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Added DAC support to PCF8591 driver

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This commit is contained in:
UncleRus 2017-10-13 00:49:15 +05:00
parent 715bc8148c
commit 60b671ea44
3 changed files with 54 additions and 23 deletions
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39
extras/pcf8591/pcf8591.c
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@ -1,20 +1,41 @@
#include <stddef.h>
#include <stdint.h>
/**
* Driver for 8-bit analog-to-digital conversion and
* an 8-bit digital-to-analog conversion PCF8591
*
* Part of esp-open-rtos
* Copyright (C) 2017 Pham Ngoc Thanh <pnt239@gmail.com>
* 2017 Ruslan V. Uss <unclerus@gmail.com>
* BSD Licensed as described in the file LICENSE
*/
#include "pcf8591.h"
/**
* CAUTION: PLEASE SET LOW FREQUENCY
*/
#include <stddef.h>
#define PCF8591_CTRL_REG_READ 0x03
#define BV(x) (1 << (x))
uint8_t pcf8591_read(i2c_dev_t* dev, uint8_t analog_pin)
#define CTRL_AD_CH_MASK 0x03
#define CTRL_AD_IN_PRG 4
#define CTRL_AD_IN_PRG_MASK (0x03 << CTRL_AD_IN_PRG)
#define CTRL_DA_OUT_EN 6
uint8_t pcf8591_read(i2c_dev_t *dev, pcf8591_input_conf_t conf, uint8_t channel)
{
uint8_t res = 0;
uint8_t control_reg = PCF8591_CTRL_REG_READ & analog_pin;
uint8_t control_reg =
((conf << CTRL_AD_IN_PRG) & CTRL_AD_IN_PRG_MASK) |
(channel & CTRL_AD_CH_MASK) |
BV(CTRL_DA_OUT_EN);
i2c_slave_read(dev->bus, dev->addr, &control_reg, &res, 1);
return res;
}
void pcf8591_write(i2c_dev_t *dev, uint8_t value)
{
uint8_t buf[2] = { BV(CTRL_DA_OUT_EN), value };
i2c_slave_write(dev->bus, dev->addr, NULL, buf, 2);
}