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examples: move SPI examples to spi.py

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occheung 2022-06-16 16:00:22 +08:00
parent 9920661516
commit c1c078671b
3 changed files with 53 additions and 51 deletions
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8
2245.tex
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@ -621,13 +621,13 @@ The following examples will assume the SPI communication has the following prope
\item Full duplex
\end{itemize}
The base line configuration for an \texttt{SPIMaster} instance can be defined as such:
\inputcolorboxminted[0]{firstline=105,lastline=110}{examples/ttl.py}
\inputcolorboxminted[0]{firstline=2,lastline=8}{examples/spi.py}
The \texttt{SPI\char`_END} \& \texttt{SPI\char`_INPUT} flags will be modified during runtime in the following example.
\subsubsection{SPI frequency}
Frequency of the SPI clock must be the result of RTIO clock frequency divided by an integer factor from [2, 257].
In the folowing examples, the SPI frequency will be set to 1 MHz by dividing the RTIO frequency (125 MHz) by 125.
\inputcolorboxminted[0]{firstline=112,lastline=112}{examples/ttl.py}
\inputcolorboxminted[0]{firstline=10,lastline=10}{examples/spi.py}
\subsubsection{SPI write}
Typically, an SPI write operation involves sending an instruction and data to the SPI slaves.
@ -654,7 +654,7 @@ The timing diagram of such write operation is shown in the following.
\newpage
Suppose the instruction is \texttt{0x13}, while the data is \texttt{0xDEADBEEF}. In addition, both slave 1 \& 2 are selected. This SPI transcation can be performed by the following code.
\inputcolorboxminted{firstline=119,lastline=128}{examples/ttl.py}
\inputcolorboxminted{firstline=18,lastline=27}{examples/spi.py}
\subsubsection{SPI read}
A 32-bits read is represented by the following timing diagram.
@ -679,7 +679,7 @@ A 32-bits read is represented by the following timing diagram.
\end{center}
Suppose the instruction is \texttt{0x81}, where only slave 0 is selected. This SPI transcation can be performed by the following code.
\inputcolorboxminted{firstline=136,lastline=150}{examples/ttl.py}
\inputcolorboxminted{firstline=35,lastline=49}{examples/spi.py}
\newpage
\section{Ordering Information}

49
examples/spi.py Normal file
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@ -0,0 +1,49 @@
from artiq.experiment import *
from artiq.coredevice import spi2 as spi
SPI_CONFIG = (0 * spi.SPI_OFFLINE | 0 * spi.SPI_END |
0 * spi.SPI_INPUT | 0 * spi.SPI_CS_POLARITY |
0 * spi.SPI_CLK_POLARITY | 0 * spi.SPI_CLK_PHASE |
0 * spi.SPI_LSB_FIRST | 0 * spi.SPI_HALF_DUPLEX)
CLK_DIV = 125
class SPIWrite(EnvExperiment):
def build(self):
self.setattr_device("core")
self.spi = self.get_device("dio_spi0")
@kernel
def run(self):
self.core.reset()
self.spi.set_config_mu(SPI_CONFIG, 8, CLK_DIV, 0b110)
self.spi.write(0x13 << 24) # Shift the bits to the MSBs.
# Since SPI_LSB_FIRST is NOT set,
# SPI Machine will shift out bits from
# the MSB of the `data` register.`
self.spi.set_config_mu(SPI_CONFIG | spi.SPI_END, 32, CLK_DIV, 0b110)
self.spi.write(0xDEADBEEF)
class SPIRead(EnvExperiment):
def build(self):
self.setattr_device("core")
self.spi = self.get_device("dio_spi0")
@kernel
def run(self):
self.core.reset()
self.spi.set_config_mu(SPI_CONFIG, 8, CLK_DIV, 0b001)
self.spi.write(0x81 << 24) # Shift the bits to the MSBs.
# Since SPI_LSB_FIRST is NOT set,
# SPI Machine will shift out bits from
# the MSB of the `data` register.`
self.spi.set_config_mu(SPI_CONFIG | spi.SPI_END | spi.SPI_INPUT,
32, CLK_DIV, 0b001)
self.spi.write(0) # write() performs the SPI transfer.
# As suggested by the timing diagram,
# the exact value of this argument
# does not matter.
print(self.spi.read())

47
examples/ttl.py
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@ -101,50 +101,3 @@ class ClockGen(EnvExperiment):
def run(self):
self.core.reset()
self.ttl0.set(62.5*MHz)
from artiq.coredevice import spi2 as spi
SPI_CONFIG = (0 * spi.SPI_OFFLINE | 0 * spi.SPI_END |
0 * spi.SPI_INPUT | 0 * spi.SPI_CS_POLARITY |
0 * spi.SPI_CLK_POLARITY | 0 * spi.SPI_CLK_PHASE |
0 * spi.SPI_LSB_FIRST | 0 * spi.SPI_HALF_DUPLEX)
CLK_DIV = 125
class SPIWrite(EnvExperiment):
def build(self):
self.setattr_device("core")
self.spi = self.get_device("dio_spi0")
@kernel
def run(self):
self.core.reset()
self.spi.set_config_mu(SPI_CONFIG, 8, CLK_DIV, 0b110)
self.spi.write(0x13 << 24) # Shift the bits to the MSBs.
# Since SPI_LSB_FIRST is NOT set,
# SPI Machine will shift out bits from
# the MSB of the `data` register.`
self.spi.set_config_mu(SPI_CONFIG | spi.SPI_END, 32, CLK_DIV, 0b110)
self.spi.write(0xDEADBEEF)
class SPIRead(EnvExperiment):
def build(self):
self.setattr_device("core")
self.spi = self.get_device("dio_spi0")
@kernel
def run(self):
self.core.reset()
self.spi.set_config_mu(SPI_CONFIG, 8, CLK_DIV, 0b001)
self.spi.write(0x81 << 24) # Shift the bits to the MSBs.
# Since SPI_LSB_FIRST is NOT set,
# SPI Machine will shift out bits from
# the MSB of the `data` register.`
self.spi.set_config_mu(SPI_CONFIG | spi.SPI_END | spi.SPI_INPUT,
32, CLK_DIV, 0b001)
self.spi.write(0) # write() performs the SPI transfer.
# As suggested by the timing diagram,
# the exact value of this argument
# does not matter.
print(self.spi.read())