Embedded Peripherals IP User Guide

ID 683130
Date 12/13/2021
Public

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Document Table of Contents
1. Introduction 2. Avalon® -ST Multi-Channel Shared Memory FIFO Core 3. Avalon® -ST Single-Clock and Dual-Clock FIFO Cores 4. Avalon® -ST Serial Peripheral Interface Core 5. SPI Core 6. SPI Agent/JTAG to Avalon® Host Bridge Cores 7. Intel eSPI Agent Core 8. eSPI to LPC Bridge Core 9. Ethernet MDIO Core 10. Intel FPGA 16550 Compatible UART Core 11. UART Core 12. JTAG UART Core 13. Intel FPGA Avalon® Mailbox Core 14. Intel FPGA Avalon® Mutex Core 15. Intel FPGA Avalon® I2C (Host) Core 16. Intel FPGA I2C Agent to Avalon® -MM Host Bridge Core 17. Intel FPGA Avalon® Compact Flash Core 18. EPCS/EPCQA Serial Flash Controller Core 19. Intel FPGA Serial Flash Controller Core 20. Intel FPGA Serial Flash Controller II Core 21. Intel FPGA Generic QUAD SPI Controller Core 22. Intel FPGA Generic QUAD SPI Controller II Core 23. Interval Timer Core 24. Intel FPGA Avalon FIFO Memory Core 25. On-Chip Memory (RAM and ROM) Intel FPGA IP 26. On-Chip Memory II (RAM or ROM) Intel FPGA IP 27. Optrex 16207 LCD Controller Core 28. PIO Core 29. PLL Cores 30. DMA Controller Core 31. Modular Scatter-Gather DMA Core 32. Scatter-Gather DMA Controller Core 33. SDRAM Controller Core 34. Tri-State SDRAM Core 35. Video Sync Generator and Pixel Converter Cores 36. Intel FPGA Interrupt Latency Counter Core 37. Performance Counter Unit Core 38. Vectored Interrupt Controller Core 39. Avalon® -ST Data Pattern Generator and Checker Cores 40. Avalon® -ST Test Pattern Generator and Checker Cores 41. System ID Peripheral Core 42. Avalon® Packets to Transactions Converter Core 43. Avalon® -ST Multiplexer and Demultiplexer Cores 44. Avalon® -ST Bytes to Packets and Packets to Bytes Converter Cores 45. Avalon® -ST Delay Core 46. Avalon® -ST Round Robin Scheduler Core 47. Avalon® -ST Splitter Core 48. Avalon® -MM DDR Memory Half Rate Bridge Core 49. Intel FPGA GMII to RGMII Converter Core 50. Intel FPGA MII to RMII Converter Core 51. Intel FPGA HPS GMII to TSE 1000BASE-X/SGMII PCS Bridge Core 52. Intel FPGA HPS EMAC to Multi-rate PHY GMII Adapter Core 53. Intel FPGA MSI to GIC Generator Core

27.3.2. Displaying Characters on the LCD

The driver implements VT100 terminal-like behavior on a miniature scale for the 16×2 screen. Characters written to the LCD controller are stored to an 80-column × 2-row buffer maintained by the driver. As characters are written, the cursor position is updated. Visible characters move the cursor position to the right. Any visible characters written to the right of the buffer are discarded. The line feed character (\n) moves the cursor down one line and to the left-most column.

The buffer is scrolled up as soon as a printable character is written onto the line below the bottom of the buffer. Rows do not scroll as soon as the cursor moves down to allow the maximum useful information in the buffer to be displayed.

If the visible characters in the buffer fit on the display, all characters are displayed. If the buffer is wider than the display, the display scrolls horizontally to display all the characters. Different lines scroll at different speeds, depending on the number of characters in each line of the buffer.

The LCD driver supports a small subset of ANSI and VT100 escape sequences that can be used to control the cursor position, and clear the display as shown below.

Table 272.  Escape Sequence Supported by the LCD Controller
Sequence Meaning
BS   (\b) Moves the cursor to the left by one character.
CR   (\r) Moves the cursor to the start of the current line.
LF   (\n) Moves the cursor to the start of the line and move it down one line.
ESC (  (\x1B) Starts a VT100 control sequence.
ESC   [   <y>   ;   <x>   H Moves the cursor to the y, x position specified – positions are counted from the top left which is 1;1.
ESC   [  K Clears from current cursor position to end of line.
ESC   [   2  J Clears the whole screen.

The LCD controller is an output-only device. Therefore, attempts to read from it returns immediately indicating that no characters have been received.

The LCD controller drivers are not included in the system library when the Reduced device drivers option is enabled for the system library. If you want to use the LCD controller while using small drivers for other devices, add the preprocessor option—DALT_USE_LCD_16207 to the preprocessor options.