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| author | Takamichi Horikawa <myon@myon98.net> | 2021-12-04 13:41:35 +0900 |
|---|---|---|
| committer | Takamichi Horikawa <myon@myon98.net> | 2021-12-04 13:41:35 +0900 |
| commit | 74fe5e24beb14b00ce3d69e5a3010c520d4bf8e5 (patch) | |
| tree | 7977c7d2df8f02bdea1a2fc0dd50df000eb044e6 /01-ctest/main.c | |
Initial: vram write test
Diffstat (limited to '01-ctest/main.c')
| -rw-r--r-- | 01-ctest/main.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/01-ctest/main.c b/01-ctest/main.c new file mode 100644 index 0000000..fb7ec73 --- /dev/null +++ b/01-ctest/main.c @@ -0,0 +1,18 @@ +#include <stdint.h> + +enum { + DISPH = 480, + DISPW = 800, +}; + +void cstart(void) +{ + uint16_t * const dptr = (uint16_t *)0x14800000; + + for (int y = 0; y < DISPH; y++) { + for (int x = 0; x < DISPW; x++) { + dptr[y*DISPW+x] = ((x&1)^(y&1)) ? 0 : 0xffff; + } + } +} + |