ESPHome 2025.9.0-dev
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mcp23x17_base.cpp
Go to the documentation of this file.
1#include "mcp23x17_base.h"
3#include "esphome/core/log.h"
4
5namespace esphome {
6namespace mcp23x17_base {
7
8static const char *const TAG = "mcp23x17_base";
9
11 uint8_t data;
12 if (pin < 8) {
13 if (!this->read_reg(mcp23x17_base::MCP23X17_GPIOA, &data)) {
14 this->status_set_warning(ESP_LOG_MSG_COMM_FAIL);
15 return false;
16 }
17 this->input_mask_ = encode_uint16(this->input_mask_ >> 8, data);
18 } else {
19 if (!this->read_reg(mcp23x17_base::MCP23X17_GPIOB, &data)) {
20 this->status_set_warning(ESP_LOG_MSG_COMM_FAIL);
21 return false;
22 }
23 this->input_mask_ = encode_uint16(data, this->input_mask_ & 0xFF);
24 }
25 return true;
26}
27
28void MCP23X17Base::digital_write_hw(uint8_t pin, bool value) {
30 this->update_reg(pin, value, reg_addr);
31}
32
33bool MCP23X17Base::digital_read_cache(uint8_t pin) { return this->input_mask_ & (1 << pin); }
34
35void MCP23X17Base::pin_mode(uint8_t pin, gpio::Flags flags) {
38 if (flags == gpio::FLAG_INPUT) {
39 this->update_reg(pin, true, iodir);
40 this->update_reg(pin, false, gppu);
41 } else if (flags == (gpio::FLAG_INPUT | gpio::FLAG_PULLUP)) {
42 this->update_reg(pin, true, iodir);
43 this->update_reg(pin, true, gppu);
44 } else if (flags == gpio::FLAG_OUTPUT) {
45 this->update_reg(pin, false, iodir);
46 }
47}
48
53
54 switch (interrupt_mode) {
56 this->update_reg(pin, true, gpinten);
57 this->update_reg(pin, false, intcon);
58 break;
60 this->update_reg(pin, true, gpinten);
61 this->update_reg(pin, true, intcon);
62 this->update_reg(pin, true, defval);
63 break;
65 this->update_reg(pin, true, gpinten);
66 this->update_reg(pin, true, intcon);
67 this->update_reg(pin, false, defval);
68 break;
70 this->update_reg(pin, false, gpinten);
71 break;
72 }
73}
74
75void MCP23X17Base::update_reg(uint8_t pin, bool pin_value, uint8_t reg_addr) {
76 uint8_t bit = pin % 8;
77 uint8_t reg_value = 0;
78 if (reg_addr == mcp23x17_base::MCP23X17_OLATA) {
79 reg_value = this->olat_a_;
80 } else if (reg_addr == mcp23x17_base::MCP23X17_OLATB) {
81 reg_value = this->olat_b_;
82 } else {
83 this->read_reg(reg_addr, &reg_value);
84 }
85
86 if (pin_value) {
87 reg_value |= 1 << bit;
88 } else {
89 reg_value &= ~(1 << bit);
90 }
91
92 this->write_reg(reg_addr, reg_value);
93
94 if (reg_addr == mcp23x17_base::MCP23X17_OLATA) {
95 this->olat_a_ = reg_value;
96 } else if (reg_addr == mcp23x17_base::MCP23X17_OLATB) {
97 this->olat_b_ = reg_value;
98 }
99}
100
101} // namespace mcp23x17_base
102} // namespace esphome
void status_set_warning(const char *message=nullptr)
bool digital_read_cache(uint8_t pin) override
void pin_mode(uint8_t pin, gpio::Flags flags) override
void digital_write_hw(uint8_t pin, bool value) override
bool digital_read_hw(uint8_t pin) override
void pin_interrupt_mode(uint8_t pin, mcp23xxx_base::MCP23XXXInterruptMode interrupt_mode) override
uint16_t input_mask_
State read in digital_read_hw.
void update_reg(uint8_t pin, bool pin_value, uint8_t reg_a) override
virtual bool read_reg(uint8_t reg, uint8_t *value)
virtual bool write_reg(uint8_t reg, uint8_t value)
@ FLAG_OUTPUT
Definition gpio.h:19
@ FLAG_PULLUP
Definition gpio.h:21
@ FLAG_INPUT
Definition gpio.h:18
Providing packet encoding functions for exchanging data with a remote host.
Definition a01nyub.cpp:7
constexpr uint16_t encode_uint16(uint8_t msb, uint8_t lsb)
Encode a 16-bit value given the most and least significant byte.
Definition helpers.h:173