add support for SN74HC595 shift register (#1083)

* add support for SN74HC595 shift register

* fix linter errors

* more linter reported issues fixed

* hopefully last linter error cleanup

* one more linter fix

* looks like the linter is always keeping stuff for later, is this the final fix?

* add test

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
This commit is contained in:
phjr 2020-06-28 00:08:15 +02:00 committed by GitHub
parent ca4107d450
commit 3c9712d683
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 198 additions and 3 deletions

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@ -0,0 +1,54 @@
import esphome.codegen as cg
import esphome.config_validation as cv
from esphome import pins
from esphome.const import CONF_ID, CONF_NUMBER, CONF_INVERTED, CONF_DATA_PIN, CONF_CLOCK_PIN
DEPENDENCIES = []
MULTI_CONF = True
sn74hc595_ns = cg.esphome_ns.namespace('sn74hc595')
SN74HC595Component = sn74hc595_ns.class_('SN74HC595Component', cg.Component)
SN74HC595GPIOPin = sn74hc595_ns.class_('SN74HC595GPIOPin', cg.GPIOPin)
CONF_SN74HC595 = 'sn74hc595'
CONF_LATCH_PIN = 'latch_pin'
CONF_OE_PIN = 'oe_pin'
CONF_SR_COUNT = 'sr_count'
CONFIG_SCHEMA = cv.Schema({
cv.Required(CONF_ID): cv.declare_id(SN74HC595Component),
cv.Required(CONF_DATA_PIN): pins.gpio_output_pin_schema,
cv.Required(CONF_CLOCK_PIN): pins.gpio_output_pin_schema,
cv.Required(CONF_LATCH_PIN): pins.gpio_output_pin_schema,
cv.Optional(CONF_OE_PIN): pins.gpio_output_pin_schema,
cv.Optional(CONF_SR_COUNT, default=1): cv.int_range(1, 4)
}).extend(cv.COMPONENT_SCHEMA)
def to_code(config):
var = cg.new_Pvariable(config[CONF_ID])
yield cg.register_component(var, config)
data_pin = yield cg.gpio_pin_expression(config[CONF_DATA_PIN])
cg.add(var.set_data_pin(data_pin))
clock_pin = yield cg.gpio_pin_expression(config[CONF_CLOCK_PIN])
cg.add(var.set_clock_pin(clock_pin))
latch_pin = yield cg.gpio_pin_expression(config[CONF_LATCH_PIN])
cg.add(var.set_latch_pin(latch_pin))
oe_pin = yield cg.gpio_pin_expression(config[CONF_OE_PIN])
cg.add(var.set_oe_pin(oe_pin))
cg.add(var.set_sr_count(config[CONF_SR_COUNT]))
SN74HC595_OUTPUT_PIN_SCHEMA = cv.Schema({
cv.Required(CONF_SN74HC595): cv.use_id(SN74HC595Component),
cv.Required(CONF_NUMBER): cv.int_,
cv.Optional(CONF_INVERTED, default=False): cv.boolean,
})
SN74HC595_INPUT_PIN_SCHEMA = cv.Schema({})
@pins.PIN_SCHEMA_REGISTRY.register(CONF_SN74HC595,
(SN74HC595_OUTPUT_PIN_SCHEMA, SN74HC595_INPUT_PIN_SCHEMA))
def sn74hc595_pin_to_code(config):
parent = yield cg.get_variable(config[CONF_SN74HC595])
yield SN74HC595GPIOPin.new(parent, config[CONF_NUMBER], config[CONF_INVERTED])

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@ -0,0 +1,70 @@
#include "sn74hc595.h"
#include "esphome/core/log.h"
namespace esphome {
namespace sn74hc595 {
static const char *TAG = "sn74hc595";
void SN74HC595Component::setup() {
ESP_LOGCONFIG(TAG, "Setting up SN74HC595...");
if (this->have_oe_pin_) { // disable output
pinMode(this->oe_pin_->get_pin(), OUTPUT);
digitalWrite(this->oe_pin_->get_pin(), HIGH);
}
// initialize output pins
pinMode(this->clock_pin_->get_pin(), OUTPUT);
pinMode(this->data_pin_->get_pin(), OUTPUT);
pinMode(this->latch_pin_->get_pin(), OUTPUT);
digitalWrite(this->clock_pin_->get_pin(), LOW);
digitalWrite(this->data_pin_->get_pin(), LOW);
digitalWrite(this->latch_pin_->get_pin(), LOW);
// send state to shift register
this->write_gpio_();
}
void SN74HC595Component::dump_config() { ESP_LOGCONFIG(TAG, "SN74HC595:"); }
bool SN74HC595Component::digital_read_(uint8_t pin) { return bitRead(this->output_bits_, pin); }
void SN74HC595Component::digital_write_(uint8_t pin, bool value) {
bitWrite(this->output_bits_, pin, value);
this->write_gpio_();
}
bool SN74HC595Component::write_gpio_() {
for (int i = this->sr_count_ - 1; i >= 0; i--) {
uint8_t data = (uint8_t)(this->output_bits_ >> (8 * i) & 0xff);
shiftOut(this->data_pin_->get_pin(), this->clock_pin_->get_pin(), MSBFIRST, data);
}
// pulse latch to activate new values
digitalWrite(this->latch_pin_->get_pin(), HIGH);
digitalWrite(this->latch_pin_->get_pin(), LOW);
// enable output if configured
if (this->have_oe_pin_) {
digitalWrite(this->oe_pin_->get_pin(), LOW);
}
return true;
}
float SN74HC595Component::get_setup_priority() const { return setup_priority::IO; }
void SN74HC595GPIOPin::setup() {}
bool SN74HC595GPIOPin::digital_read() { return this->parent_->digital_read_(this->pin_) != this->inverted_; }
void SN74HC595GPIOPin::digital_write(bool value) {
this->parent_->digital_write_(this->pin_, value != this->inverted_);
}
SN74HC595GPIOPin::SN74HC595GPIOPin(SN74HC595Component *parent, uint8_t pin, bool inverted)
: GPIOPin(pin, OUTPUT, inverted), parent_(parent) {}
} // namespace sn74hc595
} // namespace esphome

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@ -0,0 +1,55 @@
#pragma once
#include "esphome/core/component.h"
#include "esphome/core/esphal.h"
namespace esphome {
namespace sn74hc595 {
class SN74HC595Component : public Component {
public:
SN74HC595Component() = default;
void setup() override;
float get_setup_priority() const override;
void dump_config() override;
void set_data_pin(GPIOPin *pin) { data_pin_ = pin; }
void set_clock_pin(GPIOPin *pin) { clock_pin_ = pin; }
void set_latch_pin(GPIOPin *pin) { latch_pin_ = pin; }
void set_oe_pin(GPIOPin *pin) {
oe_pin_ = pin;
have_oe_pin_ = true;
}
void set_sr_count(uint8_t count) { sr_count_ = count; }
protected:
friend class SN74HC595GPIOPin;
bool digital_read_(uint8_t pin);
void digital_write_(uint8_t pin, bool value);
bool write_gpio_();
GPIOPin *data_pin_;
GPIOPin *clock_pin_;
GPIOPin *latch_pin_;
GPIOPin *oe_pin_;
uint8_t sr_count_;
bool have_oe_pin_{false};
uint32_t output_bits_{0x00};
};
/// Helper class to expose a SC74HC595 pin as an internal output GPIO pin.
class SN74HC595GPIOPin : public GPIOPin {
public:
SN74HC595GPIOPin(SN74HC595Component *parent, uint8_t pin, bool inverted = false);
void setup() override;
bool digital_read() override;
void digital_write(bool value) override;
protected:
SN74HC595Component *parent_;
};
} // namespace sn74hc595
} // namespace esphome

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@ -1187,13 +1187,13 @@ light:
if (initial_run) {
it[0] = current_color;
}
- wled:
port: 11111
- adalight:
uart_id: adalight_uart
- automation:
name: Custom Effect
sequence:
@ -1465,6 +1465,14 @@ switch:
id: my_stepper
position: 0
- platform: gpio
name: "SN74HC595 Pin #0"
pin:
sn74hc595: sn74hc595_hub
# Use pin number 0
number: 0
inverted: False
fan:
- platform: binary
output: gpio_26
@ -1715,3 +1723,11 @@ text_sensor:
name: "BSSID"
mac_address:
name: "Mac Address"
sn74hc595:
- id: 'sn74hc595_hub'
data_pin: GPIO21
clock_pin: GPIO23
latch_pin: GPIO22
oe_pin: GPIO32
sr_count: 2