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Driver + example for MCP4725 12-bit I2C DAC

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UncleRus 2016-11-19 21:25:21 +05:00
parent 6481f71ce0
commit 16b38f94b0
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examples/mcp4725_test/Makefile Normal file
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PROGRAM = mcp4725_test
EXTRA_COMPONENTS = extras/i2c extras/mcp4725
#ESPBAUD = 460800
include ../../common.mk

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examples/mcp4725_test/main.c Normal file
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/*
* Example of using MCP4725 DAC
*
* Part of esp-open-rtos
* Copyright (C) 2016 Ruslan V. Uss <unclerus@gmail.com>
* BSD Licensed as described in the file LICENSE
*/
#include <esp/uart.h>
#include <espressif/esp_common.h>
#include <i2c/i2c.h>
#include <mcp4725/mcp4725.h>
#include <stdio.h>
#include <FreeRTOS.h>
#include <task.h>
#define SCL_PIN 5
#define SDA_PIN 4
#define ADDR MCP4725A0_ADDR0
#define VDD 3.3
inline static void wait_for_eeprom()
{
while (mcp4725_eeprom_busy(ADDR))
{
printf("...DAC is busy, waiting...\n");
vTaskDelay(1);
}
}
void user_init(void)
{
uart_set_baud(0, 115200);
printf("SDK version:%s\n", sdk_system_get_sdk_version());
i2c_init(SCL_PIN, SDA_PIN);
// setup EEPROM values
if (mcp4725_get_power_mode(ADDR, true) != MCP4725_PM_NORMAL)
{
printf("DAC was sleeping... Wake up Neo!\n");
mcp4725_set_power_mode(ADDR, MCP4725_PM_NORMAL, true);
wait_for_eeprom();
}
printf("Set default DAC ouptut value to MAX...\n");
mcp4725_set_raw_output(ADDR, MCP4725_MAX_VALUE, true);
wait_for_eeprom();
printf("And now default DAC output value is 0x%03x\n", mcp4725_get_raw_output(ADDR, true));
printf("Now let's generate the sawtooth wave in slow manner\n");
float vout = 0;
while (true)
{
vout += 0.1;
if (vout > VDD) vout = 0;
printf("Vout: %.02f\n", vout);
mcp4725_set_voltage(ADDR, VDD, vout, false);
// It will be very low freq wave
vTaskDelay(100 / portTICK_PERIOD_MS);
}
}