UART2RX PIC24FV16KM202上没有触发中断

嗨，我正试图通过UART 2与RN2443模块进行对话，并且我使用UART 1进行调试（使用PC上的CuteCoM），发生的是，我向模块发送命令，模块响应（我看到使用范围的在线上的响应），但是UART2RX中断没有关闭。这是奇怪的，因为当我使用相同的代码（除了UART 1），中断工作，我可以收到我的答复。由于两个UART的初始化都是相同的，所以我不知道问题是什么。Edj:我注意到现在中断了，但是它退出了中断，因为U2Stest.FER被设置了。在我可以像平常一样解码消息的范围内，所有的比特似乎都在这里，所以问题实际上变成：为什么U2Stest.FER设置为我接收的所有字节？没有一个字节通过。这只发生在来自微芯片的RN2443模块的接收消息上。当我在EDIti AM的UART一端发送消息到设备上时，在PIC24FV16KM202控制器上使用UART2和UART 1都不会发生这种情况。PIC24通过发现HTTP：//www. McCudio.com……ASPX与我的PC连接。PARNONO＝DMS24013-2。这里，我使用初始化I/O的代码：现在我分别用代码初始化我的UART：中断对于UART来说是完全相同的，见下文；



      以下为原文

    Hi,

I am trying to talk to a RN2483 module through UART 2, and I use UART 1 for debugging (using cutecom on pc)
What happens is that I send a command to the module, the module responds (I see the response on the line using a scope), but the UART2RX interrupt doesn't go off. This is strange because when I use the same code (except for UART 1) the interrupt does work and I can receive my response. As the initialization for both UART are the same, I have no clue what the problem is.

EDIT:
I noticed now the interrupt does trigger, but it exits the interrupt right away because the U2STAbits.FERR is set. On the scope i can decode the message like normal, all bits seem to be here, so the question really turns into: Why is U2STAbits.FERR set for ALL BYTES i receive? Not a single byte comes through.
This only occurs on the received messages from the RN2483 module from Microchip. This doesn't occur when I send messages to the device from my PC on uart 1.
END OF EDIT

I am using both UART2 and UART 1 on the PIC24FV16KM202 controller. The PIC24 is connected with my PC through the programmer found http://www.microchip.com/...aspx?PartNO=DM240013-2 here.

The code i use for initializing my I/O:


ANSA = 0x0000; // set pin mode to digital
TRISA = 0x0000; // set pin function all to output
ANSAbits.ANSA2 = 1; // RA2 = OSCI
TRISAbits.TRISA2 = 1; // RA2 = OSCI

LATBbits.LATB0 = 1; // master TX
LATBbits.LATB7 = 1; // Diver TX

// set pin function PORT B (input = 1 / output = 0) //

ANSB = 0x0000; // set pin mode to digital


HLVDCONbits.HLSIDL = 1;

//TRISB = 0xFFFF; // set pin function all to output
TRISBbits.TRISB0 = 0;
TRISBbits.TRISB7 = 0;
TRISBbits.TRISB13 = 0; // RB13 = reset pin (Output)

IFS1 = 0x0000; // Reset all interrupts
IFS2 = 0x0000; // Reset all interrupts
IFS3 = 0x0000; // Reset all interrupts
IFS4 = 0x0000; // Reset all interrupts
IFS5 = 0x0000; // Reset all interrupts
IFS6 = 0x0000; // Reset all interrupts
INTTREG = 0b0000000000000000;



Now I initialize both my uarts respectively with the code:


void init_rn2483_uart()

{

U2MODEbits.UARTEN = 1; // Enable UART
U2MODEbits.STSEL = 0; // 1-stop bit
U2MODEbits.PDSEL = 0; // No Parity, 8-data bits
U2MODEbits.ABAUD = 0; // Auto-Baud disabled
U2MODEbits.BRGH = 0; // Standard-Speed mode
U2MODEbits.WAKE = 0; // Wake up after start bit
U2BRG = BAUD_TO_BRG(9600);
U2MODEbits.USIDL = 1; // Stop in idle mode
U2MODEbits.UEN = 0; // Only use TX and RX
U2STAbits.URXISEL = 1; // Interrupt after a RX character is received;
U2STAbits.UTXISEL0 = 1; // UARTx Transmission Interrupt Mode = Interrupt when the last character is shifted out of the Transmit Shift Register;
U2STAbits.UTXISEL1 = 0;
IEC1bits.U2TXIE = 0; // Disable UART TX interrupt
IEC1bits.U2RXIE = 1; // Enable UART RX interrupt
IPC7bits.U2TXIP = 5; // UART interrupt priority (0 = lowest, 7 = highest)
U2STAbits.UTXEN = 1; // Enable UART TX

}



void init_debug_uart()

{

U1MODEbits.STSEL = 0; // 1-stop bit
U1MODEbits.PDSEL = 0; // No Parity, 8-data bits
U1MODEbits.ABAUD = 0; // Auto-Baud disabled
U1MODEbits.BRGH = 0; // Standard-Speed mode
U1MODEbits.WAKE = 0; // Wake up after start bit
U1BRG = BAUD_TO_BRG(baudrate);
U1MODEbits.USIDL = 1; // ???? in idle mode
U1MODEbits.UEN = 0; // Only use TX and RX
U1STAbits.URXISEL = 1; // Interrupt after a RX character is received;
U1STAbits.UTXISEL0 = 1; // UARTx Transmission Interrupt Mode = Interrupt when the last character is shifted out of the Transmit Shift Register;
U1STAbits.UTXISEL1 = 0;
IEC0bits.U1TXIE = 0; // Disable UART TX interrupt
IEC0bits.U1RXIE = 1; // Enable UART RX interrupt
IPC3bits.U1TXIP = 5; // UART interrupt priority (0 = lowest, 7 = highest)
U1MODEbits.UARTEN = 1; // Enable UART
U1STAbits.UTXEN = 1; // Enable UART TX

}



The interrupt is exactly the same for both uarts, see below;


void _ISR __attribute__((no_auto_psv)) _U1RXInterrupt(void)
{
IFS0bits.U1RXIF = 0; // Clear Interrupt flag

if(U1STAbits.FERR == 1) { // Framing error
U1STAbits.FERR = 0;
return;
}

rx_in_debug = (U1RXREG & 0xFF); // Store char in buffer

if(U1STAbits.OERR == 1) {
U1STAbits.OERR = 0; // Reset error
}
}



void _ISR __attribute__((no_auto_psv)) _U2RXInterrupt(void)
{
IFS1bits.U2RXIF = 0; // Clear RX Interrupt flag
if(U2STAbits.FERR == 1) { // Framing error
U2STAbits.FERR = 0;
return;
}

rx_in = (U2RXREG & 0xFF); // Store char in buffer

if(U2STAbits.OERR == 1) {
U2STAbits.OERR = 0; // Reset error
}
}