FPGA Development with wujian100 SoC - Part Nine: Working on Bugs
Bug issue.
FPGA Development with wujian100 SoC
Part Nine: Working on Bugs
Author: 加一(Jiayi)
Something to say
Recently I participate a contest named Integrate Circuit Innovation Contest which requires me to use WJ100 developed by Ali Inc. team t-head and a FPGA develop board with Xlinx XC7A200TR3B Core. It’s not my first time to cope with FPGA but still, I find it difficult to interpret Verilog Code and make the FPGA works. Luckily, with the help of WJ100 Sdk and CDK(C-sky Develop Kit) which developed by Ali Inc. we could jump the Verilog and long waiting synthesizing part directly to use the pre-setted circuit and easy writing C to develop.
About WJ100
T-Head’s Wujian SoC Platform utilizes the cloud-terminal-integration design philosophy that fuses software and hardware. Full stack integration of chips, operating systems and algorithms enables customers to develop chip products that can be mass-production.
Low power consumption: User-defined power consumption scenarios, with standby power consumption of less than 1uA, and operating power consumption of less than 100uA/MHz
According to the official sites of t-head Inc., WJ100 is a low cost and high power efficiency SoC, which barely means that it could be easily deployed on any chips and consumes lower power.
However, as I talked before, it is a open source project and as I believed, the real function of this SoC is to simplify the use of FPGA and to offer the developer a brand new way to develop: integrate Soc and FPGA to deal with some projects which require both power efficiency and fast steady frequency.
- related websites t-head
How to use WJ100 SoC
This tutorial is for those who utilize vivado to generate bitstream file and CDK to develop your own projects on Windows.
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For Part 1 Bitsream Generation please refer to Part_1_Bitstream_Generation.
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For Part 2 CDK Toolkit and wujian100 SDK please refer to Part_2_CDK_Toolkit&Wujian100_SDK.
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For Part 3 Start a New Project on CDK please refer to Part_3_Start_a_New_Project_on_CDK
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For Part 4 Hello World please refer to Part4_Hello_World
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For Part 5 GPIO please refer to Part5_GPIO
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For Part 6 UART please refer to Part6_UART
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For Part 7 TIMER please refer to Part7_TIMER
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For Part 8 Interrupt please refer to Part8_VIC
Part 9 Bugs Issue
001 return problem
| category | compiler bug |
| solved | NO |
| confirmed | YES |
| Discription | As shown in code block, delay_flag will become 0 when interrupt is triggered. However, after I tested several times, whatever the judgment condition is, i.e. delay_flag <= 0 or delay_flag != 1, the function just seems to stuck with while. And further experiments conducted by adding a printf function in the if statement shows that the judgement would work so that the only bug is about return statement. More informantion is digged when I see what is wrong with the assemble language and I found there is no jmp to return to the function where it originally is but a jmp statement to return to something implements the infinite while loop. Further experiments showns that this problem occurs when there are more than 3 times of loop in while and then it will enter some infinite loop. |
while(1){
if (delay_flag == 0) {
return 0;
}
}
Feel free to comment for your opinions or bugs you have found, I will continuously update this bug issue article.
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