User manual

Basys MX3™ Board Reference Manual

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Page 31 of 56

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

PIC32 pin

Needed mapping for SPI1

SPI_CE

RPF8/RF8

SPI_SI

RPF2/RF2

RPF2R = 0x08; // SDO1 – RF2

SPI_SO

RPF7/RF7

SDI1R = 0x0F; // SDI1 – RF7

SPI_SCK

SCK

RPF6/SCK1/INT0/RF6

Table 12.2. Flash connectivity.

12.2 Functionality

To use the flash memory, the SPI pins must be properly configured to implement SPI1 functions (see Section 12.1

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

Figure 13.1. UART schematic diagram.

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.