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General Purpose Input Output GPIO

ECE 699: Lecture 4. General Purpose Input Output GPIO. Required Reading. The ZYNQ Book Tutorials. Tutorial 1: First Designs on ZYNQ. ZYBO Reference Manual. Section 13: Basic I/O. LogiCORE IP AXI GPIO Product Specification. LogiCORE IP AXI GPIO v2.0 Product Guide. The ZYNQ Book.

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General Purpose Input Output GPIO

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  1. ECE 699: Lecture 4 General Purpose Input Output GPIO

  2. Required Reading The ZYNQ Book Tutorials • Tutorial 1: First Designs on ZYNQ ZYBO Reference Manual • Section 13: Basic I/O LogiCORE IP AXI GPIO Product Specification LogiCORE IP AXI GPIO v2.0 Product Guide The ZYNQ Book • Chapter 2: The Zynq Device (“What is it?)

  3. ZYBO Board Source: ZYBO Reference Manual

  4. ZYBO Board Components Source: ZYBO Reference Manual

  5. Source: The Zynq Book Tutorials

  6. ZYBO General Purpose Input Output (GPIO) Source: ZYBO Reference Manual

  7. Mapping of an Embedded SoC Hardware Architecture to Zynq Source: Xilinx White Paper: Extensible Processing Platform

  8. Mapping of an Embedded SoC Hardware Architecture to Zynq Source: The Zynq Book

  9. A Simplified Model of the Zynq Architecture Source: The Zynq Book

  10. Source: The Zynq Book Tutorials

  11. Source: The Zynq Book Tutorials

  12. Source: The Zynq Book Tutorials

  13. ZYBO Board Source: ZYBO Reference Manual

  14. ZYBO Board Components Source: ZYBO Reference Manual

  15. The Zynq Processing System Source: The Zynq Book

  16. Simplified Block Diagram of the Application Processing Unit (APU) Source: The Zynq Book

  17. 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 asinput 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

  18. Block Diagram of AXI GPIO enabled only when the C_INTERRUPT_PRESENT generic set to 1 IPIC – IP Interconnect interface Source: LogiCORE IP AXI GPIO: Product Specification

  19. GPIO Core Source: LogiCORE IP AXI GPIO: Product Specification

  20. GPIO Core Parameters Source: LogiCORE IP AXI GPIO: Product Specification

  21. Setting GPIO Core Parameters in Vivado

  22. Setting GPIO Core Parameters in Vivado

  23. GPIO_DATA and GPIO2_DATA Registers Source: LogiCORE IP AXI GPIO: Product Specification

  24. GPIO_TRI and GPIO2_TRI Registers Source: LogiCORE IP AXI GPIO: Product Specification

  25. AXI GPIO System Parameters C_HIGHADDR – C_BASEADDR ≥ 0xFFF Source: LogiCORE IP AXI GPIO: Product Specification

  26. Addresses of AXI GPIO Registers Source: LogiCORE IP AXI GPIO: Product Specification

  27. Address Editor in Vivado

  28. AXI Interconnects and Interfaces Source: The Zynq Book

  29. xparameters.h /* 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

  30. C Program (1) /* 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 */

  31. C Program (2) 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);

  32. C Program (3) /* 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 */ }

  33. C Program (4) /* 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; }

  34. Source: LogiCORE IP AXI GPIO: Product Specification

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