Using multiple hardware UARTs with the driver

MSP430User

Other Parts Discussed in Thread: MSP430FR5969

I'm using MSP430FR5969 Launchpad, TI-RTOS 2.12 and CCS 6.1.

I'm trying to use 2 UARTs on the MSP430 with the TI-RTOS UART driver. It works for one of them when I pass Board_UART0 to the driver's UART_open() (Board_UART0 is #defined as MSP_EXP430FR5969LP_UARTA1, which is the only element in an enum of UART devices). Why does the enumeration of UARTs on the board only contain this one, even though I know this board has at least 2 hardware UARTs? Is there any workaround to use more than one UART?

over 10 years ago

0 janet over 10 years ago

TI__Mastermind 22760 points

Hi,

To add another UART, you will need to add another UART entry to uartEUSCIAHWAttrs[] in MSP_EXP430FR5969LP.c:

/* UART configuration structure */
const UARTEUSCIA_HWAttrs uartEUSCIAHWAttrs[MSP_EXP430FR5969LP_UARTCOUNT] = {
    {
        EUSCI_A0_BASE,
        EUSCI_A_UART_CLOCKSOURCE_SMCLK,
        EUSCI_A_UART_LSB_FIRST,
        sizeof(uartEUSCIABaudrates)/sizeof(UARTEUSCIA_BaudrateConfig),
        uartEUSCIABaudrates
    },
    {
        EUSCI_A1_BASE,
        EUSCI_A_UART_CLOCKSOURCE_SMCLK,
        EUSCI_A_UART_LSB_FIRST,
        sizeof(uartEUSCIABaudrates)/sizeof(UARTEUSCIA_BaudrateConfig),
        uartEUSCIABaudrates
    },

};

Then add another entry in UARTConfig:

const UART_Config UART_config[] = {
    {
        &UARTEUSCIA_fxnTable,
        &uartEUSCIAObjects[0],
        &uartEUSCIAHWAttrs[0]
    },
    {
        &UARTEUSCIA_fxnTable,
        &uartEUSCIAObjects[1],
        &uartEUSCIAHWAttrs[1]
    },

{NULL, NULL, NULL}
};

In MSP_EXP430FR5969LP.h, add a new UART name:

/*!
* @def    MSP_EXP430FR5969LP_UARTName
* @brief Enum of UART names on the MSP_EXP430FR5969LP dev board
*/
typedef enum MSP_EXP430FR5969LP_UARTName {
    MSP_EXP430FR5969LP_UARTA1 = 0,
    MSP_EXP430FR5969LP_UARTA0 = 1,
    MSP_EXP430FR5969LP_UARTCOUNT
} MSP_EXP430FR5969LP_UARTName;

And in Board.h,

#define Board_UART1 MSP_EXP430FR5969LP_UARTA0

The code I have added is in red. Please let me know if you have problems with this (I haven't actually tried it out).

Best regards,

Janet

0 MSP430User over 10 years ago in reply to janet

Prodigy 100 points

Your advice worked, when I also added pin multiplex options for the TX/RX pins (P2.5/P2.6) to the UART init function in MSP_EXP430FR5969LP.c

(changes in red)

* ======== MSP_EXP430FR5969LP_initUART ========

void MSP_EXP430FR5969LP_initUART(void)

{

/* P4.4,5 = USCI_A1 TXD/RXD */

GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P2,

GPIO_PIN0, GPIO_SECONDARY_MODULE_FUNCTION);

GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P2,

GPIO_PIN1, GPIO_SECONDARY_MODULE_FUNCTION);

//ADDED:

GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P2,

GPIO_PIN5, GPIO_SECONDARY_MODULE_FUNCTION);

GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P2,

GPIO_PIN6, GPIO_SECONDARY_MODULE_FUNCTION);

/* Initialize the UART driver */

UART_init();

}

Thanks!

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Using multiple hardware UARTs with the driver