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add pcf8591 lib + example

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This commit is contained in:
thanhpn 2017-04-25 23:57:40 +07:00
parent b982a132ae
commit dbcb707c1c
3 changed files with 50 additions and 39 deletions
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49
examples/pcf8591/main.c
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@ -1,43 +1,36 @@
/*
* Example of using PCA9685 PWM driver
*
* Part of esp-open-rtos
* Copyright (C) 2016 Ruslan V. Uss <unclerus@gmail.com>
* Public domain
*/
#include <esp/uart.h>
#include <espressif/esp_common.h>
#include <i2c/i2c.h>
#include <pca9685/pca9685.h>
#include <stdio.h>
#define ADDR 0x40
#include "espressif/esp_common.h"
#include "esp/uart.h"
#include "FreeRTOS.h"
#include "task.h"
#include "i2c/i2c.h"
#include "pcf8591/pcf8591.h"
#define SCL_PIN 5
#define SDA_PIN 4
#define PWM_FREQ 500
static void measure(void *pvParameters)
{
while (1)
{
vTaskDelay(1000 / portTICK_PERIOD_MS);
printf("Value: %d\n", pcf8591_read(PCF8591_DEFAULT_ADDRESS, 0x03));
}
}
void user_init(void)
{
uart_set_baud(0, 115200);
// Just some information
printf("\n");
printf("SDK version : %s\n", sdk_system_get_sdk_version());
printf("GIT version : %s\n", GITSHORTREV);
i2c_init(SCL_PIN, SDA_PIN);
pca9685_init(ADDR);
pca9685_set_pwm_frequency(ADDR, 1000);
printf("Freq 1000Hz, real %d\n", pca9685_get_pwm_frequency(ADDR));
uint16_t val = 0;
while (true)
{
printf("Set ch0 to %d, ch4 to %d\n", val, 4096 - val);
pca9685_set_pwm_value(ADDR, 0, val);
pca9685_set_pwm_value(ADDR, 4, 4096 - val);
if (val++ == 4096)
val = 0;
}
xTaskCreate(measure, "measure_task", 256, NULL, 2, NULL);
}

19
extras/pcf8591/pcf8591.c
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@ -1,15 +1,22 @@
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <i2c/i2c.h>
#include "pcf8591.h"
static uint8_t mAddress = PCF8591_DEFAULT_ADDRESS;
static float mVoltage = 3.3f;
/**
* CAUTION: PLEASE SET I2C_FREQUENCY_400K IS 'false' IN 'i2c.h' FILE
*/
void
pcf8591_set_address(uint8_t addr)
#define PCF8591_CTRL_REG_READ 0x03
uint8_t
pcf8591_read(uint8_t addr, uint8_t analog_pin)
{
//
uint8_t res = 0;
uint8_t control_reg = PCF8591_CTRL_REG_READ & analog_pin;
i2c_slave_read(addr, &control_reg, &res, 1);
return res;
}

19
extras/pcf8591/pcf8591.h
View file

@ -14,14 +14,25 @@ extern "C"
{
#endif
#define PCF8591_DEFAULT_ADDRESS 0x90
/**
* CAUTION: PLEASE SET I2C_FREQUENCY_400K IS 'false' IN 'i2c.h' FILE
*/
#define PCF8591_DEFAULT_ADDRESS 0x48
void pcf8591_init(void);
/**
* Set new sensor address for switching another.
* Read input value of an analog pin.
* @param[in] addr Pointer to device
* @return none
* @param[in] analog_pin pin number:
* 0 - AIN0
* 1 - AIN1
* 2 - AIN2
* 3 - AIN3
* @return analog value
*/
void pcf8591_set_address(uint8_t addr);
uint8_t pcf8591_read(uint8_t addr, uint8_t analog_pin);
#ifdef __cplusplus