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