EVM430-FR6043: UART communication

Alberto Aguayo

Part Number: EVM430-FR6043

Hello,

I'm working on the Demo Water Flow Measurement project. I want to send data by UART to ESP32 but data is not being received correctly. For this, I configured USCI_A1 so I can use RXD and TXD pins in J1 from EVM430FR6043. Software configuration is shown below, just sending data, not receiving.

WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog
    // Configure GPIO

    P1OUT &= ~BIT5;
    P1DIR |= BIT5;
    P1SEL0 |= 0x0C;

    // Disable the GPIO power-on default high-impedance mode to activate
    // previously configured port settings
    PM5CTL0 &= ~LOCKLPM5;

    UCA1CTLW0 = UCSWRST;                    // Put eUSCI in reset
    UCA1CTLW0 |= UCSSEL__SMCLK;             // CLK = SMCLK
    UCA1BRW = 8;                            // 1000000/115200 = 8.68
    UCA1MCTLW = 0xD600;                     // 1000000/115200 - INT(1000000/115200)=0.68
                                                   // UCBRSx value = 0xD6 (See UG)
    UCA1CTLW0 &= ~UCSWRST;                  // release from reset
    UCA1IE |= UCRXIE;                       // Enable USCI_A3 RX interrupt

    UCA1TXBUF = TXData;                 // Load data onto buffer

I believe configuration is correct because I communicated correctly between TX and RX pins through the same board, but if I connect TX for example externally to another device it doesn't work. I measured the TX signal with an oscilloscope and the signal is very unstable.

I also tried to use hal_uart_TxByte that is implemented in hal_uart.c but neither works.

Thanks in advance,

Alberto

over 1 year ago

0 Johnson He over 1 year ago

TI__Mastermind 28286 points

Hi Alberto,

You means that the communcation waveform is normal if don't connect ESP32?

And if connect ESP32, the communicatin will fail? I think maybe this cause by ESP32, have you test this via another MCU, or some UART tools?

Thanks!

Best Regards

Johnson

0 Alberto Aguayo over 1 year ago in reply to Johnson He

Prodigy 90 points

Hi Johnson,

Thanks for the reply. No, the waveform isn't correct even if I don't connect the board to ESP32, I measured UART waveform without being connected to any device.

I runned the "USSSWLib_template_example" because they use same pins for UART communication and it worked, so there should be some mistake in my configuration, but I don't where.

I attach the whole file where I'm configuring UART (line 385)

5315.hmi.c

Regards,

Alberto

0 Alberto Aguayo over 1 year ago in reply to Alberto Aguayo

Prodigy 90 points

Hello,

I fixed the problem. Thanks for help!

Regards,

Alberto

0 Sumit Mourya over 1 year ago in reply to Alberto Aguayo

Expert 1790 points

Hi,

Can You tell how you fixed the problem? I'm working on a gas application and have to send the data via UART .

+1 Alberto Aguayo over 1 year ago in reply to Sumit Mourya

Prodigy 90 points

Hi,

I finally used the "USSSWLib_template_example" project. I only copied the headers generated in the Design Center GUI into the project so flow measurements are correct and used the UART functions implemented in this project to send the data.

The project can be found here, but I think that's only for water. For gas, I found this, but I didn't try it.

Regards,

Alberto

0 Sumit Mourya over 1 year ago in reply to Alberto Aguayo

Expert 1790 points

Ok, So I generate my gas application configuration headers from USS Design Center and copy it in the USSSWLib_template_example.

I Think the UART pins are on Jumper J3 . In the code template Where to write the UART Code? I mean inside which function?

0 Alberto Aguayo over 1 year ago in reply to Sumit Mourya

Prodigy 90 points

The project is using eUSCI_A1 port, so you should use RXD and TXD on J1.

In my case I'm only sending data type char, so I used this function:

char yourData;
uartTxByte(yourData);

The project by itself is sending VFR and other parameters data in these lines.

uartTxUSSResult(APPLICATION_UART_ABSTOF_UPS_DELIM,&algResults.totalTOF_UPS);
uartTxUSSResult(APPLICATION_UART_ABSTOF_DNS_DELIM,&algResults.totalTOF_DNS);
uartTxUSSResult(APPLICATION_UART_DTOF_DELIM,&algResults.deltaTOF);
uartTxUSSResult(APPLICATION_UART_VFR_DELIM,&algResults.volumeFlowRate);

0 Sumit Mourya over 1 year ago in reply to Alberto Aguayo

Expert 1790 points

Dear Alberto,

Thank you for helping me with the queries.

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EVM430-FR6043: UART communication