60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
#include "gameboy.h"
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//=================================================================================================
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//
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// GAMEBOY operations
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// This file includes all the gameboy functions possible to be called from the gameboy dictionary.
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//
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// See description of the commands contained here in shared/shared_dictionaries.h
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//
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//=================================================================================================
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/* Desc:Function takes an opcode which was transmitted via USB
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* then decodes it to call designated function.
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* shared_dict_gameboy.h is used in both host and fw to ensure opcodes/names align
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* Pre: Macros must be defined in firmware pinport.h
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* opcode must be defined in shared_dict_gameboy.h
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* Post:function call complete.
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* Rtn: SUCCESS if opcode found and completed, error if opcode not present or other problem.
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*/
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uint8_t gameboy_call( uint8_t opcode, uint8_t miscdata, uint16_t operand, uint8_t *rdata )
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{
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#define RD_LEN 0
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#define RD0 1
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#define RD1 2
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#define BYTE_LEN 1
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#define HWORD_LEN 2
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switch (opcode) {
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// //no return value:
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case DMG_WR:
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dmg_wr( operand, miscdata );
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break;
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//8bit return values:
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case DMG_RD:
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rdata[RD_LEN] = BYTE_LEN;
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rdata[RD0] = dmg_rd( operand );
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break;
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default:
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//macro doesn't exist
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return ERR_UNKN_GAMEBOY_OPCODE;
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}
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return SUCCESS;
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}
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uint8_t dmg_rd( uint16_t addr )
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{
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return 0xAA;
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}
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void dmg_wr( uint16_t addr, uint8_t data )
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{
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return;
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}
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