AP_Scripting: added ANX CAN battery driver

libraries/AP_Scripting/drivers/BattMon_ANX.lua

@@ -0,0 +1,253 @@
+--[[ 
+ device driver for ANX CAN battery monitor
+--]]
+
+local MAV_SEVERITY = {EMERGENCY=0, ALERT=1, CRITICAL=2, ERROR=3, WARNING=4, NOTICE=5, INFO=6, DEBUG=7}
+
+local PARAM_TABLE_KEY = 45
+local PARAM_TABLE_PREFIX = "BATT_ANX_"
+
+-- add a parameter and bind it to a variable
+function bind_add_param(name, idx, default_value)
+    assert(param:add_param(PARAM_TABLE_KEY, idx, name, default_value), string.format('could not add param %s', name))
+    return Parameter(PARAM_TABLE_PREFIX .. name)
+end
+
+-- Type conversion functions, little endian
+function get_uint16(frame, ofs)
+    return frame:data(ofs) + (frame:data(ofs + 1) << 8)
+end
+
+-- Setup EFI Parameters
+assert(param:add_table(PARAM_TABLE_KEY, PARAM_TABLE_PREFIX, 15), 'could not add param table')
+
+--[[
+  // @Param: BATT_ANX_ENABLE
+  // @DisplayName: Enable ANX battery support
+  // @Description: Enable ANX battery support
+  // @Values: 0:Disabled,1:Enabled
+  // @User: Standard
+--]]
+local BATT_ANX_ENABLE = bind_add_param('ENABLE', 1, 0)
+
+--[[
+  // @Param: BATT_ANX_CANDRV
+  // @DisplayName: Set ANX CAN driver
+  // @Description: Set ANX CAN driver
+  // @Values: 0:None,1:1stCANDriver,2:2ndCanDriver
+  // @User: Standard
+--]]
+local BATT_ANX_CANDRV     = bind_add_param('CANDRV',     2, 1)
+
+--[[
+  // @Param: BATT_ANX_INDEX
+  // @DisplayName: ANX CAN battery index
+  // @Description: ANX CAN battery index
+  // @Range: 1 10
+  // @User: Standard
+--]]
+local BATT_ANX_INDEX     = bind_add_param('INDEX',     3, 1)
+
+--[[
+  // @Param: BATT_ANX_OPTIONS
+  // @DisplayName: ANX CAN battery options
+  // @Description: ANX CAN battery options
+  // @Bitmask: 0:LogAllFrames
+  // @User: Advanced
+--]]
+local BATT_ANX_OPTIONS   = bind_add_param('OPTIONS',    4, 0)
+
+local OPTION_LOGALLFRAMES = 0x01
+
+if BATT_ANX_ENABLE:get() == 0 then
+   gcs:send_text(0, string.format("BATT_ANX: disabled"))
+   return
+end
+
+-- Register for the CAN drivers
+local driver
+
+local CAN_BUF_LEN = 25
+if BATT_ANX_CANDRV:get() == 1 then
+   driver = CAN.get_device(CAN_BUF_LEN)
+elseif BATT_ANX_CANDRV:get() == 2 then
+   driver = CAN.get_device2(CAN_BUF_LEN)
+end
+
+if not driver then
+    gcs:send_text(0, string.format("BATT_ANX: Failed to load driver"))
+    return
+end
+
+local assembly = {}
+assembly.num_frames = 0
+assembly.frames = {}
+
+--[[
+   xmodem CRC implementation thanks to https://github.com/cloudwu/skynet
+   under MIT license
+--]]
+local XMODEMCRC16Lookup = {
+   0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
+   0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
+   0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
+   0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
+   0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
+   0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
+   0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
+   0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
+   0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
+   0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
+   0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
+   0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
+   0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
+   0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
+   0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
+   0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
+   0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
+   0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
+   0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
+   0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
+   0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
+   0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
+   0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
+   0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
+   0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
+   0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
+   0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
+   0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
+   0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
+   0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
+   0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
+   0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
+}
+
+local function crc_ANX(bytes)
+   -- ANX CRC uses xmodem with a seed of 0xa635
+   local crc = 0xa635
+	for i=1,#bytes do
+		local b = string.byte(bytes,i,i)
+		crc = ((crc<<8) & 0xffff) ~ XMODEMCRC16Lookup[(((crc>>8)~b) & 0xff) + 1]
+	end
+    return crc
+end
+
+local frame_count = 0
+
+local function log_can_frame(frame)
+   logger.write("CANF",'Id,DLC,FC,B0,B1,B2,B3,B4,B5,B6,B7','IBIBBBBBBBB',
+                frame:id(),
+                frame:dlc(),
+                frame_count,
+                frame:data(0), frame:data(1), frame:data(2), frame:data(3),
+                frame:data(4), frame:data(5), frame:data(6), frame:data(7))
+   frame_count = frame_count + 1
+end
+
+
+local function parse_volt_frame(payload)
+   if #payload < 12 then
+      -- invalid length
+      return
+   end
+   local total_volt, current, rem_cap, temperature, _ = string.unpack("<HhHhH", string.sub(payload, 1, 10))
+   total_volt = total_volt * 0.01
+   -- it is a discharge, so use minus current
+   current = -current * 0.01
+   rem_cap = rem_cap * 0.1
+   temperature = temperature * 0.1
+   local num_cells = (#payload - 10) / 2
+   local cells = {}
+   for i = 1, num_cells do
+      cells[i] = string.unpack("<H", string.sub(payload, 11+(i-1)*2, 11+i*2))
+      cells[i] = cells[i]
+   end
+   -- API allows for up to 32 cells, but battery backend is more limited
+   if num_cells > 32 then
+      num_cells = 32
+   end
+
+   local state = BattMonitorScript_State()
+   state:healthy(true)
+   state:voltage(total_volt)
+   state:cell_count(num_cells)
+   state:capacity_remaining_pct(math.floor(rem_cap))
+   for i = 1, num_cells do
+      state:cell_voltages(i-1, cells[i])
+   end
+   state:current_amps(current)
+   state:temperature(temperature)
+
+   battery:handle_scripting(BATT_ANX_INDEX:get()-1, state)
+end
+
+
+--[[
+   process a set of frames for a whole packet
+--]]
+local function process_frames(msg_type_id)
+   local bytes = ""
+   for i = 1, assembly.num_frames do
+      local dlc = assembly.frames[i]:dlc()
+      for ofs = 1, dlc do
+         bytes = bytes .. string.char(assembly.frames[i]:data(ofs-1))
+      end
+   end
+   local crc = string.unpack("<H", string.sub(bytes, 1, 2))
+   local payload = string.sub(bytes, 3, #bytes)
+   if crc ~= crc_ANX(payload) then
+      return
+   end
+   -- message types with cell voltages are from 721 to 727
+   if msg_type_id >= 721 and msg_type_id <= 727 then
+      parse_volt_frame(payload)
+   end
+end
+
+--[[
+   read from CAN bus, updating battery backend
+--]]
+local function read_can()
+   while true do
+      local frame = driver:read_frame()
+      if not frame then
+         return
+      end
+      if BATT_ANX_OPTIONS:get() & OPTION_LOGALLFRAMES ~= 0 then
+         log_can_frame(frame)
+      end
+      if not frame:isExtended() then
+         -- only want extended frames
+         break
+      end
+      local id = frame:id_signed()
+      -- local sender_id = id&0x7
+      local last_pkt_id = (id>>3) & 1
+      local pkt_count = (id>>4) & 0x3F
+      -- local pkt_id = (id>>10) & 0x7f
+      -- local trans_type = (id>>17) & 0x03
+      local msg_type_id = (id>>19) & 0x3FF
+
+      if pkt_count ~= assembly.num_frames then
+         -- reset, non-contiguous packets
+         assembly.num_frames = 0
+      end
+
+      assembly.num_frames = assembly.num_frames + 1
+      assembly.frames[assembly.num_frames] = frame
+      if last_pkt_id == 1 then
+         process_frames(msg_type_id)
+         -- reset for next frame
+         assembly.num_frames = 0
+      end
+   end
+end
+
+function update()
+   read_can()
+   return update,10
+end
+
+gcs:send_text(MAV_SEVERITY.INFO, "BATT_ANX: Started")
+
+return update()

libraries/AP_Scripting/drivers/BattMon_ANX.md

@@ -0,0 +1,20 @@
+# ANX Battery Driver
+
+This driver implements support for the ANX CAN battery protocol
+
+# Parameters
+
+The script used the following parameters:
+
+## BATT_ANX_ENABLE
+
+this must be set to 1 to enable the driver
+
+## BATT_ANX_CANDRV
+
+This sets the scripting CAN driver to use, this should be 1 or 2.
+
+## BATT_ANX_INDEX
+
+This sets the battery monitor index to use. Set to 1 for BATT1, 2 for
+BATT2 etc