firmware: query reset button in timer ISR

src/sdnative.c

@@ -12,6 +12,7 @@
 #include "fileops.h"
 #include "bits.h"
 #include "fpga_spi.h"
+#include "memory.h"
 
 #define MAX_CARDS 1
 
@@ -112,6 +113,7 @@ uint8_t cmd[6]={0,0,0,0,0,0};
 uint8_t rsp[17];
 uint8_t csd[17];
 uint8_t cid[17];
+diskinfo0_t di;
 uint8_t ccs=0;
 uint32_t rca;
 
@@ -929,6 +931,7 @@ DRESULT sdn_initialize(BYTE drv) {
 
   /* record CSD for getinfo */
   cmd_slow(SEND_CSD, rca, 0, NULL, csd);
+  sdn_getinfo(drv, 0, &di);
 
   /* record CID */
   cmd_slow(SEND_CID, rca, 0, NULL, cid);
@@ -1057,3 +1060,55 @@ void sdn_changed() {
   }
 }
 
+/* measure sd access time */
+void sdn_gettacc(uint32_t *tacc_max, uint32_t *tacc_avg) {
+  uint32_t sec1 = 0;
+  uint32_t sec2 = 0;
+  uint32_t time, time_max = 0;
+  uint32_t time_avg = 0LL;
+  uint32_t numread = 16384;
+  int i;
+  int sec_step = di.sectorcount / numread - 1;
+  if(disk_state == DISK_REMOVED) return;
+  sdn_checkinit(0);
+  for (i=0; i < 128; i++) {
+    sd_offload_tgt=2;
+    sd_offload=1;
+    sdn_read(0, NULL, 0, 1);
+    sd_offload_tgt=2;
+    sd_offload=1;
+    sdn_read(0, NULL, i*sec_step, 1);
+  }
+  for (i=0; i < numread && sram_readbyte(SRAM_CMD_ADDR) != 0x00 && disk_state != DISK_REMOVED; i++) {
+  /* reset timer */
+    LPC_RIT->RICTRL = 0;
+    sd_offload_tgt=2;
+    sd_offload=1;
+    sdn_read(0, NULL, sec1, 2);
+    sec1 += 2;
+  /* start timer */
+    LPC_RIT->RICOUNTER = 0;
+    LPC_RIT->RICTRL = BV(RITEN);
+    sd_offload_tgt=2;
+    sd_offload=1;
+    sdn_read(0, NULL, sec2, 1);
+  /* read timer */
+    time = LPC_RIT->RICOUNTER;
+/*    sd_offload_tgt=2;
+    sd_offload=1;
+    sdn_read(0, NULL, sec2, 15);*/
+    time_avg += time/16;
+    if(time > time_max) {
+      time_max = time;
+    }
+    sec2 += sec_step;
+  }
+  time_avg = time_avg / (i+1) * 16;
+  sd_offload=0;
+  LPC_RIT->RICTRL = 0;
+  if(disk_state != DISK_REMOVED) {
+    *tacc_max = time_max/(CONFIG_CPU_FREQUENCY / 1000000)-114;
+    *tacc_avg = time_avg/(CONFIG_CPU_FREQUENCY / 1000000)-114;
+  }
+}
+

src/sdnative.h

@@ -25,6 +25,6 @@ DRESULT sdn_getinfo(BYTE drv, BYTE page, void *buffer);
 
 void    sdn_changed(void);
 uint8_t* sdn_getcid(void);
-
+void    sdn_gettacc(uint32_t *tacc_max, uint32_t *tacc_avg);
 #endif
 

src/snes.c

@@ -44,6 +44,7 @@ uint32_t saveram_crc, saveram_crc_old;
 extern snes_romprops_t romprops;
 
 volatile int reset_changed;
+volatile int reset_pressed;
 
 void prepare_reset() {
   snes_reset(1);

src/timer.c

@@ -17,6 +17,8 @@
 
 extern volatile int sd_changed;
 extern volatile int reset_changed;
+extern volatile int reset_pressed;
+
 volatile tick_t ticks;
 volatile int wokefromrit;
 
@@ -35,6 +37,7 @@ void SysTick_Handler(void) {
   }
   reset_state = (reset_state << 1) | get_snes_reset() | 0xe000;
   if((reset_state == 0xf000) || (reset_state == 0xefff)) {
+    reset_pressed = (reset_state == 0xf000);
     reset_changed = 1;
   }
   sdn_changed();