Functionality; Uart - Digilent Basys MX3 Reference Manual

Basys MX3™ Board Reference Manual
The SPI_CE, SPI_SCK, and SPI_SI pins should be configured as digital output, while the SPI_SO pin must be
configured as digital input.
Name Label on J6
SPI_CE CE
SPI_SI SI
SPI_SO SO
SPI_SCK SCK

12.2 Functionality

To use the flash memory, the SPI pins must be properly configured to implement SPI1 functions (see
above). Then, proper SPI communication (read, write) must be implemented over SPI1. The SPI1 interface must be
initialized and then accessed through read and write functions.
Flash communication is implemented in the SPIFLASH library of the Basys MX3 library pack. If a user wants to use
the SPI flash without the SPIFLASH library, they must implement their own SPI functions.
Note that users can visualize the communication with the SPI flash using a connector labeled SPI (J6), located on
the back of the board under PMOD A connector.

13 UART

The PIC32MX370F512L microcontroller provides five UART interfaces: UART1, UART2, ..., UART5. Each UART can
provide either a 2-wire or a 4-wire asynchronous serial interface. The 2-wire interface uses only receive (RX) and
transmit (TX) signals. The 4-wire interface includes request-to-send (RTS) and clear-to-send (CTS) in addition to
receive and transmit signals.
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PIC32 pin
RPF8/RF8
RPF2/RF2
RPF7/RF7
RPF6/SCK1/INT0/RF6
Table 12.2. Flash connectivity.
Figure 13.1. UART schematic diagram.
Needed mapping for SPI1
RPF2R = 0x08; // SDO1 – RF2
SDI1R = 0x0F; // SDI1 – RF7
Section 12.1
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