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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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2
examples/pcf8591/main.c
View file

@ -23,7 +23,7 @@ static void measure(void *pvParameters)
while (1)
{
vTaskDelay(1000 / portTICK_PERIOD_MS);
printf("Value: %d\n", pcf8591_read(&dev, 0x03));
printf("Value: %d\n", pcf8591_read(&dev, PCF8591_IC_4_SINGLES, 3));
}
}

39
extras/pcf8591/pcf8591.c
View file

@ -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);
}

34
extras/pcf8591/pcf8591.h
View file

@ -4,11 +4,13 @@
*
* 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
*/
#ifndef _EXTRAS_PCF8591_H_
#define _EXTRAS_PCF8591_H_
#include <stdint.h>
#include <i2c/i2c.h>
#ifdef __cplusplus
@ -16,25 +18,33 @@ extern "C"
{
#endif
/**
* CAUTION: PLEASE SET I2C_FREQUENCY_400K IS 'false' IN 'i2c.h' FILE
*/
#define PCF8591_DEFAULT_ADDRESS 0x48
void pcf8591_init(void); //FIXME : library incomplete ?
/**
* Analog inputs configuration, see datasheet
*/
typedef enum {
PCF8591_IC_4_SINGLES = 0, //!< Four single-ended inputs
PCF8591_IC_DIFF, //!< Three differential inputs
PCF8591_IC_2_SINGLES_DIFF, //!< Two single-ended and differnetial mixed
PCF8591_IC_2_DIFFS //!< Two differential inputs
} pcf8591_input_conf_t;
/**
* Read input value of an analog pin.
* @param[in] addr Pointer to device
* @param[in] analog_pin pin number:
* 0 - AIN0
* 1 - AIN1
* 2 - AIN2
* 3 - AIN3
* @param[in] dev Pointer to device
* @param[in] conf Analog inputs configuration
* @param[in] channel Analog channel
* @return analog value
*/
uint8_t pcf8591_read(i2c_dev_t* dev, uint8_t analog_pin);
uint8_t pcf8591_read(i2c_dev_t *dev, pcf8591_input_conf_t conf, uint8_t channel);
/**
* Write value to analog output
* @param[in] dev Pointer to device
* @param[in] value DAC value
*/
void pcf8591_write(i2c_dev_t *dev, uint8_t value);
#ifdef __cplusplus