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I²C (Inter-Integrated Circuit) is a multi-drop serial bus invented by Philips (now NXP) for communication between ICs on the same PCB, i.e. short distance.
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I2C busy flag strange behaviour
HAL_GPIO_WritePin(i2c->sdaPort, i2c->sdaPin, GPIO_PIN_SET);
HAL_GPIO_WritePin(i2c->sclPort, i2c->sclPin, GPIO_PIN_SET);
wait_for_gpio_state_timeout(i2c->sclPort, i2c->sclPin, GPIO_PIN_SET, timeout … = i2c->sdaPin;
HAL_GPIO_Init(i2c->sdaPort, &GPIO_InitStructure);
// 13. …