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spi_software: Implementation of software spi

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Signed-off-by: Matt Janus <FragginRight@variabl.es>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-02-09 12:22:10 -05:00
parent 090cd930d9
commit 98ed462865
6 changed files with 200 additions and 20 deletions
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53
klippy/extras/bus.py
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@ -12,22 +12,33 @@ import mcu
# Helper code for working with devices connected to an MCU via an SPI bus
class MCU_SPI:
def __init__(self, mcu, bus, pin, mode, speed, shutdown_seq):
def __init__(self, mcu, bus, pin, mode, speed, shutdown_seq, sw_pins=None):
self.mcu = mcu
shutdown_msg = "".join(["%02x" % (x,) for x in shutdown_seq])
self.oid = self.mcu.create_oid()
if pin is None:
self.config_msg = (
"config_spi_without_cs oid=%d bus=%d mode=%d rate=%d"
" shutdown_msg=%s" % (
self.oid, bus, mode, speed, shutdown_msg))
else:
if pin is not None:
# Set all CS pins high before first config_spi
self.mcu.add_config_cmd("set_digital_out pin=%s value=1" % (pin,))
self.config_msg = (
if sw_pins is not None:
software_spi_oid = self.mcu.create_oid()
self.config_msgs = [
"config_software_spi oid=%d sclk_pin=%s mosi_pin=%s miso_pin=%s"
" mode=%d rate=%d" % (
software_spi_oid, sw_pins[0], sw_pins[1], sw_pins[2],
mode, speed),
"config_spi_from_software oid=%d sw_oid=%d pin=%s"
" shutdown_msg=%s" % (
self.oid, software_spi_oid, pin, shutdown_msg)]
elif pin is None:
self.config_msgs = [
"config_spi_without_cs oid=%d bus=%d mode=%d rate=%d"
" shutdown_msg=%s" % (
self.oid, bus, mode, speed, shutdown_msg)]
else:
self.config_msgs = [
"config_spi oid=%d bus=%d pin=%s mode=%d rate=%d"
" shutdown_msg=%s" % (
self.oid, bus, pin, mode, speed, shutdown_msg))
self.oid, bus, pin, mode, speed, shutdown_msg)]
self.cmd_queue = self.mcu.alloc_command_queue()
self.mcu.register_config_callback(self.build_config)
self.spi_send_cmd = self.spi_transfer_cmd = None
@ -38,7 +49,8 @@ class MCU_SPI:
def get_command_queue(self):
return self.cmd_queue
def build_config(self):
self.mcu.add_config_cmd(self.config_msg)
for msg in self.config_msgs:
self.mcu.add_config_cmd(msg)
self.spi_send_cmd = self.mcu.lookup_command(
"spi_send oid=%c data=%*s", cq=self.cmd_queue)
self.spi_transfer_cmd = self.mcu.lookup_command(
@ -68,11 +80,24 @@ def MCU_SPI_from_config(config, mode, pin_option="cs_pin",
ppins.reset_pin_sharing(cs_pin_params)
pin = None
# Load bus parameters
speed = config.getint('spi_speed', default_speed, minval=100000)
bus = config.getint('spi_bus', 0, minval=0)
# Create MCU_SPI object
mcu = cs_pin_params['chip']
return MCU_SPI(mcu, bus, pin, mode, speed, shutdown_seq)
speed = config.getint('spi_speed', default_speed, minval=100000)
if config.get('spi_software_sclk_pin', None) is not None:
sw_pin_names = ['spi_software_%s_pin' % (name,)
for name in ['sclk', 'mosi', 'miso']]
sw_pin_params = [ppins.lookup_pin(config.get(name), share_type=name)
for name in sw_pin_names]
for pin_params in sw_pin_params:
if pin_params['chip'] != mcu:
raise ppins.error("%s: spi pins must be on same mcu" % (
config.get_name(),))
sw_pins = tuple([pin_params['pin'] for pin_params in sw_pin_params])
bus = None
else:
bus = config.getint('spi_bus', 0, minval=0)
sw_pins = None
# Create MCU_SPI object
return MCU_SPI(mcu, bus, pin, mode, speed, shutdown_seq, sw_pins)
######################################################################