msu1.c 7.7 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258
  1. #include <string.h>
  2. #include "config.h"
  3. #include "uart.h"
  4. #include "ff.h"
  5. #include "diskio.h"
  6. #include "spi.h"
  7. #include "fpga_spi.h"
  8. #include "cli.h"
  9. #include "fileops.h"
  10. #include "msu1.h"
  11. #include "snes.h"
  12. #include "timer.h"
  13. #include "smc.h"
  14. FIL msufile;
  15. extern snes_romprops_t romprops;
  16. int msu1_check_reset(void) {
  17. static tick_t rising_ticks;
  18. static uint8_t resbutton=0, resbutton_prev=0;
  19. resbutton = get_snes_reset();
  20. if(resbutton && !resbutton_prev) { /* push */
  21. rising_ticks = getticks();
  22. } else if(resbutton && resbutton_prev) { /* hold */
  23. if(getticks() > rising_ticks + 99) {
  24. return 1;
  25. }
  26. }
  27. resbutton_prev = resbutton;
  28. return 0;
  29. }
  30. int msu1_check(uint8_t* filename) {
  31. /* open MSU file */
  32. strcpy((char*)file_buf, (char*)filename);
  33. strcpy(strrchr((char*)file_buf, (int)'.'), ".msu");
  34. printf("MSU datafile: %s\n", file_buf);
  35. if(f_open(&msufile, (const TCHAR*)file_buf, FA_READ) != FR_OK) {
  36. printf("MSU datafile not found\n");
  37. return 0;
  38. }
  39. romprops.fpga_features |= FEAT_MSU1;
  40. return 1;
  41. }
  42. int msu1_loop() {
  43. /* it is assumed that the MSU file is already opened by calling msu1_check(). */
  44. UINT bytes_read = 1024;
  45. UINT bytes_read2 = 1;
  46. FRESULT res;
  47. set_dac_vol(0x00);
  48. spi_set_speed(SSP_CLK_DIVISOR_FAST);
  49. while(fpga_status() & 0x4000);
  50. uint16_t fpga_status_prev = fpga_status();
  51. uint16_t fpga_status_now = fpga_status();
  52. uint16_t dac_addr = 0;
  53. uint16_t msu_addr = 0;
  54. uint8_t msu_repeat = 0;
  55. uint16_t msu_track = 0;
  56. uint32_t msu_offset = 0;
  57. uint32_t msu_loop_point = 0;
  58. uint32_t msu_page1_start = 0x0000;
  59. uint32_t msu_page2_start = 0x2000;
  60. uint32_t msu_page_size = 0x2000;
  61. set_msu_addr(0x0);
  62. msu_reset(0x0);
  63. ff_sd_offload=1;
  64. sd_offload_tgt=2;
  65. f_lseek(&msufile, 0L);
  66. ff_sd_offload=1;
  67. sd_offload_tgt=2;
  68. f_read(&msufile, file_buf, 16384, &bytes_read2);
  69. set_dac_addr(dac_addr);
  70. dac_pause();
  71. dac_reset();
  72. /* audio_start, data_start, 0, audio_ctrl[1:0], ctrl_start */
  73. while(1){
  74. cli_entrycheck();
  75. fpga_status_now = fpga_status();
  76. /* Data buffer refill */
  77. if((fpga_status_now & 0x2000) != (fpga_status_prev & 0x2000)) {
  78. DBG_MSU1 printf("data\n");
  79. uint8_t pageno = 0;
  80. if(fpga_status_now & 0x2000) {
  81. msu_addr = 0x0;
  82. msu_page1_start = msu_page2_start + msu_page_size;
  83. pageno = 1;
  84. } else {
  85. msu_addr = 0x2000;
  86. msu_page2_start = msu_page1_start + msu_page_size;
  87. pageno = 2;
  88. }
  89. set_msu_addr(msu_addr);
  90. sd_offload_tgt=2;
  91. ff_sd_offload=1;
  92. res = f_read(&msufile, file_buf, 8192, &bytes_read2);
  93. DBG_MSU1 printf("data buffer refilled. res=%d page1=%08lx page2=%08lx\n", res, msu_page1_start, msu_page2_start);
  94. }
  95. /* Audio buffer refill */
  96. if((fpga_status_now & 0x4000) != (fpga_status_prev & 0x4000)) {
  97. if(fpga_status_now & 0x4000) {
  98. dac_addr = 0;
  99. } else {
  100. dac_addr = MSU_DAC_BUFSIZE/2;
  101. }
  102. set_dac_addr(dac_addr);
  103. sd_offload_tgt=1;
  104. ff_sd_offload=1;
  105. f_read(&file_handle, file_buf, MSU_DAC_BUFSIZE/2, &bytes_read);
  106. }
  107. if(fpga_status_now & 0x0020) {
  108. char suffix[11];
  109. /* get trackno */
  110. msu_track = get_msu_track();
  111. printf("Audio requested! Track=%d\n", msu_track);
  112. /* open file */
  113. f_close(&file_handle);
  114. snprintf(suffix, sizeof(suffix), "-%d.pcm", msu_track);
  115. strcpy((char*)file_buf, (char*)file_lfn);
  116. strcpy(strrchr((char*)file_buf, (int)'.'), suffix);
  117. printf("filename: %s\n", file_buf);
  118. f_open(&file_handle, (const TCHAR*)file_buf, FA_READ);
  119. f_lseek(&file_handle, 4L);
  120. f_read(&file_handle, &msu_loop_point, 4, &bytes_read);
  121. printf("loop point: %ld samples\n", msu_loop_point);
  122. ff_sd_offload=1;
  123. sd_offload_tgt=1;
  124. f_lseek(&file_handle, 8L);
  125. set_dac_addr(0);
  126. dac_pause();
  127. dac_reset();
  128. ff_sd_offload=1;
  129. sd_offload_tgt=1;
  130. f_read(&file_handle, file_buf, MSU_DAC_BUFSIZE, &bytes_read);
  131. /* clear busy bit */
  132. set_msu_status(0x00, 0x20); /* set no bits, reset bit 5 */
  133. }
  134. if(fpga_status_now & 0x0010) {
  135. /* get address */
  136. msu_offset=get_msu_offset();
  137. printf("Data requested! Offset=%08lx page1=%08lx page2=%08lx\n", msu_offset, msu_page1_start, msu_page2_start);
  138. if( ((msu_offset < msu_page1_start)
  139. || (msu_offset >= msu_page1_start + msu_page_size))
  140. && ((msu_offset < msu_page2_start)
  141. || (msu_offset >= msu_page2_start + msu_page_size))) {
  142. printf("offset %08lx out of range (%08lx-%08lx, %08lx-%08lx), reload\n", msu_offset, msu_page1_start,
  143. msu_page1_start+msu_page_size-1, msu_page2_start, msu_page2_start+msu_page_size-1);
  144. /* cache miss */
  145. /* fill buffer */
  146. set_msu_addr(0x0);
  147. sd_offload_tgt=2;
  148. ff_sd_offload=1;
  149. res = f_lseek(&msufile, msu_offset);
  150. DBG_MSU1 printf("seek to %08lx, res = %d\n", msu_offset, res);
  151. sd_offload_tgt=2;
  152. ff_sd_offload=1;
  153. res = f_read(&msufile, file_buf, 16384, &bytes_read2);
  154. DBG_MSU1 printf("read res = %d\n", res);
  155. DBG_MSU1 printf("read %d bytes\n", bytes_read2);
  156. msu_reset(0x0);
  157. msu_page1_start = msu_offset;
  158. msu_page2_start = msu_offset + msu_page_size;
  159. } else {
  160. if (msu_offset >= msu_page1_start && msu_offset <= msu_page1_start + msu_page_size) {
  161. msu_reset(0x0000 + msu_offset - msu_page1_start);
  162. DBG_MSU1 printf("inside page1, new offset: %08lx\n", 0x0000 + msu_offset-msu_page1_start);
  163. if(!(msu_page2_start == msu_page1_start + msu_page_size)) {
  164. set_msu_addr(0x2000);
  165. sd_offload_tgt=2;
  166. ff_sd_offload=1;
  167. f_read(&msufile, file_buf, 8192, &bytes_read2);
  168. DBG_MSU1 printf("next page dirty (was: %08lx), loaded page2 (start now: ", msu_page2_start);
  169. msu_page2_start = msu_page1_start + msu_page_size;
  170. DBG_MSU1 printf("%08lx)\n", msu_page2_start);
  171. }
  172. } else if (msu_offset >= msu_page2_start && msu_offset <= msu_page2_start + msu_page_size) {
  173. DBG_MSU1 printf("inside page2, new offset: %08lx\n", 0x2000 + msu_offset-msu_page2_start);
  174. msu_reset(0x2000 + msu_offset - msu_page2_start);
  175. if(!(msu_page1_start == msu_page2_start + msu_page_size)) {
  176. set_msu_addr(0x0);
  177. sd_offload_tgt=2;
  178. ff_sd_offload=1;
  179. f_read(&msufile, file_buf, 8192, &bytes_read2);
  180. DBG_MSU1 printf("next page dirty (was: %08lx), loaded page1 (start now: ", msu_page1_start);
  181. msu_page1_start = msu_page2_start + msu_page_size;
  182. DBG_MSU1 printf("%08lx)\n", msu_page1_start);
  183. }
  184. } else printf("!!!WATWATWAT!!!\n");
  185. }
  186. /* clear bank bit to mask bank reset artifact */
  187. fpga_status_now &= ~0x2000;
  188. fpga_status_prev &= ~0x2000;
  189. /* clear busy bit */
  190. set_msu_status(0x00, 0x10);
  191. }
  192. if(fpga_status_now & 0x0001) {
  193. if(fpga_status_now & 0x0004) {
  194. msu_repeat = 1;
  195. set_msu_status(0x04, 0x01); /* set bit 2, reset bit 0 */
  196. printf("Repeat set!\n");
  197. } else {
  198. msu_repeat = 0;
  199. set_msu_status(0x00, 0x05); /* set no bits, reset bit 0+2 */
  200. printf("Repeat clear!\n");
  201. }
  202. if(fpga_status_now & 0x0002) {
  203. printf("PLAY!\n");
  204. set_msu_status(0x02, 0x01); /* set bit 0, reset bit 1 */
  205. dac_play();
  206. } else {
  207. printf("PAUSE!\n");
  208. set_msu_status(0x00, 0x03); /* set no bits, reset bit 1+0 */
  209. dac_pause();
  210. }
  211. }
  212. fpga_status_prev = fpga_status_now;
  213. /* handle loop / end */
  214. if(bytes_read < MSU_DAC_BUFSIZE / 2) {
  215. ff_sd_offload=0;
  216. sd_offload=0;
  217. if(msu_repeat) {
  218. printf("loop\n");
  219. ff_sd_offload=1;
  220. sd_offload_tgt=1;
  221. f_lseek(&file_handle, 8L+msu_loop_point*4);
  222. ff_sd_offload=1;
  223. sd_offload_tgt=1;
  224. f_read(&file_handle, file_buf, (MSU_DAC_BUFSIZE / 2) - bytes_read, &bytes_read);
  225. } else {
  226. set_msu_status(0x00, 0x02); /* clear play bit */
  227. }
  228. bytes_read = MSU_DAC_BUFSIZE;
  229. }
  230. if(msu1_check_reset()) {
  231. f_close(&msufile);
  232. f_close(&file_handle);
  233. spi_set_speed(SSP_CLK_DIVISOR_FPGA_SLOW);
  234. return 1;
  235. }
  236. }
  237. }
  238. /* END OF MSU1 STUFF */