Term
| Which video modes use palettes? |
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Definition
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Term
| Which of these is true about GBA architecture? |
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Definition
Processor - 32-bit ARM7 16.7 MHz
Memory = 3,072 kBits
Display - 240 X 160
Colors - 32,768
No Operating System
Complete control over the hardware at lowest level
Maximum Control and Maximum Responsibility
Each EXE must contain all code
Changes happen by writing to hardware registers
Writing a bit in Video Memory will change the display |
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Term
| DMA can be used to transfer memory the following ways |
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Definition
16
32
increment after transfer
decrement after transfer
Leave unchanged
Transfer Immediately
Transfer on HBlank
Transfer on VBlank
increments by 2 or 4 bytes
increment then reset |
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Term
| Which of these is true about IWRAM |
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Definition
fastest memory in GBA
Ideal for running ARM code
Only memory directly accessible on 32 bit internal data bus and 32 bits at a time |
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Term
| How many keys or buttons does the GBA have for input? |
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Definition
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Term
| When accessing the Game Cartridge ROM, speed is represented by 3/1. What do these numbers mean? |
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Definition
| Select an address/transfer data |
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Term
| How many total palettes can be available at any one time? |
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Definition
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Term
| The GBA processer has which of these? |
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Definition
Hardware Multiply
Three stage pipeline
No hardware divide or floating point support |
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Term
| How much data can you transfer with DMA in each count? |
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Definition
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Term
| Both the screen refresh rate and your game's fps will be constant at 60. True or False, and why? |
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Definition
| False. It's drawing at 60fps but not refreshing at 60fps. |
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Term
| What sequence would be used to get 1 bit for each key? |
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Definition
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Term
| In the RGB macro, what does 0x1F do? |
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Definition
| Limit the three colors to 5 bits |
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Term
| Since GBA CPU is a CISC processor, we can manipulate multiple data items in memory at once. True or false? |
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Definition
| The GBA processor is a RISC processor, so false |
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Term
| The DMA controller takes over the hardware by halting the CPU |
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Definition
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Term
| Which could you add at the begining of the Wait4VBlank function code to ensure that if you call it twice in a row, you would wait for the next vertical blank? |
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Definition
| While(REG_VCOUNT == 160){} |
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Term
In video 4, you can write one byte of pixel info into video memory using one assignment instruction
videobuffer[y * 240 + x] = color; |
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Definition
| FALSE, video memory must be written in shorts. Pull out individual short find out what byte to change then write that short back. |
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Term
| What is the system bus bit depth of the GBA |
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Definition
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Term
| When you did the double buffer lab using video mode 3, which function needed to be called after the Draw_WaitVBlank function? |
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Definition
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Term
| Which CPU does the GBA use? |
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Definition
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Term
What is the purpose of this code?
#define REG_VCOUNT *(volatile unsigned short*)0x04000006
WHile REG_VCOUNT != 160{} |
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Definition
| Wait until GBA is on the first line of the vertical blank. |
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Term
For the GBA's color, there are bits for BGR
How many bits are for each color? |
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Definition
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Term
| Which line of code would draw a pixel correctly in video mode 4, for an odd x? |
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Definition
| videoBuffer[offset] = (color << 8) | videoBuffer[offset] & 0x00FF); |
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Term
| Which hardware register do you change to force the display to go blank? |
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Definition
| 0x4000000 REG_DISPCNT (display control) |
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Term
| What are the different byte widths that can be copied per count using DMA |
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Definition
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Term
| Which GBA color format values are the same? |
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Definition
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Term
| The game's executable is run directly from the cartridge, true or false? |
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Definition
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Term
| You will potentially cause visual artifacts if you update video memory during the vertical draw period. True or False? |
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Definition
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Term
| The GBA screen refreshes at fixed intervals with both horizontal and vertical blank periods. |
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Definition
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Term
| Which one of these do you not enable in the display control register? |
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Definition
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Term
| Which code waits for the begining of the VBlank period? |
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Definition
| While(REG_VCOUNT != 160){} |
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Term
| Which video modes have a hardware double buffer? |
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Definition
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Term
| What are the dimensions in pixels of the GBA screen? |
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Definition
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