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器件型号：MSP430F2272 您好 MSP430论坛。
正如标题所述、在一个 START 条件之后、当 MSP 处于主控模式并且接收到一个来自从器件的消息时、代码执行会一直进入 TX ISR、即使 TX 中断被禁用(IE2 = UCB0RXIE)。 当处于 主控模式且正在传输消息时、一切都正常！
在主器件侧有一个 MSP430F2272、在从器件侧有一个 SHT30-DIS。
下面是我的代码片段：
//-----------------------------------------------------------------------
// PORT3 configuration
//
P3REN &= ~(I2C_SDA | I2C_SCL); //I2C_SDA == 0x02, I2C_SCL == 0x04
P3DIR |= (I2C_SCL);
P3SEL |= (I2C_SDA | I2C_SCL);
//-----------------------------------------------------------------------
// I2C configuration
//
UCB0I2CSA = SHT3X_I2C_ADDRESS; // I2C slave Address. The I2CSAx bits contain the slave address of the ;
UCB0CTL1 |= UCTR; // UCTR=1 => Transmit Mode (R/W bit = 0)
IFG2 &= ~(UCB0TXIFG | UCB0RXIFG); // Clear Interrupt flags
IE2 &= ~UCB0RXIE; // disable Receive ready interrupt
IE2 |= UCB0TXIE; // enable Transmit ready interrupt
//-----------------------------------------------------------------------
// Send Measurement command to slave device
//
//Send START condition
UCB0CTL1 |= UCTXSTT; // Send start. Transmit START condition in master mode.
__delay_cycles(5);
//Send MSB
IFG2 &= ~UCB0TXIFG;
UCB0TXBUF = SHT3X_MEAS_TEMP_MSB; // Send MSB to device
__bis_SR_register(LPM3_bits + GIE); // Wait till Tx interrupt occur
//Send LSB
IFG2 &= ~UCB0TXIFG;
UCB0TXBUF = SHT3X_MEAS_TEMP_LSB; // Send LSB to device
__bis_SR_register(LPM3_bits + GIE); // Wait till Tx interrupt occur
//Send STOP condition
UCB0CTL1 |= UCTXSTP; // Send STOP condition to slave knows that data transfer ended
while((UCB0CTL1 & UCTXSTP)); // 2 ensure STOP was send
//Put Master in RECEIVE status
UCB0CTL1 &= ~UCTR; // UCTR=0 => Receive Mode (R/W bit = 1)
IFG2 &= ~(UCB0RXIFG | UCB0TXIFG); //UCB0RXIFG is set when UCB0RXBUF has received a complete character
IE2 &= ~(UCB0TXIE); // disable Transmit ready interrupt
IE2 |= UCB0RXIE; // enable Receive ready interrupt
//Send START condition to slave send data
//Slave clock streching is enabled
UCB0CTL1 |= UCTXSTT; // Send start. Transmit START condition in master mode.
__delay_cycles(5);
//Just a loop 2 know when NACK & STOP should be sent
for(i=BYTES2RECEIVE; i > 0; i--)
{
__bis_SR_register(LPM3_bits + GIE);
if(!(i-1))
{
UCB0CTL1 |= UCTXNACK; // Send NACK condition
__delay_cycles(5);
UCB0CTL1 |= UCTXSTP; // Send STOP condition to slave knows that data transfer ended
while((UCB0CTL1 & UCTXSTP));
}
}
//TRANSMIT ISR
#pragma vector=USCIAB0TX_VECTOR
__interrupt void USCIABTX_ISR(void)
{
if((IFG2 & UCA0TXIFG))
IFG2 &= ~UCA0TXIFG;
if((IFG2 & UCB0TXIFG))
IFG2 &= ~UCB0TXIFG;
__bic_SR_register_on_exit(LPM3_bits); // EXIT LPM3
}
//RECEIVE ISR
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCIABRX_ISR(void)
{
if((IFG2 & UCB0RXIFG))
{
RXData[i-1] = UCB0RXBUF; // Get RX data
IFG2 &= ~UCB0RXIFG;
}
__bic_SR_register_on_exit(LPM3_bits); // Exit LPM3
}
我能够在示波器上看到应该发送和接收到从器件的数据。 一切都很好、除了我的程序 不断进入 和退出 TX ISR。 当我暂停程序执行并禁用 RX 中断时、不会进入 TX ISR。
有什么想法吗？
提前感谢！
