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osd-contiki/platform/zoul/dev/tsl256x.c

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/*
* Copyright (c) 2015, Zolertia - http://www.zolertia.com
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
*
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup zoul-tsl256x-sensor
* @{
*
* \file
* Driver for the external TSL256X light sensor
*
* \author
* Antonio Lignan <alinan@zolertia.com>
* Toni Lozano <tlozano@zolertia.com>
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "dev/i2c.h"
#include "dev/gpio.h"
#include "dev/zoul-sensors.h"
#include "lib/sensors.h"
#include "tsl256x.h"
/*---------------------------------------------------------------------------*/
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
#define TSL256X_INT_PORT_BASE GPIO_PORT_TO_BASE(I2C_INT_PORT)
#define TSL256X_INT_PIN_MASK GPIO_PIN_MASK(I2C_INT_PIN)
/*---------------------------------------------------------------------------*/
static uint8_t enabled;
static uint8_t gain;
static uint8_t timming;
/*---------------------------------------------------------------------------*/
void (*tsl256x_int_callback)(uint8_t value);
/*---------------------------------------------------------------------------*/
static uint16_t
calculate_lux(uint8_t *buf)
{
uint32_t ch0, ch1, chscale = 0;
uint32_t ratio = 0;
uint32_t lratio, tmp = 0;
uint16_t buffer[2];
/* The calculations below assume the integration time is 402ms and the gain
* is 16x (nominal), if not then it is required to normalize the reading
* before converting to lux
*/
buffer[0] = (buf[1] << 8 | (buf[0]));
buffer[1] = (buf[3] << 8 | (buf[2]));
switch(timming) {
case TSL256X_TIMMING_INTEG_402MS:
chscale = (1 << CH_SCALE);
break;
case TSL256X_TIMMING_INTEG_101MS:
chscale = CHSCALE_TINT1;
break;
case TSL256X_TIMMING_INTEG_13_7MS:
chscale = CHSCALE_TINT0;
break;
}
if(!gain) {
chscale = chscale << 4;
}
ch0 = (buffer[0] * chscale) >> CH_SCALE;
ch1 = (buffer[1] * chscale) >> CH_SCALE;
if(ch0 > 0) {
ratio = (ch1 << CH_SCALE);
ratio = ratio / ch0;
}
lratio = (ratio + 1) >> 1;
if((lratio >= 0) && (lratio <= K1T)) {
tmp = (ch0 * B1T) - (ch1 * M1T);
} else if(lratio <= K2T) {
tmp = (ch0 * B2T) - (ch1 * M2T);
} else if(lratio <= K3T) {
tmp = (ch0 * B3T) - (ch1 * M3T);
} else if(lratio <= K4T) {
tmp = (ch0 * B4T) - (ch1 * M4T);
} else if(lratio <= K5T) {
tmp = (ch0 * B5T) - (ch1 * M5T);
} else if(lratio <= K6T) {
tmp = (ch0 * B6T) - (ch1 * M6T);
} else if(lratio <= K7T) {
tmp = (ch0 * B7T) - (ch1 * M7T);
} else if(lratio > K8T) {
tmp = (ch0 * B8T) - (ch1 * M8T);
}
if(tmp < 0) {
tmp = 0;
}
tmp += (1 << (LUX_SCALE - 1));
return tmp >> LUX_SCALE;
}
/*---------------------------------------------------------------------------*/
static int
tsl256x_read_reg(uint8_t reg, uint8_t *buf, uint8_t regNum)
{
i2c_master_enable();
if(i2c_single_send(TSL256X_ADDR, reg) == I2C_MASTER_ERR_NONE) {
while(i2c_master_busy());
if(i2c_burst_receive(TSL256X_ADDR, buf, regNum) == I2C_MASTER_ERR_NONE) {
return TSL256X_SUCCESS;
}
}
return TSL256X_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
tsl256x_write_reg(uint8_t *buf, uint8_t num)
{
if((buf == NULL) || (num <= 0)) {
PRINTF("TSL256X: invalid write values\n");
return TSL256X_ERROR;
}
i2c_master_enable();
if(i2c_burst_send(TSL256X_ADDR, buf, num) == I2C_MASTER_ERR_NONE) {
return TSL256X_SUCCESS;
}
return TSL256X_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
tsl256x_on(void)
{
uint8_t buf[2];
buf[0] = (TSL256X_COMMAND + TSL256X_CONTROL);
buf[1] = TSL256X_CONTROL_POWER_ON;
if(tsl256x_write_reg(buf, 2) == I2C_MASTER_ERR_NONE) {
if(i2c_single_receive(TSL256X_ADDR, &buf[0]) == I2C_MASTER_ERR_NONE) {
if((buf[0] & 0x0F) == TSL256X_CONTROL_POWER_ON) {
PRINTF("TSL256X: powered on\n");
return TSL256X_SUCCESS;
}
}
}
PRINTF("TSL256X: failed to power on\n");
return TSL256X_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
tsl256x_id_register(uint8_t *buf)
{
if(tsl256x_read_reg((TSL256X_COMMAND + TSL256X_ID_REG),
buf, 1) == TSL256X_SUCCESS) {
PRINTF("TSL256X: partnum/revnum 0x%02X\n", *buf);
return TSL256X_SUCCESS;
}
return TSL256X_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
tsl256x_off(void)
{
uint8_t buf[2];
buf[0] = (TSL256X_COMMAND + TSL256X_CONTROL);
buf[1] = TSL256X_CONTROL_POWER_OFF;
if(tsl256x_write_reg(buf, 2) == I2C_MASTER_ERR_NONE) {
PRINTF("TSL256X: powered off\n");
return TSL256X_SUCCESS;
}
PRINTF("TSL256X: failed to power off\n");
return TSL256X_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
tsl256x_clear_interrupt(void)
{
uint8_t buf = (TSL256X_COMMAND + TSL256X_CLEAR_INTERRUPT);
if(tsl256x_write_reg(&buf, 1) != I2C_MASTER_ERR_NONE) {
PRINTF("TSL256X: failed to clear the interrupt\n");
return TSL256X_ERROR;
}
return TSL256X_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static int
tsl256x_read_sensor(uint16_t *lux)
{
uint8_t buf[4];
/* This is hardcoded to use word write/read operations */
if(tsl256x_read_reg((TSL256X_COMMAND + TSL256X_D0LOW),
&buf[0], 2) == TSL256X_SUCCESS) {
if(tsl256x_read_reg((TSL256X_COMMAND + TSL256X_D1LOW),
&buf[2], 2) == TSL256X_SUCCESS) {
PRINTF("TSL256X: CH0 0x%02X%02X CH1 0x%02X%02X\n", buf[1], buf[0],
buf[3], buf[2]);
*lux = calculate_lux(buf);
return TSL256X_SUCCESS;
}
}
PRINTF("TSL256X: failed to read\n");
return TSL256X_ERROR;
}
/*---------------------------------------------------------------------------*/
PROCESS(tsl256x_int_process, "TSL256X interrupt process handler");
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(tsl256x_int_process, ev, data)
{
PROCESS_EXITHANDLER();
PROCESS_BEGIN();
while(1) {
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
tsl256x_clear_interrupt();
tsl256x_int_callback(0);
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static void
tsl256x_interrupt_handler(uint8_t port, uint8_t pin)
{
/* There's no alert/interruption flag to check, clear the interruption by
* writting to the CLEAR bit in the COMMAND register
*/
process_poll(&tsl256x_int_process);
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
uint8_t buf[3];
if((type != TSL256X_ACTIVE) && (type != TSL256X_INT_OVER) &&
(type != TSL256X_INT_BELOW) && (type != TSL256X_INT_DISABLE) &&
(type != TSL256X_TIMMING_CFG)) {
PRINTF("TSL256X: invalid start value\n");
return TSL256X_ERROR;
}
/* As default the power-on values of the sensor are gain 1X, 402ms integration
* time (not nominal), with manual control disabled
*/
if(type == TSL256X_ACTIVE) {
if(value) {
i2c_init(I2C_SDA_PORT, I2C_SDA_PIN, I2C_SCL_PORT, I2C_SCL_PIN,
I2C_SCL_NORMAL_BUS_SPEED);
/* Initialize interrupts handlers */
tsl256x_int_callback = NULL;
/* Power on the sensor and check for the part number */
if(tsl256x_on() == TSL256X_SUCCESS) {
if(tsl256x_id_register(&buf[0]) == TSL256X_SUCCESS) {
if((buf[0] & TSL256X_ID_PARTNO_MASK) == TSL256X_EXPECTED_PARTNO) {
/* Read the timming/gain configuration */
if(tsl256x_read_reg((TSL256X_COMMAND + TSL256X_TIMMING),
&buf[0], 1) == TSL256X_SUCCESS) {
gain = buf[0] & TSL256X_TIMMING_GAIN;
timming = buf[0] & TSL256X_TIMMING_INTEG_MASK;
PRINTF("TSL256X: enabled, timming %u gain %u\n", timming, gain);
/* Restart the over interrupt threshold */
buf[0] = (TSL256X_COMMAND + TSL256X_THRHIGHLOW);
buf[1] = 0xFF;
buf[2] = 0xFF;
if(tsl256x_write_reg(buf, 3) != TSL256X_SUCCESS) {
PRINTF("TSL256X: failed to clear over interrupt\n");
return TSL256X_ERROR;
}
/* Restart the below interrupt threshold */
buf[0] = (TSL256X_COMMAND + TSL256X_THRLOWLOW);
buf[1] = 0x00;
buf[2] = 0x00;
if(tsl256x_write_reg(buf, 3) != TSL256X_SUCCESS) {
PRINTF("TSL256X: failed to clear below interrupt\n");
return TSL256X_ERROR;
}
/* Clear any pending interrupt */
if(tsl256x_clear_interrupt() == TSL256X_SUCCESS) {
enabled = 1;
return TSL256X_SUCCESS;
}
}
}
}
}
return TSL256X_ERROR;
} else {
if(tsl256x_off() == TSL256X_SUCCESS) {
PRINTF("TSL256X: stopped\n");
enabled = 0;
return TSL256X_SUCCESS;
}
return TSL256X_ERROR;
}
}
if(!enabled) {
PRINTF("TSL256X: sensor not started\n");
return TSL256X_ERROR;
}
if(type == TSL256X_INT_DISABLE) {
/* Ensure the GPIO doesn't generate more interrupts, this may affect others
* I2C digital sensors using the bus and sharing this pin, so an user may
* comment the line below
*/
GPIO_DISABLE_INTERRUPT(TSL256X_INT_PORT_BASE, TSL256X_INT_PIN_MASK);
/* This also wipes out the persistance value, to be reconfigured when
* enabling back the interruption
*/
buf[0] = (TSL256X_COMMAND + TSL256X_INTERRUPT);
buf[1] = TSL256X_INTR_DISABLED;
if(tsl256x_write_reg(buf, 2) != TSL256X_SUCCESS) {
PRINTF("TSL256X: failed to disable the interrupt\n");
return TSL256X_ERROR;
}
return TSL256X_SUCCESS;
}
/* Configure the timming and gain */
if(type == TSL256X_TIMMING_CFG) {
if((value != TSL256X_G16X_402MS) && (value != TSL256X_G1X_402MS) &&
(value != TSL256X_G1X_101MS) && (value != TSL256X_G1X_13_7MS)) {
PRINTF("TSL256X: invalid timming configuration values\n");
return TSL256X_ERROR;
}
buf[0] = (TSL256X_COMMAND + TSL256X_TIMMING);
buf[1] = value;
if(tsl256x_write_reg(buf, 2) == TSL256X_SUCCESS) {
if(value == TSL256X_G16X_402MS) {
gain = 1;
}
switch(value) {
case TSL256X_G16X_402MS:
case TSL256X_G1X_402MS:
timming = TSL256X_TIMMING_INTEG_402MS;
break;
case TSL256X_G1X_101MS:
timming = TSL256X_TIMMING_INTEG_101MS;
break;
case TSL256X_G1X_13_7MS:
timming = TSL256X_TIMMING_INTEG_13_7MS;
break;
}
PRINTF("TSL256X: new timming %u gain %u\n", timming, gain);
return TSL256X_SUCCESS;
}
PRINTF("TSL256X: failed to configure timming\n");
return TSL256X_ERROR;
}
/* From here we handle the interrupt configuration, it requires the interrupt
* callback handler to have been previously set using the TSL256X_REGISTER_INT
* macro
*/
buf[1] = ((uint8_t *)&value)[0];
buf[2] = ((uint8_t *)&value)[1];
if(type == TSL256X_INT_OVER) {
buf[0] = (TSL256X_COMMAND + TSL256X_THRHIGHLOW);
} else if(type == TSL256X_INT_BELOW) {
buf[0] = (TSL256X_COMMAND + TSL256X_THRLOWLOW);
}
if(tsl256x_write_reg(buf, 3) != TSL256X_SUCCESS) {
PRINTF("TSL256X: failed to set interrupt level\n");
return TSL256X_ERROR;
}
/* Now configure the interruption register (level interrupt, 2 integration
* cycles after threshold has been reached (roughly 804ms if timming is 402ms)
*/
buf[0] = (TSL256X_COMMAND + TSL256X_INTERRUPT);
buf[1] = (TSL256X_INTR_LEVEL << TSL256X_INTR_SHIFT);
buf[1] += TSL256X_INT_PERSIST_2_CYCLES;
if(tsl256x_write_reg(buf, 2) != TSL256X_SUCCESS) {
PRINTF("TSL256X: failed to enable interrupt\n");
return TSL256X_ERROR;
}
/* Configure the interrupts pins */
GPIO_SOFTWARE_CONTROL(TSL256X_INT_PORT_BASE, TSL256X_INT_PIN_MASK);
GPIO_SET_INPUT(TSL256X_INT_PORT_BASE, TSL256X_INT_PIN_MASK);
/* Pull-up resistor, detect falling edge */
GPIO_DETECT_EDGE(TSL256X_INT_PORT_BASE, TSL256X_INT_PIN_MASK);
GPIO_TRIGGER_SINGLE_EDGE(TSL256X_INT_PORT_BASE, TSL256X_INT_PIN_MASK);
GPIO_DETECT_FALLING(TSL256X_INT_PORT_BASE, TSL256X_INT_PIN_MASK);
gpio_register_callback(tsl256x_interrupt_handler, I2C_INT_PORT, I2C_INT_PIN);
/* Spin process until an interrupt is received */
process_start(&tsl256x_int_process, NULL);
/* Enable interrupts */
GPIO_ENABLE_INTERRUPT(TSL256X_INT_PORT_BASE, TSL256X_INT_PIN_MASK);
/* The RE-Mote revision A has this pin shared and with a pull-down resistor,
* for other platforms (like the firefly), change to enable pull-up internal
* resistor instead if no external pull-up is present.
*/
ioc_set_over(I2C_INT_PORT, I2C_INT_PIN, IOC_OVERRIDE_PUE);
nvic_interrupt_enable(I2C_INT_VECTOR);
PRINTF("TSL256X: Interrupt configured\n");
return TSL256X_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch(type) {
case SENSORS_ACTIVE:
case SENSORS_READY:
return enabled;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
uint16_t lux;
if(!enabled) {
PRINTF("TSL256X: sensor not started\n");
return TSL256X_ERROR;
}
if(type == TSL256X_VAL_READ) {
if(tsl256x_read_sensor(&lux) != TSL256X_ERROR) {
return lux;
}
PRINTF("TSL256X: fail to read\n");
}
return TSL256X_ERROR;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(tsl256x, TSL256X_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/
/** @} */
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