- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
Hello,
I have trouble receiving data from my FRAM Board. My FG4618 should send 'a' over the SPI bus while my FR5739 echos the data back. If my FG4618 receives 'a' it should power up the LED. For some reason I am able so send the 'a' over SPI but does not receive it back. Here the Code of both of them:
FG4618:
#include <msp430.h>
unsigned char MST_Data, SLV_Data;
int main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
FLL_CTL0 |= XCAP14PF; // Configure load caps
P2DIR = 0xFF;
// Wait for xtal to stabilize
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0x47FF; i > 0; i--)
; // Time for flag to set
} while ((IFG1 & OFIFG)); // OSCFault flag still set?
for (i = 2100; i > 0; i--)
; // Now with stable ACLK, wait for
// DCO to stabilize.
P5OUT = 0x04; // P5 setup for LED and slave reset
P5DIR |= 0x06; //
P7SEL |= 0x0E; // P7.3,2,1 option select
UCA0CTL0 |= UCMST + UCSYNC + UCCKPL + UCMSB; //3-pin, 8-bit SPI master
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 0x02; // /2
UCA0BR1 = 0; //
UCA0MCTL = 0; // No modulation
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt
P5OUT &= ~0x04; // Now with SPI signals initialized,
P5OUT |= 0x04; // reset slave
P5OUT &= ~0x02;
while (!(IFG2 & UCA0TXIFG)); // USART1 TX buffer ready?
UCA0TXBUF = 'a'; // Transmit character
while (1)
{
// P2OUT ^= 0x02; // Toggle P2.0 using exclusive-OR
//
// i = 10000; // SW Delay
// do
// i--;
// while (i != 0);
__delay_cycles(1000000);
}
// __bis_SR_register(LPM0_bits + GIE);
__bis_SR_register(GIE);
// CPU off, enable interrupts
}
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCIA0RX_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCIAB0RX_VECTOR))) USCIA0RX_ISR (void)
#else
#error Compiler not supported!
#endif
{
volatile unsigned int i;
while (!(IFG2 & UCA0TXIFG)) // USART1 TX buffer ready?
;
if (UCA0RXBUF == 'a') // Test for correct character RX'd
P2OUT |= 0x02; // If correct, light LED
else
P2OUT &= ~0x02; // If incorrect, clear LED
// MST_Data++; // Increment data
// SLV_Data++;
// UCA0TXBUF = MST_Data; // Send next value
for (i = 100; i > 0; i--)
; // Add time between transmissions to
} // make sure slave can keep up
For FR5739:
#include <msp430.h>
typedef enum {
NO_LED, LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8
} ledEnum;
void turnLedOn(char ledNum);
void turnLedOff(char ledNum);
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
P3DIR = 0xFF;
// Configure XT1
PJSEL0 |= BIT4 + BIT5;
CSCTL0_H = 0xA5;
CSCTL1 |= DCOFSEL0 + DCOFSEL1; // Set max. DCO setting
CSCTL2 = SELA_0 + SELS_3 + SELM_3; // set ACLK = XT1; MCLK = DCO
CSCTL3 = DIVA_0 + DIVS_3 + DIVM_3; // set all dividers
CSCTL4 |= XT1DRIVE_0;
CSCTL4 &= ~XT1OFF;
do
{
CSCTL5 &= ~XT1OFFG;
// Clear XT1 fault flag
SFRIFG1 &= ~OFIFG;
} while (SFRIFG1 & OFIFG); // Test oscillator fault flag
// Configure SPI pins
P1SEL1 |= BIT5;
P2SEL1 |= BIT0 + BIT1;
UCA0CTLW0 |= UCSWRST; // **Put state machine in reset**
UCA0CTLW0 |= UCSYNC + UCCKPL + UCMSB; // 3-pin, 8-bit SPI slave
// Clock polarity high, MSB
UCA0CTLW0 |= UCSSEL_2; // ACLK
UCA0BR0 = 0x02; // /2
UCA0BR1 = 0; //
UCA0MCTLW = 0; // No modulation
UCA0CTLW0 &= ~UCSWRST; // **Initialize USCI state machine**
UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt
turnLedOff(6);
turnLedOff(7);
turnLedOff(8);
// __bis_SR_register(LPM0_bits + GIE);
__bis_SR_register(GIE);
while(1)
{
turnLedOn(5);
__delay_cycles(1000000);
turnLedOff(5);
__delay_cycles(1000000);
}
// Enter LPM0, enable interrupts
}
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
while (!(UCA0IFG & UCTXIFG))
; // USCI_A0 TX buffer ready?
if(UCA0RXBUF=='a')
{
UCA0TXBUF = UCA0RXBUF; // Echo received data
P3OUT ^= (BIT6);
}
}The shematic is:
MSP430FG4618:
P7.1|-> Data Out (UCA0SIMO)
P7.2|<- Data In (UCA0SOMI)
P7.3|-> Serial Clock Out (UCA0CLK)
MSP430FR5739:
P4.3|<- Data In (SIMO1)
P4.4|-> Data Out (SOMI1)
P4.5|<- Serial Clock In (UCLK1)
I would appreciate any help. Either the FRAM board does not send anything back. Or the MSP430FG4618 does not receive anything...
regards
**Attention** This is a public forum
