使用官方例程：tty_test_ch9434.c
1、初始化（./cdn_spi_test -D /dev/ttyWCH2 -S 115200 -v）时（波特率115200），RS485提示失能失败；
2、写数据时，串口数据可以收到数据；
3、串口发送数据时，使用例程不能获取数据，将串口的波特率改的小于115200，驱动会打印出日志，越接近115200接收的数据越准确，但是串口设置为115200驱动无反应，没有数据可以接收过来。
4、SPI时钟设置的是3000000。
初始化日志：
# ./cdn_spi_test -D /dev/ttyWCH2 -S 115200 -v
[ 50.582614] ch943x_spi spi2.0: ch943x_pm
[ 50.582673] ch943x_spi spi2.0: ch943x_startup
[ 50.582897] ch943x_spi spi2.0: ch943x_port_write - reg:0xa2, val:0x 6
[ 50.585090] ch943x_spi spi2.0: ch943x_port_write - reg:0xa2, val:0x81
[ 50.585247] ch943x_spi spi2.0: ch943x_port_write - reg:0xa3, val:0x 3
[ 50tty device test ok.
libtty_setopt speed = 115200
.585399] ch943x_spi spi2.0: ch943x_port_write - reg:0xa1, val:0x d
[ 50.585549] ch943x_spi spi2.0: ch943x_port_write - reg:0xa4, val:0x 8
[ 50.585582] ch943x_spi spi2.0: ch943x_set_termios
[ 50.585613] ch943press s to set modem, z to xclear modem, g to get modem,b t_o send break, w to write, r tos read, q for quit.
pi spi2.0: parity = none
[ 50.585759] ch943x_spi spi2.0: ch943x_port_write - reg:0xa3, val:0x 3
[ 50.585790] ch943x_spi spi2.0: ch943x_set_termios disable rts/cts
[ 50.585969] ch943x_spi spi2.0: ch943x_port_read - reg:0x24, val:0x 8
[ 50.586117] ch943x_spi spi2.0: ch943x_port_write - reg:0xa4, val:0x 8
[ 50.586148] ch943x_spi spi2.0: ch943x_set_baud - 9600
[ 50.586295] ch943x_spi spi2.0: ch943x_port_read - reg:0x23, val:0x 3
[ 50.586443] ch943x_spi spi2.0: ch943x_port_write - reg:0xa3, val:0x80
[ 50.586589] ch943x_spi spi2.0: ch943x_port_write - reg:0xa1, val:0x 1
[ 50.586735] ch943x_spi spi2.0: ch943x_port_write - reg:0xa0, val:0xe1
[ 50.586879] ch943x_spi spi2.0: ch943x_port_write - reg:0xa3, val:0x 3
[ 50.586946] ch943x_spi spi2.0: ch943x_set_mctrl - mctrl:0x6
[ 50.586996] ch943x_spi spi2.0: ch943x_md_proc - mcr:0xb, force:0x 8
[ 50.587108] ch943x_spi spi2.0: ch943x_port_write - reg:0xa4, val:0x b
[ 50.587225] ch943x_spi spi2.0: ch943x_ioctl
[ 50.587746] ch943x_spi spi2.0: ch943x_ioctl
[ 50.587975] ch943x_spi spi2.0: ch943x_ioctl
[ 50.588019] ch943x_spi spi2.0: ch943x_ioctl
[ 50.588055] ch943x_spi spi2.0: ch943x_set_termios
[ 50.588080] ch943x_spi spi2.0: parity = none
[ 50.588275] ch943x_spi spi2.0: ch943x_port_write - reg:0xa3, val:0x 3
[ 50.588310] ch943x_spi spi2.0: ch943x_set_termios disable rts/cts
[ 50.588461] ch943x_spi spi2.0: ch943x_port_read - reg:0x24, val:0x b
[ 50.588619] ch943x_spi spi2.0: ch943x_port_write - reg:0xa4, val:0x b
[ 50.588650] ch943x_spi spi2.0: ch943x_set_baud - 115200
[ 50.588794] ch943x_spi spi2.0: ch943x_port_read - reg:0x23, val:0x 3
[ 50.588982] ch943x_spi spi2.0: ch943x_port_write - reg:0xa3, val:0x80
[ 50.589134] ch943x_spi spi2.0: ch943x_port_write - reg:0xa1, val:0x 0
[ 50.589279] ch943x_spi spi2.0: ch943x_port_write - reg:0xa0, val:0x28
[
发送数据日志：
w
[ 130.568970] ch943x_spi spi2.0: ch943x_start_tx
[ 130.569024] chwrote 256 bytes already.
press s to set modem, z to clear modem, g to get modem,b to send bre94ak, w to write, r to read, q f3or quit.
x_spi spi2.0: ch943x_start_tx schedule
[ 130.570148] ch943x_spi spi2.0: ch943x_wq_proc
[ 130.570300] ch943x_spi spi2.0: ch943x_port_read - reg:0x21, val:0x d
[ 130.570408] ch943x_spi spi2.0: ch943x_port_write - reg:0xa1, val:0x f
[ 130.570495] ch943x_spi spi2.0: ch943x_ist interrupt enter...
[ 130.570618] ch943x_spi spi2.0: ch943x_port_read - reg:0x 5, val:0x60
[ 130.570727] ch943x_spi spi2.0: ch943x_port_read - reg:0x 2, val:0x 1
[ 130.570760] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 130.570867] ch943x_spi spi2.0: ch943x_port_read - reg:0x15, val:0x60
[ 130.571120] ch943x_spi spi2.0: ch943x_port_read - reg:0x12, val:0x 1
[ 130.571150] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 130.571245] ch943x_spi spi2.0: ch943x_port_read - reg:0x25, val:0x60
[ 130.571340] ch943x_spi spi2.0: ch943x_port_read - reg:0x22, val:0xc2
[ 92.298165] ch943x_spi spi2.0: ch943x_handle_tx
[ 92.298203] ch943x_spi spi2.0: ch943x_handle_tx 256 bytes
[ 92.298296] ch943x_spi spi2.0: ch943x_raw_write - reg:0xa0
[ 92.298326] ch943x_spi spi2.0: buf[0]:0x 0
[ 92.298417] ch943x_spi spi2.0: ch943x_raw_write - reg:0xa0
[ 92.298447] ch943x_spi spi2.0: buf[0]:0x 1
..........
[ 92.299434] ch943x_spi spi2.0: buf[0]:0x 9
[ 92.299555] ch943x_spi spi2.0: ch943x_raw_write - reg:0xa0
[ 92.299588] ch943x_spi spi2.0: buf[0]:0x a
[ 92.299695] ch943x_spi spi2.0: ch943x_raw_write - r
press s to set modem, z eto clear modem, g to get modem,b to send break, w to gwrite, r to read, q for quit.
:0xa0
[ 92.299726] ch943x_spi spi2.0: buf[0]:0x b
.......
[ 92.326685] ch943x_spi spi2.0: ch943x_raw_write - reg:0xa0
[ 92.326700] ch943x_spi spi2.0: buf[0]:0xfe
[ 92.326772] ch943x_spi spi2.0: ch943x_raw_write - reg:0xa0
[ 92.326786] ch943x_spi spi2.0: buf[0]:0xff
[ 92.326863] ch943x_spi spi2.0: ch943x_port_read - reg:0x25, val:0x 0
[ 92.326954] ch943x_spi spi2.0: ch943x_port_read - reg:0x22, val:0xc2
[ 92.326968] ch943x_spi spi2.0: ch943x_handle_tx
[ 92.326979] ch943x_spi spi2.0: ch943x_handle_tx stopped
[ 92.327055] ch943x_spi spi2.0: ch943x_port_read - reg:0x21, val:0x f
[ 92.327131] ch943x_spi spi2.0: ch943x_port_write - reg:0xa1, val:0x d
[ 92.327205] ch943x_spi spi2.0: ch943x_port_read - reg:0x25, val:0x60
[ 92.327278] ch943x_spi spi2.0: ch943x_port_read - reg:0x22, val:0xc1
[ 92.327291] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 92.327366] ch943x_spi spi2.0: ch943x_port_read - reg:0x35, val:0x60
[ 92.327439] ch943x_spi spi2.0: ch943x_port_read - reg:0x32, val:0x 2
[ 92.327451] ch943x_spi spi2.0: ch943x_handle_tx
[ 92.327462] ch943x_spi spi2.0: ch943x_handle_tx stopped
[ 92.327536] ch943x_spi spi2.0: ch943x_port_read - reg:0x31, val:0x 0
[ 92.327610] ch943x_spi spi2.0: ch943x_port_write - reg:0xb1, val:0x 0
[ 92.327683] ch943x_spi spi2.0: ch943x_port_read - reg:0x35, val:0x60
[ 92.327758] ch943x_spi spi2.0: ch943x_port_read - reg:0x32, val:0x 1
[ 92.327769] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 92.327780] ch943x_spi spi2.0: ch943x_ist end
[ 92.327793] ch943x_spi spi2.0: ch943x_ist interrupt enter...
[ 92.327867] ch943x_spi spi2.0: ch943x_port_read - reg:0x 5, val:0x60
[ 92.327942] ch943x_spi spi2.0: ch943x_port_read - reg:0x 2, val:0x 1
[ 92.327955] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 92.328030] ch943x_spi spi2.0: ch943x_port_read - reg:0x15, val:0x60
[ 92.328104] ch943x_spi spi2.0: ch943x_port_read - reg:0x12, val:0x 1
[ 92.328115] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 92.328190] ch943x_spi spi2.0: ch943x_port_read - reg:0x25, val:0x60
[ 92.328262] ch943x_spi spi2.0: ch943x_port_read - reg:0x22, val:0xc1
[ 92.328272] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 92.328344] ch943x_spi spi2.0: ch943x_port_read - reg:0x35, val:0x60
[ 92.328454] ch943x_spi spi2.0: ch943x_port_read - reg:0x32, val:0x 1
[ 92.328467] ch943x_spi spi2.0: ch943x_port_irq no int, quit
[ 92.328478] ch943x_spi spi2.0: ch943x_ist end
接收日志：无日志。
