To set or clear the IOLOCK bit, an unlock sequence must be executed:
#define PPSUnLock() {SYSKEY=0x0; SYSKEY=0xAA996655; SYSKEY=0x556699AA; CFGCONbits.IOLOCK=0;}
#define PPSLock() {SYSKEY=0x0; SYSKEY=0xAA996655; SYSKEY=0x556699AA; CFGCONbits.IOLOCK=1;}
Note these defines are likely already included in xc32
UART
DISABLE_INT;
PPSUnLock() //PPS Unlock (required before setting peripheral pin, if config bit IOL1WAY is set only 1 change of IOLOCK is permitted)
//Input
U1RXRbits.U1RXR = 0x04; //RPB2
//Output
CFGCONbits.IOLOCK = 0;
RPB3Rbits.RPB3R = 0x01; //U1TX
PPSLock(); //PPS Lock
ENABLE_INT; //<<<if irqs have been set!
SPI
//----- SPI2 -----
DISABLE_INT;
PPSUnLock() //PPS Unlock (required before setting peripheral pin, if config bit IOL1WAY is set only 1 change of IOLOCK is permitted)
//Input
SDI2Rbits.SDI2R = 0x03; //RPD11
//Output
RPB3Rbits.RPB3R = 0x06; //SDO2
PPSLock(); //PPS Lock
ENABLE_INT; //<<<if irqs have been set!
USEFUL?
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