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--- nyan:lora_dev_boards [2024/02/01 09:15] – river
+++ nyan:lora_dev_boards [2024/06/20 03:01] (current) – river
@@ Line 41: / Line 41: @@
 This was straightforward to flash with Meshtastic.
+The WiFi is terrible. Probably because of the small helical coil antenna. It seems to need an AP very close to connect.
+  * ESP32-S3
+  * CP2102
+==== Connections ====
+=== USB ===
+The ESP has native USB, but it is not connected on this board. The USB connector goes to the CP2102. The USB pins on the ESP are broken out to the headers though, so it could be added.
+=== LoRa ===
+^ ESP32 Pin ^ LoRa Chip Signal ^
+|GPIO8  |LoRa NSS|
+|GPIO9  |LoRa SCK|
+|GPIO10 |LoRa MOSI|
+|GPIO11 |LoRa MISO|
+|GPIO12 |LoRa RST|
+|GPIO13 |LoRa BUSY|
+These do not seem to be connected to the header pins.
+=== JTAG ===
+^ Pin ^ Signal ^
+|GPIO39 |MTCK|
+|GPIO40 |MTDO|
+|GPIO41 |MTDI|
+|GPIO42 |MTMS|
+|GPIO3  |Switch: LOW for JTAG on pins, HIGH for USB JTAG. Function fuse dependent.|
+With fuses, GPIO3 sets if JTAG is enabled on these pins or not. All these pins are available on the headers.
+Section 8.5 shows JTAG options:
+[[https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf#bootctrl]]
+Need to blow at least one eFuse to enable JTAG on pins.
+Default value is 0, blow fuse for 1.
+Blow eFuse 3, EFUSE_STRAP_JTAG_SEL, bit 24 of EFUSE_RD_REPEAT_DATA2_REG (0x0038), and pull GPIO3 low for JTAG on pins. Pull high for USB JTAG.
+''espefuse.py  --port /dev/ttyUSB0 burn_efuse STRAP_JTAG_SEL''
+Read fuses:
+''espefuse.py summary''
+=== Other ===
+OLED is on I2C. I2C available on pads on back of board.
+==== Power ====
+Measured with PPK2 SMU, running meshtastic nyan. 5V. Peak current 0.61A, average 120mA. Uses 40mA with reset button held down!
+Powering with 3.3V, normal max 491mA, one peak of 0.64A near start (transmitting?). Average 118mA. 7mA in reset.
+Heltec claim sleep power of: 2mA on USB, 10uA on 3.3V header.
+When 3.3V power connected with reset held, 2.3mA measured. Maybe the 40mA is the radio which was not told to sleep? SX1262 datasheet claims it should be more like 5mA in receive though.
 ===== Heltec Wireless Stick Lite v3 =====
+  * ESP32-S3FN8
+  * SX1262
+  * CP2102
+  * 8MB SiP Flash
 This was straightforward to flash with Meshtastic.
 It has two antenna connectors, one for LoRa, and one for wifi / bluetooth? I could not find any documentation for this, but a forum post somewhere said the connector for LoRa is the one on the top left.
 ===== LILYGO T-Beam =====
@@ Line 59: / Line 124: @@
   * NEO-6M GPS
   * AXP2101 power control chip
-  * CH9102 - WCH USB serial chip.
+  * CH9102F - WCH USB serial chip.
   * MS412FE rechargeable RTC backup battery connected to GPS.
   * micro USB. (Other boards I have have USB C)
+[[https://github.com/Xinyuan-LilyGO/LilyGo-LoRa-Series]]
+[[https://github.com/Xinyuan-LilyGO/LilyGo-LoRa-Series/blob/master/schematic/LilyGo_TBeam_V1.2.pdf|Schematic]]
 Power on seems to require long press on PWR button.
@@ Line 76: / Line 145: @@
 ''./device-install.sh firmware-tbeam-2.1.23.04bbdc6.bin''
+I have since found that the md5 error goes away if programming speed is reduced to 115200 baud. This is surprising as I normally find 1.5 MBaud works reliably for programming ESP8266 with CH340.
 esptool reports:
@@ Line 95: / Line 165: @@
   * ATSAMD21G18 ARM Cortex M0 processor
   * Needs uFL connector added.
+Not supported by meshtastic or RNode.
 ===== Unlabelled / unbranded board =====
@@ Line 102: / Line 174: @@
   * ESP32-DOWD
   * CP2102
+===== Raspberry Pi Pico with Waveshare LoRa and CAN shields =====
+[[https://datasheets.raspberrypi.com/pico/Pico-R3-A4-Pinout.pdf|Pico Pinout]]
+RP2040 has two SPI controllers. It looks like Meshtastic uses SPI1 for the LoRa radio. I'll use SPI0 for the CAN controller. The shields use different pins for the SPI buses.
+==== LoRa ====
+  * SX1262
+  * 22dBm
+  * TX current: 118mA@22dBm
+  * SPI on GP3 CS, 10 CLK, 11 MOSI, 12 MISO.
+  * Has battery on PH1.25 connector
+  * Charger IC: MCP73831
+  * [[https://www.waveshare.com/wiki/Pico-LoRa-SX1262|Waveshare Wiki]]
+  * [[https://www.waveshare.com/pico-lora-sx1262-868m.htm|LoRa shield]]
+==== CAN ====
+  * [[https://www.waveshare.com/product/pico-can-b.htm|CAN Pinout]]
+^ GPIO ^ Function ^
+| 4 | MISO |
+| 5 or 19 | CS |
+| 6 | SCK |
+| 7 | MOSI |
+==== I2C ====
+RP2040 has two I2C peripherals. In Arduino they are called Wire for i2c0 and Wire1 for i2c1.
+I am using I2C1 on GPIOs 14 and 15, pins 19 (SDA) and 20 (SCL) on pico board.