MSP430FR5969 SPI does not work like MSP430F247 SPI

MichRFT

Other Parts Discussed in Thread: MSP430F247, MSP430F149, MSP430F5419A, MSP430FR5969

Hello,

I have use the following code during many years on MSP430F149, MSP430F247 and MSP430F5419A to receive data on SPI:

unsigned char spi_rcv_byte_UCA0()
{
    unsigned char tmp;
    

    UCA0IFG &= ~UCRXIFG;
    
    /* re-Send the adr because 8 more clock edges requested*/
    UCA0TXBUF = 0xFF;
    /* Wait for the byte to be received */
    while (!(UCA0IFG & UCRXIFG));            // USCI RX buffer ready?
    
    tmp = UCA0RXBUF;
    return (tmp);
}

Now I use this code on MSP430FR5969 and it appears that some PCB have some issues sometimes:

the UCRXIFG flag never changes state.

Do you have any idea to solve this issue?

Best regards

Mich

over 9 years ago

0 Tony Philipsson over 9 years ago

Guru 12050 points

The old F149 have UASRT and the FR5960 have eUSCI
So there will be difference's, so look at SPI examples for eUSCI to see what they do different.

P.S I wish people stopped using while()
SPI is a IRQ driven system, use it.

0 Roberto Romano over 9 years ago

Guru 27285 points

Mich said:
I have use the following code during many years on MSP430F149, MSP430F247 and MSP430F5419A to receive data on SPI:

Are you sure of that?

F149 I am no more using for a long time has a single usart/SPI and is different from F247 where SPI separated from uart, registers names, I remember I rewrote library to use version 2xx. So if you are using code from 149 maybe doesn't work on 247 too.

0 MichRFT over 9 years ago in reply to Roberto Romano

Expert 2110 points

I only change the register name of course.

0 MichRFT over 9 years ago in reply to Tony Philipsson

Expert 2110 points

if UCRXIFG is not seen I do not see why the interrupt should trigger, so while or interrupt ....

0 Robert Cowsill over 9 years ago

Guru 16361 points

I suggest you post the rest of your code so we can see (e)USCI initialisation, port setup and general program flow.

0 MichRFT over 9 years ago in reply to MichRFT

Expert 2110 points

I found my fault. When migrating from a MSP430F247 to a MSP430FR5969, I switched the USCIs allocated to each functions. In the code modification I forgot to change one line and a sensor function read the UCA0RXBUF instead of the UCA1RXBUF. UCA0RXBUF sould be used by the uSD fonction not by the sensor function. As it depends of the uSD timing, this issue occured with some PCBAs and sometimes only.

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MSP430FR5969 SPI does not work like MSP430F247 SPI