Lup Yuen Lee 李立源 @lupyuen@qoto.org

Why my #BL602 I2C Program crashed ... And the 2 levels of BL602 I2C HAL

https://github.com/lupyuen/bl_iot_sdk/releases/tag/v1.0.1

When the #BL602 I2C HAL looks dubious ... Refer to the BL602 Reference Manual!

https://github.com/bouffalolab/bl_docs/tree/main/BL602_RM/en

How we hack #PineCone #BL602 #RISCV on Saturday Night @PINE64

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c#L216-L308

#BL602 I2C program doesn't crash now ... But it doesn't read any data from the BME280 Sensor 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c#L216-L308

Found the bug in my #BL602 I2C program ... There are two levels of BL602 I2C API: 1️⃣ High Level (which calls FreeRTOS) 2️⃣ Low Level (which doesn't call FreeRTOS) ... I'm using the Low Level API, so I shouldn't call "hal_i2c_init" in the High Level API

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/main.c#L187-L190

Here's how we dump the #RISCV Disassembly from the #BL602 ELF Executable

https://github.com/lupyuen/bl_iot_sdk/releases/tag/v1.0.1

Let's hunt for MEPC (Machine Exception Program Counter) 0x2300 8fe2 in the #RISCV Disassembly ... Yep my buggy code crashed in the #BL602 I2C Interrupt Handler 🤔

https://github.com/lupyuen/bl_iot_sdk/releases/download/v1.0.1/sdk_app_i2c.S

My First #RISCV Exception on #PineCone #BL602 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c#L234-L308

600 Views of my Buggy C Code for #BL602 I2C ... Time to Hyperventilate 😲

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c#L234-L308

Lunar New Year Challenge in Singapore ... Think I'll skip it altogether 🤔

Oops #BL602 needs to trigger an #I2C Receive Interrupt before we read the I2C FIFO Input ... So we should call the BL602 I2C Functions in two steps

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c#L271-L299

#BL602 has an I2C queue of 4 bytes ... So we'll send/receive I2C data 4 bytes at a time with interrupts

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c#L238-L263

#BL602 reading #I2C Register on BME280 ... Hope this works 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c#L234-L277

The second #Pico core complicates #RustLang

https://www.reddit.com/r/rust/comments/l1uwyu/would_it_be_possible_to_run_rust_on_the_new/gk2lstw?utm_medium=android_app&utm_source=share&context=3

6 undocumented #BL602 I2C Functions ... Let's figure out how to call them 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/i2c/customer_app/sdk_app_i2c/sdk_app_i2c/demo.c

#Photography cheat sheet

https://www.reddit.com/r/coolguides/comments/l1k4ma/neat_photography_cheat_sheet_for_beginner/?utm_medium=android_app&utm_source=share

#BL602 IoT SDK builds OK on #Pinebook Pro ... After replacing the bundled #RISCV GCC Toolchain by the Arm64 version

"When designing a program..."

https://www.reddit.com/r/coolguides/comments/kzwgsk/when_considering_designing_a_program/?utm_medium=android_app&utm_source=share

Connect #PineCone #BL602 to BME280 ... Temperature, humidity and air pressure over I2C

https://learn.sparkfun.com/tutorials/sparkfun-bme280-breakout-hookup-guide/all

#BL602 IoT SDK tries to init pins 3 and 4 for I2C ... Guess what happens when "i2cx" is NOT "I2C0" ? 🤔

https://github.com/bouffalolab/bl_iot_sdk/blob/master/components/hal_drv/bl602_hal/bl_i2c.c#L57-L69