96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* Copyright (c) 2024 Scott Duensing, scott@kangaroopunch.com
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef WITHOUT_DMA
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#ifndef F256LIB_AMALGAMATED_BUILD
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#include "f_dma.h"
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#endif
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//static void dmaWait(void);
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void dmaFill(uint32_t start, uint32_t length, byte value) {
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while (PEEKW(RAST_ROW_L) != 482); // Wait for VBL.
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POKE(DMA_CTRL, DMA_CTRL_FILL | DMA_CTRL_ENABLE);
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POKE(DMA_FILL_VAL, value);
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POKEA(DMA_DST_ADDR, start);
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POKEA(DMA_COUNT, length);
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POKE(DMA_CTRL, PEEK(DMA_CTRL) | DMA_CTRL_START);
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// dmaWait();
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}
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void dma2dFill(uint32_t start, uint16_t width, uint16_t height, uint16_t stride, byte value) {
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while (PEEKW(RAST_ROW_L) != 482); // Wait for VBL.
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asm("sei");
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POKE(DMA_CTRL, DMA_CTRL_2D | DMA_CTRL_FILL | DMA_CTRL_ENABLE);
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POKE(DMA_FILL_VAL, value);
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POKEA(DMA_DST_ADDR, start);
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POKEW(DMA_WIDTH, width);
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POKEW(DMA_HEIGHT, height);
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POKEW(DMA_STRIDE_DST, stride);
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POKE(DMA_CTRL, PEEK(DMA_CTRL) | DMA_CTRL_START);
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("nop");
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asm("cli");
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// dmaWait();
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}
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void dmaReset(void) {
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// Disable DMA.
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POKE(DMA_CTRL, 0);
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}
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/*
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static void dmaWait(void) {
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// ***FIX*** This whole block seems unneeded if DMA halts the CPU while it transfers.
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// First, wait for DMA to be complete.
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while (PEEK(DMA_STATUS) & DMA_STAT_BUSY)
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// Spin our wheels.
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;
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POKE(DMA_CTRL, 0);
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// Then wait for a VBL because two DMAs per frame will crash.
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//graphicsWaitVerticalBlank();
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}
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*/
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#endif
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