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Fix size for compression mapping data #58

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Fix size for compression mapping data #58

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425794b
fix size for compression mapping data (requires whole 32KB for 16MB r…
mullermarian Jul 23, 2024
1b42b4f
fix mapping table length
mullermarian Jul 23, 2024
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2 changes: 1 addition & 1 deletion sw/picocart64_v1/memmap_custom.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -263,7 +263,7 @@ SECTIONS
*(.n64_rom.header)
. = 16;
*(.n64_rom.mapping)
. = 32768;
. = (32768 + 16);
*(.n64_rom)
} > N64_ROM
}
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2 changes: 1 addition & 1 deletion sw/picocart64_v1/n64_pi_task.c
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Expand Up @@ -94,7 +94,7 @@ void n64_pi_run(void)
do {
// Pre-fetch from the address
#if COMPRESSED_ROM
uint32_t chunk_index = rom_mapping[(last_addr & 0xFFFFFF) >> COMPRESSION_SHIFT_AMOUNT];
uint16_t chunk_index = rom_mapping[(last_addr & 0xFFFFFF) >> COMPRESSION_SHIFT_AMOUNT];
const uint16_t *chunk_16 = (const uint16_t *)rom_chunks[chunk_index];
next_word = swap8(chunk_16[(last_addr & COMPRESSION_MASK) >> 1]);
#else
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2 changes: 1 addition & 1 deletion sw/picocart64_v1/rom_vars.h
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
#define MAPPING_TABLE_LEN (16384 - 8)
#define MAPPING_TABLE_LEN (16384)

#define COMPRESSED_ROM 1
#define COMPRESSION_SHIFT_AMOUNT 10
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