1.新增IIC Slave mode例程和串口升级应用例程
2.更新RF18.8参数
3.新增32M Byte Flash驱动使用
4.优化96M主频使用方式

1.增加PWM的bxd_pwm_start2接口函数，可直接设置high和low
2.更新spim_intr和spis_intr例程和文档说明

optimize phase noise

update bxd_spim.c

1.Resolve bug that can go wrong when you use bx_dWork and bx_defer together
2.change kernel data config size in base demo

1. rename llc_version_patch.s and lld_scan_stop.s to fix bug on mdk v5.26

1.32768 LXT free
2.The RF Parameter Version updated to 18.7
3.Automatic adjustment of RF parameters in low temperature and low pressure environment
4.Added QSPI 4-wire drive LCD, up to 48M
5.Fixed bug where Flash could read and write incorrectly in certain conditions
6.Optimize the organization structure of log file
7.Change the name of bx_service_xxx to bxs_xxx, and change the name of bx_drv_xxx to bxd_xxx for a more concise name

1.Fix that bx_public cannot be published to multiple subscribers
2.Increase the UART baud rate
3.Correction lockless FIFO
4.Correction wdt

Version 3.1

1. fixed known errors
2. delete redundant code

Version 3.0