Lup Yuen Lee 李立源 @lupyuen@qoto.org

HiFive Unmatched: Exploring A #RISCV Computing Experience

https://hothardware.com/reviews/hifive-unmatched-a-risc-v-proposition

Weekly #Linux Phone news / media roundup

https://linmob.net/linbits-73-weekly-linux-phone-news-week47-48/

We can swap MISO and MOSI on #BL602 by setting a Hardware Register ... Let's do this on #NuttX

https://lupyuen.github.io/articles/pinedio#spi-pins-are-swapped

Logic Analyser connected to #BL602 shows that MISO and MOSI are swapped! This happens in BL602 IoT SDK ... Also in #NuttX!

https://lupyuen.github.io/articles/spi#spi-data-pins-are-flipped

#NuttX's SPI Pins match the #BL602 Reference Manual: MOSI = GPIO 1, MISO = GPIO 0 ... But we're about to witness a BL602 SPI Quirk

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

In #NuttX the SPI Pins for #BL602 are defined in "board.h" ... MOSI is GPIO 1, MISO is GPIO 0

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/boards/risc-v/bl602/bl602evb/include/board.h#L87-L92

How to verify the #NuttX SPI Output? We sniff the #BL602 SPI Bus with a Logic Analyser

https://lupyuen.github.io/articles/spi#appendix-troubleshoot-bl602-spi-with-logic-analyser

#RISCV Processors expected to double in 2022, and double again in 2023

https://www.techrepublic.com/article/risc-vs-open-chip-processors-expected-to-double-in-2022-and-double-again-in-2023/

Now we see every byte transferred by #NuttX's SPI Driver for #BL602!

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

To watch what happens inside #NuttX's SPI Driver for #BL602 ... Turn on SPI Debug Logging

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/arch/risc-v/src/bl602/bl602_spi.c

Rockchip RK3588 benchmarks show up on Geekbench

https://www.cnx-software.com/2021/12/01/rockchip-rk3588-benchmarks-show-up-on-geekbench/

Here's how we configure the #NuttX SPI Interface

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/drivers/rf/spi_test_driver.c#L95-L117

"WTF is Wrong with #OpenSource Communities?" (Diversity)

https://blog.container-solutions.com/wtf-is-wrong-with-open-source-communities

"FBI document shows what data can be obtained from encrypted messaging apps"

https://therecord.media/fbi-document-shows-what-data-can-be-obtained-from-encrypted-messaging-apps/

In the write() operation for our #NuttX SPI Test Driver, we 1️⃣ Lock the SPI Bus 2️⃣ Config the SPI Interface 3️⃣ Select the SPI Device 4️⃣ Transfer SPI Data 5️⃣ Deselect and Unlock

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/drivers/rf/spi_test_driver.c#L182-L239

Every #NuttX Device Driver defines the File Operations for the device ... Here are the open(), close(), read(), write() and ioctl() operations for our SPI Test Driver

https://github.com/lupyuen/incubator-nuttx/blob/spi_test/drivers/rf/spi_test_driver.c#L80-L89

"Windows Games on the #PineBook Pro with BOX86 and Wine"

https://youtu.be/mckk7bkeNMU

This appears when we run our #NuttX SPI Test App ... Let's study our SPI Test Driver

https://github.com/lupyuen/incubator-nuttx-apps/blob/spi_test/examples/spi_test/spi_test_main.c

Running Octoprint On A #PinePhone Turns Out To Be Pretty Easy

https://hackaday.com/2021/11/30/running-octoprint-on-a-pinephone-turns-out-to-be-pretty-easy/

Discussion on Hacker News: https://news.ycombinator.com/item?id=29390751