Application

Overview

In Nuclei SDK, we just provided applications which can run in different boards without any changes in code to demostrate the baremetal service, freertos service and ucosii service features.

The provided applications can be divided into three categories:

Bare-metal applications: Located in application/baremetal
FreeRTOS applications: Located in application/freertos
UCOSII applications: Located in application/ucosii
RTThread applications: Located in application/rtthread

If you want to develop your own application in Nuclei SDK, please click Application Development to learn more about it.

The following applications are running using RV-STAR board.

Bare-metal applications

helloworld

This helloworld application is used to print hello world, and also will check this RISC-V CSR MISA register value.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the helloworld directory
cd application/baremetal/helloworld
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Feb 21 2020, 12:24:22
Download Mode: FLASHXIP
CPU Frequency 109323529 Hz
MISA: 0x40901105
MISA: RV32IMACUX
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!
Hello World From Nuclei RISC-V Processor!

demo_timer

This demo_timer application is used to demostrate how to use the CORE TIMER API including the Timer Interrupt and Timer Software Interrupt.

Both interrupts are registered as non-vector interrupt.
First the timer interrupt will run for 10 times
Then the software timer interrupt will start to run for 10 times

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the demo_timer directory
cd application/baremetal/demo_timer
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Feb 21 2020, 12:52:37
Download Mode: FLASHXIP
CPU Frequency 108794117 Hz
init timer and start
MTimer IRQ handler 1
MTimer IRQ handler 2
MTimer IRQ handler 3
MTimer IRQ handler 4
MTimer IRQ handler 5
MTimer IRQ handler 6
MTimer IRQ handler 7
MTimer IRQ handler 8
MTimer IRQ handler 9
MTimer IRQ handler 10
MTimer SW IRQ handler 1
MTimer SW IRQ handler 2
MTimer SW IRQ handler 3
MTimer SW IRQ handler 4
MTimer SW IRQ handler 5
MTimer SW IRQ handler 6
MTimer SW IRQ handler 7
MTimer SW IRQ handler 8
MTimer SW IRQ handler 9
MTimer SW IRQ handler 10
MTimer msip and mtip interrupt test finish and pass

demo_eclic

This demo_eclic application is used to demostrate how to use the ECLIC API and Interrupt.

Note

In this application’s Makefile, we provided comments in Makefile about optimize for code size.

If you want to optimize this application for code size, you can set the COMMON_FLAGS variable to the following values, we recommend to use -Os -flto.

Code size optimization for demo_eclic on RV-STAR target
COMMON_FLAGS	text(bytes)	data(bytes)	bss(bytes)	total(bytes)
	13724	112	2266	16102
-flto	13598	112	2266	15976
-Os	9690	112	2264	12066
-Os -flto	9132	112	2264	11508
-Os -msave-restore -fno-unroll-loops	9714	112	2264	12090
-Os -msave-restore -fno-unroll-loops -flto	9204	112	2264	11580

The timer interrupt and timer software interrupt are used
The timer interrupt is registered as non-vector interrupt
The timer software interrupt is registered as vector interrupt, and we enable its preemptive feature by using SAVE_IRQ_CSR_CONTEXT and RESTORE_IRQ_CSR_CONTEXT in timer software interrupt handler
The timer interrupt is triggered periodly
The timer software interrupt is triggered in timer interrupt handler using SysTimer_SetSWIRQ function.
In the application code, there is a macro called SWIRQ_INTLEVEL_HIGHER to control the timer software interrupt working feature:
- If SWIRQ_INTLEVEL_HIGHER=1, the timer software interrupt level is higher then timer interrupt level, so when timer software interrupt is triggerred, then timer software interrupt will be processed immediately, and timer interrupt will be preempted by timer software interrupt.
- If SWIRQ_INTLEVEL_HIGHER=0, the timer software interrupt level is lower then timer interrupt level, so when timer software interrupt is triggerred, then timer software interrupt will be processed after timer interrupt, and timer interrupt will not be preempted by timer software interrupt.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the demo_eclic directory
cd application/baremetal/demo_eclic
# Change macro SWIRQ_INTLEVEL_HIGHER value in demo_eclic.c
# to see different working mode of this demo
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output(SWIRQ_INTLEVEL_HIGHER=1) as below:

Nuclei SDK Build Time: Feb 21 2020, 16:35:58
Download Mode: FLASHXIP
CPU Frequency 108794117 Hz
Initialize timer and start timer interrupt periodly
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 0 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run during timer interrupt
[IN SOFTWARE INTERRUPT]software interrupt hit 0 times
[IN SOFTWARE INTERRUPT]software interrupt end
[IN TIMER INTERRUPT]timer interrupt end
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 1 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run during timer interrupt
[IN SOFTWARE INTERRUPT]software interrupt hit 1 times
[IN SOFTWARE INTERRUPT]software interrupt end
[IN TIMER INTERRUPT]timer interrupt end
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 2 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run during timer interrupt
[IN SOFTWARE INTERRUPT]software interrupt hit 2 times
[IN SOFTWARE INTERRUPT]software interrupt end
[IN TIMER INTERRUPT]timer interrupt end
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 3 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run during timer interrupt
[IN SOFTWARE INTERRUPT]software interrupt hit 3 times
[IN SOFTWARE INTERRUPT]software interrupt end
[IN TIMER INTERRUPT]timer interrupt end

Expected output(SWIRQ_INTLEVEL_HIGHER=0) as below:

Nuclei SDK Build Time: Feb 21 2020, 16:35:58
Download Mode: FLASHXIP
CPU Frequency 108794117 Hz
Initialize timer and start timer interrupt periodly
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 0 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run when timer interrupt finished
[IN TIMER INTERRUPT]timer interrupt end
[IN SOFTWARE INTERRUPT]software interrupt hit 0 times
[IN SOFTWARE INTERRUPT]software interrupt end
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 1 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run when timer interrupt finished
[IN TIMER INTERRUPT]timer interrupt end
[IN SOFTWARE INTERRUPT]software interrupt hit 1 times
[IN SOFTWARE INTERRUPT]software interrupt end
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 2 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run when timer interrupt finished
[IN TIMER INTERRUPT]timer interrupt end
[IN SOFTWARE INTERRUPT]software interrupt hit 2 times
[IN SOFTWARE INTERRUPT]software interrupt end
-------------------
[IN TIMER INTERRUPT]timer interrupt hit 3 times
[IN TIMER INTERRUPT]trigger software interrupt
[IN TIMER INTERRUPT]software interrupt will run when timer interrupt finished
[IN TIMER INTERRUPT]timer interrupt end
[IN SOFTWARE INTERRUPT]software interrupt hit 3 times
[IN SOFTWARE INTERRUPT]software interrupt end

demo_dsp

This demo_dsp application is used to demostrate how to NMSIS-DSP API.

Mainly show how we can use DSP library and header files.
It mainly demo the riscv_conv_xx functions and its reference functions
If your Nuclei Processor Core has DSP feature enabled, you can pass extra DSP_ENABLE=ON in your make command to use NMSIS-DSP library with DSP enabled.
By default, the application will use NMSIS-DSP library with DSP enabled.

Note

From version 0.2.4, this demo is upgraded to a more complex version which shows the usage of riscv_conv_xx functions, and DSP_ENABLE is changed from OFF to ON by default.
The GD32VF103 SoC didn’t has DSP enabled, so this SoC can only use NMSIS-DSP library with DSP disabled, so please pass extra DSP_ENABLE=OFF when run make.
For other Nuclei Processor Core based SoC, please check whether it has DSP feature enabled to decide which kind of NMSIS-DSP library to use.
Even our NMSIS-DSP library with DSP disabled are also optimized, so it can also provide good performance in some functions.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the demo_dsp directory
cd application/baremetal/demo_dsp
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Jun 18 2020, 17:43:31
Download Mode: FLASHXIP
CPU Frequency 108270000 Hz
CSV, riscv_conv_q31, 1225418
CSV, ref_conv_q31, 2666240
SUCCESS, riscv_conv_q31
CSV, riscv_conv_q15, 289940
CSV, ref_conv_q15, 311158
SUCCESS, riscv_conv_q15
CSV, riscv_conv_q7, 463
CSV, ref_conv_q7, 846
SUCCESS, riscv_conv_q7
CSV, riscv_conv_fast_q15, 106293
CSV, ref_conv_fast_q15, 247938
SUCCESS, riscv_conv_fast_q15
CSV, riscv_conv_fast_q31, 490539
CSV, ref_conv_fast_q31, 2215917
SUCCESS, riscv_conv_fast_q31
CSV, riscv_conv_opt_q15, 217250
CSV, ref_conv_opt_q15, 311162
SUCCESS, riscv_conv_opt_q15
CSV, riscv_conv_opt_q7, 714
CSV, ref_conv_opt_q7, 842
SUCCESS, riscv_conv_opt_q7
CSV, riscv_conv_fast_opt_q15, 137252
CSV, ref_conv_fast_opt_q15, 249958
SUCCESS, riscv_conv_fast_opt_q15
all test are passed. Well done!

lowpower

This lowpower application is used to demostrate how to use lowpower feature of RISC-V processor.

Timer interrupt is setup before enter to wfi mode, and global interrupt will be disabled, so interrupt handler will not be entered, and will directly resume to next pc of wfi.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# Assume your processor has enabled lowpower feature
# cd to the lowpower directory
cd application/baremetal/lowpower
# Clean the application first
make SOC=demosoc BOARD=nuclei_fpga_eval DOWNLOAD=ilm CORE=n300 clean
# Build and upload the application
make SOC=demosoc BOARD=nuclei_fpga_eval DOWNLOAD=ilm CORE=n300 upload

Expected output as below:

Nuclei SDK Build Time: Jun  9 2022, 11:23:14
Download Mode: ILM
CPU Frequency 15996354 Hz
CSV, WFI Start/End, 178264/178289
CSV, WFI Cost, 25

smphello

This smphello application is used to demostrate how to use baremetal SMP feature.

This demo request the SMP cores share the same RAM and ROM, for example, in current demosoc system, ilm/dlm are private resource for cpu, only the DDR memory are shared resource for all the cpu.

And RVA atomic extension is required to run this application, this extension is used to do spinlock in this example.

Note

If didn’t work with gd32vf103 processor.
Need to enable I/D Cache in <Device.h> if I/D Cache present in CPU.

Need to change __ICACHE_PRESENT, __DCACHE_PRESENT and __CCM_PRESENT to 1 in SoC/demosoc/Common/Include/demosoc.h before run this application.

diff --git a/SoC/demosoc/Common/Include/demosoc.h b/SoC/demosoc/Common/Include/demosoc.h
index 256cc614..fc9934ae 100644
--- a/SoC/demosoc/Common/Include/demosoc.h
+++ b/SoC/demosoc/Common/Include/demosoc.h
@@ -243,9 +243,9 @@ extern volatile IRegion_Info_Type SystemIRegionInfo;
 #define __PMP_ENTRY_NUM           16                    /*!< Set to 8 or 16, the number of PMP entries */

 #ifndef RUNMODE_CONTROL
 -#define __ICACHE_PRESENT          0                     /*!< Set to 1 if I-Cache is present */
 -#define __DCACHE_PRESENT          0                     /*!< Set to 1 if D-Cache is present */
 -#define __CCM_PRESENT             0                     /*!< Set to 1 if Cache Control and Mantainence Unit is present */
 +#define __ICACHE_PRESENT          1                     /*!< Set to 1 if I-Cache is present */
 +#define __DCACHE_PRESENT          1                     /*!< Set to 1 if D-Cache is present */
 +#define __CCM_PRESENT             1                     /*!< Set to 1 if Cache Control and Mantainence Unit is present */
 #else // RUNMODE_CONTROL is defined in SoC/demosoc/runmode.mk, for internal usage not intend for widely usage
 #define __ICACHE_PRESENT          RUNMODE_IC_EN         /*!< Set to 1 if I-Cache is present */
 #define __DCACHE_PRESENT          RUNMODE_DC_EN         /*!< Set to 1 if D-Cache is present */

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# Use Nuclei UX600 SMP 2 Core RISC-V processor as example
# application need to run in ddr memory not in ilm memory
# cd to the smphello directory
cd application/baremetal/smphello
# Clean the application first
make SOC=demosoc BOARD=nuclei_fpga_eval SMP=2 DOWNLOAD=ddr CORE=ux600 clean
# Build and upload the application
make SOC=demosoc BOARD=nuclei_fpga_eval SMP=2 DOWNLOAD=ddr CORE=ux600 upload

Expected output as below:

Nuclei SDK Build Time: May 30 2022, 15:38:00
Download Mode: DDR
CPU Frequency 15998648 Hz
Hello world from hart 0
Hello world from hart 1
All harts boot successfully!

demo_nice

This demo_nice application is used to demostrate how to Nuclei NICE feature.

NICE is short for Nuclei Instruction Co-unit Extension, which is used to support extensive customization and specialization.

NICE allows customers to create user-defined instructions, enabling the integrations of custom hardware co-units that improve domain-specific performance while reducing power consumption.

For more about NICE feature, please click Nuclei User Extended Introduction.

Mainly show how to use NICE intrinsic function with compiler.
It only works with Nuclei RISC-V Processor with the hardware NICE demo intergated.

Note

If didn’t work with gd32vf103 processor.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# Use Nuclei UX607 RISC-V processor as example, hardware NICE demo intergated
# cd to the demo_dsp directory
cd application/baremetal/demo_nice
# Clean the application first
make SOC=demosoc BOARD=nuclei_fpga_eval CORE=ux600 clean
# Build and upload the application
make SOC=demosoc BOARD=nuclei_fpga_eval CORE=ux600 upload

Expected output as below:

Nuclei SDK Build Time: Nov 26 2020, 11:14:51
Download Mode: ILM
CPU Frequency 15999631 Hz

Nuclei Nice Acceleration Demonstration
1. Print input matrix array
the element of array is :
        10      30      90
        20      40      80
        30      90      120

1. Do reference matrix column sum and row sum
2. Do nice matrix column sum and row sum
3. Compare reference and nice result
  1) Reference result:
the sum of each row is :
                130     140     240
the sum of each col is :
                60      160     290
  1) Nice result:
the sum of each row is :
                130     140     240
the sum of each col is :
                60      160     290
  1) Compare reference vs nice: PASS
1. Performance summary
         normal:
              instret: 511, cycle: 790
         nice  :
              instret: 125, cycle: 227

coremark

This coremark benchmark application is used to run EEMBC CoreMark Software.

EEMBC CoreMark Software is a product of EEMBC and is provided under the terms of the CoreMark License that is distributed with the official EEMBC COREMARK Software release. If you received this EEMBC CoreMark Software without the accompanying CoreMark License, you must discontinue use and download the official release from www.coremark.org.

In Nuclei SDK, we provided code and Makefile for this coremark application. You can also optimize the COMMON_FLAGS defined in coremark application Makefile to get different score number.

By default, this application runs for 600 iterations, you can also change this in Makefile. e.g. Change this -DITERATIONS=600 to value such as -DITERATIONS=5000
macro PERFORMANCE_RUN=1 is defined
PFLOAT = 1 is added in its Makefile to enable float value print
For different Nuclei CPU series, the benchmark options are different, currently you can pass CPU_SERIES=900 to select benchmark options for 900 series, otherwise the benchmark options for 200/300/600/900 will be selected which is also the default value.

Note

Since for each SoC platforms, the CPU frequency is different, so user need to change the ITERATIONS defined in Makefile to proper value to let the coremark run at least 10 seconds
For example, for the gd32vf103 based boards supported in Nuclei SDK, we suggest to change -DITERATIONS=600 to -DITERATIONS=5000

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the coremark directory
cd application/baremetal/benchmark/coremark
# change ITERATIONS value in Makefile for gd32vf103 based board to 5000
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Mar 30 2020, 18:08:53
Download Mode: FLASHXIP
CPU Frequency 107190000 Hz
Start to run coremark for 5000 iterations
2K performance run parameters for coremark.
CoreMark Size    : 666
Total ticks      : 1622809457
Total time (secs): 15.139593
Iterations/Sec   : 330.259868
Iterations       : 5000
Compiler version : GCC9.2.0
Compiler flags   : -O2 -flto -funroll-all-loops -finline-limit=600 -ftree-dominator-opts -fno-if-conversion2 -fselective-scheduling -fno-code-hoisting -fno-common -funroll-loops -finline-functions -falign-functions=4 -falign-jumps=4 -falign-loops=4
Memory location  : STACK
seedcrc          : 0xe9f5
[0]crclist       : 0xe714
[0]crcmatrix     : 0x1fd7
[0]crcstate      : 0x8e3a
[0]crcfinal      : 0xbd59
Correct operation validated. See readme.txt for run and reporting rules.
CoreMark 1.0 : 330.259868 / GCC9.2.0 -O2 -flto -funroll-all-loops -finline-limit=600 -ftree-dominator-opts -fno-if-conversion2 -fselective-scheduling -fno-code-hoisting -fno-common -funroll-loops -finline-functions -falign-functions=4 -falign-jumps=4 -falign-loops=4 / STACK


Print Personal Added Addtional Info to Easy Visual Analysis

    (Iterations is: 5000
    (total_ticks is: 1622809457
(*) Assume the core running at 1 MHz
    So the CoreMark/MHz can be caculated by:
    (Iterations*1000000/total_ticks) = 3.081076 CoreMark/MHz

dhrystone

This dhrystone benchmark application is used to run DHRYSTONE Benchmark Software.

The Dhrystone benchmark program has become a popular benchmark for CPU/compiler performance measurement, in particular in the area of minicomputers, workstations, PC’s and microprocesors.

It apparently satisfies a need for an easy-to-use integer benchmark;
it gives a first performance indication which is more meaningful than MIPS numbers which, in their literal meaning (million instructions per second), cannot be used across different instruction sets (e.g. RISC vs. CISC).
With the increasing use of the benchmark, it seems necessary to reconsider the benchmark and to check whether it can still fulfill this function.

In Nuclei SDK, we provided code and Makefile for this dhrystone application. You can also optimize the COMMON_FLAGS defined in dhrystone application Makefile to get different score number.

PFLOAT = 1 is added in its Makefile to enable float value print
You can change Number_Of_Runs in dhry_1.c line 134 to increate or decrease number of iterations

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the dhrystone directory
cd application/baremetal/benchmark/dhrystone
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Feb 21 2020, 14:23:55
Download Mode: FLASHXIP
CPU Frequency 108801980 Hz

Dhrystone Benchmark, Version 2.1 (Language: C)

Program compiled without 'register' attribute

Please give the number of runs through the benchmark:
Execution starts, 500000 runs through Dhrystone
Execution ends

Final values of the variables used in the benchmark:

Int_Glob:            5
        should be:   5
Bool_Glob:           1
        should be:   1
Ch_1_Glob:           A
        should be:   A
Ch_2_Glob:           B
        should be:   B
Arr_1_Glob[8]:       7
        should be:   7
Arr_2_Glob[8][7]:    500010
        should be:   Number_Of_Runs + 10
Ptr_Glob->
  Ptr_Comp:          536883352
        should be:   (implementation-dependent)
  Discr:             0
        should be:   0
  Enum_Comp:         2
        should be:   2
  Int_Comp:          17
        should be:   17
  Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
        should be:   DHRYSTONE PROGRAM, SOME STRING
Next_Ptr_Glob->
  Ptr_Comp:          536883352
        should be:   (implementation-dependent), same as above
  Discr:             0
        should be:   0
  Enum_Comp:         1
        should be:   1
  Int_Comp:          18
        should be:   18
  Str_Comp:          DHRYSTONE PROGRAM, SOME STRING
        should be:   DHRYSTONE PROGRAM, SOME STRING
Int_1_Loc:           5
        should be:   5
Int_2_Loc:           13
        should be:   13
Int_3_Loc:           7
        should be:   7
Enum_Loc:            1
        should be:   1
Str_1_Loc:           DHRYSTONE PROGRAM, 1'ST STRING
        should be:   DHRYSTONE PROGRAM, 1'ST STRING
Str_2_Loc:           DHRYSTONE PROGRAM, 2'ND STRING
        should be:   DHRYSTONE PROGRAM, 2'ND STRING

 (*) User_Cycle for total run through Dhrystone with loops 500000:
223500116
       So the DMIPS/MHz can be caculated by:
       1000000/(User_Cycle/Number_Of_Runs)/1757 = 1.273270 DMIPS/MHz

whetstone

This whetstone benchmark application is used to run C/C++ Whetstone Benchmark Software (Single or Double Precision).

The Fortran Whetstone programs were the first general purpose benchmarks that set industry standards of computer system performance. Whetstone programs also addressed the question of the efficiency of different programming languages, an important issue not covered by more contemporary standard benchmarks.

In Nuclei SDK, we provided code and Makefile for this whetstone application. You can also optimize the COMMON_FLAGS defined in whetstone application Makefile to get different score number.

PFLOAT = 1 is added in its Makefile to enable float value print
Extra LDFLAGS := -lm is added in its Makefile to include the math library

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the whetstone directory
cd application/baremetal/benchmark/whetstone
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Feb 21 2020, 14:50:15
Download Mode: FLASHXIP
CPU Frequency 109069306 Hz

##########################################
Single Precision C Whetstone Benchmark Opt 3 32 Bit
Calibrate
       1.96 Seconds          1   Passes (x 100)
       9.81 Seconds          5   Passes (x 100)

Use 5  passes (x 100)

          Single Precision C/C++ Whetstone Benchmark

Loop content                  Result              MFLOPS      MOPS   Seconds

N1 floating point -1.12475013732910156         1.053              0.091
N2 floating point -1.12274742126464844         1.053              0.638
N3 if then else    1.00000000000000000               108527.617    0.000
N4 fixed point    12.00000000000000000                   5.630    0.280
N5 sin,cos etc.    0.49909299612045288                   0.109    3.829
N6 floating point  0.99999982118606567         1.082              2.493
N7 assignments     3.00000000000000000                 419.794    0.002
N8 exp,sqrt etc.   0.75110614299774170                   0.075    2.492

MWIPS                                              5.089              9.825


MWIPS/MHz                                          0.046              9.825

FreeRTOS applications

demo

This freertos demo application is show basic freertos task functions.

Two freertos tasks are created
A software timer is created

In Nuclei SDK, we provided code and Makefile for this freertos demo application.

RTOS = FreeRTOS is added in its Makefile to include FreeRTOS service
The configTICK_RATE_HZ in FreeRTOSConfig.h is set to 100, you can change it to other number according to your requirement.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the freertos demo directory
cd application/freertos/demo
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Feb 21 2020, 14:56:00
Download Mode: FLASHXIP
CPU Frequency 109058823 Hz
Before StartScheduler
Enter to task_1
task1 is running 0.....
Enter to task_2
task2 is running 0.....
timers Callback 0
timers Callback 1
task1 is running 1.....
task2 is running 1.....
timers Callback 2
timers Callback 3
task1 is running 2.....
task2 is running 2.....
timers Callback 4
timers Callback 5
task1 is running 3.....
task2 is running 3.....
timers Callback 6
timers Callback 7
task1 is running 4.....
task2 is running 4.....
timers Callback 8
timers Callback 9
task1 is running 5.....
task2 is running 5.....
timers Callback 10
timers Callback 11

UCOSII applications

demo

This ucosii demo application is show basic ucosii task functions.

4 tasks are created
1 task is created first, and then create 3 other tasks and then suspend itself

In Nuclei SDK, we provided code and Makefile for this ucosii demo application.

RTOS = UCOSII is added in its Makefile to include UCOSII service
The OS_TICKS_PER_SEC in os_cfg.h is by default set to 50, you can change it to other number according to your requirement.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the ucosii demo directory
cd application/ucosii/demo
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Feb 21 2020, 15:00:35
Download Mode: FLASHXIP
CPU Frequency 108524271 Hz
Start ucosii...
create start task success
start all task...
task3 is running... 1
task2 is running... 1
task1 is running... 1
task3 is running... 2
task2 is running... 2
task3 is running... 3
task2 is running... 3
task1 is running... 2
task3 is running... 4
task2 is running... 4
task3 is running... 5
task2 is running... 5
task1 is running... 3
task3 is running... 6
task2 is running... 6
task3 is running... 7
task2 is running... 7
task1 is running... 4
task3 is running... 8
task2 is running... 8
task3 is running... 9
task2 is running... 9
task1 is running... 5
task3 is running... 10
task2 is running... 10
task3 is running... 11
task2 is running... 11
task1 is running... 6
task3 is running... 12
task2 is running... 12

RT-Thread applications

demo

This rt-thread demo application is show basic rt-thread thread functions.

main function is a pre-created thread by RT-Thread
main thread will create 5 test threads using the same function thread_entry

In Nuclei SDK, we provided code and Makefile for this rtthread demo application.

RTOS = RTThread is added in its Makefile to include RT-Thread service
The RT_TICK_PER_SECOND in rtconfig.h is by default set to 100, you can change it to other number according to your requirement.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the rtthread demo directory
cd application/rtthread/demo
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Apr 14 2020, 10:14:30
Download Mode: FLASHXIP
CPU Frequency 108270000 Hz

\ | /
- RT -     Thread Operating System
/ | \     3.1.3 build Apr 14 2020
2006 - 2019 Copyright by rt-thread team
Main thread count: 0
thread 0 count: 0
thread 1 count: 0
thread 2 count: 0
thread 3 count: 0
thread 4 count: 0
thread 0 count: 1
thread 1 count: 1
thread 2 count: 1
thread 3 count: 1
thread 4 count: 1
Main thread count: 1
thread 0 count: 2
thread 1 count: 2
thread 2 count: 2
thread 3 count: 2
thread 4 count: 2
thread 0 count: 3
thread 1 count: 3
thread 2 count: 3
thread 3 count: 3
thread 4 count: 3
Main thread count: 2
thread 0 count: 4
thread 1 count: 4

msh

This rt-thread msh application demonstrates msh shell in serial console which is a component of rt-thread.

MSH_CMD_EXPORT(nsdk, msh nuclei sdk demo) exports a command nsdk to msh shell

In Nuclei SDK, we provided code and Makefile for this rtthread msh application.

RTOS = RTThread is added in its Makefile to include RT-Thread service
RTTHREAD_MSH := 1 is added in its Makefile to include RT-Thread msh component
The RT_TICK_PER_SECOND in rtconfig.h is by default set to 100, you can change it to other number according to your requirement.
To run this application in Nuclei Demo SoC, the SoC clock frequency must be above 16MHz, if run in 8MHz, uart read is not correct due to bit error in uart rx process.

How to run this application:

# Assume that you can set up the Tools and Nuclei SDK environment
# cd to the rtthread msh directory
cd application/rtthread/msh
# Clean the application first
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar clean
# Build and upload the application
make SOC=gd32vf103 BOARD=gd32vf103v_rvstar upload

Expected output as below:

Nuclei SDK Build Time: Dec 23 2020, 16:39:21
Download Mode: FLASHXIP
CPU Frequency 108810000 Hz

\ | /
- RT -     Thread Operating System
/ | \     3.1.3 build Dec 23 2020
2006 - 2019 Copyright by rt-thread team
Hello RT-Thread!
msh >help
RT-Thread shell commands:
list_timer       - list timer in system
list_mailbox     - list mail box in system
list_sem         - list semaphore in system
list_thread      - list thread
version          - show RT-Thread version information
ps               - List threads in the system.
help             - RT-Thread shell help.
nsdk             - msh nuclei sdk demo

msh >ps
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
tshell     6  ready   0x00000178 0x00001000    09%   0x00000008 000
tidle      7  ready   0x00000078 0x0000018c    30%   0x00000020 000
main       2  suspend 0x000000b8 0x00000200    35%   0x00000013 000
msh >nsdk
Hello Nuclei SDK!
msh >