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--- nyan:lora_dev_boards [2024/02/12 02:59] – river
+++ nyan:lora_dev_boards [2024/06/20 03:01] (current) – river
@@ Line 48: / Line 48: @@
 ==== 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 ===
@@ Line 68: / Line 72: @@
 |GPIO41 |MTDI|
 |GPIO42 |MTMS|
+|GPIO3  |Switch: LOW for JTAG on pins, HIGH for USB JTAG. Function fuse dependent.|
-GPIO3 With fuses, affects is JTAG is enable on these pins or not. All these pins are available on the headers.
+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.
@@ Line 93: / Line 127: @@
   * 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 108: / Line 146: @@
 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 137: / 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.