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Forum Index : Microcontroller and PC projects : SPI communication

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Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 2185
Posted: 07:28am 25 Jan 2022
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It looks to me as if this is only a small part of the code, lizby. I suspect there's a library or two loaded before we get anywhere near this bit.
Mick

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Preliminary MMBasic docs
 
lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1574
Posted: 08:01am 25 Jan 2022
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  Mixtel90 said  It looks to me as if this is only a small part of the code, lizby. I suspect there's a library or two loaded before we get anywhere near this bit.


It is

I didnt want to put too much in the post other than the main bit, thats whay I left the link to where the code came from before the actual code I posted

"""
`adafruit_esp32spi`
================================================================================
CircuitPython driver library for using ESP32 as WiFi  co-processor using SPI
* Author(s): ladyada
Implementation Notes
--------------------
**Hardware:**
**Software and Dependencies:**
* Adafruit CircuitPython firmware for the supported boards:
 https://github.com/adafruit/circuitpython/releases
* Adafruit's Bus Device library:
 https://github.com/adafruit/Adafruit_CircuitPython_BusDevice
"""

import struct
import time
from micropython import const
from digitalio import Direction
from adafruit_bus_device.spi_device import SPIDevice

__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_ESP32SPI.git"

_SET_NET_CMD = const(0x10)
_SET_PASSPHRASE_CMD = const(0x11)
_SET_AP_NET_CMD = const(0x18)
_SET_AP_PASSPHRASE_CMD = const(0x19)
_SET_DEBUG_CMD = const(0x1A)

_GET_CONN_STATUS_CMD = const(0x20)
_GET_IPADDR_CMD = const(0x21)
_GET_MACADDR_CMD = const(0x22)
_GET_CURR_SSID_CMD = const(0x23)
_GET_CURR_BSSID_CMD = const(0x24)
_GET_CURR_RSSI_CMD = const(0x25)
_GET_CURR_ENCT_CMD = const(0x26)

_SCAN_NETWORKS = const(0x27)
_START_SERVER_TCP_CMD = const(0x28)
_GET_SOCKET_CMD = const(0x3F)
_GET_STATE_TCP_CMD = const(0x29)
_DATA_SENT_TCP_CMD = const(0x2A)
_AVAIL_DATA_TCP_CMD = const(0x2B)
_GET_DATA_TCP_CMD = const(0x2C)
_START_CLIENT_TCP_CMD = const(0x2D)
_STOP_CLIENT_TCP_CMD = const(0x2E)
_GET_CLIENT_STATE_TCP_CMD = const(0x2F)
_DISCONNECT_CMD = const(0x30)
_GET_IDX_RSSI_CMD = const(0x32)
_GET_IDX_ENCT_CMD = const(0x33)
_REQ_HOST_BY_NAME_CMD = const(0x34)
_GET_HOST_BY_NAME_CMD = const(0x35)
_START_SCAN_NETWORKS = const(0x36)
_GET_FW_VERSION_CMD = const(0x37)
_SEND_UDP_DATA_CMD = const(0x39)
_GET_TIME = const(0x3B)
_GET_IDX_BSSID_CMD = const(0x3C)
_GET_IDX_CHAN_CMD = const(0x3D)
_PING_CMD = const(0x3E)

_SEND_DATA_TCP_CMD = const(0x44)
_GET_DATABUF_TCP_CMD = const(0x45)
_INSERT_DATABUF_TCP_CMD = const(0x46)
_SET_ENT_IDENT_CMD = const(0x4A)
_SET_ENT_UNAME_CMD = const(0x4B)
_SET_ENT_PASSWD_CMD = const(0x4C)
_SET_ENT_ENABLE_CMD = const(0x4F)
_SET_CLI_CERT = const(0x40)
_SET_PK = const(0x41)

_SET_PIN_MODE_CMD = const(0x50)
_SET_DIGITAL_WRITE_CMD = const(0x51)
_SET_ANALOG_WRITE_CMD = const(0x52)
_SET_DIGITAL_READ_CMD = const(0x53)
_SET_ANALOG_READ_CMD = const(0x54)

_START_CMD = const(0xE0)
_END_CMD = const(0xEE)
_ERR_CMD = const(0xEF)
_REPLY_FLAG = const(1 << 7)
_CMD_FLAG = const(0)

SOCKET_CLOSED = const(0)
SOCKET_LISTEN = const(1)
SOCKET_SYN_SENT = const(2)
SOCKET_SYN_RCVD = const(3)
SOCKET_ESTABLISHED = const(4)
SOCKET_FIN_WAIT_1 = const(5)
SOCKET_FIN_WAIT_2 = const(6)
SOCKET_CLOSE_WAIT = const(7)
SOCKET_CLOSING = const(8)
SOCKET_LAST_ACK = const(9)
SOCKET_TIME_WAIT = const(10)

WL_NO_SHIELD = const(0xFF)
WL_NO_MODULE = const(0xFF)
WL_IDLE_STATUS = const(0)
WL_NO_SSID_AVAIL = const(1)
WL_SCAN_COMPLETED = const(2)
WL_CONNECTED = const(3)
WL_CONNECT_FAILED = const(4)
WL_CONNECTION_LOST = const(5)
WL_DISCONNECTED = const(6)
WL_AP_LISTENING = const(7)
WL_AP_CONNECTED = const(8)
WL_AP_FAILED = const(9)

ADC_ATTEN_DB_0 = const(0)
ADC_ATTEN_DB_2_5 = const(1)
ADC_ATTEN_DB_6 = const(2)
ADC_ATTEN_DB_11 = const(3)
 
JohnS
Guru

Joined: 18/11/2011
Location: United Kingdom
Posts: 2765
Posted: 08:52am 25 Jan 2022
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Which states can change to which others I wonder.

John
 
lizby
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Joined: 17/05/2016
Location: United States
Posts: 1997
Posted: 01:53pm 25 Jan 2022
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So the fact that these constants are numbers (as I suspected) indicates that the firmware won't respond to "AT+GMR", but instead will interpret a number, 0x27, _SCAN_NETWORKS, as "Master wants a response the same as would come from a module with AT firmware responding to 'AT+GMR'".

Whether this firmware also orders that information in some way or just sends exactly what you would get with an ESP-01 and "AT+GMR" is unclear. In any case, unless the device first tells the master how many bytes it will send (in response to a query from the master), it will be up to the SPI master to clock out NULLs until it figures out that the response is complete. It may be hundreds or thousands of bytes.

~
Edited 2022-01-25 23:54 by lizby
 
lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1574
Posted: 05:16pm 25 Jan 2022
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I won't post on this subject again
but this is the python code to connect to an access point and list what wifi devices it sees
import usocket
from machine import Pin, I2C, ADC, UART, SPI, PWM
from time import sleep

N1 = network.WLAN_SPI(network.STA_IF)
N1.active(True)

print("API list:")
dir(N1)

print("wifi list:")
lis = N1.scan()
for q in lis:
print(q)

N1.connect("access point","password")
if N1.isconnected():
print(" ip gateway netmask MAC ssid")
print(N1.ifconfig())
 
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