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Also, move the demo drawing into the stm-vga app and out of the vga
driver.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This allows for high priority interrupts (priority 0) to run, even
when other interrupts are blocked. Code executing in such interrupt
handlers must not attempt to control task execution as that will race
with the scheduler.
Signed-off-by: Keith Packard <keithp@keithp.com>
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If we load the scanline register while DMA is running, it doesn't
actually get reloaded until after the first transfer from the next
line, leaving a weird jog in the middle of the screen.
Also flip to SPI1, as Bdale is using that on the 1802 board.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Generates vsync/hsync using timers and pixel data using the SPI port.
320x240 video using 640x480 mode and a 24MHz "pixel" clock.
Includes the beginings of rendering code for the frame buffer,
including bitblt, solid fill and text with a 5x7 font.
Signed-off-by: Keith Packard <keithp@keithp.com>
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