Lup Yuen Lee 李立源 @lupyuen@qoto.org

Here's our #NuttX App controlling SPI Chip Select via GPIO

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L42-L74

"Grab tumbles 33% on Nasdaq debut day"

https://www.businesstimes.com.sg/garage/grab-tumbles-33-on-nasdaq-debut-day-fails-to-sustain-initial-surge

#BL602 SPI Chip Select has a problem ... It goes High after EVERY byte ... Which is no-no for SX1262 ... Solution: We control Chip Select via GPIO

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L42-L74

Our #NuttX App transmits an SPI Command to SX1262 ... And reads the SPI Response from SX1262

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test2/spi_test2_main.c#L54-L84

We implement the Read Operation for our #NuttX SPI Driver ... So that we can fetch the SPI Response from SX1262

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/drivers/rf/spi_test_driver.c#L210-L233

"SiFive Performance P650 #RISCV core to outperform Arm Cortex-A77 performance per mm2"

https://www.cnx-software.com/2021/12/03/sifive-performance-p650-risc-v-core-to-outperform-arm-cortex-a77-performance-per-mm2/

"Milk Tea Vending Machine" (Robot Arm)

https://youtu.be/pz-4uHcViUg

SiFive Announces Latest #RISCV CPU: P650

https://www.tomshardware.com/news/sifive-announces-p650-riscv

Let's test #NuttX SPI with #BL602 and Semtech SX1262 LoRa Transceiver

https://www.semtech.com/products/wireless-rf/lora-core/sx1262

Why It’s So Difficult — And Costly — To Secure Chips

https://semiengineering.com/why-its-so-difficult-and-costly-to-secure-chips/

"New Vector, Scalar Cryptography and Hypervisor specifications will help accelerate the adoption of #RISCV across a variety of market segments" (IoT / AI / ML)

https://riscv.org/announcements/2021/12/riscv-ratifies-15-new-specifications/

FTC Sues to Block $40 Billion Nvidia-Arm Merger

https://www.ftc.gov/news-events/press-releases/2021/12/ftc-sues-block-40-billion-semiconductor-chip-merger

"Mario-inspired Instant Pot Steam Director" (3D Print)

https://www.reddit.com/r/functionalprint/comments/r6w0mp/mario_inspired_instant_pot_steam_director/?utm_medium=android_app&utm_source=share

#RustLang on ESP Book

https://esp-rs.github.io/book/introduction.html

"Which Microcontroller should I use to get started with #Embedded Systems?"

https://www.reddit.com/r/embedded/comments/r79ucu/which_microcontroller_should_i_use_to_get_started/?utm_medium=android_app&utm_source=share

After swapping #BL602 MISO and MOSI at #NuttX startup ... Logic Analyser shows that the SPI Pins are now consistent with BL602 Reference Manual! 🎉

https://github.com/lupyuen/incubator-nuttx/blob/swap_miso_mosi/arch/risc-v/src/bl602/bl602_spi.c#L1080-L1140

"Can Russell Crowe succeed in cleaning up Bangkok’s terrible wiring?"

https://www.theguardian.com/world/2021/dec/02/can-russell-crowe-succeed-in-cleaning-up-bangkoks-terrible-wiring

Twitter: "Disclosing state-linked information operations we've removed"

https://blog.twitter.com/en_us/topics/company/2021/disclosing-state-linked-information-operations-we-ve-removed

"Testing Phone-Sized Faraday Bags"

https://www.mattblaze.org/blog/faraday/