris	1:bd3f6bfeebac	76	int PCA9532::Duty (int channel, float d) {
chris	1:bd3f6bfeebac	77
chris	1:bd3f6bfeebac	78	char duty = 0;
chris	1:bd3f6bfeebac	79	char reg = 0;
chris	1:bd3f6bfeebac	80
chris	1:bd3f6bfeebac	81	if (channel == 0) {
chris	1:bd3f6bfeebac	82	reg = PCA9532_REG_PWM0;
chris	1:bd3f6bfeebac	83	} else if (channel == 1) {
chris	1:bd3f6bfeebac	84	reg = PCA9532_REG_PWM1;
chris	1:bd3f6bfeebac	85	} else {
chris	1:bd3f6bfeebac	86	return (1);
chris	1:bd3f6bfeebac	87	}
chris	1:bd3f6bfeebac	88
chris	1:bd3f6bfeebac	89	if (d > 1.0) {
chris	1:bd3f6bfeebac	90	duty = 255;
chris	1:bd3f6bfeebac	91	} else if ( d < 0.0 ) {
chris	1:bd3f6bfeebac	92	duty = 0;
chris	1:bd3f6bfeebac	93	} else {
chris	1:bd3f6bfeebac	94	duty = 256 * d;
chris	1:bd3f6bfeebac	95	}
chris	1:bd3f6bfeebac	96
chris	1:bd3f6bfeebac	97	_write(reg, duty);
chris	1:bd3f6bfeebac	98	return(0);
chris	1:bd3f6bfeebac	99
chris	1:bd3f6bfeebac	100	}
chris	1:bd3f6bfeebac	101
chris	1:bd3f6bfeebac	102	/*
chris	1:bd3f6bfeebac	103	Set each of the LEDs in this mask to the give mode
chris	1:bd3f6bfeebac	104	Loop through the mask calling SetLed on each match
chris	1:bd3f6bfeebac	105	alt_mode specifies the mode of the non-Matches of SetMode
chris	1:bd3f6bfeebac	106	*/
chris	1:bd3f6bfeebac	107	int PCA9532::SetMode (int mask, int mode) {
chris	1:bd3f6bfeebac	108	if ( (mode < 0) \|\| (mode > 3) ) {
chris	1:bd3f6bfeebac	109	return(1);
chris	1:bd3f6bfeebac	110	} else {
chris	1:bd3f6bfeebac	111	for (int i=0 ; i < 16 ; i++ ) {
chris	1:bd3f6bfeebac	112
chris	1:bd3f6bfeebac	113	// if this matches, set the LED to the mode
chris	1:bd3f6bfeebac	114	if (mask & (0x1 << i)) {
chris	1:bd3f6bfeebac	115	SetLed(i,mode);
chris	1:bd3f6bfeebac	116	}
chris	1:bd3f6bfeebac	117	}
chris	1:bd3f6bfeebac	118	}
chris	1:bd3f6bfeebac	119	return(0);
chris	1:bd3f6bfeebac	120	}
chris	1:bd3f6bfeebac	121
chris	1:bd3f6bfeebac	122
chris	1:bd3f6bfeebac	123
chris	1:bd3f6bfeebac	124	/*
chris	1:bd3f6bfeebac	125	led is in the range 0-15
chris	1:bd3f6bfeebac	126	mode is inthe range 0-3
chris	1:bd3f6bfeebac	127	*/
chris	1:bd3f6bfeebac	128	int PCA9532::SetLed(int led, int mode) {
chris	1:bd3f6bfeebac	129
chris	1:bd3f6bfeebac	130	int reg = 0;
chris	1:bd3f6bfeebac	131	int offset = (led % 4);
chris	1:bd3f6bfeebac	132
chris	1:bd3f6bfeebac	133	printf("\nSetLed(%d,%d)\n", led, mode);
chris	1:bd3f6bfeebac	134
chris	1:bd3f6bfeebac	135	// makesure mode is within bounds
chris	1:bd3f6bfeebac	136	if ( (mode < 0) \|\| (mode > 3) ) {
chris	1:bd3f6bfeebac	137	printf("Error : Invalid mode supplied\n");
chris	1:bd3f6bfeebac	138	return(1);
chris	1:bd3f6bfeebac	139	}
chris	1:bd3f6bfeebac	140
chris	1:bd3f6bfeebac	141	// determine which register this is,
chris	1:bd3f6bfeebac	142	if (led < 4) {
chris	1:bd3f6bfeebac	143	reg = PCA9532_REG_LS0;
chris	1:bd3f6bfeebac	144	} else if ( (led > 3) && (led < 8) ) {
chris	1:bd3f6bfeebac	145	reg = PCA9532_REG_LS1;
chris	1:bd3f6bfeebac	146	} else if ( (led > 7) && (led < 12) ) {
chris	1:bd3f6bfeebac	147	reg = PCA9532_REG_LS2;
chris	1:bd3f6bfeebac	148	} else if ( (led > 11) && (led < 16) ) {
chris	1:bd3f6bfeebac	149	reg = PCA9532_REG_LS3;
chris	1:bd3f6bfeebac	150	} else {
chris	1:bd3f6bfeebac	151	return(1);
chris	1:bd3f6bfeebac	152	}
chris	1:bd3f6bfeebac	153
chris	1:bd3f6bfeebac	154	// read the current status of the register
chris	1:bd3f6bfeebac	155	char regval = _read(reg);
chris	1:bd3f6bfeebac	156
chris	1:bd3f6bfeebac	157	// clear the two bit slice at the calculated offset
chris	1:bd3f6bfeebac	158	regval &= ~(0x3 << (2 * offset));
chris	1:bd3f6bfeebac	159
chris	1:bd3f6bfeebac	160	// now OR in the mode, shifted by 2*offset
chris	1:bd3f6bfeebac	161	regval \|= (mode << (2 * offset));
chris	1:bd3f6bfeebac	162
chris	1:bd3f6bfeebac	163	// write the new value back
chris	1:bd3f6bfeebac	164	_write(reg, regval);
chris	1:bd3f6bfeebac	165
chris	1:bd3f6bfeebac	166	return(0);
chris	1:bd3f6bfeebac	167	}
chris	1:bd3f6bfeebac	168
chris	1:bd3f6bfeebac	169
chris	1:bd3f6bfeebac	170
chris	1:bd3f6bfeebac	171	// private functions for low level IO
chris	1:bd3f6bfeebac	172
chris	1:bd3f6bfeebac	173	void PCA9532::_write(int reg, int data) {
chris	1:bd3f6bfeebac	174	char args[2];
chris	1:bd3f6bfeebac	175	args[0] = reg;
chris	1:bd3f6bfeebac	176	args[1] = data;
chris	1:bd3f6bfeebac	177	_i2c.write(_addr, args,2);
chris	1:bd3f6bfeebac	178	}
chris	1:bd3f6bfeebac	179
chris	1:bd3f6bfeebac	180	int PCA9532::_read(int reg) {
chris	1:bd3f6bfeebac	181	char args[2];
chris	1:bd3f6bfeebac	182	args[0] = reg;
chris	1:bd3f6bfeebac	183	_i2c.write(_addr, args, 1);
chris	1:bd3f6bfeebac	184	_i2c.read(_addr, args, 1);
chris	1:bd3f6bfeebac	185	return(args[0]);
chris	1:bd3f6bfeebac	186	}
chris	1:bd3f6bfeebac	187
chris	1:bd3f6bfeebac	188
chris	1:bd3f6bfeebac	189
chris	1:bd3f6bfeebac	190
chris	1:bd3f6bfeebac	191

Repository toolbox

Export to desktop IDE

Build repository

Repository details

Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	16 Apr 2010
Imports:	7
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

PCA9532.cpp@1:bd3f6bfeebac, 2010-05-07 (annotated)

Who changed what in which revision?

Repository toolbox

Repository details

Important Information for this Arm website

Access Warning