This is the documentation for the latest (master) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

GR716-MINI Development Board

Overview

The GR716-MINI development board provides:

  • GR716 microcontroller

  • SPI Flash PROM, 32 MiB

  • SRAM, 2 MiB

  • FTDI USB interface for UART debug link (AHBUART) and application UART (APBUART).

  • 4x MMCX connectors (2 ADC, 2 DAC)

  • Miniature 80 pin mezzanine connector (bottom side)

GR716-MINI Development Board

GR716-MINI Development Board (Credit: Cobham Gaisler AB)

Hardware

Console Output

By default, the kernel is configured to send console output to the first APBUART peripheral (apbuart0). The UART debug forwarding setting, if enabled in GRMON, is preserved.

Programming and Debugging

Building

Applications for the gr716a_mini board configuration can be built as usual (see Building an Application). In order to build the application for gr716a_mini, set the BOARD variable to gr716a_mini.

The application is linked to the on-chip tightly coupled memory by default.

Running on hardware

Connect with GRMON, then load and run the application.

$ grmon -u -cginit 0x00010000 -uart /dev/ttyUSB0
  GRMON debug monitor v3.2.8

  Copyright (C) 2020 Cobham Gaisler - All rights reserved.
  For latest updates, go to http://www.gaisler.com/
  Comments or bug-reports to support@gaisler.com

  Device ID:           0x716
  GRLIB build version: 4204
  Detected system:     GR716
  Detected frequency:  20.0 MHz

  Component                            Vendor
  AHB-to-AHB Bridge                    Cobham Gaisler
  MIL-STD-1553B Interface              Cobham Gaisler
  GRSPW2 SpaceWire Serial Link         Cobham Gaisler
  SPI to AHB Bridge                    Cobham Gaisler
  I2C to AHB Bridge                    Cobham Gaisler
  CAN Controller with DMA              Cobham Gaisler
  CAN Controller with DMA              Cobham Gaisler
  AHB Debug UART                       Cobham Gaisler
  AHB-to-AHB Bridge                    Cobham Gaisler
  PacketWire Receiver with DMA         Cobham Gaisler
  PacketWire Transmitter with DMA      Cobham Gaisler
  GRDMAC DMA Controller                Cobham Gaisler
  GRDMAC DMA Controller                Cobham Gaisler
  GRDMAC DMA Controller                Cobham Gaisler
  GRDMAC DMA Controller                Cobham Gaisler
  Dual-port SPI Slave                  Cobham Gaisler
  LEON3FT SPARC V8 Processor           Cobham Gaisler
  AHB-to-AHB Bridge                    Cobham Gaisler
  AHB Memory Scrubber                  Cobham Gaisler
  AHB-to-AHB Bridge                    Cobham Gaisler
  AHB Debug UART                       Cobham Gaisler
  Dual-port AHB(/CPU) On-Chip RAM      Cobham Gaisler
  Dual-port AHB(/CPU) On-Chip RAM      Cobham Gaisler
  Generic AHB ROM                      Cobham Gaisler
  Memory controller with EDAC          Cobham Gaisler
  SPI Memory Controller                Cobham Gaisler
  SPI Memory Controller                Cobham Gaisler
  AHB/APB Bridge                       Cobham Gaisler
  AHB/APB Bridge                       Cobham Gaisler
  AHB/APB Bridge                       Cobham Gaisler
  AHB/APB Bridge                       Cobham Gaisler
  Memory controller with EDAC          Cobham Gaisler
  LEON3 Debug Support Unit             Cobham Gaisler
  AHB/APB Bridge                       Cobham Gaisler
  AMBA Trace Buffer                    Cobham Gaisler
  Multi-processor Interrupt Ctrl.      Cobham Gaisler
  Modular Timer Unit                   Cobham Gaisler
  Modular Timer Unit                   Cobham Gaisler
  GR716 AMBA Protection unit           Cobham Gaisler
  Clock gating unit                    Cobham Gaisler
  Clock gating unit                    Cobham Gaisler
  General Purpose Register             Cobham Gaisler
  LEON3 Statistics Unit                Cobham Gaisler
  AHB Status Register                  Cobham Gaisler
  CCSDS TDP / SpaceWire I/F            Cobham Gaisler
  General Purpose Register Bank        Cobham Gaisler
  General Purpose Register             Cobham Gaisler
  GR716 AMBA Protection unit           Cobham Gaisler
  GR716 Bandgap                        Cobham Gaisler
  GR716 Brownout detector              Cobham Gaisler
  GR716 Phase-locked loop              Cobham Gaisler
  Generic UART                         Cobham Gaisler
  Generic UART                         Cobham Gaisler
  Generic UART                         Cobham Gaisler
  Generic UART                         Cobham Gaisler
  Generic UART                         Cobham Gaisler
  Generic UART                         Cobham Gaisler
  AHB Status Register                  Cobham Gaisler
  ADC / DAC Interface                  Cobham Gaisler
  SPI Controller                       Cobham Gaisler
  SPI Controller                       Cobham Gaisler
  PWM generator                        Cobham Gaisler
  General Purpose I/O port             Cobham Gaisler
  General Purpose I/O port             Cobham Gaisler
  AMBA Wrapper for OC I2C-master       Cobham Gaisler
  AMBA Wrapper for OC I2C-master       Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Analog-to-Digital Conv         Cobham Gaisler
  GR716 Digital-to-Analog Conv         Cobham Gaisler
  GR716 Digital-to-Analog Conv         Cobham Gaisler
  GR716 Digital-to-Analog Conv         Cobham Gaisler
  GR716 Digital-to-Analog Conv         Cobham Gaisler
  I2C Slave                            Cobham Gaisler
  I2C Slave                            Cobham Gaisler
  PWM generator                        Cobham Gaisler
  LEON3 Statistics Unit                Cobham Gaisler
  General Purpose Register             Cobham Gaisler

  Use command 'info sys' to print a detailed report of attached cores

grmon3> load zephyr/zephyr.elf
      31000000 text              16.2kB /  16.2kB   [===============>] 100%
      300040A8 initlevel           40B              [===============>] 100%
      300040D0 rodata             484B              [===============>] 100%
      300042B4 datas               20B              [===============>] 100%
      300042C8 sw_isr_table       256B              [===============>] 100%
      300043C8 devices             36B              [===============>] 100%
  Total size: 16.98kB (1.91Mbit/s)
  Entry point 0x31000000
  Image zephyr/zephyr.elf loaded

grmon3> run
*** Booting Zephyr OS build zephyr-v2.4.0-788-gc82a8736a65e  ***
Hello World! gr716a_mini

Running in simulation

The same application binary can be simulated with the TSIM3 LEON3 simulator.

$ tsim-leon3 -freq 20 -gr716

 TSIM3 LEON3 SPARC simulator, version v3.0.2

 Copyright (C) 2020, Cobham Gaisler - all rights reserved.
 For latest updates, go to https://www.gaisler.com/
 Comments or bug-reports to support@gaisler.com

Number of CPUs: 1
register windows: 31
system frequency: 20.000 MHz
using 64-bit time
Allocated 128 KiB local instruction RAM memory at 0x31000000
Allocated 64 KiB local data RAM memory at 0x30000000
Allocated 4096 KiB SRAM memory, in 1 bank at 0x40000000
Allocated 2048 KiB ROM memory at 0x01000000
Allocated 16384 KiB SPIM ROM memory at 0x02000000
Allocated 16384 KiB SPIM ROM memory at 0x04000000

tsim> load zephyr/zephyr.elf
  section: text, addr: 0x31000000, size 16956 bytes
  section: initlevel, addr: 0x30000000, size 40 bytes
  section: rodata, addr: 0x30000028, size 484 bytes
  section: datas, addr: 0x3000020c, size 20 bytes
  section: sw_isr_table, addr: 0x30000220, size 256 bytes
  section: devices, addr: 0x30000320, size 36 bytes
  Read 438 symbols
tsim> run
  Initializing and starting from 0x31000000
*** Booting Zephyr OS build zephyr-v2.4.0-788-gc82a8736a65e  ***
Hello World! gr716a_mini