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https://github.com/RIOT-OS/RIOT.git
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149 lines
3.6 KiB
C
149 lines
3.6 KiB
C
/*
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* Copyright (C) 2017 OTA keys S.A.
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_adcxx1x
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* @{
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*
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* @file
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* @brief ADCXX1C ADC device driver
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*
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* @author Vincent Dupont <vincent@otakeys.com>
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* @}
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*/
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#include "adcxx1c.h"
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#include "adcxx1c_params.h"
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#include "adcxx1c_regs.h"
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#include "periph/i2c.h"
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#include "periph/gpio.h"
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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#define I2C_SPEED I2C_SPEED_FAST
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#define I2C (dev->params.i2c)
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#define ADDR (dev->params.addr)
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/* Configuration register test value
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* value 0x20: cycle time = Tconvert x 64 */
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#define CONF_TEST_VALUE (0x20)
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int adcxx1c_init(adcxx1c_t *dev, const adcxx1c_params_t *params)
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{
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assert(dev && params);
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dev->params = *params;
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dev->cb = NULL;
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i2c_acquire(I2C);
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if (i2c_init_master(I2C, I2C_SPEED) < 0) {
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i2c_release(I2C);
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DEBUG("[adcxx1c] init - error: unable to initialize I2C bus\n");
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return ADCXX1C_NOI2C;
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}
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uint8_t reg = 0;
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/* Test communication write and read configuration register */
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i2c_write_reg(I2C, ADDR, ADCXX1C_CONF_ADDR, CONF_TEST_VALUE);
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i2c_read_reg(I2C, ADDR, ADCXX1C_CONF_ADDR, ®);
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if (reg != CONF_TEST_VALUE) {
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i2c_release(I2C);
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DEBUG("[adcxx1c] init - error: unable to communicate with the device (reg=%x)\n", reg);
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return ADCXX1C_NODEV;
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}
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reg = dev->params.cycle << 5;
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i2c_write_reg(I2C, ADDR, ADCXX1C_CONF_ADDR, reg);
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i2c_release(I2C);
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adcxx1c_set_alert_parameters(dev, dev->params.low_limit,
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dev->params.high_limit,
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dev->params.hysteresis);
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return ADCXX1C_OK;
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}
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int adcxx1c_read_raw(const adcxx1c_t *dev, int16_t *raw)
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{
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uint8_t buf[2];
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int status;
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i2c_acquire(I2C);
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status = i2c_read_regs(I2C, ADDR, ADCXX1C_CONV_RES_ADDR, buf, 2);
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i2c_release(I2C);
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if (status < 2) {
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return ADCXX1C_NOI2C;
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}
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*raw = ((buf[0] & 0x0F) << 8 | buf[1]) >> (12 - dev->params.bits);
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return ADCXX1C_OK;
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}
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static void _alert_cb(void *arg)
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{
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adcxx1c_t *dev = arg;
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if (dev->cb) {
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dev->cb(dev->arg);
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}
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}
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int adcxx1c_enable_alert(adcxx1c_t *dev, adcxx1c_cb_t cb, void *arg)
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{
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uint8_t reg;
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i2c_acquire(I2C);
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i2c_read_reg(I2C, ADDR, ADCXX1C_CONF_ADDR, ®);
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reg |= (dev->params.alert_pin != GPIO_UNDEF ? ADCXX1C_CONF_ALERT_PIN_EN : 0)
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| ADCXX1C_CONF_ALERT_FLAG_EN;
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i2c_write_reg(I2C, ADDR, ADCXX1C_CONF_ADDR, reg);
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i2c_release(I2C);
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if (dev->params.alert_pin != GPIO_UNDEF) {
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dev->cb = cb;
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dev->arg = arg;
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/* alert active low */
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gpio_init_int(dev->params.alert_pin, GPIO_IN, GPIO_FALLING, _alert_cb, dev);
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}
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return ADCXX1C_OK;
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}
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int adcxx1c_set_alert_parameters(const adcxx1c_t *dev, int16_t low_limit,
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int16_t high_limit, int16_t hysteresis)
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{
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uint8_t buf[2];
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i2c_acquire(I2C);
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low_limit <<= (12 - dev->params.bits);
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buf[0] = low_limit >> 8;
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buf[1] = low_limit & 0xFF;
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i2c_write_regs(I2C, ADDR, ADCXX1C_LOW_LIMIT_ADDR, buf, 2);
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high_limit <<= (12 - dev->params.bits);
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buf[0] = high_limit >> 8;
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buf[1] = high_limit & 0xFF;
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i2c_write_regs(I2C, ADDR, ADCXX1C_HIGH_LIMIT_ADDR, buf, 2);
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hysteresis <<= (12 - dev->params.bits);
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buf[0] = hysteresis >> 8;
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buf[1] = hysteresis & 0xFF;
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i2c_write_regs(I2C, ADDR, ADCXX1C_HYSTERESIS_ADDR, buf, 2);
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i2c_release(I2C);
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return ADCXX1C_OK;
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}
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