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I2CManager.h
13
I2CManager.h
@ -84,8 +84,6 @@
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*/
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/*
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* Future enhancement possibility:
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*
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* I2C Multiplexer (e.g. TCA9547, TCA9548)
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*
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* A multiplexer offers a way of extending the address range of I2C devices. For example, GPIO extenders use address range 0x20-0x27
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@ -98,11 +96,6 @@
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* Thirdly, the multiplexer offers the ability to use mixed-speed devices more effectively, by allowing high-speed devices to be
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* put on a different bus to low-speed devices, enabling the software to switch the I2C speed on-the-fly between I2C transactions.
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*
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* Changes required: Increase the size of the I2CAddress field in the IODevice class from uint8_t to uint16_t.
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* The most significant byte would contain a '1' bit flag, the multiplexer number (0-7) and bus number (0-7). Then, when performing
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* an I2C operation, the I2CManager would check this byte and, if zero, do what it currently does. If the byte is non-zero, then
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* that means the device is connected via a multiplexer so the I2C transaction should be preceded by a select command issued to the
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* relevant multiplexer.
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*
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* Non-interrupting I2C:
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*
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@ -138,13 +131,9 @@
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// may be extended to include multiple buses, and other features.
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// Uncomment to enable extended address.
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//
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// WARNING: When I2CAddress is passed to formatting commands such as DIAG, LCD etc,
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// it should be cast to (int) to ensure that the address value is passed rather than
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// the struct.
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//#define I2C_EXTENDED_ADDRESS
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/////////////////////////////////////////////////////////////////////////////////////
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// Extended I2C Address type to facilitate extended I2C addresses including
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// I2C multiplexer support.
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@ -184,7 +173,7 @@ enum I2CSubBus : uint8_t {
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#endif
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SubBus_No, // Number of subbuses (highest + 1)
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SubBus_None = 254, // Disable all sub-buses on selected mux
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SubBus_All = 255, // Enable all sub-buses
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SubBus_All = 255, // Enable all sub-buses (not supported by some multiplexers)
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};
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// Type to hold I2C address
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