MTX Registers: Difference between revisions
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Update MTX bits and interrupts |
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| | | [[#MTX_IE|MTX_IE]] | ||
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==Matrix unit== | ==Matrix unit== | ||
There are two matrix units, one at +0x200, and the other one at +0x300 | There are two matrix units, one at +0x200 for vertical (Y) scaling, and the other one at +0x300 for horizontal (X) scaling. | ||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
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|- | |- | ||
| 1 | | 1 | ||
| | | Enable vertical matrix | ||
|- | |- | ||
| 2 | | 2 | ||
| | | Enable horizontal matrix | ||
|- | |- | ||
| | | 4 | ||
| ??? | | ??? | ||
|- | |- | ||
| | | 5 | ||
| ??? | | ??? | ||
|- | |- | ||
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|- | |- | ||
| 10-11 | | 10-11 | ||
| Output | | Output framebuffer rotation: 0 = normal, 1 = 90° CW (right), 2 = 180° CW (upside down, not mirrored), 3 = 270° CW (left) | ||
|- | |- | ||
| 12 | | 12 | ||
| | | Output tiling for use with the GPU. When set, the output width and height must be a multiple of 8. | ||
|- | |- | ||
| 15 | | 15 | ||
| | | Start bit (setting this will eventually raise MTX interrupt 0) | ||
|- | |- | ||
| 16 | | 16 | ||
| ? | | Data still available flag (?) | ||
|- | |- | ||
|} | |} | ||
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|- | |- | ||
| 0-8 | | 0-8 | ||
| Output framebuffer width - 1 is written here | | Output framebuffer width - 1 is written here, 1 <= width <= 512 | ||
|- | |- | ||
| 16-25 | | 16-25 | ||
| Output framebuffer height - 1 is written here | | Output framebuffer height - 1 is written here, 1 <= height <= 512 | ||
|- | |- | ||
|} | |} | ||
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Reading this register will return pending interrupts. | Reading this register will return pending interrupts. | ||
Writing this register will acknowledge the | Writing this register will acknowledge pending interrupts where the bits are set. | ||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
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|- | |- | ||
| 0 | | 0 | ||
| | | FIFO ready (signal to start DMA) | ||
|- | |- | ||
| 1 | | 1 | ||
| | | FIFO overrun(?) (occurs if DMA is too slow) | ||
|- | |- | ||
| 2 | | 2 | ||
| | | FIFO underrun(?) (occurs on VBlank) | ||
|- | |- | ||
|} | |} | ||
==MTX_IE== | |||
Interrupt Enable for the above interrupts. | |||
Latest revision as of 01:07, 2 April 2020
These registers are responsible for controlling how framebuffer data can be DMA'd from the DS GPU, and also for configuring the upscaling matrix.
Registers
The physical address can be calculated by subtracting 0xEB00000 from the virtual address.
Control
| VAddress | Name | Width |
|---|---|---|
| 0x1EC1x000 | MTX_CNT | 4 |
| 0x1EC1x004 | MTX_SIZE | 4 |
| 0x1EC1x008 | MTX_ACK | 4 |
| 0x1EC1x00C | MTX_IE | 4 |
| 0x1EC1x020 | ??? | 4 |
Matrix unit
There are two matrix units, one at +0x200 for vertical (Y) scaling, and the other one at +0x300 for horizontal (X) scaling.
| VAddress | Name | Width | Description |
|---|---|---|---|
| 0x1EC1xn00 | KRN_WIDTH | 4 | Kernel width - 1 is written here, 1 <= width <= 8
This decides how many pixels are written each batch. |
| 0x1EC1xn04 | KRN_PATTERN_BITS | 4 | If the corresponding bit for the current batch iteration index is set then a new pixel is read.
The amount of set bits determine how many pixels are read each batch. Any bit indexes past KRN_WIDTH are ignored. This value is 8 bits, but it has to be written with a 32bit write. |
| 0x1EC1xn40 | KRN_MTX | 0xC0 | int kerneldata[6][8]; - matrix data is written here, height is always 6 |
Descriptions
MTX_CNT
| Bit(s) | Description |
|---|---|
| 0 | Enable bit |
| 1 | Enable vertical matrix |
| 2 | Enable horizontal matrix |
| 4 | ??? |
| 5 | ??? |
| 8-9 | Input pixel mode? 0 = 4byte color, 1 = 3byte color, 2 = 2byte color, 3 = 2byte color |
| 10-11 | Output framebuffer rotation: 0 = normal, 1 = 90° CW (right), 2 = 180° CW (upside down, not mirrored), 3 = 270° CW (left) |
| 12 | Output tiling for use with the GPU. When set, the output width and height must be a multiple of 8. |
| 15 | Start bit (setting this will eventually raise MTX interrupt 0) |
| 16 | Data still available flag (?) |
MTX_SIZE
| Bit(s) | Description |
|---|---|
| 0-8 | Output framebuffer width - 1 is written here, 1 <= width <= 512 |
| 16-25 | Output framebuffer height - 1 is written here, 1 <= height <= 512 |
MTX_ACK
Reading this register will return pending interrupts. Writing this register will acknowledge pending interrupts where the bits are set.
| Bit(s) | Description |
|---|---|
| 0 | FIFO ready (signal to start DMA) |
| 1 | FIFO overrun(?) (occurs if DMA is too slow) |
| 2 | FIFO underrun(?) (occurs on VBlank) |
MTX_IE
Interrupt Enable for the above interrupts.