## Summary
SPI Poll Send `bl602_spi_poll_send()` doesn't send any SPI Data because it doesn't enable SPI Master and it doesn't clear the SPI FIFO. Also it hangs because it loops forever waiting for the FIFO.
We fix this problem by moving the code that enables SPI Master and clears the FIFO, from SPI Poll Exchange `bl602_spi_poll_exchange()` to SPI Poll Send. (Note that SPI Poll Exchange calls SPI Poll Send)
[More Details Here](https://github.com/lupyuen/st7789-nuttx#fix-spi-send)
## Impact
This problem affects all NuttX Drivers that call `SPI_SEND()` on BL602, including the ST7789 Display Driver.
Previously `SPI_SEND()` didn't send any SPI Data and never returns, because it loops forever waiting to receive data.
Now `SPI_SEND()` sends data and returns correctly.
[More Details Here](https://github.com/lupyuen/st7789-nuttx#fix-spi-send)
## Testing
We tested the modified SPI Poll Send with NuttX ST7789 Driver and a Logic Analyser on PineCone BL602:
- [Testing with Logic Analyser](https://github.com/lupyuen/st7789-nuttx#fix-spi-send)
We also tested LVGL with ST7789 on PineCone BL602:
- [Testing with LVGL](https://github.com/lupyuen/st7789-nuttx#run-lvgl-demo)
As for the modified SPI Poll Exchange, we tested with Semtech SX1262 SPI Transceiver on PineCone BL602:
- [Testing SPI Poll Exchange](https://github.com/lupyuen/incubator-nuttx/releases/tag/release-2022-03-25)
since xcpt always point to the stack after the below change:
commit 7b9978883c
Author: chao.an <anchao@xiaomi.com>
Date: Tue Mar 1 01:06:24 2022 +0800
arch/arm: optimize context switch speed
The current context save implementation saves registers of each task
to xcp context, which is unnecessary because most of the arm registers are
already saved in the task stack, this commit replace the xcp context with
stack context to improve context switching performance and reduce the tcb
space occupation of tcb instance.
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
The xxx_netinitialize is defined to a function only if
CONFIG_NET=y and CONFIG_NETDEV_LATEINIT=n. Otherwise it
is defined to an empty macro.
Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>
restoring/saving coprocessor state.
These function don't use call8 or call12 and thus need to create just 16
bytes for the base save area, however they do use one variable so we
need a space for that. The `entry` instruction works in unit of 8 bytes
so we add whole 8 bytes for one variable.
Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
Also fix an inconsistenct regarding the ESP32S3_NGPIOS macro. Although
correctly defining the number of available GPIOs in ESP32-S3, it was
erroneously being used for verifying the pin range.
Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>
