Embedded Peripherals IP User Guide

ID 683130
Date 10/18/2021
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) Core 26. On-Chip Memory II (RAM or ROM) 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

14.4.2. Hardware Access Routines

This section describes the low-level software constructs for manipulating the mutex core. The file altera_avalon_mutex.h declares a structure alt_mutex_dev that represents an instance of a mutex device. It also declares routines for accessing the mutex hardware structure, listed in the table below.
Table 119.  Hardware Access Routines
Function Name Description
altera_avalon_mutex_open() Claims a handle to a mutex, enabling all the other functions to access the mutex core.
altera_avalon_mutex_trylock() Tries to lock the mutex. Returns immediately if it fails to lock the mutex.
altera_avalon_mutex_lock() Locks the mutex. Will not return until it has successfully claimed the mutex.
altera_avalon_mutex_unlock() Unlocks the mutex.
altera_avalon_mutex_is_mine() Determines if this CPU owns the mutex.
altera_avalon_mutex_first_lock() Tests whether the mutex has been released since reset.

These routines coordinate access to the software mutex structure using a hardware mutex core. For a complete description of each function, see section the Mutex API section.

The code shown in below demonstrates opening a mutex device handle and locking a mutex.

#include <altera_avalon_mutex.h>

/* get the mutex device handle */
alt_mutex_dev* mutex = altera_avalon_mutex_open( “/dev/mutex” );

/* acquire the mutex, setting the value to one */
altera_avalon_mutex_lock( mutex, 1 );

/*
 * Access a shared resource here.
 */

/* release the lock */

altera_avalon_mutex_unlock( mutex );