EA_PCA9532_Example - Example of PCA9532 being used on the Embedded Art…

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Chris Styles / Mbed 2 deprecated EA_PCA9532_Example

Example of PCA9532 being used on the Embedded Artists Baseboard, this time fading up LEDs using PWM

PCA9532.cpp@0:0df46cf615c3, 2010-05-07 (annotated)

Committer:: chris
Date:: Fri May 07 12:41:06 2010 +0000
Revision:: 0:0df46cf615c3

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User	Revision	Line number	New contents of line
chris	0:0df46cf615c3	1	/* mbed PCF9532 LED Driver Library
chris	0:0df46cf615c3	2	*
chris	0:0df46cf615c3	3	* Copyright (c) 2010, cstyles (http://mbed.org)
chris	0:0df46cf615c3	4	*
chris	0:0df46cf615c3	5	* Permission is hereby granted, free of charge, to any person obtaining a copy
chris	0:0df46cf615c3	6	* of this software and associated documentation files (the "Software"), to deal
chris	0:0df46cf615c3	7	* in the Software without restriction, including without limitation the rights
chris	0:0df46cf615c3	8	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
chris	0:0df46cf615c3	9	* copies of the Software, and to permit persons to whom the Software is
chris	0:0df46cf615c3	10	* furnished to do so, subject to the following conditions:
chris	0:0df46cf615c3	11	*
chris	0:0df46cf615c3	12	* The above copyright notice and this permission notice shall be included in
chris	0:0df46cf615c3	13	* all copies or substantial portions of the Software.
chris	0:0df46cf615c3	14	*
chris	0:0df46cf615c3	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
chris	0:0df46cf615c3	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
chris	0:0df46cf615c3	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
chris	0:0df46cf615c3	18	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
chris	0:0df46cf615c3	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
chris	0:0df46cf615c3	20	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
chris	0:0df46cf615c3	21	* THE SOFTWARE.
chris	0:0df46cf615c3	22	*/
chris	0:0df46cf615c3	23
chris	0:0df46cf615c3	24
chris	0:0df46cf615c3	25	#include "PCA9532.h"
chris	0:0df46cf615c3	26	#include "mbed.h"
chris	0:0df46cf615c3	27
chris	0:0df46cf615c3	28	/*
chris	0:0df46cf615c3	29	Constructor, pin names for I2C and the I2C addrss of the device
chris	0:0df46cf615c3	30	*/
chris	0:0df46cf615c3	31	PCA9532::PCA9532(PinName scl, PinName sda, int addr)
chris	0:0df46cf615c3	32	: _i2c(scl, sda) {
chris	0:0df46cf615c3	33
chris	0:0df46cf615c3	34	_i2c.frequency(1000000);
chris	0:0df46cf615c3	35
chris	0:0df46cf615c3	36	_addr = addr;
chris	0:0df46cf615c3	37
chris	0:0df46cf615c3	38	}
chris	0:0df46cf615c3	39
chris	0:0df46cf615c3	40
chris	0:0df46cf615c3	41
chris	0:0df46cf615c3	42
chris	0:0df46cf615c3	43
chris	0:0df46cf615c3	44	/*
chris	0:0df46cf615c3	45	Set the period
chris	0:0df46cf615c3	46	*/
chris	0:0df46cf615c3	47	int PCA9532::Period (int channel, float period) {
chris	0:0df46cf615c3	48
chris	0:0df46cf615c3	49	char reg = 0;
chris	0:0df46cf615c3	50
chris	0:0df46cf615c3	51	if (channel == 0) {
chris	0:0df46cf615c3	52	reg = PCA9532_REG_PSC0;
chris	0:0df46cf615c3	53	} else if (channel == 1) {
chris	0:0df46cf615c3	54	reg = PCA9532_REG_PSC1;
chris	0:0df46cf615c3	55	} else {
chris	0:0df46cf615c3	56	return (1);
chris	0:0df46cf615c3	57	}
chris	0:0df46cf615c3	58
chris	0:0df46cf615c3	59	if (period > 1.0) {
chris	0:0df46cf615c3	60	period = 255;
chris	0:0df46cf615c3	61	} else if ( period < 0.0 ) {
chris	0:0df46cf615c3	62	period = 0;
chris	0:0df46cf615c3	63	} else {
chris	0:0df46cf615c3	64	period = 256 * period;
chris	0:0df46cf615c3	65	}
chris	0:0df46cf615c3	66
chris	0:0df46cf615c3	67	_write(reg, period);
chris	0:0df46cf615c3	68	return(0);
chris	0:0df46cf615c3	69
chris	0:0df46cf615c3	70	}
chris	0:0df46cf615c3	71
chris	0:0df46cf615c3	72
chris	0:0df46cf615c3	73	/*
chris	0:0df46cf615c3	74	Set the duty cycle
chris	0:0df46cf615c3	75	*/
chris	0:0df46cf615c3	76	int PCA9532::Duty (int channel, float d) {
chris	0:0df46cf615c3	77
chris	0:0df46cf615c3	78	char duty = 0;
chris	0:0df46cf615c3	79	char reg = 0;
chris	0:0df46cf615c3	80
chris	0:0df46cf615c3	81	if (channel == 0) {
chris	0:0df46cf615c3	82	reg = PCA9532_REG_PWM0;
chris	0:0df46cf615c3	83	} else if (channel == 1) {
chris	0:0df46cf615c3	84	reg = PCA9532_REG_PWM1;
chris	0:0df46cf615c3	85	} else {
chris	0:0df46cf615c3	86	return (1);
chris	0:0df46cf615c3	87	}
chris	0:0df46cf615c3	88
chris	0:0df46cf615c3	89	if (d > 1.0) {
chris	0:0df46cf615c3	90	duty = 255;
chris	0:0df46cf615c3	91	} else if ( d < 0.0 ) {
chris	0:0df46cf615c3	92	duty = 0;
chris	0:0df46cf615c3	93	} else {
chris	0:0df46cf615c3	94	duty = 256 * d;
chris	0:0df46cf615c3	95	}
chris	0:0df46cf615c3	96
chris	0:0df46cf615c3	97	_write(reg, duty);
chris	0:0df46cf615c3	98	return(0);
chris	0:0df46cf615c3	99
chris	0:0df46cf615c3	100	}
chris	0:0df46cf615c3	101
chris	0:0df46cf615c3	102	/*
chris	0:0df46cf615c3	103	Set each of the LEDs in this mask to the give mode
chris	0:0df46cf615c3	104	Loop through the mask calling SetLed on each match
chris	0:0df46cf615c3	105	alt_mode specifies the mode of the non-Matches of SetMode
chris	0:0df46cf615c3	106	*/
chris	0:0df46cf615c3	107	int PCA9532::SetMode (int mask, int mode) {
chris	0:0df46cf615c3	108	if ( (mode < 0) \|\| (mode > 3) ) {
chris	0:0df46cf615c3	109	return(1);
chris	0:0df46cf615c3	110	} else {
chris	0:0df46cf615c3	111	for (int i=0 ; i < 16 ; i++ ) {
chris	0:0df46cf615c3	112
chris	0:0df46cf615c3	113	// if this matches, set the LED to the mode
chris	0:0df46cf615c3	114	if (mask & (0x1 << i)) {
chris	0:0df46cf615c3	115	SetLed(i,mode);
chris	0:0df46cf615c3	116	}
chris	0:0df46cf615c3	117	}
chris	0:0df46cf615c3	118	}
chris	0:0df46cf615c3	119	return(0);
chris	0:0df46cf615c3	120	}
chris	0:0df46cf615c3	121
chris	0:0df46cf615c3	122
chris	0:0df46cf615c3	123
chris	0:0df46cf615c3	124	/*
chris	0:0df46cf615c3	125	led is in the range 0-15
chris	0:0df46cf615c3	126	mode is inthe range 0-3
chris	0:0df46cf615c3	127	*/
chris	0:0df46cf615c3	128	int PCA9532::SetLed(int led, int mode) {
chris	0:0df46cf615c3	129
chris	0:0df46cf615c3	130	int reg = 0;
chris	0:0df46cf615c3	131	int offset = (led % 4);
chris	0:0df46cf615c3	132
chris	0:0df46cf615c3	133	printf("\nSetLed(%d,%d)\n", led, mode);
chris	0:0df46cf615c3	134
chris	0:0df46cf615c3	135	// makesure mode is within bounds
chris	0:0df46cf615c3	136	if ( (mode < 0) \|\| (mode > 3) ) {
chris	0:0df46cf615c3	137	printf("Error : Invalid mode supplied\n");
chris	0:0df46cf615c3	138	return(1);
chris	0:0df46cf615c3	139	}
chris	0:0df46cf615c3	140
chris	0:0df46cf615c3	141	// determine which register this is,
chris	0:0df46cf615c3	142	if (led < 4) {
chris	0:0df46cf615c3	143	reg = PCA9532_REG_LS0;
chris	0:0df46cf615c3	144	} else if ( (led > 3) && (led < 8) ) {
chris	0:0df46cf615c3	145	reg = PCA9532_REG_LS1;
chris	0:0df46cf615c3	146	} else if ( (led > 7) && (led < 12) ) {
chris	0:0df46cf615c3	147	reg = PCA9532_REG_LS2;
chris	0:0df46cf615c3	148	} else if ( (led > 11) && (led < 16) ) {
chris	0:0df46cf615c3	149	reg = PCA9532_REG_LS3;
chris	0:0df46cf615c3	150	} else {
chris	0:0df46cf615c3	151	return(1);
chris	0:0df46cf615c3	152	}
chris	0:0df46cf615c3	153
chris	0:0df46cf615c3	154	// read the current status of the register
chris	0:0df46cf615c3	155	char regval = _read(reg);
chris	0:0df46cf615c3	156
chris	0:0df46cf615c3	157	// clear the two bit slice at the calculated offset
chris	0:0df46cf615c3	158	regval &= ~(0x3 << (2 * offset));
chris	0:0df46cf615c3	159
chris	0:0df46cf615c3	160	// now OR in the mode, shifted by 2*offset
chris	0:0df46cf615c3	161	regval \|= (mode << (2 * offset));
chris	0:0df46cf615c3	162
chris	0:0df46cf615c3	163	// write the new value back
chris	0:0df46cf615c3	164	_write(reg, regval);
chris	0:0df46cf615c3	165
chris	0:0df46cf615c3	166	return(0);
chris	0:0df46cf615c3	167	}
chris	0:0df46cf615c3	168
chris	0:0df46cf615c3	169
chris	0:0df46cf615c3	170
chris	0:0df46cf615c3	171	// private functions for low level IO
chris	0:0df46cf615c3	172
chris	0:0df46cf615c3	173	void PCA9532::_write(int reg, int data) {
chris	0:0df46cf615c3	174	char args[2];
chris	0:0df46cf615c3	175	args[0] = reg;
chris	0:0df46cf615c3	176	args[1] = data;
chris	0:0df46cf615c3	177	_i2c.write(_addr, args,2);
chris	0:0df46cf615c3	178	}
chris	0:0df46cf615c3	179
chris	0:0df46cf615c3	180	int PCA9532::_read(int reg) {
chris	0:0df46cf615c3	181	char args[2];
chris	0:0df46cf615c3	182	args[0] = reg;
chris	0:0df46cf615c3	183	_i2c.write(_addr, args, 1);
chris	0:0df46cf615c3	184	_i2c.read(_addr, args, 1);
chris	0:0df46cf615c3	185	return(args[0]);
chris	0:0df46cf615c3	186	}
chris	0:0df46cf615c3	187
chris	0:0df46cf615c3	188
chris	0:0df46cf615c3	189
chris	0:0df46cf615c3	190
chris	0:0df46cf615c3	191

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	07 May 2010
Imports:	9
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

PCA9532.cpp@0:0df46cf615c3, 2010-05-07 (annotated)

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