SLAA249B April   2005  – September 2018 MSP430F169 , MSP430F169 , MSP430F5252 , MSP430F5252 , MSP430F5253 , MSP430F5253 , MSP430F5254 , MSP430F5254 , MSP430F5255 , MSP430F5255 , MSP430F5256 , MSP430F5256 , MSP430F5257 , MSP430F5257 , MSP430F5258 , MSP430F5258 , MSP430F5259 , MSP430F5259

 

  1.   Implementing SMBus Using MSP430™ Hardware I2C
    1.     Trademarks
    2. 1 Introduction
    3. 2 SMBus Protocols
    4. 3 Software
    5. 4 Example Code
      1. 4.1 Example 1
        1.       fet140_SMB_mstr.c(.s43)
        2.       fet140_SMB_slav.c(.s43)
      2. 4.2 Example 2
        1.       fet140_SMB_mstr_slvrst.c(.s43)
        2.       fet140_SMB_slav_slvrst.c(.s43)
      3. 4.3 Example 3
        1.       fet140_SMB_mstr_PEC.c
        2.       fet140_SMB_slave_PEC.c
      4. 4.4 Example 4
        1.       fet140_SMB_tmp175.c
    6. 5 SMBus Using the USCI I2C Peripheral
      1. 5.1 Example 1a: Timeout Implementation for Master/Slave on a MSP430F2xx Device
        1.       msp430x26x_SMB_MST_timeout.c
        2.       msp430x26x_SMB_SLV_timeout.c
      2. 5.2 Example 1b: Timeout Implementation for Master/Slave on a MSP430F5xx Device
        1.       msp430x5xx_SMB_MST_timeout.c
        2.       msp430x5xx_SMB_SLV_timeout.c
      3. 5.3 Example 2: Implementation of CRC-8 PEC
        1.       msp430x26x_SMB_mstr_PEC.c
        2.       msp430x26x_SMB_slave_PEC.c
      4. 5.4 Example 3: Implementation With SMBUS Slave TMP175
        1.       msp430x26x_SMB_tmp175.c
    7. 6 Conclusion
    8. 7 References
  2.   Revision History

5.2 Example 1b: Timeout Implementation for Master/Slave on a MSP430F5xx Device

This example demonstrates SMBus READ WORD protocol using the USCI module. The USCI module on the MSP4305xx device family uses a shared interrupt vector scheme that combines the transmit, receive, and status interrupts into a single interrupt vector compared to two interrupt vectors on the 2xx USCI module. A MSP430F5438 device and TI target board (MSP-TS430PZ5x100) was used to test this. See the MSP430 Hardware Tools User's Guide for a schematic of the board.

This code is tested with the SMBus compatible BQ27541 device and a MSP430 as a Slave.