def send_scpi_command(command, Aardvark_in_use, dec_addr):
"""
Function to send a SCPI command to the slave device
@param[in] command: the command to send (string)
@param[in] Aardvark_in_use: The Aaardvark to use to read the data
(aardvark_py.aardvark)
@param[in] dec_addr: the decimal address to write to (int)
"""
# convert the data into a list of bytes and append the terminator
write_data = list(command)
write_data = [ord(item) for item in write_data]
write_data.append(0x0a)
# convert to an array to be compiant with the aardvark
data = array('B', write_data)
# Write the data to the slave device
aardvark_py.aa_i2c_write(Aardvark_in_use, dec_addr,
aardvark_py.AA_I2C_NO_FLAGS, data)
# print what was done
if 'TEL?' in command:
# there is data to follow
print 'Read:\t\t' + command
else:
# there is not
print 'Write:\t\t' + command
def send_raw_command(command, Aardvark_in_use):
"""
Function to send a <RAW> command to a slave device.
@param[in] command: The command to send (string).
@param[in] Aardvark_in_use: The Aaardvark to use to send the command
(aardvark_py.aardvark)
"""
# determine if it is a valid raw command
if pySCPI_config.is_valid_raw(command):
# it is so extract the data to write
write_data = command[:-1].split(' ')
# extract the address to write to
raw_addr = int(write_data[1][:-1],16)
# convert all of the data specified in the string to integers
int_write_data = [int(item,16) for \
item in write_data[2:]]
# add the terminator
int_write_data.append(0x0a)
# convert the data to an array to be compatible with the aardvark
data = array('B', int_write_data)
# Write the data to the slave device
aardvark_py.aa_i2c_write(Aardvark_in_use, raw_addr,
aardvark_py.AA_I2C_NO_FLAGS,
data)
# write output
print 'Raw Write:\t\t[' + \
' '.join([str(item) for item in write_data[2:]]) + \
'] to address ' + write_data[1][:-1]
def read_register(self, sensor, register, length=1):
sad = self._sensortable[sensor]
# todo check write status first
aa.aa_i2c_write(self._handle, sad, aa.AA_I2C_NO_STOP,
array('B', [register])) # write address
(count, data_in) = aa.aa_i2c_read(self._handle, sad,
aa.AA_I2C_NO_FLAGS,
length) # read data
if count != length:
raise BusException(
'No response from I2C slave at address 0x%x for sensor %s' %
(sad, sensor))
return data_in
def PMBus_Group_Write(ADM1266_Address, write_data):
a = array('B')
for i in write_data:
a.append(i)
for x in range(len(ADM1266_Address)):
device_address = ADM1266_Address[x]
if (x < len(ADM1266_Address)):
num = aardvark_py.aa_i2c_write(Aardvark_Handle, device_address,
aardvark_py.AA_I2C_NO_STOP, a)
else:
num = aardvark_py.aa_i2c_write(Aardvark_Handle, device_address,
aardvark_py.AA_I2C_NO_FLAGS, a)
if num != len(write_data):
raise Exception(
'Failed to write i2c device @{0:02X}.'.format(device_address))
def PMBus_Write(device_address, write_data, stop=True):
a = array('B')
for i in write_data:
a.append(i)
num = aardvark_py.aa_i2c_write(Aardvark_Handle, device_address,
aardvark_py.AA_I2C_NO_FLAGS, a)
if num != len(write_data):
raise Exception(
'Failed to write i2c device @{0:02X}.'.format(device_address))
def write(self, addr, data):
"""Writes an array of bytes to the addressed I2C device.
Keyword arguments:
addr -- I2C Slave Address (0x00 - 0x7F)
data -- Bytes to send
"""
if type(data) is not array:
data = array('B', data)
result = api.aa_i2c_write(self._handle, addr, api.AA_I2C_NO_FLAGS, data)
return _check_result(result)
def write(self, addr, data):
"""Writes an array of bytes to the addressed I2C device.
Keyword arguments:
addr -- I2C Slave Address (0x00 - 0x7F)
data -- Bytes to send
"""
if type(data) is not array:
data = array('B', data)
result = api.aa_i2c_write(self._handle, addr, api.AA_I2C_NO_FLAGS,
data)
return _check_result(result)
def write(handle, data_out):
"""This function sends a command to the SHA204 device."""
log_write(data_out)
res = aa_i2c_write(handle, I2C_ADDRESS, AA_I2C_NO_FLAGS, data_out)
if (res < 0):
print "error: %s" % (aa_status_string(res))
return res
if (res == 0):
print "error: slave device %02X not found" % (I2C_ADDRESS)
return res
def hw_i2c_write_no_stop(self, data_out):
myException = Exception()
with self.activityLock :
if self.handle == None :
myException.message = "hw_i2c_write_no_stop failure: attempting to write to null handle\n"
raise myException
# Call the appropriate I2C hardware interface to write data
# (write with start condition but no stop condition)
if self.HW_INTERFACE == config.AARDVARK:
aardvark_py.aa_i2c_write(self.handle, self.DEVICE_I2C_ADDR, aardvark_py.AA_I2C_NO_STOP, data_out)
elif self.HW_INTERFACE == config.FTDI:
flags = ftdi.I2C_TRANSFER_OPTIONS_START_BIT
ftdi.ftdi_i2c_write (self.handle, self.DEVICE_I2C_ADDR, flags, data_out)
elif self.HW_INTERFACE == config.USB_TO_ANY:
myException.message = 'USB_TO_ANY hardware interface hw_interface_init not implemented\n'
raise myException
else:
myException.message = 'Invalid hardware interface selected in config.py\n'
raise myException
def read(self, address, offset, length):
res = None
while (not res):
#zero byte write to set the read pointer
aa_py.aa_i2c_write(self.aa,
address,
aa_py.AA_I2C_NO_FLAGS,
array('B', [offset & 0xff])
)
(count, res) = aa_py.aa_i2c_read(self.aa, address, aa_py.AA_I2C_NO_FLAGS, length)
if (count < 0):
print "error: %s" % aa_py.aa_status_string(count)
res = None
elif (count == 0):
print "error: no bytes read"
print " are you sure you have the right slave address?"
res = -999999999
elif (count != length):
print "error: read %d bytes (expected %d)" % (count, length)
res = -999999999
return res
def send_SCPI(self, command, address):
"""
Function to send a SCPI command to the slave device
@param[in] command: the command to send (string)
@param[in] address: the decimal address to write to (int)
"""
# convert the data into a list of bytes and append the terminator
write_data = list(command)
write_data = [ord(item) for item in write_data]
write_data.append(0x0a)
# convert to an array to be compiant with the aardvark
data = array('B', write_data)
# Write the data to the slave device
aardvark_py.aa_i2c_write(self.port, int(address, 16),
aardvark_py.AA_I2C_NO_FLAGS, data)
# pause
aardvark_py.aa_sleep_ms(100)
def write_register(self, sensor, register, data):
if isinstance(data, int):
length = 2
data_out = array('B', [register, data])
elif isinstance(data, list) or isinstance(data, tuple):
data = list(data)
length = 1 + len(data)
data_out = array('B', [register] + data)
elif data is None:
# special case : one byte write
length = 1
data_out = array('B', [register])
else:
raise BusException('Datatype "%s" not supported.' % type(data))
sad = self._sensortable[sensor]
res = aa.aa_i2c_write(self._handle, sad, aa.AA_I2C_NO_FLAGS, data_out)
if res != length:
raise BusException(
'Unable write to I2C slave at address 0x%x for sensor %s' %
(sad, sensor))
