General Purpose Input Output GPIO ECE 699: Lecture 3.

General Purpose Input OutputGPIO

ECE 699: Lecture 3

Required Reading

• Chapter 2: The Zynq Device (“What is it?)

The ZYNQ Book

• Tutorial 1: First Designs on ZYNQ• Tutorial 2: Next Steps in Zynq SoC Design

The ZYNQ Book Tutorials

• Section 13: Basic I/O

ZYBO Reference Manual

LogiCORE IP AXI GPIO Product Specification

LogiCORE IP AXI GPIO v2.0 Product Guide

ZYBO Board

Source: ZYBO Reference Manual

ZYBO Board Components


Source: The Zynq Book Tutorials

ZYBO General Purpose Input Output (GPIO)


Mapping of an Embedded SoC Hardware Architecture to Zynq

Source: Xilinx White Paper: Extensible Processing Platform

Mapping of an Embedded SoC Hardware Architecture to Zynq

Source: The Zynq Book

A Simplified Model of the Zynq Architecture





ZYBO Board


ZYBO Board Components


The Zynq Processing System


Simplified Block Diagram ofthe Application Processing Unit (APU)


AXI GPIO Features

• Configurable single or dual GPIO channel(s)

• Each channel configurable to have from 1 to 32 bits

• Dynamic programming of each GPIO bit as

input or output

• Individual configuration of each channel

• Independent reset values for each bit of all registers

• Optional interrupt request generation

• AXI4-Lite interface to Processing System

Block Diagram of AXI GPIO

IPIC – IP Interconnect interface

enabled only when the C_INTERRUPT_PRESENTgeneric set to 1

Source: LogiCORE IP AXI GPIO: Product Specification

GPIO Core



GPIO Core Parameters

Setting GPIO Core Parameters in Vivado

Setting GPIO Core Parameters in Vivado

GPIO_DATA and GPIO2_DATA Registers


GPIO_TRI and GPIO2_TRI Registers


C_HIGHADDR – C_BASEADDR ≥ 0xFFF

AXI GPIO System Parameters



Addresses of AXI GPIO Registers

Address Editor in Vivado

AXI Interconnects and Interfaces


/* Include Files */

#include "xparameters.h"#include "xgpio.h"#include "xstatus.h"#include "xil_printf.h"

/* Definitions */#define GPIO_DEVICE_ID XPAR_AXI_GPIO_0_DEVICE_ID/* GPIO device that LEDs are connected to */#define LED 0x03 /* Initial LED value */#define LED_DELAY 10000000 /* Software delay length */#define LED_CHANNEL 1 /* GPIO port for LEDs */#define printf xil_printf /* smaller, optimized printf */

C Program (1)

XGpio Gpio; /* GPIO Device driver instance */

int LEDOutputExample(void){

volatile int Delay; int Status; int led = LED; /* Hold current LED value. Initialize to LED definition */

/* GPIO driver initialization */ Status = XGpio_Initialize(&Gpio, GPIO_DEVICE_ID); if (Status != XST_SUCCESS) {

return XST_FAILURE; }

/*Set the direction for the LEDs to output. */ XGpio_SetDataDirection(&Gpio, LED_CHANNEL, 0x00);

C Program (2)

/* Loop forever blinking the LED. */ while (1) { /* Write output to the LEDs. */ XGpio_DiscreteWrite(&Gpio, LED_CHANNEL, led);

/* Flip LEDs. */ led = ~led;

/* Wait a small amount of time so that the LED blinking is visible. */ for (Delay = 0; Delay < LED_DELAY; Delay++); }

return XST_SUCCESS; /* Ideally unreachable */}

C Program (3)

/* Main function. */int main(void){

int Status;

/* Execute the LED output. */Status = LEDOutputExample();if (Status != XST_SUCCESS) {

xil_printf("GPIO output to the LEDs failed!\r\n");}

return 0;}

C Program (4)

/* Definitions for driver GPIO */

#define XPAR_XGPIO_NUM_INSTANCES 1

/* Definitions for peripheral AXI_GPIO_0 */

#define XPAR_AXI_GPIO_0_BASEADDR 0x41200000

#define XPAR_AXI_GPIO_0_HIGHADDR 0x4120FFFF

#define XPAR_AXI_GPIO_0_DEVICE_ID 0

#define XPAR_AXI_GPIO_0_INTERRUPT_PRESENT 0

#define XPAR_AXI_GPIO_0_IS_DUAL 0

xparameters.h


Constraints File



entity design_1_wrapper is port ( DDR_addr : inout STD_LOGIC_VECTOR ( 14 downto 0 ); DDR_ba : inout STD_LOGIC_VECTOR ( 2 downto 0 ); DDR_cas_n : inout STD_LOGIC; DDR_ck_n : inout STD_LOGIC; DDR_ck_p : inout STD_LOGIC; DDR_cke : inout STD_LOGIC; DDR_cs_n : inout STD_LOGIC; DDR_dm : inout STD_LOGIC_VECTOR ( 3 downto 0 ); DDR_dq : inout STD_LOGIC_VECTOR ( 31 downto 0 ); DDR_dqs_n : inout STD_LOGIC_VECTOR ( 3 downto 0 ); DDR_dqs_p : inout STD_LOGIC_VECTOR ( 3 downto 0 ); DDR_odt : inout STD_LOGIC; DDR_ras_n : inout STD_LOGIC; DDR_reset_n : inout STD_LOGIC; DDR_we_n : inout STD_LOGIC; FIXED_IO_ddr_vrn : inout STD_LOGIC; FIXED_IO_ddr_vrp : inout STD_LOGIC; FIXED_IO_mio : inout STD_LOGIC_VECTOR ( 53 downto 0 ); FIXED_IO_ps_clk : inout STD_LOGIC; FIXED_IO_ps_porb : inout STD_LOGIC; FIXED_IO_ps_srstb : inout STD_LOGIC; leds_tri_o : out STD_LOGIC_VECTOR ( 3 downto 0 ) );end design_1_wrapper;

design_1_i: component design_1 port map ( DDR_addr(14 downto 0) => DDR_addr(14 downto 0), DDR_ba(2 downto 0) => DDR_ba(2 downto 0), DDR_cas_n => DDR_cas_n, DDR_ck_n => DDR_ck_n, DDR_ck_p => DDR_ck_p, DDR_cke => DDR_cke, DDR_cs_n => DDR_cs_n, DDR_dm(3 downto 0) => DDR_dm(3 downto 0), DDR_dq(31 downto 0) => DDR_dq(31 downto 0), DDR_dqs_n(3 downto 0) => DDR_dqs_n(3 downto 0), DDR_dqs_p(3 downto 0) => DDR_dqs_p(3 downto 0), DDR_odt => DDR_odt, DDR_ras_n => DDR_ras_n, DDR_reset_n => DDR_reset_n, DDR_we_n => DDR_we_n, FIXED_IO_ddr_vrn => FIXED_IO_ddr_vrn, FIXED_IO_ddr_vrp => FIXED_IO_ddr_vrp, FIXED_IO_mio(53 downto 0) => FIXED_IO_mio(53 downto 0), FIXED_IO_ps_clk => FIXED_IO_ps_clk, FIXED_IO_ps_porb => FIXED_IO_ps_porb, FIXED_IO_ps_srstb => FIXED_IO_ps_srstb, leds_tri_o(3 downto 0) => leds_tri_o(3 downto 0) );

##LEDs##IO_L23P_T3_35set_property PACKAGE_PIN M14 [get_ports {leds_tri_o[0]}]set_property IOSTANDARD LVCMOS33 [get_ports {leds_tri_o[0]}]

##IO_L23N_T3_35set_property PACKAGE_PIN M15 [get_ports {leds_tri_o[1]}]set_property IOSTANDARD LVCMOS33 [get_ports {leds_tri_o[1]}]

##IO_0_35set_property PACKAGE_PIN G14 [get_ports {leds_tri_o[2]}]set_property IOSTANDARD LVCMOS33 [get_ports {leds_tri_o[2]}]

##IO_L3N_T0_DQS_AD1N_35set_property PACKAGE_PIN D18 [get_ports {leds_tri_o[3]}]set_property IOSTANDARD LVCMOS33 [get_ports {leds_tri_o[3]}]

ZYBO_Master.xdc (1)



##Switches##IO_L19N_T3_VREF_35#set_property PACKAGE_PIN G15 [get_ports {sw[0]}]#set_property IOSTANDARD LVCMOS33 [get_ports {sw[0]}]

##IO_L24P_T3_34#set_property PACKAGE_PIN P15 [get_ports {sw[1]}]#set_property IOSTANDARD LVCMOS33 [get_ports {sw[1]}]

##IO_L4N_T0_34#set_property PACKAGE_PIN W13 [get_ports {sw[2]}]#set_property IOSTANDARD LVCMOS33 [get_ports {sw[2]}]

##IO_L9P_T1_DQS_34#set_property PACKAGE_PIN T16 [get_ports {sw[3]}]#set_property IOSTANDARD LVCMOS33 [get_ports {sw[3]}]

ZYBO_Master.xdc (2)

##Buttons##IO_L20N_T3_34#set_property PACKAGE_PIN R18 [get_ports {btn[0]}]#set_property IOSTANDARD LVCMOS33 [get_ports {btn[0]}]

##IO_L24N_T3_34#set_property PACKAGE_PIN P16 [get_ports {btn[1]}]#set_property IOSTANDARD LVCMOS33 [get_ports {btn[1]}]

##IO_L18P_T2_34#set_property PACKAGE_PIN V16 [get_ports {btn[2]}]#set_property IOSTANDARD LVCMOS33 [get_ports {btn[2]}]

##IO_L7P_T1_34#set_property PACKAGE_PIN Y16 [get_ports {btn[3]}]#set_property IOSTANDARD LVCMOS33 [get_ports {btn[3]}]

ZYBO_Master.xdc (3)

Date post:	19-Dec-2015
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General Purpose Input Output GPIO ECE 699: Lecture 3.

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