contiki/platform/z1/dev/tlc59116.c
2014-10-20 10:28:00 +02:00

186 lines
5.6 KiB
C

/*
* Copyright (c) 2013, Jelmer Tiete.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Device drivers for tlc59116 i2c led driver on Zolertia Z1.
* See http://www.ti.com/product/tlc59116 for datasheet.
* \author
* Jelmer Tiete, VUB <jelmer@tiete.be>
*/
#include <stdio.h>
#include "contiki.h"
#include "tlc59116.h"
#include "i2cmaster.h"
/*---------------------------------------------------------------------------*/
/* Write to a register.
* args:
* reg register to write to
* val value to write
*/
void
tlc59116_write_reg(uint8_t reg, uint8_t val)
{
uint8_t tx_buf[] = { reg, val };
i2c_transmitinit(TLC59116_ADDR);
while(i2c_busy());
PRINTFDEBUG("I2C Ready to TX\n");
i2c_transmit_n(2, tx_buf);
while(i2c_busy());
PRINTFDEBUG("WRITE_REG 0x%02X @ reg 0x%02X\n", val, reg);
}
/*---------------------------------------------------------------------------*/
/* Write several registers from a stream.
* args:
* len number of bytes to write
* data pointer to where the data is written from
*
* First byte in stream must be the register address to begin writing to.
* The data is then written from second byte and increasing.
*/
void
tlc59116_write_stream(uint8_t len, uint8_t *data)
{
i2c_transmitinit(TLC59116_ADDR);
while(i2c_busy());
PRINTFDEBUG("I2C Ready to TX(stream)\n");
i2c_transmit_n(len, data); /* start tx and send conf reg */
while(i2c_busy());
PRINTFDEBUG("WRITE_STR %u B to 0x%02X\n", len, data[0]);
}
/*---------------------------------------------------------------------------*/
/* Read one register.
* args:
* reg what register to read
* returns the value of the read register
*/
uint8_t
tlc59116_read_reg(uint8_t reg)
{
uint8_t retVal = 0;
uint8_t rtx = reg;
PRINTFDEBUG("READ_REG 0x%02X\n", reg);
/* transmit the register to read */
i2c_transmitinit(TLC59116_ADDR);
while(i2c_busy());
i2c_transmit_n(1, &rtx);
while(i2c_busy());
/* receive the data */
i2c_receiveinit(TLC59116_ADDR);
while(i2c_busy());
i2c_receive_n(1, &retVal);
while(i2c_busy());
return retVal;
}
/*---------------------------------------------------------------------------*/
/* Read several registers in a stream.
* args:
* reg what register to start reading from
* len number of bytes to read
* whereto pointer to where the data is saved
*/
void
tlc59116_read_stream(uint8_t reg, uint8_t len, uint8_t *whereto)
{
uint8_t rtx = reg;
PRINTFDEBUG("READ_STR %u B from 0x%02X\n", len, reg);
/* transmit the register to start reading from */
i2c_transmitinit(TLC59116_ADDR);
while(i2c_busy());
i2c_transmit_n(1, &rtx);
while(i2c_busy());
/* receive the data */
i2c_receiveinit(TLC59116_ADDR);
while(i2c_busy());
i2c_receive_n(len, whereto);
while(i2c_busy());
}
/*---------------------------------------------------------------------------*/
/* Set pwm value for individual led. Make sure PWM mode is enabled.
* args:
* led led output -> 0 till 15
* pwm led pwm value
*/
void
tlc59116_led(uint8_t led, uint8_t pwm)
{
if((led < 0) || (led > 15)) {
PRINTFDEBUG("TLC59116: wrong led value.");
} else {
tlc59116_write_reg(led + TLC59116_PWM0, pwm);
}
}
/*---------------------------------------------------------------------------*/
/* Init the led driver: ports, pins, registers, interrupts (none enabled), I2C,
* default threshold values etc.
*/
void
tlc59116_init(void)
{
/* Set up ports and pins for I2C communication */
i2c_enable();
/* set default register values. */
tlc59116_write_reg(TLC59116_MODE1, TLC59116_MODE1_DEFAULT);
tlc59116_write_reg(TLC59116_MODE2, TLC59116_MODE2_DEFAULT);
/*Set all PWM values to 0x00 (off) */
/*This would maybe be better with a SWRST */
uint8_t tx_buf[] =
{ TLC59116_PWM0_AUTOINCR, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
tlc59116_write_stream(17, tx_buf);
/* set all leds to PWM control */
tlc59116_write_reg(TLC59116_LEDOUT0, TLC59116_LEDOUT_PWM);
tlc59116_write_reg(TLC59116_LEDOUT1, TLC59116_LEDOUT_PWM);
tlc59116_write_reg(TLC59116_LEDOUT2, TLC59116_LEDOUT_PWM);
tlc59116_write_reg(TLC59116_LEDOUT3, TLC59116_LEDOUT_PWM);
}