Commit 4a6c637caa2abb5ed0c13bbb0ac7e95ca0047d73
2014-03-02T14:21:10
Add bitmode init to bxm open sequence.
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diff --git a/driver-bitfury.c b/driver-bitfury.c
index 6b74390..0933ada 100644
--- a/driver-bitfury.c
+++ b/driver-bitfury.c
@@ -23,6 +23,57 @@ int opt_nf1_bits = 50;
#define BF1MSGSIZE 7
#define BF1INFOSIZE 14
+#define TWELVE_MHZ 12000000
+
+//Low port pins
+#define SK 1
+#define DO 2
+#define DI 4
+#define CS 8
+#define GPIO0 16
+#define GPIO1 32
+#define GPIO2 64
+#define GPIO3 128
+
+//GPIO pins
+#define GPIOL0 0
+#define GPIOL1 1
+#define GPIOL2 2
+#define GPIOL3 3
+#define GPIOH 4
+#define GPIOH1 5
+#define GPIOH2 6
+#define GPIOH3 7
+#define GPIOH4 8
+#define GPIOH5 9
+#define GPIOH6 10
+#define GPIOH7 11
+
+#define DEFAULT_DIR (SK | DO | CS | GPIO0 | GPIO1 | GPIO2 | GPIO3) /* Setup default input or output state per FTDI for SPI */
+#define DEFAULT_STATE (CS) /* CS idles high, CLK idles LOW for SPI0 */
+
+//MPSSE commands from FTDI AN_108
+#define INVALID_COMMAND 0xAB
+#define ENABLE_ADAPTIVE_CLOCK 0x96
+#define DISABLE_ADAPTIVE_CLOCK 0x97
+#define ENABLE_3_PHASE_CLOCK 0x8C
+#define DISABLE_3_PHASE_CLOCK 0x8D
+#define TCK_X5 0x8A
+#define TCK_D5 0x8B
+#define CLOCK_N_CYCLES 0x8E
+#define CLOCK_N8_CYCLES 0x8F
+#define PULSE_CLOCK_IO_HIGH 0x94
+#define PULSE_CLOCK_IO_LOW 0x95
+#define CLOCK_N8_CYCLES_IO_HIGH 0x9C
+#define CLOCK_N8_CYCLES_IO_LOW 0x9D
+#define TRISTATE_IO 0x9E
+#define TCK_DIVISOR 0x86
+#define LOOPBACK_END 0x85
+#define SET_OUT_ADBUS 0x80
+#define SET_OUT_ACBUS 0x82
+#define WRITE_BYTES_SPI0 0x11
+#define READ_WRITE_BYTES_SPI0 0x31
+
static void bf1_empty_buffer(struct cgpu_info *bitfury)
{
char buf[512];
@@ -446,10 +497,26 @@ static void bxm_empty_buffer(struct cgpu_info *bitfury)
} while (amount);
}
+/* Calculate required divisor for desired frequency see FTDI AN_108 page 19*/
+static uint16_t calc_divisor(uint32_t system_clock, uint32_t freq)
+{
+ uint16_t divisor = system_clock / freq;
+
+ divisor /= 2;
+ divisor -= 1;
+ return divisor;
+}
+
static bool bxm_open(struct cgpu_info *bitfury, struct bitfury_info *info)
{
+ unsigned char mode = BITMODE_RESET;
+ unsigned char bitmask = 0;
+ unsigned short usb_val = bitmask;
+ uint32_t system_clock = TWELVE_MHZ;
+ uint32_t freq = 200000;
+ uint16_t divisor = calc_divisor(system_clock,freq);
+ int amount, err;
char buf[4];
- int err;
bxm_empty_buffer(bitfury);
/* Device likes being reset first. */
@@ -464,6 +531,57 @@ static bool bxm_open(struct cgpu_info *bitfury, struct bitfury_info *info)
if (err)
return false;
+ //Do a BITMODE_RESET
+ usb_val |= (mode << 8);
+ err = usb_transfer(bitfury, FTDI_TYPE_OUT, SIO_SET_BITMODE_REQUEST, usb_val, 1, C_BXM_SETBITMODE);
+ if (err)
+ return false;
+ //Now set to MPSSE mode
+ bitmask = 0;
+ mode = BITMODE_MPSSE;
+ usb_val = bitmask;
+ usb_val |= (mode << 8);
+ err = usb_transfer(bitfury, FTDI_TYPE_OUT, SIO_SET_BITMODE_REQUEST, usb_val, 1, C_BXM_SETBITMODE);
+ if (err)
+ return false;
+
+ //Now set the clock divisor
+ //First send just the 0x8B command to set the system clock to 12MHz
+ memset(buf, 0, 4);
+ buf[0] = TCK_D5;
+ err = usb_write(bitfury, buf, 1, &amount, C_BXM_CLOCK);
+ if (err || amount != 1)
+ return false;
+
+ buf[0] = TCK_DIVISOR;
+ buf[1] = (divisor & 0xFF);
+ buf[2] = ((divisor >> 8) & 0xFF);
+ err = usb_write(bitfury, buf, 3, &amount, C_BXM_CLOCKDIV);
+ if (err || amount != 3)
+ return false;
+
+ //Disable internal loopback
+ buf[0] = LOOPBACK_END;
+ err = usb_write(bitfury, buf, 1, &amount, C_BXM_LOOP);
+ if (err || amount != 1)
+ return false;
+
+ //Now set direction and idle (initial) states for the pins
+ buf[0] = SET_OUT_ADBUS;
+ buf[1] = DEFAULT_STATE; //Bitmask for LOW_PORT
+ buf[2] = DEFAULT_DIR;
+ err = usb_write(bitfury, buf, 3, &amount, C_BXM_ADBUS);
+ if (err || amount != 3)
+ return false;
+
+ //Set the pin states for the HIGH_BITS port as all outputs, all low
+ buf[0] = SET_OUT_ACBUS;
+ buf[1] = 0x00; //Bitmask for HIGH_PORT
+ buf[2] = 0xFF;
+ err = usb_write(bitfury, buf, 3, &amount, C_BXM_ACBUS);
+ if (err || amount != 3)
+ return false;
+
return true;
}
diff --git a/usbutils.h b/usbutils.h
index fa97d90..a5fdf16 100644
--- a/usbutils.h
+++ b/usbutils.h
@@ -375,6 +375,12 @@ struct cg_usb_info {
USB_ADD_COMMAND(C_BXM_RESET, "BXMReset") \
USB_ADD_COMMAND(C_BXM_SETLATENCY, "BXMSetLatency") \
USB_ADD_COMMAND(C_BXM_SECR, "BXMSetEventCharRequest") \
+ USB_ADD_COMMAND(C_BXM_SETBITMODE, "BXMSetBitmodeRequest") \
+ USB_ADD_COMMAND(C_BXM_CLOCK, "BXMClock") \
+ USB_ADD_COMMAND(C_BXM_CLOCKDIV, "BXMClockDiv") \
+ USB_ADD_COMMAND(C_BXM_LOOP, "BXMLoop") \
+ USB_ADD_COMMAND(C_BXM_ADBUS, "BXMADBus") \
+ USB_ADD_COMMAND(C_BXM_ACBUS, "BXMACBus") \
USB_ADD_COMMAND(C_HF_RESET, "HFReset") \
USB_ADD_COMMAND(C_HF_PLL_CONFIG, "HFPLLConfig") \
USB_ADD_COMMAND(C_HF_ADDRESS, "HFAddress") \