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MSP432P401R: Initialize the P6.7 pin to the PWM function of TA2.4, affecting the SPI receiving data of UCB3

shangbing zhong
Prodigy 10 points

Part Number: MSP432P401R

Hi  Team

Use the SPI function of the UCB3 module: configure P10.3 as SOMI, P10.2 as SIMO, P10.1 as SCK; clock frequency is 12M;

The initialization code is as follows：

P10SEL1 &= ~(BIT2+ BIT3);

P10SEL0 |= (BIT2+ BIT3);

P10SEL0 |= (BIT1);

P10SEL1 &= ~(BIT1);

P10DIR |=  BIT1;

P10SEL0 &= ~(BIT0);

P10SEL1 &= ~(BIT0);

P10DIR |=  BIT0;

P9SEL0 &= ~(BIT7);

P9SEL1 &= ~(BIT7);

P9DIR |=  BIT7;

UCB3CTLW0 |= UCSWRST;

UCB3CTLW0 |= (UCMST + UCSYNC  + UCMSB+  UCCKPL);    

UCB3CTLW0 |= UCSSEL_2;

UCB3BRW = 2;

UCB3CTLW0 &= ~UCSWRST;

TA2.4 is configured as PWM function, output pin P6.7, configuration output function first basic function; output frequency 100Hz, counting mode 2;

The initialization code is as follows：

    P6SEL0 |= BIT7;

P6SEL1 &= ~BIT7;

P6DIR |= BIT7;

P6OUT |= BIT7;

TA2CTL &= ~(MC1 + MC0 ) ;

 

TA2CTL |= TASSEL_2 + TACLR + ID_3;

TA2CCR0 = SMCLK / 800;

TA2CCR4 = 0x0;

TA2CCTL4 = OUTMOD_2; 

TA2CTL |= MC0;

In the case that the PWM function is not initialized, the SPI operation is normal; however, after the PWM is initialized, the read data of the SPI is always 0xff;

May i know what is this all about?

Thanks

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