Differences

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--- the_i2c_bus [2020/01/16 13:42] – [I²C in FRC] tell
+++ the_i2c_bus [2022/02/03 09:06] (current) – tell
@@ Line 15: / Line 15: @@
   * Each "slave" device has an address, and each slave on the bus must have a unique address.
   * Addresses are 7 bits long, therefore there are only 128 possible addresses.
-  * Some devices have pins that can chose from several addresses.  Others are limited to one per bus because the address can't be changed.
+  * Some devices have pins that can chose from several addresses.  Others are limited to one per bus because their address can't be changed.
-{{ :i2c-protocol.png |}}
 ====== I²C Protocol ======
@@ Line 28: / Line 28: @@
 This figure shows the basic idea: start, write one byte, acknowledge, stop:
-  {{ :i2c-protocol.png |}}
+{{ :i2c-protocol.png |}}
 All transfers start as shown here, with the master sending one byte onto the bus containing the 7 bit address and one bit that indicates whether the next byte will be a write (master to slave) or a read (slave sends to master).
@@ Line 55: / Line 55: @@
 This is often the best place to find such examples.  Reading the sample code can help you understand the part's datasheet.
+By 2021 there appeared FRC Java libraries for some of the I²C sensors that we've used.  But going back to the Arduino C code is necessary for some of the interesting ones that are less common in FRC.
@@ Line 74: / Line 71: @@
 ===== Eastbots I2C Tester =====
-In 2019 we had some flaky i2c operation, so I built this wiring tester
+In 2019 we had some flaky i2c operation, so we built this wiring tester
 [[testing_i2c_wiring]]