ESPHome 2025.9.0-dev
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mcp23x08_base.cpp
Go to the documentation of this file.
1#include "mcp23x08_base.h"
2#include "esphome/core/log.h"
3
4namespace esphome {
5namespace mcp23x08_base {
6
7static const char *const TAG = "mcp23x08_base";
8
11 this->status_set_warning(ESP_LOG_MSG_COMM_FAIL);
12 return false;
13 }
14 return true;
15}
16
17void MCP23X08Base::digital_write_hw(uint8_t pin, bool value) {
18 uint8_t reg_addr = mcp23x08_base::MCP23X08_OLAT;
19 this->update_reg(pin, value, reg_addr);
20}
21
22bool MCP23X08Base::digital_read_cache(uint8_t pin) { return this->input_mask_ & (1 << pin); }
23
24void MCP23X08Base::pin_mode(uint8_t pin, gpio::Flags flags) {
25 uint8_t iodir = mcp23x08_base::MCP23X08_IODIR;
26 uint8_t gppu = mcp23x08_base::MCP23X08_GPPU;
27 if (flags == gpio::FLAG_INPUT) {
28 this->update_reg(pin, true, iodir);
29 } else if (flags == (gpio::FLAG_INPUT | gpio::FLAG_PULLUP)) {
30 this->update_reg(pin, true, iodir);
31 this->update_reg(pin, true, gppu);
32 } else if (flags == gpio::FLAG_OUTPUT) {
33 this->update_reg(pin, false, iodir);
34 }
35}
36
38 uint8_t gpinten = mcp23x08_base::MCP23X08_GPINTEN;
39 uint8_t intcon = mcp23x08_base::MCP23X08_INTCON;
40 uint8_t defval = mcp23x08_base::MCP23X08_DEFVAL;
41
42 switch (interrupt_mode) {
44 this->update_reg(pin, true, gpinten);
45 this->update_reg(pin, false, intcon);
46 break;
48 this->update_reg(pin, true, gpinten);
49 this->update_reg(pin, true, intcon);
50 this->update_reg(pin, true, defval);
51 break;
53 this->update_reg(pin, true, gpinten);
54 this->update_reg(pin, true, intcon);
55 this->update_reg(pin, false, defval);
56 break;
58 this->update_reg(pin, false, gpinten);
59 break;
60 }
61}
62
63void MCP23X08Base::update_reg(uint8_t pin, bool pin_value, uint8_t reg_addr) {
64 uint8_t bit = pin % 8;
65 uint8_t reg_value = 0;
66 if (reg_addr == mcp23x08_base::MCP23X08_OLAT) {
67 reg_value = this->olat_;
68 } else {
69 this->read_reg(reg_addr, &reg_value);
70 }
71
72 if (pin_value) {
73 reg_value |= 1 << bit;
74 } else {
75 reg_value &= ~(1 << bit);
76 }
77
78 this->write_reg(reg_addr, reg_value);
79
80 if (reg_addr == mcp23x08_base::MCP23X08_OLAT) {
81 this->olat_ = reg_value;
82 }
83}
84
85} // namespace mcp23x08_base
86} // namespace esphome
void status_set_warning(const char *message=nullptr)
void update_reg(uint8_t pin, bool pin_value, uint8_t reg_a) override
bool digital_read_cache(uint8_t pin) override
void pin_mode(uint8_t pin, gpio::Flags flags) override
bool digital_read_hw(uint8_t pin) override
void digital_write_hw(uint8_t pin, bool value) override
uint8_t input_mask_
State read in digital_read_hw.
void pin_interrupt_mode(uint8_t pin, mcp23xxx_base::MCP23XXXInterruptMode interrupt_mode) 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