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--- microcontrollers:common_communication_types [2024/10/30 19:12] – [I2C (Inter-Integrated Circuit)] ibchadmin
+++ microcontrollers:common_communication_types [2024/10/30 19:21] (current) – ibchadmin
@@ Line 74: / Line 74: @@
 ===== I2C (Inter-Integrated Circuit) =====
+The I2C lives on **UCBO** on a MSP430 board.
 {{ :microcontrollers:i2c.png?direct&400 |}}
-  * SDA: Data
+  * SDA: Data (default pin 1.6)
-  * SCL: Clock
+  * SCL: Clock (default pin 1.7)
 Pull Low to send information.
@@ Line 96: / Line 98: @@
 Using clock stretching, the bus can be easily arbitrated: this stalls the bus by holding SCL low.  This can be used to allow multiple nodes to be aware of when the bus is in use, or allow a device to stall the bus if more time is needed to handle data.
+==== Setup ====
+{{ :microcontrollers:i2c3.png?direct&400 |}}
+  * UCSWRST: Put USCI_B in reset state
+  * UCMODE_3: I2C Mode
+  * UCMST: Master Mode
+  * UCSYNC: Syncronous mode
+  * UCB0BRW: Baud rate SMCLK / 0x<UCB0BRW>
+==== Sending data ====
+{{ :microcontrollers:i2c4.png?direct&400 |}}
+==== Reading data ====
+{{ :microcontrollers:i2c5.png?direct&400 |}}
+{{ :microcontrollers:i2c6.png?direct&400 |}}
+===== References and Further Reading =====
+  * http://www.argenox.com/library/msp430/
+  * http://www.simplyembedded.org/tutorials/
+  * Msp430FR5994 User’s guide http://www.ti.com/lit/ug/slau367o/slau367o.pdf
+  * Evaluation of Power Efficiency for Digital Serial Interfaces of Microcontrollers  https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6208716