Mon, 06 Dec 2010 01:43:04 +0000
fix side-select bug in WDC FDC driver, was causing all reads to occur on side0... now the Loader boots!
Loader will boot, but immediately gives up on the floppy drive... Not sure why.
1 #ifndef _WD279X_H
2 #define _WD279X_H
4 #include <stdbool.h>
5 #include <stddef.h>
6 #include <stdint.h>
7 #include <stdio.h>
9 /// WD279x registers
10 typedef enum {
11 WD2797_REG_STATUS = 0, ///< Status register
12 WD2797_REG_COMMAND = 0, ///< Command register
13 WD2797_REG_TRACK = 1, ///< Track register
14 WD2797_REG_SECTOR = 2, ///< Sector register
15 WD2797_REG_DATA = 3 ///< Data register
16 } WD2797_REG;
18 /// WD279x emulator error codes
19 typedef enum {
20 WD2797_ERR_OK = 0, ///< Operation succeeded
21 WD2797_ERR_BAD_GEOM = -1, ///< Bad geometry, or image file too small
22 WD2797_ERR_NO_MEMORY = -2 ///< Out of memory
23 } WD2797_ERR;
25 typedef struct {
26 // Current track, head and sector
27 int track, head, sector;
28 // Geometry of current disc
29 int geom_secsz, geom_spt, geom_heads, geom_tracks;
30 // IRQ status, level and edge sensitive.
31 // Edge sensitive is cleared when host polls the IRQ status.
32 // Level sensitive is cleared when emulated CPU polls the status reg or writes a new cmnd.
33 // No EDGE sensitive interrupts will be issued unless the LEVEL SENSITIVE IRQ is clear.
34 bool irql, irqe;
35 // Status of last command
36 uint8_t status;
37 // Last command uses DRQ bit?
38 bool cmd_has_drq;
39 // The last value written to the data register
40 uint8_t data_reg;
41 // Last step direction. -1 for "towards zero", 1 for "away from zero"
42 int last_step_dir;
43 // Data buffer, current DRQ pointer and length
44 uint8_t *data;
45 size_t data_pos, data_len;
46 // Current disc image file
47 FILE *disc_image;
48 } WD2797_CTX;
50 /**
51 * @brief Initialise a WD2797 context.
52 * @param ctx WD2797 context.
53 *
54 * This must be run once when the context is created.
55 */
56 void wd2797_init(WD2797_CTX *ctx);
58 /**
59 * @brief Reset a WD2797 context.
60 * @param ctx WD2797 context.
61 *
62 * This should be run if the WD2797 needs to be reset (nRST line toggled).
63 */
64 void wd2797_reset(WD2797_CTX *ctx);
66 /**
67 * Deinitialise a WD2797 context.
68 * @param ctx WD2797 context.
69 */
70 void wd2797_done(WD2797_CTX *ctx);
72 /**
73 * @brief Read IRQ Rising Edge status. Clears Rising Edge status if it is set.
74 * @note No more IRQs will be sent until the Status Register is read, or a new command is written to the CR.
75 * @param ctx WD2797 context.
76 */
77 bool wd2797_get_irq(WD2797_CTX *ctx);
79 /**
80 * @brief Read DRQ status.
81 * @param ctx WD2797 context.
82 */
83 bool wd2797_get_drq(WD2797_CTX *ctx);
85 /**
86 * @brief Assign a disc image to the WD2797.
87 * @param ctx WD2797 context.
88 * @param fp Disc image file, already opened in "r+b" mode.
89 * @param secsz Sector size: either 128, 256, 512 or 1024.
90 * @param spt Sectors per track.
91 * @param heads Number of heads (1 or 2).
92 * @return Error code; WD279X_E_OK if everything worked OK.
93 */
94 WD2797_ERR wd2797_load(WD2797_CTX *ctx, FILE *fp, int secsz, int spt, int heads);
96 /**
97 * @brief Deassign the current image file.
98 * @param ctx WD2797 context.
99 */
100 void wd2797_unload(WD2797_CTX *ctx);
102 /**
103 * @brief Read WD279x register.
104 * @param ctx WD2797 context
105 * @param addr Register address (0, 1, 2 or 3)
106 */
107 uint8_t wd2797_read_reg(WD2797_CTX *ctx, uint8_t addr);
109 /**
110 * @brief Write WD279X register
111 * @param ctx WD2797 context
112 * @param addr Register address (0, 1, 2 or 3)
113 * @param val Value to write
114 */
115 void wd2797_write_reg(WD2797_CTX *ctx, uint8_t addr, uint8_t val);
118 #endif