diff options
Diffstat (limited to 'sds011.lua')
| -rw-r--r-- | sds011.lua | 31 |
1 files changed, 23 insertions, 8 deletions
@@ -55,23 +55,38 @@ end function sds011.set_work_period(period) -- period == 0 : continuous operation, about one measurement per second -- period > 0 : about one measurement every <period> minutes, fan is turned off in-between - if period < 0 or period > 30 then + if period ~= nil and (period < 0 or period > 30) then return end - sds011.work_period = period - local cmd = string.char(c_head, c_id, c_workperiod, c_write, period) + local op = c_write + if period == nil then + op = c_read + period = 0 + end + local cmd = string.char(c_head, c_id, c_workperiod, op, period) cmd = cmd .. string.char(0, 0, 0, 0, 0, 0, 0, 0, 0, 0) return sds011.finish_cmd(cmd) end function sds011.parse_frame(data) local header, command, pm25l, pm25h, pm10l, pm10h, id1, id2, sum, tail = struct.unpack("BBBBBBBBBB", data) - if header ~= c_head or command ~= 0xc0 or (pm25l + pm25h + pm10l + pm10h + id1 + id2) % 256 ~= sum or tail ~= c_tail then - return nil + if header ~= c_head or (pm25l + pm25h + pm10l + pm10h + id1 + id2) % 256 ~= sum or tail ~= c_tail then + return false + end + if command == 0xc0 then + local pm25 = pm25h * 256 + pm25l + local pm10 = pm10h * 256 + pm10l + sds011.pm2_5i = pm25 / 10 + sds011.pm2_5f = pm25 % 10 + sds011.pm10i = pm10 / 10 + sds011.pm10f = pm10 % 10 + return true + end + if command == 0xc5 then + sds011.work_period = pm10l + return true end - pm25 = pm25h * 256 + pm25l - pm10 = pm10h * 256 + pm10l - return pm25 / 10, pm25 % 10, pm10 / 10, pm10 % 10 + return false end return sds011 |