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Add MCP3008 I/O Expander (#1057)
* Add MCP3008 * Fixed Travis build issues * Travis Build Fix * Fix Travis foramt issues * Travis fixes * Code review changes * Fix bit shift. off by one and selecting wrong pin * general fixes * lint Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
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23
esphome/components/mcp3008/__init__.py
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23
esphome/components/mcp3008/__init__.py
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import esphome.codegen as cg
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import esphome.config_validation as cv
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from esphome.components import spi
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from esphome.const import CONF_ID
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DEPENDENCIES = ['spi']
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AUTO_LOAD = ['sensor']
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MULTI_CONF = True
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CONF_MCP3008 = 'mcp3008'
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mcp3008_ns = cg.esphome_ns.namespace('mcp3008')
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MCP3008 = mcp3008_ns.class_('MCP3008', cg.Component, spi.SPIDevice)
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CONFIG_SCHEMA = cv.Schema({
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cv.GenerateID(): cv.declare_id(MCP3008),
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}).extend(spi.spi_device_schema(CS_PIN_required=True))
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def to_code(config):
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var = cg.new_Pvariable(config[CONF_ID])
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yield cg.register_component(var, config)
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yield spi.register_spi_device(var, config)
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52
esphome/components/mcp3008/mcp3008.cpp
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esphome/components/mcp3008/mcp3008.cpp
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#include "mcp3008.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mcp3008 {
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static const char *TAG = "mcp3008";
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float MCP3008::get_setup_priority() const { return setup_priority::HARDWARE; }
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void MCP3008::setup() {
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ESP_LOGCONFIG(TAG, "Setting up mcp3008");
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this->spi_setup();
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}
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void MCP3008::dump_config() {
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ESP_LOGCONFIG(TAG, "MCP3008:");
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LOG_PIN(" CS Pin: ", this->cs_);
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}
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float MCP3008::read_data_(uint8_t pin) {
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byte data_msb = 0;
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byte data_lsb = 0;
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byte command = ((0x01 << 7) | // start bit
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((pin & 0x07) << 4)); // channel number
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this->enable();
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this->transfer_byte(0x01);
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data_msb = this->transfer_byte(command) & 0x03;
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data_lsb = this->transfer_byte(0x00);
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this->disable();
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int data = data_msb << 8 | data_lsb;
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return data / 1024.0f;
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}
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MCP3008Sensor::MCP3008Sensor(MCP3008 *parent, std::string name, uint8_t pin)
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: PollingComponent(1000), parent_(parent), pin_(pin) {
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this->set_name(name);
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}
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void MCP3008Sensor::setup() { LOG_SENSOR("", "Setting up MCP3008 Sensor '%s'...", this); }
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void MCP3008Sensor::update() {
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float value_v = this->parent_->read_data_(pin_);
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this->publish_state(value_v);
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}
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} // namespace mcp3008
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} // namespace esphome
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42
esphome/components/mcp3008/mcp3008.h
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esphome/components/mcp3008/mcp3008.h
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#pragma once
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#include "esphome/core/component.h"
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#include "esphome/core/esphal.h"
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#include "esphome/components/sensor/sensor.h"
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#include "esphome/components/spi/spi.h"
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namespace esphome {
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namespace mcp3008 {
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class MCP3008Sensor;
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class MCP3008 : public Component,
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public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_LOW, spi::CLOCK_PHASE_LEADING,
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spi::DATA_RATE_1MHZ> { // At 3.3V 2MHz is too fast 1.35MHz is about right
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public:
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MCP3008() = default;
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void setup() override;
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void dump_config() override;
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float get_setup_priority() const override;
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protected:
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float read_data_(uint8_t pin);
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friend class MCP3008Sensor;
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};
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class MCP3008Sensor : public PollingComponent, public sensor::Sensor {
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public:
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MCP3008Sensor(MCP3008 *parent, std::string name, uint8_t pin);
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void setup() override;
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void update() override;
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protected:
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MCP3008 *parent_;
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uint8_t pin_;
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};
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} // namespace mcp3008
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} // namespace esphome
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23
esphome/components/mcp3008/sensor.py
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esphome/components/mcp3008/sensor.py
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import esphome.codegen as cg
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import esphome.config_validation as cv
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from esphome.components import sensor
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from esphome.const import CONF_ID, CONF_NUMBER, CONF_NAME
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from . import mcp3008_ns, MCP3008
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DEPENDENCIES = ['mcp3008']
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MCP3008Sensor = mcp3008_ns.class_('MCP3008Sensor', sensor.Sensor, cg.PollingComponent)
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CONF_MCP3008_ID = 'mcp3008_id'
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CONFIG_SCHEMA = sensor.SENSOR_SCHEMA.extend({
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cv.GenerateID(): cv.declare_id(MCP3008Sensor),
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cv.GenerateID(CONF_MCP3008_ID): cv.use_id(MCP3008),
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cv.Required(CONF_NUMBER): cv.int_,
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}).extend(cv.polling_component_schema('1s'))
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def to_code(config):
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parent = yield cg.get_variable(config[CONF_MCP3008_ID])
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var = cg.new_Pvariable(config[CONF_ID], parent, config[CONF_NAME], config[CONF_NUMBER])
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yield cg.register_component(var, config)
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