PCA9532 - PCA9532 I2C LED Dimmer. Library files only, no mb…

Users » chris » Code » PCA9532

PCA9532 I2C LED Dimmer. Library files only, no mbed.lib or main.cpp

PCA9532.cpp@0:7993a61d8c59, 2010-05-07 (annotated)

Committer:: chris
Date:: Fri May 07 10:25:42 2010 +0000
Revision:: 0:7993a61d8c59

Who changed what in which revision?

User	Revision	Line number	New contents of line
chris	0:7993a61d8c59	1	/* mbed PCF9532 LED Driver Library
chris	0:7993a61d8c59	2	*
chris	0:7993a61d8c59	3	* Copyright (c) 2010, cstyles (http://mbed.org)
chris	0:7993a61d8c59	4	*
chris	0:7993a61d8c59	5	* Permission is hereby granted, free of charge, to any person obtaining a copy
chris	0:7993a61d8c59	6	* of this software and associated documentation files (the "Software"), to deal
chris	0:7993a61d8c59	7	* in the Software without restriction, including without limitation the rights
chris	0:7993a61d8c59	8	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
chris	0:7993a61d8c59	9	* copies of the Software, and to permit persons to whom the Software is
chris	0:7993a61d8c59	10	* furnished to do so, subject to the following conditions:
chris	0:7993a61d8c59	11	*
chris	0:7993a61d8c59	12	* The above copyright notice and this permission notice shall be included in
chris	0:7993a61d8c59	13	* all copies or substantial portions of the Software.
chris	0:7993a61d8c59	14	*
chris	0:7993a61d8c59	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
chris	0:7993a61d8c59	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
chris	0:7993a61d8c59	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
chris	0:7993a61d8c59	18	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
chris	0:7993a61d8c59	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
chris	0:7993a61d8c59	20	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
chris	0:7993a61d8c59	21	* THE SOFTWARE.
chris	0:7993a61d8c59	22	*/
chris	0:7993a61d8c59	23
chris	0:7993a61d8c59	24
chris	0:7993a61d8c59	25	#include "PCA9532.h"
chris	0:7993a61d8c59	26	#include "mbed.h"
chris	0:7993a61d8c59	27
chris	0:7993a61d8c59	28	/*
chris	0:7993a61d8c59	29	Constructor, pin names for I2C and the I2C addrss of the device
chris	0:7993a61d8c59	30	*/
chris	0:7993a61d8c59	31	PCA9532::PCA9532(PinName scl, PinName sda, int addr)
chris	0:7993a61d8c59	32	: _i2c(scl, sda) {
chris	0:7993a61d8c59	33
chris	0:7993a61d8c59	34	_i2c.frequency(1000000);
chris	0:7993a61d8c59	35
chris	0:7993a61d8c59	36	_addr = addr;
chris	0:7993a61d8c59	37
chris	0:7993a61d8c59	38	}
chris	0:7993a61d8c59	39
chris	0:7993a61d8c59	40
chris	0:7993a61d8c59	41
chris	0:7993a61d8c59	42
chris	0:7993a61d8c59	43
chris	0:7993a61d8c59	44	/*
chris	0:7993a61d8c59	45	Set the period
chris	0:7993a61d8c59	46	*/
chris	0:7993a61d8c59	47	int PCA9532::Period (int channel, float period) {
chris	0:7993a61d8c59	48
chris	0:7993a61d8c59	49	char reg = 0;
chris	0:7993a61d8c59	50
chris	0:7993a61d8c59	51	if (channel == 0) {
chris	0:7993a61d8c59	52	reg = PCA9532_REG_PSC0;
chris	0:7993a61d8c59	53	} else if (channel == 1) {
chris	0:7993a61d8c59	54	reg = PCA9532_REG_PSC1;
chris	0:7993a61d8c59	55	} else {
chris	0:7993a61d8c59	56	return (1);
chris	0:7993a61d8c59	57	}
chris	0:7993a61d8c59	58
chris	0:7993a61d8c59	59	if (period > 1.0) {
chris	0:7993a61d8c59	60	period = 255;
chris	0:7993a61d8c59	61	} else if ( period < 0.0 ) {
chris	0:7993a61d8c59	62	period = 0;
chris	0:7993a61d8c59	63	} else {
chris	0:7993a61d8c59	64	period = 256 * period;
chris	0:7993a61d8c59	65	}
chris	0:7993a61d8c59	66
chris	0:7993a61d8c59	67	_write(reg, period);
chris	0:7993a61d8c59	68	return(0);
chris	0:7993a61d8c59	69
chris	0:7993a61d8c59	70	}
chris	0:7993a61d8c59	71
chris	0:7993a61d8c59	72
chris	0:7993a61d8c59	73	/*
chris	0:7993a61d8c59	74	Set the duty cycle
chris	0:7993a61d8c59	75	*/
chris	0:7993a61d8c59	76	int PCA9532::Duty (int channel, float d) {
chris	0:7993a61d8c59	77
chris	0:7993a61d8c59	78	char duty = 0;
chris	0:7993a61d8c59	79	char reg = 0;
chris	0:7993a61d8c59	80
chris	0:7993a61d8c59	81	if (channel == 0) {
chris	0:7993a61d8c59	82	reg = PCA9532_REG_PWM0;
chris	0:7993a61d8c59	83	} else if (channel == 1) {
chris	0:7993a61d8c59	84	reg = PCA9532_REG_PWM1;
chris	0:7993a61d8c59	85	} else {
chris	0:7993a61d8c59	86	return (1);
chris	0:7993a61d8c59	87	}
chris	0:7993a61d8c59	88
chris	0:7993a61d8c59	89	if (d > 1.0) {
chris	0:7993a61d8c59	90	duty = 255;
chris	0:7993a61d8c59	91	} else if ( d < 0.0 ) {
chris	0:7993a61d8c59	92	duty = 0;
chris	0:7993a61d8c59	93	} else {
chris	0:7993a61d8c59	94	duty = 256 * d;
chris	0:7993a61d8c59	95	}
chris	0:7993a61d8c59	96
chris	0:7993a61d8c59	97	_write(reg, duty);
chris	0:7993a61d8c59	98	return(0);
chris	0:7993a61d8c59	99
chris	0:7993a61d8c59	100	}
chris	0:7993a61d8c59	101
chris	0:7993a61d8c59	102	/*
chris	0:7993a61d8c59	103	Set each of the LEDs in this mask to the give mode
chris	0:7993a61d8c59	104	Loop through the mask calling SetLed on each match
chris	0:7993a61d8c59	105	alt_mode specifies the mode of the non-Matches of SetMode
chris	0:7993a61d8c59	106	*/
chris	0:7993a61d8c59	107	int PCA9532::SetMode (int mask, int mode) {
chris	0:7993a61d8c59	108	if ( (mode < 0) \|\| (mode > 3) ) {
chris	0:7993a61d8c59	109	return(1);
chris	0:7993a61d8c59	110	} else {
chris	0:7993a61d8c59	111	for (int i=0 ; i < 16 ; i++ ) {
chris	0:7993a61d8c59	112
chris	0:7993a61d8c59	113	// if this matches, set the LED to the mode
chris	0:7993a61d8c59	114	if (mask & (0x1 << i)) {
chris	0:7993a61d8c59	115	SetLed(i,mode);
chris	0:7993a61d8c59	116	}
chris	0:7993a61d8c59	117	}
chris	0:7993a61d8c59	118	}
chris	0:7993a61d8c59	119	return(0);
chris	0:7993a61d8c59	120	}
chris	0:7993a61d8c59	121
chris	0:7993a61d8c59	122
chris	0:7993a61d8c59	123
chris	0:7993a61d8c59	124	/*
chris	0:7993a61d8c59	125	led is in the range 0-15
chris	0:7993a61d8c59	126	mode is inthe range 0-3
chris	0:7993a61d8c59	127	*/
chris	0:7993a61d8c59	128	int PCA9532::SetLed(int led, int mode) {
chris	0:7993a61d8c59	129
chris	0:7993a61d8c59	130	int reg = 0;
chris	0:7993a61d8c59	131	int offset = (led % 4);
chris	0:7993a61d8c59	132
chris	0:7993a61d8c59	133	printf("\nSetLed(%d,%d)\n", led, mode);
chris	0:7993a61d8c59	134
chris	0:7993a61d8c59	135	// makesure mode is within bounds
chris	0:7993a61d8c59	136	if ( (mode < 0) \|\| (mode > 3) ) {
chris	0:7993a61d8c59	137	printf("Error : Invalid mode supplied\n");
chris	0:7993a61d8c59	138	return(1);
chris	0:7993a61d8c59	139	}
chris	0:7993a61d8c59	140
chris	0:7993a61d8c59	141	// determine which register this is,
chris	0:7993a61d8c59	142	if (led < 4) {
chris	0:7993a61d8c59	143	reg = PCA9532_REG_LS0;
chris	0:7993a61d8c59	144	} else if ( (led > 3) && (led < 8) ) {
chris	0:7993a61d8c59	145	reg = PCA9532_REG_LS1;
chris	0:7993a61d8c59	146	} else if ( (led > 7) && (led < 12) ) {
chris	0:7993a61d8c59	147	reg = PCA9532_REG_LS2;
chris	0:7993a61d8c59	148	} else if ( (led > 11) && (led < 16) ) {
chris	0:7993a61d8c59	149	reg = PCA9532_REG_LS3;
chris	0:7993a61d8c59	150	} else {
chris	0:7993a61d8c59	151	return(1);
chris	0:7993a61d8c59	152	}
chris	0:7993a61d8c59	153
chris	0:7993a61d8c59	154	// read the current status of the register
chris	0:7993a61d8c59	155	char regval = _read(reg);
chris	0:7993a61d8c59	156
chris	0:7993a61d8c59	157	// clear the two bit slice at the calculated offset
chris	0:7993a61d8c59	158	regval &= ~(0x3 << (2 * offset));
chris	0:7993a61d8c59	159
chris	0:7993a61d8c59	160	// now OR in the mode, shifted by 2*offset
chris	0:7993a61d8c59	161	regval \|= (mode << (2 * offset));
chris	0:7993a61d8c59	162
chris	0:7993a61d8c59	163	// write the new value back
chris	0:7993a61d8c59	164	_write(reg, regval);
chris	0:7993a61d8c59	165
chris	0:7993a61d8c59	166	return(0);
chris	0:7993a61d8c59	167	}
chris	0:7993a61d8c59	168
chris	0:7993a61d8c59	169
chris	0:7993a61d8c59	170
chris	0:7993a61d8c59	171	// private functions for low level IO
chris	0:7993a61d8c59	172
chris	0:7993a61d8c59	173	void PCA9532::_write(int reg, int data) {
chris	0:7993a61d8c59	174	char args[2];
chris	0:7993a61d8c59	175	args[0] = reg;
chris	0:7993a61d8c59	176	args[1] = data;
chris	0:7993a61d8c59	177	_i2c.write(_addr, args,2);
chris	0:7993a61d8c59	178	}
chris	0:7993a61d8c59	179
chris	0:7993a61d8c59	180	int PCA9532::_read(int reg) {
chris	0:7993a61d8c59	181	char args[2];
chris	0:7993a61d8c59	182	args[0] = reg;
chris	0:7993a61d8c59	183	_i2c.write(_addr, args, 1);
chris	0:7993a61d8c59	184	_i2c.read(_addr, args, 1);
chris	0:7993a61d8c59	185	return(args[0]);
chris	0:7993a61d8c59	186	}
chris	0:7993a61d8c59	187
chris	0:7993a61d8c59	188
chris	0:7993a61d8c59	189
chris	0:7993a61d8c59	190
chris	0:7993a61d8c59	191

Repository toolbox

Export to desktop IDE

Build repository

Repository details

Type:	Program
Created:	07 May 2010
Imports:	7
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	2

PCA9532.cpp@0:7993a61d8c59, 2010-05-07 (annotated)

Who changed what in which revision?

Repository toolbox

Repository details

Important Information for this Arm website

Access Warning