1.1 diff -r 4c85846b09cd -r a392eb8f9806 src/wd2010.h 1.2 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.3 +++ b/src/wd2010.h Sat Nov 17 19:18:29 2012 +0000 1.4 @@ -0,0 +1,127 @@ 1.5 +#ifndef _WD2010_H 1.6 +#define _WD2010_H 1.7 + 1.8 +#include <stdbool.h> 1.9 +#include <stddef.h> 1.10 +#include <stdint.h> 1.11 +#include <stdio.h> 1.12 + 1.13 +/// WD2010 registers 1.14 +typedef enum { 1.15 + WD2010_REG_ERROR = 1, ///< Error register 1.16 + WD2010_REG_WRITE_PRECOMP_CYLINDER = 1, ///< Write precompensation cylinder 1.17 + ///< register 1.18 + WD2010_REG_SECTOR_COUNT = 2, ///< Sector count register 1.19 + WD2010_REG_SECTOR_NUMBER = 3, ///< Sector number register 1.20 + WD2010_REG_CYLINDER_LOW = 4, ///< Low byte of cylinder 1.21 + WD2010_REG_CYLINDER_HIGH = 5, ///< High byte of cylinder 1.22 + WD2010_REG_SDH = 6, ///< Sector size, drive, and head 1.23 + WD2010_REG_STATUS = 7, ///< Status register 1.24 + WD2010_REG_COMMAND = 7, ///< Command register 1.25 +} WD2010_REG; 1.26 + 1.27 +/// WD2010 emulator error codes 1.28 +typedef enum { 1.29 + WD2010_ERR_OK = 0, ///< Operation succeeded 1.30 + WD2010_ERR_BAD_GEOM = -1, ///< Bad geometry, or image file too small 1.31 + WD2010_ERR_NO_MEMORY = -2 ///< Out of memory 1.32 +} WD2010_ERR; 1.33 + 1.34 +typedef struct { 1.35 + // Current track, head and sector 1.36 + int track, head, sector; 1.37 + // Geometry of current disc 1.38 + int geom_secsz, geom_spt, geom_heads, geom_tracks; 1.39 + // IRQ status 1.40 + bool irq; 1.41 + // Status of last command 1.42 + uint8_t status; 1.43 + // Error resgister 1.44 + uint8_t error_reg; 1.45 + // Cylinder number registers 1.46 + uint8_t cylinder_high_reg, cylinder_low_reg; 1.47 + // SDH register (sets sector size, drive number, and head number) 1.48 + uint8_t sdh; 1.49 + // Sector number and count registers 1.50 + int sector_number, sector_count; 1.51 + // Last command has the multiple sector flag set? 1.52 + bool multi_sector; 1.53 + // Last command uses DRQ bit? 1.54 + bool cmd_has_drq; 1.55 + // Current write is a format? 1.56 + bool formatting; 1.57 + // Data buffer, current DRQ pointer and length 1.58 + uint8_t *data; 1.59 + size_t data_pos, data_len; 1.60 + // Current disc image file 1.61 + FILE *disc_image; 1.62 + // LBA at which to start writing 1.63 + int write_pos; 1.64 + // Flag to allow delaying DRQ 1.65 + bool drq; 1.66 +} WD2010_CTX; 1.67 + 1.68 +/** 1.69 + * @brief Initialise a WD2010 context. 1.70 + * @param ctx WD2010 context. 1.71 + * 1.72 + * This must be run once when the context is created. 1.73 + */ 1.74 +int wd2010_init(WD2010_CTX *ctx, FILE *fp, int secsz, int spt, int heads); 1.75 + 1.76 +/** 1.77 + * @brief Reset a WD2010 context. 1.78 + * @param ctx WD2010 context. 1.79 + * 1.80 + * This should be run if the WD2010 needs to be reset (MR/ line toggled). 1.81 + */ 1.82 +void wd2010_reset(WD2010_CTX *ctx); 1.83 + 1.84 +/** 1.85 + * Deinitialise a WD2010 context. 1.86 + * @param ctx WD2010 context. 1.87 + */ 1.88 +void wd2010_done(WD2010_CTX *ctx); 1.89 + 1.90 +/** 1.91 + * @brief Read IRQ Rising Edge status. 1.92 + * @param ctx WD2010 context. 1.93 + */ 1.94 +bool wd2010_get_irq(WD2010_CTX *ctx); 1.95 + 1.96 +/** 1.97 + * @brief Read DRQ status. 1.98 + * @param ctx WD2010 context. 1.99 + */ 1.100 +bool wd2010_get_drq(WD2010_CTX *ctx); 1.101 + 1.102 +/** 1.103 + * @brief Read WD2010 register. 1.104 + * @param ctx WD2010 context 1.105 + * @param addr Register address (0, 1, 2, 3, 4, 5, 6, 7, or 8) 1.106 + */ 1.107 +uint8_t wd2010_read_reg(WD2010_CTX *ctx, uint8_t addr); 1.108 + 1.109 +/** 1.110 + * @brief Write WD2010 register 1.111 + * @param ctx WD2010 context 1.112 + * @param addr Register address (0, 1, 2, 3, 4, 5, 6, 7, or 8) 1.113 + * @param val Value to write 1.114 + */ 1.115 +void wd2010_write_reg(WD2010_CTX *ctx, uint8_t addr, uint8_t val); 1.116 + 1.117 +/** 1.118 + * @brief Read a data byte from the data buffer 1.119 + * @param ctx WD2010 context 1.120 + */ 1.121 +uint8_t wd2010_read_data(WD2010_CTX *ctx); 1.122 + 1.123 +/** 1.124 + * @brief Write a value to the data buffer 1.125 + * @param ctx WD2010 context 1.126 + * @param val Value to write 1.127 + */ 1.128 +void wd2010_write_data(WD2010_CTX *ctx, uint8_t val); 1.129 + 1.130 +void wd2010_dma_miss(WD2010_CTX *ctx); 1.131 +#endif