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MSP430FR2476: MSP430FR2476

luigi Quaglia
Expert 1155 points
Part Number: MSP430FR2476
Other Parts Discussed in Thread: MSP430FR2433, MSP430WARE, MSP430F5659, MSP430FR5972

HI Guy 

I have some problem with I2cbus of MSp430fr2476 

I just using this routine on other Msp and don't have any problem, also I have aplly the Spi

and other peripheral  without any problem 

1) If  I check the basic configuration after reset and before that I configure the I2cbus the bit UCMM into the UCB1CTLW0 is always at 1 ( Multiple-master environment)  and not like 

on the manual at 0 (Single master environment)  , ok no problem I reset this bit with firmware. 

2) this is my configuration 

bisx.b #UCSWRST,UCB1CTL1
bicx.b #UCMM,UCB1CTLW0
bisx.w #(UCMODE_3+UCMST),UCB1CTLW0 ;* mode=I2c , master mode, sync mode, SMCLK clock source
movx.w #128,UCB1BRW    ;* 
bisx.b #(SCL+SDA),P4SEL0 ;* i2c on the port 4

bisx.w #(UCASTP0+UCASTP1),UCB1CTLW1 ;*have try with and without this istruction but not change, this istraction is present in other foirmware 

bicx.b #UCSWRST,UCB1CTL1

when clear the bit UCSWRST immediately is set the  BUSY bit UCB!STATW, and the I2c is in effect blocked 

what can be ? 

Regards 

Luigi

  • 0
    TI__Guru 56685 points

    Hello Luigi,

    For general I2C trouble shooting, I would check out the following app note: www.ti.com/lit/slaa734 

    I would also recommend looking at our example code for this device which can be found here: https://dev.ti.com/tirex/explore/node?node=AP.JkZ1QybyGoEKRdg.a6A__IOGqZri__LATEST

    We don't have a specific example in assembly for I2C, but there are UART and SPI example that utilize the eUSCI for MSP430FR2433 within MSP430Ware. You could look at those for guidance as well, but it is recommended to work in C. 

  • 0
    Expert 1155 points

    Hello Jace 

    thank you for your prompt reply, I don't have at the moment problem with SPI or Uart I use Spi without any problem,

    the i2c routine and configuration is used with other processor without any problem msp430f2955 MSP430F5659

    MSP430FR5972, only on this Itme I have problem 

    I will check your suggestion thank you 

    Luigi 

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