MicroPython Forum (Archive)

mczubel wrote: ↑

Thu Dec 19, 2019 7:01 pm

Wei Lin wrote: ↑

Wed Feb 06, 2019 10:01 pm

The error message means that the SPI communication failed. Sometimes it fails after h/w reset until s/w reset.
I have no oscilloscope hence not sure why it is so.

Hi
I have the same error after deepsleep wake up.
First time work perfect, but after wakeup reset this error appears.
thank

kodsi wrote: ↑

Mon Jan 10, 2022 7:32 pm

Hello,

I had the same problem with esp32 Heltec board, running micropython 1.17.
Fixed it by calling machine.SoftSPI instead of machine.SPI in the first argument of the SX127x class constructor(SPI is deprectated)

Code: Select all

device_spi = machine.SoftSPI(baudrate = 10000000,
        polarity = 0, phase = 0, bits = 8, firstbit = machine.SPI.MSB,
        sck = machine.Pin(device_config['sck'], machine.Pin.OUT, machine.Pin.PULL_DOWN),
        mosi = machine.Pin(device_config['mosi'],machine.Pin.OUT, machine.Pin.PULL_UP),
        miso = machine.Pin(device_config['miso'], machine.Pin.IN, machine.Pin.PULL_UP))

lora = SX127x(device_spi, pins=device_config, parameters=lora_parameters)

I hope this helps,
cheers

dawgshalmer wrote: ↑

Wed Jan 12, 2022 3:57 am

kodsi wrote: ↑

Mon Jan 10, 2022 7:32 pm

Hello,

I had the same problem with esp32 Heltec board, running micropython 1.17.
Fixed it by calling machine.SoftSPI instead of machine.SPI in the first argument of the SX127x class constructor(SPI is deprectated)

Code: Select all

device_spi = machine.SoftSPI(baudrate = 10000000,
        polarity = 0, phase = 0, bits = 8, firstbit = machine.SPI.MSB,
        sck = machine.Pin(device_config['sck'], machine.Pin.OUT, machine.Pin.PULL_DOWN),
        mosi = machine.Pin(device_config['mosi'],machine.Pin.OUT, machine.Pin.PULL_UP),
        miso = machine.Pin(device_config['miso'], machine.Pin.IN, machine.Pin.PULL_UP))

lora = SX127x(device_spi, pins=device_config, parameters=lora_parameters)

I hope this helps,
cheers

Could you share the device_config and lora_parameters objects that you passed into this to make this work? I have the same board and there is scant documentation for anything.

kodsi wrote: ↑

Wed Jan 12, 2022 8:51 am

dawgshalmer wrote: ↑

Wed Jan 12, 2022 3:57 am

kodsi wrote: ↑

Mon Jan 10, 2022 7:32 pm

Hello,

I had the same problem with esp32 Heltec board, running micropython 1.17.
Fixed it by calling machine.SoftSPI instead of machine.SPI in the first argument of the SX127x class constructor(SPI is deprectated)

Code: Select all

device_spi = machine.SoftSPI(baudrate = 10000000,
        polarity = 0, phase = 0, bits = 8, firstbit = machine.SPI.MSB,
        sck = machine.Pin(device_config['sck'], machine.Pin.OUT, machine.Pin.PULL_DOWN),
        mosi = machine.Pin(device_config['mosi'],machine.Pin.OUT, machine.Pin.PULL_UP),
        miso = machine.Pin(device_config['miso'], machine.Pin.IN, machine.Pin.PULL_UP))

lora = SX127x(device_spi, pins=device_config, parameters=lora_parameters)

I hope this helps,
cheers

Could you share the device_config and lora_parameters objects that you passed into this to make this work? I have the same board and there is scant documentation for anything.

lora_parameters = {
'address': 1,
'frequency': 868E6,
'tx_power_level': 2,
'signal_bandwidth': 125E3,
'spreading_factor': 8,
'coding_rate': 5,
'preamble_length': 8,
'implicit_header': False,
'sync_word': 0x12,
'enable_CRC': False,
'invert_IQ': False,
}