Differences

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--- nyan:lora_dev_boards [2024/03/11 22:57] – 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 ===
@@ Line 174: / Line 179: @@
 [[https://datasheets.raspberrypi.com/pico/Pico-R3-A4-Pinout.pdf|Pico Pinout]]
-RP2040 has two SPI controllers.
+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 ====
@@ Line 197: / Line 202: @@
 | 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.