REQUIRES: Core 3.00.00 or above

pi peripheral enable
nextreg 0xa0
0 0 RXTX UART I2C1 0 0 SPI0
 UART = 1 changes role of GPIO 14,15 (gpio output is disabled)
 RXTX = 0 to connect Rx to GPIO 15, TX to GPIO 14 (for comm with pi hats)
        1 to connect Rx to GPIO 14, TX to GPIO 15 (for comm with pi)
 I2C1 = 1 changes role of GPIO 2,3 (gpio output is disabled)
 SPI0 = 1 changes role of GPIO 7,8,9,10,11 (gpio output is disabled)
