MSP432P4111: msp432p4111

sasi kumar1

Expert 1120 points

Part Number: MSP432P4111

Hi,

Kindly find the schematic

from the schematic, we use UCB3SOMI & UCB3SIMO for both "SPI" & "I2C"

"SPI" initializing code:

void SPI2_Init(void)
{
P10->SEL0 |= BIT1 | BIT2 | BIT3; // Set P10.1 - SCK, P10.2 - SDO, P10.3 - SDI

EUSCI_B3->CTLW0 |= EUSCI_B_CTLW0_SWRST; // Put eUSCI state machine in reset
EUSCI_B3->CTLW0 |= EUSCI_B_CTLW0_MST;
EUSCI_B3->CTLW0 |= EUSCI_B_CTLW0_SYNC;
EUSCI_B3->CTLW0 |= EUSCI_B_CTLW0_MSB;
EUSCI_B3->CTLW0 |= EUSCI_B_CTLW0_CKPL
EUSCI_B3->CTLW0 |= EUSCI_B_CTLW0_SSEL__ACLK;
EUSCI_B3->BRW = 0x01; // /2,fBitClock = fBRCLK/(UCBRx+1).
EUSCI_B3->CTLW0 &= ~EUSCI_B_CTLW0_SWRST;// Initialize USCI state machine
EUSCI_B3->IE |= EUSCI_B_IE_TXIE; // Enable TX interrupt

__enable_irq(); // Enable global interrupt

I2C initializing code:

void I2C_init(void)
{

MAP_I2C_initMaster(EUSCI_B3_BASE, &i2cConfig);

EUSCI_B_I2C_setSlaveAddress(EUSCI_B3_BASE,
0x55);

MAP_I2C_disableModule(EUSCI_B3_BASE);

MAP_I2C_enableModule(EUSCI_B3_BASE);

}

here SPI gets initialized first and data gets transmitted when I2C initialization takes place both SPI and I2C protocols stop working, whereas when they are in the separate project they work fine,

While in SPI protocol when clock polarity is set to zero, I2C works but SPI stops transmitting

over 5 years ago

0 Dennis Lehman over 5 years ago

TI__Guru 71216 points

Hi Sasi,

This sounds like the peripheral is not going through a full reset (similar to what would happen at POR).

What happens if you initialize the I2C first then SPI?

What happens if you initialize for SPI transmit some data, then re-initialize for SPI and transmit?

0 sasi kumar1 over 5 years ago in reply to Dennis Lehman

Expert 1120 points

Hi Dennis,

When I2C is initialized first both the functions are not working

SPI works in both MODE 1(phase 0 & polarity 1), MODE 2(phase 1 & polarity 0) and doesn't work in MODE 0 & MODE3

when working in MODE 1;

SPI initially initialized transmits data after the initialization of I2C both functions fail, then re-initializing SPI does not transmit data.

when working in MODE 2;

SPI initially initialized transmits data and I2C also transmits data after that SPI fails, then re-initializing SPI does not transmit data.

0 Dennis Lehman over 5 years ago in reply to sasi kumar1

TI__Guru 71216 points

Hi sasi,

I have contacted the product engineer to see if he knows why this is happening.

0 sasi kumar1 over 5 years ago in reply to Dennis Lehman

Expert 1120 points

Hi Dennis,

I tried resetting the SPI with UCSWRST and I2C with UCSWRST even then reinitializing the SPI is not possible

0 Dennis Lehman over 5 years ago in reply to sasi kumar1

TI__Guru 71216 points

Hi sasi,

Unfortunately, according to our design team, the EUSCI module requires a POR (power cycle) to completely reset the peripheral before selecting its mode of operation and just setting the USCWRST is not sufficient. There is no work around.

0 sasi kumar1 over 5 years ago in reply to Dennis Lehman

Expert 1120 points

Hi Dennis,

Is there any alternate microcontroller for MSP432P4111 that supports both I2C and SPI of same bank which can run parallely

0 Dennis Lehman over 5 years ago in reply to sasi kumar1

TI__Guru 71216 points

Hi Sasi,

Unfortunately no. Not within the MSP family.

0 Dennis Lehman over 5 years ago in reply to Dennis Lehman

TI__Guru 71216 points

Hello Sasi,

I'll assume you were able to resolve your issue so I will go ahead and close this thread.
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MSP432P4111: msp432p4111