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Commit 37bef031 authored by Gijs Schoonderbeek's avatar Gijs Schoonderbeek
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Added fan control on CCD

parent b33fb937
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......@@ -16,6 +16,7 @@ Set CCD
'''
import sys
import time
import math
sys.path.insert(0,'.')
import os
if os.name =="posix":
......@@ -32,7 +33,7 @@ READ_ALL = False
CHECK_EEPROM = True
PWR_RST = False
READ_SENSOR = False
READ_SET_FAN = True
CLK_FREQ = '200MHz'
dev_i2c_eeprom = I2C(0x50)
dev_i2c_eeprom.bus_nr = I2CBUSNR
......@@ -251,39 +252,57 @@ def read_temp():
else:
print("Error reading tempeature")
def set_fan_off():
#
# Switch CCD fan off
#
print("Switch fan off")
MAX6620 = 0x29
fanmonitor_dev = I2C(MAX6620)
fanmonitor_dev.bus_nr = 3
fanmonitor_dev.write_bytes(0x00, 0x10)
fanmonitor_dev.write_bytes(0x02, 0x08)
fanmonitor_dev.write_bytes(0x28, 0x00)
fanmonitor_dev.write_bytes(0x29, 0x00)
def set_fan_speed(speed):
#
# Set control voltage of fan PNP
#
stri = "Set fan to {} %".format(speed)
print(stri)
MAX6620 = 0x29
reg_a = ((0xFF*speed)/100) & 0xFF
fanmonitor_dev = I2C(MAX6620)
fanmonitor_dev.bus_nr = 3
fanmonitor_dev.write_bytes(0x00, 0x00)
fanmonitor_dev.write_bytes(0x02, 0x08)
fanmonitor_dev.write_bytes(0x01, 0x0F)
fanmonitor_dev.write_bytes(0x06, 0x60)
fanmonitor_dev.write_bytes(0x28, reg_a)
fanmonitor_dev.write_bytes(0x29, 0x80)
def read_tacho():
MAX6620 = 0x52
REG_GLOBAL = 0x00
#
# Read the fan speed
#
MAX6620 = 0x29
REG_TACH_MSP_REGS = [ 0x10, 0x12, 0x14]
REG_TACH_LSP_REGS = [ 0x11, 0x13, 0x15]
TACH_PERIODS = 16
TACH_COUNT_FREQ = 8192
FAN_TACHS = 1
RUN_MONITOR = 0x02
NOF_APS_FANS = 3
DEBUG=1
fanmonitor_dev = I2C(MAX6620)
fanmonitor_dev.bus_nr = I2CBUSNR
fanmonitor_dev.bus_nr = 3
fan_nr=0
ret_ack, ret_value = fanmonitor_dev.read_bytes(1)
if ret_ack < 1:
stri = " Device {0} at address 0x{1:X} not found".format("MAX6620", MAX6620)
print(stri)
status = False
else:
if DEBUG:
stri = "Device {0} at address 0x{1:X} is found ".format("MAX6620", MAX6620)
print(stri)
ret_ack, reg_before = fanmonitor_dev.read_bytes(REG_GLOBAL, 1)
fanmonitor_dev.write_bytes(REG_GLOBAL, RUN_MONITOR)
ret_ack, reg_after = fanmonitor_dev.read_bytes(REG_GLOBAL, 1)
if DEBUG:
stri = "Reg at address 0x{0} before : {1} and after write action {2}".format(REG_GLOBAL, reg_before, reg_after)
print(stri)
fan_config_reg = int((math.log(TACH_PERIODS) / math.log(2))) << 5
for fan_cnt in range(NOF_APS_FANS):
fanmonitor_dev.write_bytes(0x02 + fan_cnt, 0x88)
fanmonitor_dev.write_bytes(0x06 + fan_cnt, fan_config_reg)
ret_ack, tach_msb = fanmonitor_dev.read_bytes(REG_TACH_MSP_REGS[fan_nr], 1)
ret_ack, tach_msb = fanmonitor_dev.read_bytes(REG_TACH_MSP_REGS[0], 1)
tach_msb = int(tach_msb, 16) & 0xFF
if tach_msb > 254:
if DEBUG :
......@@ -291,12 +310,12 @@ def read_tacho():
tach = 99999
rpm = 0
else:
ret_ack, tach_lsb = fanmonitor_dev.read_bytes(REG_TACH_LSP_REGS[fan_nr], 1)
ret_ack, tach_lsb = fanmonitor_dev.read_bytes(REG_TACH_LSP_REGS[0], 1)
tach_lsb = int(tach_lsb, 16) & 0xE0
tach = tach_msb*16 + tach_lsb/8
rpm = float((TACH_COUNT_FREQ*TACH_PERIODS*60))/(FAN_TACHS*tach)
if DEBUG:
stri = "MSP: {0}, LSB: {1}, TACH : {2}".format(tach_msb, tach_lsb, tach)
stri = "MSP: {0}, LSB: {1}, TACH : {2}, RPM : {3:6.2f}".format(tach_msb, tach_lsb, tach, rpm)
print(stri)
if CHECK_EEPROM :
......@@ -319,7 +338,12 @@ if READ_LOCK:
print("Not Locked --> No 10 MHz ref")
else:
print("Not locked --> PLL Error")
if READ_SET_FAN :
read_tacho()
set_fan_off()
sleep(10)
set_fan_speed(75)
sleep(10)
read_tacho()
if READ_SENSOR:
......
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