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器件型号:MSP430G2553 主题中讨论的其他器件:MSP430G2533
工具与软件:
大家好、我正尝试通过 SPI 将一个十六进制值从 MSP430G2533 (我们称之为 MSP430发送器)发送到另一个 MSP430G2533 (我们称之为 MSP430接收器)。
我能够在调试器视图中发送和查看 MSP430发送器上 TX 缓冲区上的十六进制值。 但是、我的 MSP430接收器无法获得缓冲器。 以下是我的代码
SPI 接收代码:
#include <msp430.h> void setupSPI_Slave() { // Set UCSWRST (USCI Software Reset) UCB0CTL1 = UCSWRST; // Set USCI_B0 to slave mode, 3-pin SPI, synchronous mode UCB0CTL0 = UCSYNC + UCCKPL + UCMSB; // Clear UCSWRST to release USCI_B0 for operation UCB0CTL1 &= ~UCSWRST; // Enable USCI_B0 RX interrupt IE2 |= UCB0RXIE; } int main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer P1SEL |= BIT5 + BIT6 + BIT7; // Set P1.5, P1.6, P1.7 as SPI pins P1SEL2 |= BIT5 + BIT6 + BIT7; setupSPI_Slave(); __bis_SR_register(GIE); // Enable global interrupts while (1) { __bis_SR_register(LPM0_bits + GIE); } } // USCI_B0 Data ISR #pragma vector=USCIAB0RX_VECTOR __interrupt void USCI0RX_ISR(void) { if (IFG2 & UCB0RXIFG) { unsigned char receivedData = UCB0RXBUF; // Read received data // Do something with the received data __bic_SR_register_on_exit(LPM0_bits); // Exit low-power mode } }
SPI 传输代码:
#include <msp430.h> void setupSPI_Master() { // Set UCSWRST (USCI Software Reset) UCB0CTL1 = UCSWRST; // Set USCI_B0 to master mode, 3-pin SPI, synchronous mode UCB0CTL0 = UCMST + UCSYNC + UCCKPL + UCMSB; // SMCLK as clock source UCB0CTL1 |= UCSSEL_2; // Set baud rate (UCB0BR0 and UCB0BR1) UCB0BR0 = 0x02; UCB0BR1 = 0; // Clear UCSWRST to release USCI_B0 for operation UCB0CTL1 &= ~UCSWRST; // Enable USCI_B0 RX interrupt IE2 |= UCB0RXIE; } void sendSPI_Master(unsigned char data) { while (!(IFG2 & UCB0TXIFG)); // Wait for TX buffer to be ready UCB0TXBUF = data; // Send data } int main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer P1SEL |= BIT5 + BIT6 + BIT7; // Set P1.5, P1.6, P1.7 as SPI pins P1SEL2 |= BIT5 + BIT6 + BIT7; P1DIR |= BIT4; // Set P1.4 as output (CS pin) P1OUT |= BIT4; // Set P1.4 high (CS idle high) setupSPI_Master(); while (1) { P1OUT &= ~BIT4; // Pull CS low to start communication sendSPI_Master(0xFF); P1OUT |= BIT4; // Set CS high to end communication __delay_cycles(1000); // Delay between transmissions } }