Toit SPI Device Syntax Problem

[dummbold]

Hardware Setup (ESP32-C3):

MISO: GPIO5
MOSI: GPIO6
CLK: GPIO10
CS: GPIO4

Sensor: MAX31865 (PT1000 temperature sensor)

Attempted SPI Syntax Variations:

1. First Attempt:

cs_pin := gpio.Pin 4 --output
sensor := bus.device cs_pin --frequency=1_000_000

Error:

• Argument mismatch for 'Bus.device'

2. After Documentation Search:

sensor := bus.device --cs=gpio.Pin 4 --frequency=1_000_000
Errors:

• Too few unnamed arguments for 'Pin'
• Method does not take any unnamed arguments for 'Bus.device'

Found Documentation:

Official Toit Docs:
Show bus.device --cs=gpio.Pin 15 --frequency=10_000_000
But: Compiler doesn't accept this syntax!

Needed: Correct syntax for bus.device with CS pin and frequency parameters!

[floitsch]

You almost had it.
It's bus.device --cs=(gpio.Pin 15) --frequency=10_000_000
Or, if you put it on separate lines:

bus.device
    --cs=gpio.Pin 15
    --frequency=10_000_000

When an argument is on a separate line, then it doesn't need the parentheses.

The bus.device --cs=gpio.Pin 15 --frequency=10_000_000 was interpreted as:

bus.device
    --cs=gpio.Pin  // Error: pin needs an argument.
    15             // Error: device doesn't take any unnamed argument.
    --frequency=10_000_000

Basically, the compiler couldn't know that the 15 was for the gpio.Pin and not for the bus.device.

Minor note: for simplicity the documentation allocates the pin directly and doesn't hold on to it. This means that there is no way to close it at a later point. It would be cleaner to

cs := gpio.Pin 15
device := bus.device --cs=cs --frequency=10_000_000
try:
  ...
finally:
  device.close
  cs.close

I wouldn't start with this, though.

[dummbold]

Hello Florian - it's me the guy from the Maker Fair in Hanover ;-)
Thanks - I will let my Coder know.

The

jag flash

command knows a couple of statements such as:

jag flash --chip nnnnnn

But there is no 8266 or 8285 – is it not possible to flash these ESPs with toit?

[floitsch]

At the moment, Toit only runs on the esp32, esp32c3, esp32c6, esp32s2 and esp32s3.
The 8266 is also a bit light on resources, so not a prime target.