kopia lustrzana https://github.com/espressif/esp-idf
reduce speed of i2c master bus reset routine and release sda
rodzic
2b165f99c4
commit
34c1d25c7f
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@ -541,14 +541,23 @@ static esp_err_t i2c_master_clear_bus(i2c_port_t i2c_num)
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// because after some serious interference, the bus may keep high all the time and the i2c bus is out of service.
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gpio_set_direction(scl_io, GPIO_MODE_OUTPUT_OD);
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gpio_set_direction(sda_io, GPIO_MODE_OUTPUT_OD);
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gpio_set_level(scl_io, 1);
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int scl_half_period = 5; // use standard 100kHz data rate
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gpio_set_level(sda_io, 1);
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gpio_set_level(sda_io, 0);
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ets_delay_us(scl_half_period);
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gpio_set_level(scl_io, 1);
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ets_delay_us(scl_half_period);
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for (int i = 0; i < 9; i++) {
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gpio_set_level(scl_io, 0);
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ets_delay_us(scl_half_period);
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gpio_set_level(scl_io, 1);
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ets_delay_us(scl_half_period);
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}
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gpio_set_level(sda_io, 1);
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gpio_set_level(sda_io, 0); // setup stop condition (this is an implicit start condition)
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ets_delay_us(scl_half_period);
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gpio_set_level(sda_io, 1); // generate stop condition
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ets_delay_us(scl_half_period);
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i2c_set_pin(i2c_num, sda_io, scl_io, 1, 1, I2C_MODE_MASTER);
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return ESP_OK;
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}
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