Amneesh Singh
58a503d2c4
added rendering for modes 3,4,5 also changed how memory structuring works Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
40 lines
990 B
C++
40 lines
990 B
C++
#include <bit>
|
|
#include <cstdint>
|
|
|
|
namespace matar {
|
|
// NOLINTBEGIN(cppcoreguidelines-avoid-c-arrays)
|
|
struct DmaControl {
|
|
struct {
|
|
int : 4; // this is supposed to be 5 bits, however, to align the struct
|
|
// to 16 bits, we will adjust for the first LSB in the
|
|
// read/write
|
|
uint8_t dst_adjustment : 2;
|
|
uint8_t src_adjustment : 2;
|
|
bool repeat : 1;
|
|
bool transfer_32 : 1;
|
|
int : 1;
|
|
uint8_t start_timing : 2;
|
|
bool irq_enable : 1;
|
|
bool enable : 1;
|
|
} value;
|
|
|
|
uint16_t read() const { return std::bit_cast<uint16_t>(value) << 1; };
|
|
void write(uint16_t raw) {
|
|
value = std::bit_cast<decltype(value)>(static_cast<uint16_t>(raw >> 1));
|
|
};
|
|
};
|
|
|
|
struct Dma {
|
|
using u16 = uint16_t;
|
|
|
|
struct {
|
|
u16 source[2];
|
|
u16 destination[2];
|
|
u16 word_count;
|
|
DmaControl control;
|
|
} channels[4];
|
|
};
|
|
// NOLINTEND(cppcoreguidelines-avoid-c-arrays)
|
|
|
|
}
|