I want to point to one more thing here, the last bit of the address is kept 0 intentionally, because this bit is responsible for read(1)/ write(0) operation.The low-layer APIs (LL) offering a fast light-weight expert-oriented layer that is closer to the hardware than the HAL. The HAL is available for all the hardware peripherals. In this manner, we can connect up to 8 LCDs to the same line. The STM32Cube Hardware Abstraction Layer (HAL), an STM32 abstraction layer embedded software ensuring maximized portability across the STM32 microcontroller.So let’s say you connected A0 to ground, new address will be 01001100 which is 0x4C.To change the address of this device, you have to connect any/all of these three pins to ground, which is provided just above them.
By default these three pins are high so the address by default is 01001110 which is 0x4E.To change the address we are provided with A0, A1 and A2 pins. We also learned about using the wire library to communicate with the Inter-integrated circuit. The address of the PCF8574 is 0 1 0 0 A2 A1 A0 R/W. In the previous tutorial, we covered the I2C bus in Arduino.Well you generally don’t but as I mentioned in my previous article that we can connect up to 128 devices on the same I2C line and let’s say we want to connect two different LCDs on the same I2C line, than we can’t use two PCF8574 with same addresses and we need to modify one of them. The question you must be thinking is why we need to modify lower nibble? 1 of 10 Compiling ( Control/Sequential/STM.hs, dist/build/Control/Sequential/STM.o ) 2 of.
But lower nibble can be modified according to our convenience. The higher nibble of PCF8574 address is 0100 and this is fixed.
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