from litedram.phy.dfi import Interface as DFIInterface
from litex.soc.cores.spi import SPIMaster
from litex.soc.cores.pwm import PWM
-from litex.soc.cores.bitbang import I2CMaster
+#from litex.soc.cores.bitbang import I2CMaster
from litex.soc.cores import uart
from litex.tools.litex_sim import sdram_module_nphases, get_sdram_phy_settings
# GPIO Tristate -------------------------------------------------------
# doesn't work properly.
#from litex.soc.cores.gpio import GPIOTristate
-from litex.soc.interconnect.csr import CSRStorage, CSRStatus
+from litex.soc.interconnect.csr import CSRStorage, CSRStatus, CSRField
from migen.genlib.cdc import MultiReg
# Imports
from litex.build.io import SDROutput, SDRInput
+# I2C Master Bit-Banging --------------------------------------------------
+
+class I2CMaster(Module, AutoCSR):
+ """I2C Master Bit-Banging
+
+ Provides the minimal hardware to do software I2C Master bit banging.
+
+ On the same write CSRStorage (_w), software can control SCL (I2C_SCL),
+ SDA direction and value (I2C_OE, I2C_W). Software get back SDA value
+ with the read CSRStatus (_r).
+ """
+ pads_layout = [("scl", 1), ("sda", 1)]
+ def __init__(self, pads):
+ self.pads = pads
+ self._w = CSRStorage(fields=[
+ CSRField("scl", size=1, offset=0),
+ CSRField("oe", size=1, offset=1),
+ CSRField("sda", size=1, offset=2)],
+ name="w")
+ self._r = CSRStatus(fields=[
+ CSRField("sda", size=1, offset=0)],
+ name="r")
+
+ self.connect(pads)
+
+ def connect(self, pads):
+ _sda_w = Signal()
+ _sda_oe = Signal()
+ _sda_r = Signal()
+ self.comb += [
+ pads.scl.eq(self._w.fields.scl),
+ pads.sda_oe.eq( self._w.fields.oe),
+ pads.sda_o.eq( self._w.fields.sda),
+ self._r.fields.sda.eq(pads.sda_i),
+ ]
+
+
class GPIOTristateASIC(Module, AutoCSR):
def __init__(self, pads):
nbits = len(pads.oe) # hack
self.submodules.dq = SDRPad(pads, "dq", d.wrdata, d.wrdata_en, d.rddata)
if hasattr(pads, "dm"):
- # optimisation by yosys, fudge it... sigh
- dm = Signal(len(pads.dm))
for i in range(len(pads.dm)):
- self.comb += dm[i].eq(1)
- self.sync += pads.dm[i].eq(dm[i]) # FIXME
+ self.specials += SDROutput(i=d.wrdata_mask[i], o=pads.dm[i])
# DQ/DM Control Path ----------------------------------------------
rddata_en = Signal(cl + cmd_latency)
self.submodules.crg = CRG(platform.request("sys_clk"),
platform.request("sys_rst"))
+ # PLL/Clock Select
+ clksel_i = platform.request("sys_clksel_i")
+ pll48_o = platform.request("sys_pll_48_o")
+
+ self.comb += self.cpu.clk_sel.eq(clksel_i) # allow clock src select
+ self.comb += pll48_o.eq(self.cpu.pll_48_o) # "test feed" from the PLL
+
#ram_init = []
# SDRAM ----------------------------------------------------
self.submodules.uart = ResetInserter()(uart.UART(self.uart_phy,
tx_fifo_depth = 16,
rx_fifo_depth = 16))
- # "real" pads connect to C4M JTAG iopad
- uart_pads = platform.request(uart_name) # "real" (actual) pin
- uart_io_pads = self.cpu.iopads['uart'] # C4M JTAG pads
- self.comb += uart_pads.tx.eq(uart_io_pads.tx)
- self.comb += uart_io_pads.rx.eq(uart_pads.rx)
self.csr.add("uart_phy", use_loc_if_exists=True)
self.csr.add("uart", use_loc_if_exists=True)
self.submodules.gpio = GPIOTristateASIC(gpio_core_pads)
self.add_csr("gpio")
- gpio_pads = platform.request("gpio") # "real" (actual) pins
- gpio_io_pads = self.cpu.iopads['gpio'] # C4M JTAG pads
- self.comb += gpio_io_pads.i.eq(gpio_pads.i)
- self.comb += gpio_pads.o.eq(gpio_io_pads.o)
- self.comb += gpio_pads.oe.eq(gpio_io_pads.oe)
-
# SPI Master
self.submodules.spi_master = SPIMaster(
pads = platform.request("spi_master"),
setattr(self.submodules, name, PWM(platform.request("pwm", i)))
self.add_csr(name)
- if False: # TODO: convert to _i _o _oe
- # I2C Master
- self.submodules.i2c = I2CMaster(platform.request("i2c"))
- self.add_csr("i2c")
+ # I2C Master
+ self.submodules.i2c = I2CMaster(platform.request("i2c"))
+ self.add_csr("i2c")
# SDCard -----------------------------------------------------
projects / soc.git / blobdiff