Add turbo sync mode

lib/SCSI2SD/CHANGELOG

@@ -1,5 +1,13 @@
-20170429		6.1.1
-	- Add new "turbo" speed mode to get faster async transfers.
+201705XX		6.1.1
+	- Add new "turbo" speed option to boost speeds.
+		- May not be reliable, and use is not supported.
+		- Async timings trimmed
+		- Sync speeds boosted to theoretical 15.625MB/s, with 12.0MB/s measured
+		read througput.
+		- SD card put in "high speed" mode.
+		- USB for configuration/firmware updates is disabled in turbo mode when
+		processing SCSI commands. A power cycle may be required to connect
+		via USB to reset the 48MHz clock back to 48MHz.
 	- Fix scsi2sd-util6 size and sector-size inputs
 	- Fix crash when configured scsi disk starting sector is less than
 	SD card size

lib/SCSI2SD/STM32CubeMX/SCSI2SD-V6/Src/fsmc.c

@@ -67,12 +67,12 @@ void MX_FSMC_Init(void)
   hsram1.Init.WriteBurst = FSMC_WRITE_BURST_DISABLE;
   /* Timing */
 
-  // 1 clock to read the address, + 3 for the synchroniser
-  Timing.AddressSetupTime = 4;
+  // 1 clock to read the address, + 1 for synchroniser skew
+  Timing.AddressSetupTime = 2;
   Timing.AddressHoldTime = 1;
 
-  // 3 for synchroniser, 1 to skip hold time, 1 to process read, 1 to output
-  Timing.DataSetupTime = 6;
+  // 1 for synchroniser skew, 1 to skip hold time, 1 to process read, 1 to output
+  Timing.DataSetupTime = 5;//4 doesn't work ? ?? ?
 
   // Allow a clock for us to release signals, plus 3 for the synchroniser to
   // realise the cycle has ended. Need to avoid both devices acting as outputs
@@ -126,11 +126,14 @@ static void HAL_FSMC_MspInit(void){
   PE0   ------> FSMC_NBL0
   PE1   ------> FSMC_NBL1
   */
+  // MM: GPIO_SPEED_FREQ_MEDIUM is rated up to 50MHz, which is fine as all the
+  // fsmc timings are > 1 (ie. so clock speed / 2 is around 50MHz).
+
   /* GPIO_InitStruct */
   GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
   GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
   GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM; //HIGH;
   GPIO_InitStruct.Alternate = GPIO_AF12_FSMC;
 
   HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
@@ -140,7 +143,7 @@ static void HAL_FSMC_MspInit(void){
                           |GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10;
   GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
   GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM; //HIGH;
   GPIO_InitStruct.Alternate = GPIO_AF12_FSMC;
 
   HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
@@ -149,7 +152,7 @@ static void HAL_FSMC_MspInit(void){
   GPIO_InitStruct.Pin = GPIO_PIN_7;
   GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
   GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;//HIGH;
   GPIO_InitStruct.Alternate = GPIO_AF12_FSMC;
 
   HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

lib/SCSI2SD/src/firmware/config.c

@@ -193,7 +193,8 @@ scsiDevInfoCommand()
 		sdDev.capacity >> 24,
 		sdDev.capacity >> 16,
 		sdDev.capacity >> 8,
-		sdDev.capacity
+		sdDev.capacity,
+		1 // useSdConfig, always true for V6.
 	};
 	hidPacket_send(response, sizeof(response));
 }

lib/SCSI2SD/src/firmware/main.c

@@ -117,11 +117,11 @@ void mainLoop()
 			// run if the SD card is present at startup.
 			// Don't use VBUS monitoring because that just tells us about
 			// power, which could be from a charger
-#if 0
 			if ((blockDev.state & DISK_PRESENT) &&
 				isUsbStarted &&
 				(scsiDev.cmdCount > 0) && // no need for speed without scsi
-				!USBD_Composite_IsConfigured(&hUsbDeviceFS))
+				!USBD_Composite_IsConfigured(&hUsbDeviceFS) &&
+				(scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_TURBO))
 			{
 				if (HAL_SD_HighSpeed(&hsd) == SD_OK)
 				{
@@ -130,7 +130,6 @@ void mainLoop()
 					isUsbStarted = 0;
 				}
 			}
-#endif
 
 			else if (!(blockDev.state & DISK_PRESENT) && !isUsbStarted)
 			{

lib/SCSI2SD/src/firmware/scsi.c

@@ -807,14 +807,17 @@ static void process_MessageOut()
 				// FAST20 / 50ns / 20MHz is disabled for now due to
 				// data corruption while reading data. We can count the
 				// ACK's correctly, but can't save the data to a register
-				// before it changes.
-				// TODO work out the fastest sync period that will work
-				/*
-				if (transferPeriod <= 12)
+				// before it changes. (ie. transferPeriod == 12)
+				if ((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_TURBO) &&
+					(transferPeriod <= 16))
 				{
-					scsiDev.target->syncPeriod = 12; // 50ns, 20MB/s
+					scsiDev.target->syncPeriod = 16; // 15.6MB/s
 				}
-				else */if (transferPeriod <= 25 &&
+				else if (scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_TURBO)
+				{
+					scsiDev.target->syncPeriod = transferPeriod;
+				}
+				else if (transferPeriod <= 25 &&
 					((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_NoLimit) ||
 						(scsiDev.boardCfg.scsiSpeed >= S2S_CFG_SPEED_SYNC_10)))
 				{

lib/SCSI2SD/src/firmware/scsiPhy.c

@@ -60,6 +60,12 @@ static uint8_t asyncTimings[][4] =
 #define SCSI_FAST10_HOLD 3 // 33ns
 #define SCSI_FAST10_ASSERT 3 // 30ns
 
+// Fastest possible timing, probably not 20MB/s
+#define SCSI_FAST20_DESKEW 1
+#define SCSI_FAST20_HOLD 2
+#define SCSI_FAST20_ASSERT 2
+
+
 #define syncDeskew(period) ((period) < 45 ? \
 	SCSI_FAST10_DESKEW : SCSI_FAST5_DESKEW)
 
@@ -493,8 +499,11 @@ void scsiEnterPhase(int phase)
 		if ((newPhase == DATA_IN || newPhase == DATA_OUT) &&
 			scsiDev.target->syncOffset)
 		{
-			
-			if (scsiDev.target->syncPeriod <= 25)
+			if (scsiDev.target->syncPeriod < 23)
+			{
+				scsiSetTiming(SCSI_FAST20_ASSERT, SCSI_FAST20_DESKEW, SCSI_FAST20_HOLD, 1);
+			}
+			else if (scsiDev.target->syncPeriod <= 25)
 			{
 				scsiSetTiming(SCSI_FAST10_ASSERT, SCSI_FAST10_DESKEW, SCSI_FAST10_HOLD, 1);
 			}
@@ -539,7 +548,7 @@ void scsiEnterPhase(int phase)
 			} else if (scsiDev.boardCfg.scsiSpeed >= S2S_CFG_SPEED_ASYNC_33) {
 
 				asyncTiming = asyncTimings[SCSI_ASYNC_33];
-	
+
 			} else {
 				asyncTiming = asyncTimings[SCSI_ASYNC_15];
 			}