RTOS/MSP432E401Y: MSP432E401Y UART HARDWARE CONNECTION

kalyan

Part Number: MSP432E401Y
Other Parts Discussed in Thread: MAX3232, , MSP-EXP432E401Y

Tool/software: TI-RTOS

Hi ,

Can anyone suggest me the hardware connections and the sample program for uart data transfer using msp432e401y launchpad. I want to transmit the data to the external sensor using uart.

I have attached the block diagram that i have used and i am using uartecho program. and i have few more

doubts.

1. can i power on the kit using the mini usb near by RJ45 connector in the launchpad.

2. To configure it ifor uart data transfer am i need to use the R5 & R6 resistors as shown in the figure or these are for serial boot loading.

Thank you

Regards

Kalyan K.

over 7 years ago

0 Keith Barkley over 7 years ago

Guru 41995 points

Frankly, I would use one of the other UARTS to communicate with your instrument so that the one you are using is available for back-channel communications.

0 kalyan over 7 years ago in reply to Keith Barkley

Expert 1705 points

Hi sir,
Thank you for the reply.Whatever you said absolutely right.However my concern here is that whether the connections are ok or not.
am i need to use R5 & R6 resistors?.

0 kalyan over 7 years ago in reply to kalyan

Expert 1705 points

and what about that mini usb near by ethernet connector. Can I power on the microcontroller using that mini USB?

0 Chris Sterzik over 7 years ago in reply to kalyan

TI__Guru 58186 points

You do not need to inlcude resistors R5 and R6 unless you are providing a BSL connection via the BSL connector.

The power can be applied to the USB target connection.

Regards,

Chris

0 kalyan over 7 years ago in reply to Chris Sterzik

Expert 1705 points

Hi chris,
Thanks for the reply.However i have not got the answer for the question whether the hardware connections are write or not?.

actually, i have removed jumpers on JP4 & JP5 connectors and connected PA0 pin in JP4 to max3232 pin 14(TX) and PA1 pin in JP5 to pin 13(Rx). and i have flashed uartecho program.
will this work sir?

If i use UART4 Pins in J7 header, PK0 & PK1 instead of PA0 & PA1, what must be the changes in uartecho program.

Thank you

Regards
kalyan.

0 kalyan over 7 years ago in reply to kalyan

Expert 1705 points

/* =============================== UART =============================== */

#include <ti/drivers/UART.h>

#include <ti/drivers/uart/UARTMSP432E4.h>

UARTMSP432E4_Object uartMSP432E4Objects[MSP_EXP432E401Y_UARTCOUNT];

UARTMSP432E4_Object uart4MSP432E4Objects[MSP_EXP432E401Y_UARTCOUNT];

unsigned char uartMSP432E4RingBuffer[MSP_EXP432E401Y_UARTCOUNT][32];

/* UART configuration structure */

const UARTMSP432E4_HWAttrs uartMSP432E4HWAttrs[MSP_EXP432E401Y_UARTCOUNT] = {

{

.baseAddr = UART0_BASE,

.intNum = INT_UART4,

.intPriority = (~0),

.flowControl = UARTMSP432E4_FLOWCTRL_NONE,

.ringBufPtr = uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0],

.ringBufSize = sizeof(uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0]),

.rxPin = UARTMSP432E4_PA0_U0RX,

.txPin = UARTMSP432E4_PA1_U0TX,

.ctsPin = UARTMSP432E4_PIN_UNASSIGNED,

.rtsPin = UARTMSP432E4_PIN_UNASSIGNED,

.errorFxn = NULL

}

};

const UARTMSP432E4_HWAttrs uart4MSP432E4HWAttrs[MSP_EXP432E401Y_UARTCOUNT] = {

{

.baseAddr = UART4_BASE,

.intNum = INT_UART0,

.intPriority = (~0),

.flowControl = UARTMSP432E4_FLOWCTRL_NONE,

.ringBufPtr = uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART4],

.ringBufSize = sizeof(uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART4]),

.rxPin = UARTMSP432E4_PK0_U4RX,

.txPin = UARTMSP432E4_PK1_U4TX,

.ctsPin = UARTMSP432E4_PIN_UNASSIGNED,

.rtsPin = UARTMSP432E4_PIN_UNASSIGNED,

.errorFxn = NULL

}

};

const UART_Config UART_config[MSP_EXP432E401Y_UARTCOUNT] = {

{

.fxnTablePtr = &UARTMSP432E4_fxnTable,

.object = &uartMSP432E4Objects[MSP_EXP432E401Y_UART0],

.hwAttrs = &uartMSP432E4HWAttrs[MSP_EXP432E401Y_UART0]

}

};

const UART_Config UART4_config[MSP_EXP432E401Y_UARTCOUNT] = {

{

.fxnTablePtr = &UARTMSP432E4_fxnTable,

.object = &uart4MSP432E4Objects[MSP_EXP432E401Y_UART4],

.hwAttrs = &uart4MSP432E4HWAttrs[MSP_EXP432E401Y_UART4]

}

};

const uint_least8_t UART_count = MSP_EXP432E401Y_UARTCOUNT;

/* In msp432e401y.h */

/*!

* @def MSP_EXP432E401Y_UARTName

* @brief Enum of UARTs on the MSP_EXP432E401Y dev board

typedef enum MSP_EXP432E401Y_UARTName {

MSP_EXP432E401Y_UART0 = 0,

MSP_EXP432E401Y_UART4 = 4,

MSP_EXP432E401Y_UARTCOUNT

} MSP_EXP432E401Y_UARTName;

/* In Board.h */

#define Board_UART0 MSP_EXP432E401Y_UART0

#define Board_UART4 MSP_EXP432E401Y_UART4

* ======== uartecho.c ========

#include <stdint.h>

#include <stddef.h>

/* Driver Header files */

#include <ti/drivers/GPIO.h>

#include <ti/drivers/UART.h>

/* Example/Board Header files */

#include "Board.h"

* ======== mainThread ========

void *mainThread(void *arg0)

{

char input ;

const char echoPrompt[] = "Echoing characters:\r\n";

UART_Handle uart;

UART_Params uartParams;

/* Call driver init functions */

GPIO_init();

UART_init();

/* Configure the LED pin */

GPIO_setConfig(Board_GPIO_LED0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

/* Turn on user LED */

GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);

/* Create a UART with data processing off. */

UART_Params_init(&uartParams);

uartParams.writeDataMode = UART_DATA_BINARY;

uartParams.readDataMode = UART_DATA_BINARY;

uartParams.readReturnMode = UART_RETURN_FULL;

uartParams.readEcho = UART_ECHO_OFF;

uartParams.baudRate = 115200;

// uart = UART_open(Board_UART0, &uartParams);

uart = UART_open(Board_UART4, &uartParams);

if (uart == NULL) {

/* UART_open() failed */

while (1);

}

// UART_write(uart, echoPrompt, sizeof(echoPrompt));

/* Loop forever echoing */

while (1) {

UART_read(uart, &input, 1);

UART_write(uart, &input, 1);

// GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);

// UART_write(uart, &input, 1);

}

Hi,

I have made these changes in the uartecho program for transferring data with uart4 port , however it is not happening.

Can anyone help me

0 Sven Probst over 7 years ago in reply to kalyan

Expert 1630 points

Hi Kalyan,

this code doubling is not as it works with the TI Drivers. It is intended to extend the given arrays.
MSP_EXP432E401Y_UART4 is an index into those arrays, thus it should be 1 and not 4 (after extending UART_config).

As a first step I would simply use the existing code and map it to a different uart. This is done in the uartMSP432E4HWAttrs array.
It should look like:
const UARTMSP432E4_HWAttrs uartMSP432E4HWAttrs[MSP_EXP432E401Y_UARTCOUNT] = {
{
.baseAddr = UART4_BASE,
.intNum = INT_UART4,
.intPriority = (~0),
.flowControl = UARTMSP432E4_FLOWCTRL_NONE,
.ringBufPtr = uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0],
.ringBufSize = sizeof(uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0]),
.rxPin = UARTMSP432E4_PK0_U4RX,
.txPin = UARTMSP432E4_PK1_U4TX,
.ctsPin = UARTMSP432E4_PIN_UNASSIGNED,
.rtsPin = UARTMSP432E4_PIN_UNASSIGNED,
.errorFxn = NULL
}
};
For clarity you could rename "MSP_EXP432E401Y_UART0" to "MSP_EXP432E401Y_UART4", but keep its value 0 for this redirection approach.

It you are interested in using multiple uarts you have to change the value "MSP_EXP432E401Y_UARTCOUNT" to the number of uarts you are going to use. Additionally you have to extend the arrays.
Example:

#define MSP_EXP432E401Y_UARTCOUNT 2

...

const UARTMSP432E4_HWAttrs uartMSP432E4HWAttrs[MSP_EXP432E401Y_UARTCOUNT] = {
{
.baseAddr = UART0_BASE,
.intNum = INT_UART0,
.intPriority = (~0),
.flowControl = UARTMSP432E4_FLOWCTRL_NONE,
.ringBufPtr = uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0],
.ringBufSize = sizeof(uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0]),
.rxPin = UARTMSP432E4_PA0_U0RX,
.txPin = UARTMSP432E4_PA1_U0TX,
.ctsPin = UARTMSP432E4_PIN_UNASSIGNED,
.rtsPin = UARTMSP432E4_PIN_UNASSIGNED,
.errorFxn = NULL
},
{
.baseAddr = UART4_BASE,
.intNum = INT_UART4,
.intPriority = (~0),
.flowControl = UARTMSP432E4_FLOWCTRL_NONE,
.ringBufPtr = uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART4],
.ringBufSize = sizeof(uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART4]),
.rxPin = UARTMSP432E4_PK0_U4RX,
.txPin = UARTMSP432E4_PK1_U4TX,
.ctsPin = UARTMSP432E4_PIN_UNASSIGNED,
.rtsPin = UARTMSP432E4_PIN_UNASSIGNED,
.errorFxn = NULL
}
};

const UART_Config UART_config[MSP_EXP432E401Y_UARTCOUNT] = {
{
.fxnTablePtr = &UARTMSP432E4_fxnTable,
.object = &uartMSP432E4Objects[MSP_EXP432E401Y_UART0],
.hwAttrs = &uartMSP432E4HWAttrs[MSP_EXP432E401Y_UART0]
},
{
.fxnTablePtr = &UARTMSP432E4_fxnTable,
.object = &uartMSP432E4Objects[MSP_EXP432E401Y_UART4],
.hwAttrs = &uartMSP432E4HWAttrs[MSP_EXP432E401Y_UART4]
}
};

I didn't check this example, thus please don't blame me for typos.

0 kalyan over 7 years ago in reply to Sven Probst

Expert 1705 points

Hi Sven Probst,
Thank you for the reply.
I have changed the code as per your suggestion however i'm not able to transfer the data through the uart.

could you please let me know whether the hardware connections are right or not. The hardware connections are as given below:
1. J7 header, PK0 & PK1 to max3232 RX & TX.
2. I have not changed jumper settings. I have placed as it is in default condition(as per the datasheet).
3.through xds usb i am flashing the code.
4.I have placed JP1 jumper to XDS.

Regards,
Kalyan.

0 Sven Probst over 7 years ago in reply to kalyan

Expert 1630 points

Hi Kalyan,

I just tried the following modification of the uartecho example and it worked:

/* UART configuration structure */
const UARTMSP432E4_HWAttrs uartMSP432E4HWAttrs[MSP_EXP432E401Y_UARTCOUNT] = {
    {
        //.baseAddr = UART0_BASE,
        .baseAddr = UART4_BASE,
        //.intNum = INT_UART0,
        .intNum = INT_UART4,
        .intPriority = (~0),
        .flowControl = UARTMSP432E4_FLOWCTRL_NONE,
        .ringBufPtr = uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0],
        .ringBufSize = sizeof(uartMSP432E4RingBuffer[MSP_EXP432E401Y_UART0]),
        //.rxPin = UARTMSP432E4_PA0_U0RX,
        .rxPin = UARTMSP432E4_PK0_U4RX,
        //.txPin = UARTMSP432E4_PA1_U0TX,
        .txPin = UARTMSP432E4_PK1_U4TX,
        .ctsPin = UARTMSP432E4_PIN_UNASSIGNED,
        .rtsPin = UARTMSP432E4_PIN_UNASSIGNED,
        .errorFxn = NULL
    }
};

const UART_Config UART_config[MSP_EXP432E401Y_UARTCOUNT] = {
    {
        .fxnTablePtr = &UARTMSP432E4_fxnTable,
        .object = &uartMSP432E4Objects[MSP_EXP432E401Y_UART0],
        .hwAttrs = &uartMSP432E4HWAttrs[MSP_EXP432E401Y_UART0]
    }
};

PK0 is the receive input of the processor. It has to be connected to the ROUT output of max3232.

PK1 is the transmit output of the processor. It has to be connected to the DIN input of max3232.

You could also use the virtual com port of the XDS110. See image:

0 Sven Probst over 7 years ago in reply to Sven Probst

Expert 1630 points

Hi Kalyan,

one more thing just to be sure: max3232 ground and the MSP-EXP432E401Y ground must be connected. max3232 ground and D-Sub connector ground must be connected, too.

0 kalyan over 7 years ago in reply to Sven Probst

Expert 1705 points

Dear Sven Probst,
Thank you for the continuous support sir.
Finally it is working. Actually one of the soldering contact was gone bad in the max3232 to D type side.

Thank you
Regards
Kalyan.

0 kalyan over 7 years ago in reply to Sven Probst

Expert 1705 points

Dear Sven Probst,
Thank you for the continuous support.
Finally it is working.
Actually one of the soldering joint gone bad in the max3232 to D type side.

Thank you
Regards
Kalyan.

0 kalyan over 7 years ago in reply to Sven Probst

Expert 1705 points

Thank you Sven Probst.

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RTOS/MSP432E401Y: MSP432E401Y UART HARDWARE CONNECTION