Altera Embedded Peripherals IP - Manual (Page 166)

Macros to access all of the registers are defined in altera_avalon_fifo_regs.h. For example, this file
includes the following macros to access the
status
register.
#define ALTERA_AVALON_FIFO_LEVEL_REG 0
#define ALTERA_AVALON_FIFO_STATUS_REG 1
#define ALTERA_AVALON_FIFO_EVENT_REG 2
#define ALTERA_AVALON_FIFO_IENABLE_REG 3
#define ALTERA_AVALON_FIFO_ALMOSTFULL_REG 4
#define ALTERA_AVALON_FIFO_ALMOSTEMPTY_REG 5
For a complete list of predefined macros and utilities to access the on-chip FIFO hardware, see:
dir>\quartus\sopc_builder\components\altera_avalon_fifo\HAL\inc\
alatera_avalon_fifo.h
and \quartus\sopc_builder\components\altera_avalon_fifo\HAL\inc\
alatera_avalon_fifo_util.h.
Software Example
/***********************************************************************/
//Includes
#include "altera_avalon_fifo_regs.h"
#include "altera_avalon_fifo_util.h"
#include "system.h"
#include "sys/alt_irq.h"
#include
#include
#define ALMOST_EMPTY 2
#define ALMOST_FULL OUTPUT_FIFO_OUT_FIFO_DEPTH-5
volatile int input_fifo_wrclk_irq_event;
void print_status(alt_u32 control_base_address)
{
printf("--------------------------------------\n");
printf("LEVEL = %u\n", altera_avalon_fifo_read_level(control_base_address) );
printf("STATUS = %u\n", altera_avalon_fifo_read_status(control_base_address,
ALTERA_AVALON_FIFO_STATUS_ALL) );
printf("EVENT = %u\n", altera_avalon_fifo_read_event(control_base_address,
ALTERA_AVALON_FIFO_EVENT_ALL) );
printf("IENABLE = %u\n", altera_avalon_fifo_read_ienable(control_base_address,
ALTERA_AVALON_FIFO_IENABLE_ALL) );
printf("ALMOSTEMPTY = %u\n",
altera_avalon_fifo_read_almostempty(control_base_address) );
printf("ALMOSTFULL = %u\n\n",
altera_avalon_fifo_read_almostfull(control_base_address));
}
static void handle_input_fifo_wrclk_interrupts(void* context, alt_u32 id)
{
/* Cast context to input_fifo_wrclk_irq_event's type. It is important
* to declare this volatile to avoid unwanted compiler optimization.
*/
volatile int* input_fifo_wrclk_irq_event_ptr = (volatile int*) context;
/* Store the value in the FIFO's irq history register in *context. */
*input_fifo_wrclk_irq_event_ptr =
altera_avalon_fifo_read_event(INPUT_FIFO_IN_CSR_BASE, ALTERA_AVALON_FIFO_EVENT_ALL);
printf("Interrupt Occurs for %#x\n", INPUT_FIFO_IN_CSR_BASE);
print_status(INPUT_FIFO_IN_CSR_BASE);
/* Reset the FIFO's IRQ History register. */
altera_avalon_fifo_clear_event(INPUT_FIFO_IN_CSR_BASE,
ALTERA_AVALON_FIFO_EVENT_ALL);
}
/* Initialize the fifo */
static int init_input_fifo_wrclk_control()
{
int return_code = ALTERA_AVALON_FIFO_OK;
/* Recast the IRQ History pointer to match the alt_irq_register() function
* prototype. */
UG-01085
2014.24.07
Software Example 16-11
On-Chip FIFO Memory Core Altera Corporation
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