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Always execute i2c bus recovery on setup (#2379)
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210a9a4162
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4 changed files with 72 additions and 0 deletions
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@ -2,6 +2,7 @@
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#include "i2c_bus_arduino.h"
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#include "esphome/core/log.h"
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#include <Arduino.h>
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#include <cstring>
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namespace esphome {
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@ -10,6 +11,7 @@ namespace i2c {
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static const char *const TAG = "i2c.arduino";
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void ArduinoI2CBus::setup() {
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recover();
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#ifdef USE_ESP32
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static uint8_t next_bus_num = 0;
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if (next_bus_num == 0)
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@ -90,6 +92,32 @@ ErrorCode ArduinoI2CBus::writev(uint8_t address, WriteBuffer *buffers, size_t cn
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return ERROR_UNKNOWN;
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}
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void ArduinoI2CBus::recover() {
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// Perform I2C bus recovery, see
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// https://www.analog.com/media/en/technical-documentation/application-notes/54305147357414AN686_0.pdf
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// or see the linux kernel implementation, e.g.
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// https://elixir.bootlin.com/linux/v5.14.6/source/drivers/i2c/i2c-core-base.c#L200
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// try to get about 100kHz toggle frequency
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const auto half_period_usec = 1000000 / 100000 / 2;
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const auto recover_scl_periods = 9;
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// configure scl as output
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pinMode(scl_pin_, OUTPUT); // NOLINT
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// set scl high
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digitalWrite(scl_pin_, 1); // NOLINT
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// in total generate 9 falling-rising edges
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for (auto i = 0; i < recover_scl_periods; i++) {
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delayMicroseconds(half_period_usec);
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digitalWrite(scl_pin_, 0); // NOLINT
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delayMicroseconds(half_period_usec);
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digitalWrite(scl_pin_, 1); // NOLINT
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}
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delayMicroseconds(half_period_usec);
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}
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} // namespace i2c
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} // namespace esphome
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@ -22,6 +22,9 @@ class ArduinoI2CBus : public I2CBus, public Component {
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void set_scl_pin(uint8_t scl_pin) { scl_pin_ = scl_pin; }
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void set_frequency(uint32_t frequency) { frequency_ = frequency; }
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private:
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void recover();
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protected:
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TwoWire *wire_;
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bool scan_;
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@ -1,6 +1,7 @@
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#ifdef USE_ESP_IDF
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#include "i2c_bus_esp_idf.h"
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#include "esphome/core/hal.h"
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#include "esphome/core/log.h"
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#include <cstring>
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@ -13,6 +14,8 @@ void IDFI2CBus::setup() {
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static i2c_port_t next_port = 0;
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port_ = next_port++;
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recover();
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i2c_config_t conf{};
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memset(&conf, 0, sizeof(conf));
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conf.mode = I2C_MODE_MASTER;
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@ -141,6 +144,41 @@ ErrorCode IDFI2CBus::writev(uint8_t address, WriteBuffer *buffers, size_t cnt) {
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return ERROR_OK;
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}
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void IDFI2CBus::recover() {
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// Perform I2C bus recovery, see
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// https://www.analog.com/media/en/technical-documentation/application-notes/54305147357414AN686_0.pdf
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// or see the linux kernel implementation, e.g.
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// https://elixir.bootlin.com/linux/v5.14.6/source/drivers/i2c/i2c-core-base.c#L200
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// try to get about 100kHz toggle frequency
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const auto half_period_usec = 1000000 / 100000 / 2;
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const auto recover_scl_periods = 9;
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const gpio_num_t scl_pin = static_cast<gpio_num_t>(scl_pin_);
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// configure scl as output
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gpio_config_t conf{};
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conf.pin_bit_mask = 1ULL << static_cast<uint32_t>(scl_pin_);
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conf.mode = GPIO_MODE_OUTPUT;
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conf.pull_up_en = GPIO_PULLUP_DISABLE;
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conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
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conf.intr_type = GPIO_INTR_DISABLE;
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gpio_config(&conf);
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// set scl high
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gpio_set_level(scl_pin, 1);
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// in total generate 9 falling-rising edges
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for (auto i = 0; i < recover_scl_periods; i++) {
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delayMicroseconds(half_period_usec);
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gpio_set_level(scl_pin, 0);
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delayMicroseconds(half_period_usec);
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gpio_set_level(scl_pin, 1);
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}
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delayMicroseconds(half_period_usec);
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}
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} // namespace i2c
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} // namespace esphome
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@ -24,6 +24,9 @@ class IDFI2CBus : public I2CBus, public Component {
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void set_scl_pullup_enabled(bool scl_pullup_enabled) { scl_pullup_enabled_ = scl_pullup_enabled; }
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void set_frequency(uint32_t frequency) { frequency_ = frequency; }
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private:
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void recover();
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protected:
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i2c_port_t port_;
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bool scan_;
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