NOTE regarding JTAG on Philips LPC

If JTAG is enabled on the chip, then all of pins P0.22 thru P0.31 are disabled, and taken over by ETM which you can't disable.

Various PINSEL settings for non-gpio functions:

Uart0: PINSEL0 0x00000005 i2c: 0x00000050 spi: 0x00005500