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samples: an app to use the APDS9960 RGB and Gesture sensor

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This adds an app to get the RGBC values from the APDS9960 sensor,
and drives one APA102C with those values. The app works on the ARC
side of Arduino 101.

Change-Id: Iaee7bd11c06b03cf3c69f8ccb84cdb649634bb6c
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2016-03-04 14:40:08 -08:00 • committed by Gerrit Code Review
commit 10e64e4457
5 changed files with 304 additions and 0 deletions
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6
samples/drivers/sensor_apds9960/Makefile Normal file
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BOARD ?= arduino_101_sss
KERNEL_TYPE ?= nano
CONF_FILE = prj_$(ARCH).conf
include ${ZEPHYR_BASE}/Makefile.inc

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samples/drivers/sensor_apds9960/prj_arc.conf Normal file
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CONFIG_STDOUT_CONSOLE=y
CONFIG_PRINTK=y
CONFIG_GPIO=y
CONFIG_GPIO_DW=y
CONFIG_GPIO_DW_0=y
CONFIG_GPIO_DW_0_BITS=8
CONFIG_I2C=y
CONFIG_I2C_QUARK_SE_SS_0_DEFAULT_CFG=0x14

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samples/drivers/sensor_apds9960/src/Makefile Normal file
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obj-y = main.o

283
samples/drivers/sensor_apds9960/src/main.c Normal file
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/*
* Copyright (c) 2016 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file Sample app to utilize APDS-9960 Sensor on Arduino 101 (ARC).
*
* The SparkFun RGB and Gesture Sensor was being used:
* https://www.sparkfun.com/products/12787
*
* This sample app is to read RGB value from the APDS-9960 sensor
* and to display the color through the APA102C LED.
*
* For APA102C, on ARC side of Arduino 101:
* 1. GPIO_SS_2 is on AD0 (for APA102C data)
* 2. GPIO_SS_3 is on AD1 (for APA102C clock)
*
* The gpio_dw driver is being used for bit-banging to control
* the APA102C LED..
*
* The APA102/C requires 5V data and clock signals, so logic
* level shifter (preferred) or pull-up resistors are needed.
* Make sure the pins are 5V tolerant if using pull-up
* resistors.
*
* WARNING: the APA102C are very bright even at low settings.
* Protect your eyes and do not look directly into those LEDs.
*/
#include <zephyr.h>
#if defined(CONFIG_STDOUT_CONSOLE)
#include <stdio.h>
#define PRINT printf
#else
#include <misc/printk.h>
#define PRINT printk
#endif
#include <device.h>
#include <gpio.h>
#include <i2c.h>
#include <sys_clock.h>
#include <misc/util.h>
#define SLEEP_MSEC 200
#define GPIO_DATA_PIN 2
#define GPIO_CLK_PIN 3
#define GPIO_NAME "GPIO_SS_"
#define GPIO_DRV_NAME CONFIG_GPIO_DW_0_NAME
#define APA102C_START_FRAME 0x00000000
#define APA102C_END_FRAME 0xFFFFFFFF
#define APA102C_BRIGHTNESS 0xE2000000
#define APA102C_BRIGHTNESS_MASK 0xFF000000
#define I2C_DRV_NAME "I2C0"
#define APDS9960_ADDR 0x39
union rgbc_t {
uint8_t raw[8];
struct {
uint8_t cdatal;
uint8_t cdatah;
uint8_t rdatal;
uint8_t rdatah;
uint8_t gdatal;
uint8_t gdatah;
uint8_t bdatal;
uint8_t bdatah;
} ch;
};
void apa102c_rgb_send(struct device *gpio_dev, uint32_t rgb)
{
int i;
for (i = 0; i < 32; i++) {
/* MSB goes in first */
gpio_pin_write(gpio_dev, GPIO_DATA_PIN, !!(rgb & 0x80000000));
/* Latch data into LED */
gpio_pin_write(gpio_dev, GPIO_CLK_PIN, 1);
gpio_pin_write(gpio_dev, GPIO_CLK_PIN, 0);
rgb <<= 1;
}
}
void apa102c_led_program(struct device *gpio_dev, uint32_t rgb)
{
apa102c_rgb_send(gpio_dev, APA102C_START_FRAME);
apa102c_rgb_send(gpio_dev, rgb);
apa102c_rgb_send(gpio_dev, APA102C_END_FRAME);
}
void apds9960_reg_write(struct device *i2c_dev,
uint8_t reg_addr, uint8_t reg_val)
{
struct i2c_msg msg;
uint8_t data[2];
int ret;
msg.buf = data;
msg.flags = I2C_MSG_WRITE | I2C_MSG_STOP;
/* Enable Power (PON) so we can configure the sensor */
data[0] = reg_addr;
data[1] = reg_val;
msg.len = 2;
ret = i2c_transfer(i2c_dev, &msg, 1, APDS9960_ADDR);
if (ret) {
PRINT("Cannot write APDS9960 reg 0x%X to 0x%X\n",
reg_addr, reg_val);
while (ret) {
/* spin if error */
}
}
}
void apds9960_reg_read(struct device *i2c_dev, uint8_t reg_addr,
uint8_t *data, uint8_t data_len)
{
struct i2c_msg msgs[2];
uint8_t reg_data;
int ret;
/* Access RGBC data register */
reg_data = reg_addr;
msgs[0].buf = &reg_data;
msgs[0].len = 1;
msgs[0].flags = I2C_MSG_WRITE;
/* Read 8 bytes of RGBC values */
msgs[1].buf = data;
msgs[1].len = data_len;
msgs[1].flags = I2C_MSG_READ | I2C_MSG_RESTART | I2C_MSG_STOP;
ret = i2c_transfer(i2c_dev, msgs, 2, APDS9960_ADDR);
if (ret) {
PRINT("Cannot read from APDS9960 reg 0x%X\n", reg_addr);
while (ret) {
/* spin if error */
}
}
}
void apds9960_setup(struct device *i2c_dev, int gain)
{
/* Enable Power (PON) so we can configure the sensor */
apds9960_reg_write(i2c_dev, 0x80, 0x01);
/* Max out the ADC values.
* So every ADC cycle is 200ms, and max
* ADC value is 65535.
*/
apds9960_reg_write(i2c_dev, 0x81, 0xB6);
/* ALS LEDs Gain */
apds9960_reg_write(i2c_dev, 0x8F, (gain & 0x03));
/* Enable Power (PON) and ALS*/
apds9960_reg_write(i2c_dev, 0x80, 0x03);
}
void apds9960_als_valid_wait(struct device *i2c_dev)
{
uint8_t status;
while (1) {
apds9960_reg_read(i2c_dev, 0x93, &status, 1);
if (status & BIT(0)) {
break;
}
sys_thread_busy_wait(5 * USEC_PER_MSEC);
}
}
void main(void)
{
struct device *gpio_dev, *i2c_dev;
int ret;
union rgbc_t rgbc;
int led_rgb;
int als_gain = 0;
gpio_dev = device_get_binding(GPIO_DRV_NAME);
if (!gpio_dev) {
PRINT("Cannot find %s!\n", GPIO_DRV_NAME);
while (!gpio_dev) {
/* spin if error */
};
}
i2c_dev = device_get_binding(I2C_DRV_NAME);
if (!i2c_dev) {
PRINT("Cannot find %s!\n", I2C_DRV_NAME);
while (!i2c_dev) {
/* spin if error */
};
}
/*
* Setup GPIO outputs
*/
ret = gpio_pin_configure(gpio_dev, GPIO_DATA_PIN, (GPIO_DIR_OUT));
if (ret) {
PRINT("Error configuring " GPIO_NAME "%d!\n", GPIO_DATA_PIN);
}
ret = gpio_pin_configure(gpio_dev, GPIO_CLK_PIN, (GPIO_DIR_OUT));
if (ret) {
PRINT("Error configuring " GPIO_NAME "%d!\n", GPIO_CLK_PIN);
}
/*
* Initialize the APDS9960 sensor with 1x ALS gain
*/
apds9960_setup(i2c_dev, als_gain);
while (1) {
apds9960_als_valid_wait(i2c_dev);
apds9960_reg_read(i2c_dev, 0x94, (uint8_t *)&rgbc, 8);
/* Change the gain if it is too bright or too dark.
* Note there is no logic to prevent it from
* bouncing between two gain settings.
*/
if ((rgbc.ch.cdatah < 0x10) && (als_gain != 3)) {
/* More gain if too dark */
als_gain++;
if (als_gain > 3) {
als_gain = 3;
}
apds9960_setup(i2c_dev, als_gain);
PRINT("GAIN ==> %d\n", als_gain);
} else if ((rgbc.ch.cdatah > 0xEF) && (als_gain != 0)) {
/* Less gain if too bright */
als_gain--;
if (als_gain < 0) {
als_gain = 0;
}
apds9960_setup(i2c_dev, als_gain);
PRINT("GAIN ==> %d\n", als_gain);
} else {
/* Only program the LED when gain settles.
* Or else the LED would suddenly go all
* bright or dark before settling to
* the final value.
*/
led_rgb = (rgbc.ch.bdatah << 16)
+ (rgbc.ch.gdatah << 8)
+ (rgbc.ch.rdatah)
+ APA102C_BRIGHTNESS;
apa102c_led_program(gpio_dev, led_rgb);
}
}
}

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samples/drivers/sensor_apds9960/testcase.ini Normal file
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[test]
build_only = true
tags = samples
arch_whitelist = arc
platform_whitelist = arduino_101_sss