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AN-1590
SPI Driver Functions
Only one SPI function is used, trx8bits_8, shown the figure below:
Only single-byte transfers are used on the HI-1590, this HI-1590 SPI driver function is included in the
Driver.c module and its Driver.h header file. The MCU slave select pin SSO (not nCS) is connected to the
HI-1590 nCS pin.
Uart.c Serial Port
The drivers supporting the USB serial port (console) are contained in this module. Some function drivers
allow messages to be sent and received on the UART. This is useful to log status or data messages on
HyperTerminal or any other terminal program. It currently uses polling to determine when the data
receive or transmit registers can be read or written.
14
Holt Integrated Circuits
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