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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
}
}
