added OneWire function (not working yet); added calculation for pulse configuration

548e07d3 · Jan Pospisil · 811d92b0 · 548e07d3
Commit 548e07d3 authored Aug 16, 2016 by Jan Pospisil
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Showing with 114 additions and 10 deletions

FFPG_driver.py sw/FFPG_driver.py +114 -10

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--- a/sw/FFPG_driver.py
+++ b/sw/FFPG_driver.py
@@ -21,7 +21,7 @@ class ConColors:
 m = encoreio.Module.get_instance('fmc_fpg', 0)

 WB_DEBUG = True
-WB_DEBUG_2_SV = True
+WB_DEBUG_2_SV = False
 WB_DEBUG_2_SV_FILE = 'wb_trace.svh'

 ###################################################################
@@ -370,6 +370,79 @@ def Debug():
    PrintBits(debug, 0, 2, "CH1 FSM state", ("Stop", "WaitForTrigger", "Generating", "Outputting"))
    PrintBits(debug, 3, 5, "CH2 FSM state", ("Stop", "WaitForTrigger", "Generating", "Outputting"))
    
+###################################################################
+## OneWire stuff
+###################################################################
+
+OW_CMD_ROM_SEARCH = 0xF0
+OW_CMD_ROM_READ = 0x33
+OW_CMD_ROM_MATCH = 0x55
+OW_CMD_ROM_SKIP = 0xCC
+OW_CMD_ALARM_SEARCH = 0xEC
+OW_CMD_CONVERT_T = 0x44
+OW_CMD_WRITE_SCRATCHPAD = 0x4E
+OW_CMD_READ_SCRATCHPAD = 0xBE
+OW_CMD_COPY_SCRATCHPAD = 0x48
+OW_CMD_RECALL_E_2 = 0xB8
+OW_CMD_READ_POWER_SUPPLY = 0xB4
+
+# overdrive: 0 - normal mode / 1 - overdrive mode
+
+def OneWireReset(overdrive = 0):
+    print 'OW: reset'
+    WbWrite('onewire_ctrl_sta', 0x08 | (overdrive << 2) | 0x02)
+    reg = WbRead('onewire_ctrl_sta')
+    while (0x08 & reg):
+        reg = WbRead('onewire_ctrl_sta')
+    reg &= 0x01
+    print 'OW: presence = '+str(reg)
+    return reg
+
+def OneWireSlot(bit, overdrive = 0):
+    WbWrite('onewire_ctrl_sta', 0x08 | (overdrive << 2) | bit)
+    reg = WbRead('onewire_ctrl_sta')
+    while (0x08 & reg):
+        reg = WbRead('onewire_ctrl_sta')
+    return reg & 0x01
+
+def OneWireReadBit(overdrive = 0):
+    result = OneWireSlot(overdrive, 1)
+    print 'OW: read bit = '+str(result)
+    return result
+
+def OneWireWriteBit(bit, overdrive = 0):
+    print 'OW: write bit('+str(bit)+')'
+    OneWireSlot(overdrive, bit)
+
+def OneWireRead(overdrive = 0):
+    result = 0;
+    for i in range(8):
+        result |= OneWireReadBit(overdrive)
+        result <<= 1
+    print 'OW: read = '+hex(result)
+    return result
+
+def OneWireWrite(byte, overdrive = 0):
+    print 'OW: write('+hex(byte)+')'
+    for i in range(8):
+        OneWireWriteBit(byte & 1, overdrive)
+        byte >>= 1
+
+def OneWireReadRom(overdrive = 0):
+    presence = OneWireReset(overdrive)
+    if presence == 0:
+        print 'OW Thermometer is not present!'
+        return
+    OneWireWrite(OW_CMD_ROM_READ, overdrive)
+    print hex(OneWireRead())
+    print hex(OneWireRead())
+    print hex(OneWireRead())
+    print hex(OneWireRead())
+    print hex(OneWireRead())
+    print hex(OneWireRead())
+    print hex(OneWireRead())
+    print hex(OneWireRead())
+
 ###################################################################
 ## Test functions
 ###################################################################
@@ -383,10 +456,25 @@ def Init(memoryPart = -1):
    SetVcxoFrequency(-0.2105) # 125.0000 MHz
    ClearMemory(0, '*', memoryPart)

+# time 't' is in [ns] - same as other times
+# output: (bit, delay)
+#   bit - position of the bit to set
+#   delay - delay parameter to be set
+def CalculateParams(t):
+    rfPeriod = 4.99
+    delayOffset = 3.739
+    
+    bit = int(t/rfPeriod) # bit position
+    rest = t - bit * rfPeriod # in ns
+    rest += delayOffset
+    delay = int(round(rest * 100)) # delay IC value
+    
+    return (bit, delay)
+    
 def TestPulse(channel = 1, overflow = 17820):
    # configure channel
    WbWrite('overflow', overflow)
-    WbWrite('trig_latency', 8)
+    WbWrite('trig_latency', 11)

    # start = 5
    # length = 20
@@ -407,25 +495,40 @@ def TestPulse(channel = 1, overflow = 17820):
    # CreatePulse(channel, 13, 23)
    # CreatePulse(channel, 14, 24)

-    CreatePulse(channel, 5, 10)
-    CreatePulse(channel, 20, 50)
-    CreatePulse(channel, 100, 300)
+    # CreatePulse(channel, 5, 10)
+    # CreatePulse(channel, 20, 50)
+    # CreatePulse(channel, 100, 300)
+    
+    # all times in ns
+    
+    pulseDelay = 4.87
+    pulseWidth = 12.3
+    
+    (setBit, setDelay) = CalculateParams(pulseDelay)
+    (resBit, resDelay) = CalculateParams(pulseDelay + pulseWidth)
+
+    CreatePulse(channel, setBit, resBit)

-    WbWrite('ch'+str(channel)+'_delay_set', 100)
-    WbWrite('ch'+str(channel)+'_delay_res', 500)
+    WbWrite('ch'+str(channel)+'_delay_set', setDelay)
+    WbWrite('ch'+str(channel)+'_delay_res', resDelay+18)
    
    Enable(channel)
-    StartOnce(channel)
+    Start(channel)

-Init(15)
+# Init(15)
+Init()
 Control()
 Status()
-TestPulse(1, 400)
+# TestPulse(1, 600)
+TestPulse(1)
 # TestPulse(2)
 Control()
 Status()
 Debug()

+
+# OneWireReadRom(1) # does not work :/
+
 ###################################################################
 ## debug ending
 ###################################################################
@@ -434,3 +537,4 @@ if WB_DEBUG_2_SV:
    WB_DEBUG_2_SV_FP.write('\n')
    WB_DEBUG_2_SV_FP.write('$display("Error count: %0d\\n", errors);\n')
    WB_DEBUG_2_SV_FP.close()
+    WB_DEBUG_2_SV = False
\ No newline at end of file