giomba/ceda2vga
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Vertical dashed line with DMA. WIP.

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This commit is contained in:
giomba 2022-10-16 00:09:51 +02:00
parent 1272be8914
commit d40f208ce0
2 changed files with 33 additions and 19 deletions
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8
CMakeLists.txt
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@ -10,12 +10,6 @@ set(CMAKE_CXX_STANDARD 17)
# Initialize SDK
pico_sdk_init()
# include(example_auto_set_url.cmake)
# Add blink example
# add_subdirectory(blink)
# Add hello world example
# add_subdirectory(hello_world)
add_compile_options(-Wall
-Wno-format # int != int32_t as far as the compiler is concerned because gcc has int32_t as long int
-Wno-unused-function # we have some for the docs that aren't called
@ -41,6 +35,8 @@ pico_add_extra_outputs(ceda2vga)
target_link_libraries(ceda2vga
pico_stdlib
hardware_pio
hardware_dma
hardware_irq
)
# add url via pico_set_program_url

44
src/main.c
View File

@ -8,6 +8,7 @@
*/
#include "hardware/clocks.h"
#include "hardware/dma.h"
#include "hardware/pio.h"
#include "hardware/pll.h"
#include "hardware/structs/pio.h"
@ -107,6 +108,15 @@ void setup_clocks(void)
clock_configure(clk_peri, 0, CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLK_SYS, 126 * MHZ, 126 * MHZ);
}
static int dma_channel;
void dma_handler()
{
dma_hw->ints0 = 1 << dma_channel;
dma_channel_set_read_addr(dma_channel, &frames[0].data[5120], true);
// printf(".");
}
int main()
{
setup_clocks();
@ -116,7 +126,7 @@ int main()
// "draw" an horizontal dotted line (?)
for (unsigned int c = 0; c < 5; c++)
{
frames[0].data[80 * 64 + 30 + c] = 0x55;
frames[0].data[80 * 64 + 60 + c] = 0x55;
}
// PIO and state machines
@ -145,22 +155,30 @@ int main()
// VGA pixel program
uint offset0 = pio_add_program(pio, &vga_free_run_program);
uint sm0 = pio_claim_unused_sm(pio, false);
uint sm0 = pio_claim_unused_sm(pio, true);
printf("Starting VGA pixel machine on %u...\n", sm0);
vga_pixel_program_init(pio, sm0, offset0);
pio_sm_put_blocking(pio, sm0, 640 - 1);
printf("Setting up DMA...\n");
dma_channel = dma_claim_unused_channel(true);
dma_channel_config dma_config = dma_channel_get_default_config(dma_channel);
channel_config_set_transfer_data_size(&dma_config, DMA_SIZE_32);
channel_config_set_read_increment(&dma_config, true);
channel_config_set_write_increment(&dma_config, false);
channel_config_set_dreq(&dma_config, DREQ_PIO0_TX2);
dma_channel_set_irq0_enabled(dma_channel, true);
irq_set_exclusive_handler(DMA_IRQ_0, dma_handler);
irq_set_enabled(DMA_IRQ_0, true);
dma_channel_configure(dma_channel, &dma_config, &pio0_hw->txf[2], &frames[0].data[0], 80, true);
// dma_handler();
printf("Start!\n");
while (true)
{
for (size_t i = 0; i < sizeof(frames[0].data);)
{
// feed pixel machine
pio_sm_put_blocking(pio, sm0, frames[0].data[i++]);
// printf("%d.", i);
}
// sleep_ms(1000);
// printf(".");
}
for (;;)
;
}