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--- nyan:lora_dev_boards [2024/02/14 00:42] – river
+++ nyan:lora_dev_boards [2024/06/20 03:01] (current) – river
@@ Line 72: / 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:
@@ Line 84: / Line 85: @@
 ''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 =====
@@ Line 164: / Line 179: @@
 [[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, 10, 11, 12.
+  * SPI on GP3 CS, 10 CLK, 11 MOSI, 12 MISO.
   * Has battery on PH1.25 connector
   * Charger IC: MCP73831
@@ Line 176: / Line 193: @@
 ==== CAN ====
   * [[https://www.waveshare.com/product/pico-can-b.htm|CAN Pinout]]
-  * SPI on GP4, 5 or 19 (CS), 6, 7.
+^ 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.