求助：dsPIC33FJ32**的串口Tx到底是哪个管脚？
如题，看了Pic的手册，没有找到啊。 仔细看，不可能没有的，什么型号啊 看看是不是用PPS定義所以沒寫。 问题已经解决，型号：dsPIC33FJ32MC204，手册上确实没有标明哪个是默认的TX引脚。需要另行配置的。代码如下：//波特率9600 8位数据 1位停止位 无校验
void init_UART()
{
//uart1 IO set
TRISB = (1 << 3);
RPINR18bits.U1RXR = 3; //uart1-rxd----RP3 RB3
RPOR2bits.RP4R = 3; //TX RP4--RB4
U1MODEbits.UARTEN = 0; // Bit15 TX, RX DISABLED, ENABLE at end of func
//U2MODEbits.notimplemented; // Bit14
U1MODEbits.USIDL = 0; // Bit13 Continue in Idle
U1MODEbits.IREN = 0; // Bit12 No IR translation
U1MODEbits.RTSMD = 0; // Bit11 Simplex Mode
//U2MODEbits.notimplemented; // Bit10
U1MODEbits.UEN = 0; // Bits8,9 TX,RX enabled, CTS,RTS not
U1MODEbits.WAKE = 0; // Bit7 No Wake up (since we don't sleep here)
U1MODEbits.LPBACK = 0; // Bit6 No Loop Back
U1MODEbits.ABAUD = 0; // Bit5 No Autobaud (would require sending '55')
U1MODEbits.URXINV = 0; // Bit4 IdleState = 1(for dsPIC)
U1MODEbits.BRGH = 0; // Bit3 16 clocks per bit period
U1MODEbits.PDSEL = 0; // Bits1,2 8bit, No Parity
U1MODEbits.STSEL = 0; // Bit0 One Stop Bit
// Load a value into Baud Rate Generator.Example is for 9600.
// See section 19.3.1 of datasheet.
//U2BRG = (Fcy/(16*BaudRate))-1
//U2BRG = (37M/(16*9600))-1
//U2BRG = 240
U1BRG = FCY/9600/16 - 1; //24-1
// Load all values in for U1STA SFR
U1STAbits.UTXISEL1 = 0; //Bit15 Int when Char is transferred (1/2 config!)
U1STAbits.UTXINV = 0; //Bit14 N/A, IRDA config
U1STAbits.UTXISEL0 = 0; //Bit13 Other half of Bit15
//U2STAbits.notimplemented = 0; //Bit12
U1STAbits.UTXBRK = 0; //Bit11 Disabled
U1STAbits.UTXEN = 0; //Bit10 TX pins controlled by periph
U1STAbits.UTXBF = 0; //Bit9 *Read Only Bit*
U1STAbits.TRMT = 0; //Bit8 *Read Only bit*
U1STAbits.URXISEL = 0; //Bits6,7 Int. on character recieved
U1STAbits.ADDEN = 0; //Bit5 Address Detect Disabled
U1STAbits.RIDLE = 0; //Bit4 *Read Only Bit*
U1STAbits.PERR = 0; //Bit3 *Read Only Bit*
U1STAbits.FERR = 0; //Bit2 *Read Only Bit*
U1STAbits.OERR = 0; //Bit1 *Read Only Bit*
U1STAbits.URXDA = 0; //Bit0 *Read Only Bit*
IPC2bits.U1RXIP = 3; //interupt priority is 3
IEC0bits.U1RXIE = 1; //RX interrupt enable
IFS0bits.U1RXIF = 0; //clear RX int flag
U1MODEbits.UARTEN = 1; // And turn the peripheral on
U1STAbits.UTXEN = 1;
// I think I have the thing working now.
}
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