因此，经过一天的努力，我设法在 IMX7D、5.4.129 内核上安装了 Debian 11，以识别 MAX14830 并通过 MAX310X 驱动程序与其通信。但是当我尝试发送数据时echo a > /dev/ttyMAX0没有任何反应。好吧，除了 Tx 计数上升。
查看 SPI 流量，这似乎是正确的，并且芯片正在发送预期的响应（如果正在发送三个字符，则 Tx FIFO 计数返回三个）但缓冲区似乎没有发生任何事情。驱动程序不断询问最大值，但 FIFO 保持在 3。然后驱动程序达到超时，我猜。因为它然后发送 0x81,0x00 清除 IRQen 寄存器，然后发送 0x9B 0x40 设置波特率寄存器......这使得它更加混乱。
到目前为止，我已经完成了所有stty设置并用于-ixon禁用 XON/XOFF，但这并没有什么不同。
是否有保存驱动程序设置的方法/位置/文件？还是我忘记了什么？RX 似乎也不起作用，但不确定 max 是否没有收到它或只是没有通知驱动程序。
DTS 的相关部分
&ecspi3 {
max14830: max14830@3 {
compatible = "maxim,max14830";
spi-max-frequency = <15000000>;
reg = <0>; // SPI chip select number
clocks = <&clk16m0>;
clock-names = "osc";
interrupt-parent = <&gpio5>;
interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
gpio-controller; // Marks the device node as a GPIO controller
#gpio-cells = <2>;
clk16m0: clk16m0 {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <3686400>; // freq of external xtal
clock-accuracy = <100>;
};
};
};
以及启动期间的通讯
OUT IN MEANING
0x9F 0xCE -> Write globalCmd = Enable Extend register map acces
0x05 0x00 -> 0x0F 0xB4 -> Clear SpclChrIntEn= RevID is B4
0x9F 0xCD -> Write globalCmd = Disable Extend register map access
0x8A 0x01 -> Write UART0 Mode2 = Set RST
0x8A 0x00 -> Write UART0 Mode2 = Clear RST
0x1C 0x00 -> 0x0F 0x01 -> Read UART0 DivLSB = Div0 set
0x89 0x80 -> Set UART0 MODE1 = ~RTS0 is three state
0xAA 0x01 -> Write UART1 Mode2 = Set RST
0xAA 0x00 -> Write UART1 Mode2 = Clear RST
0x3C 0x00 -> 0x0F 0x01 -> Read UART1 DivLSB = Div0 set
0xA9 0x80 -> Set UART1 MODE1 = ~RTS1 is three state
0xCA 0x01 -> Write UART2 Mode2 = Set RST
0xCA 0x00 -> Write UART2 Mode2 = Clear RST
0x5C 0x00 -> 0xF 0x01 -> Read UART2 DivLSB = Div0 set
0xC9 0x80 -> Set UART2 MODE1 = ~RTS2 is three state
0xEA 0x01 -> Write UART3 Mode2 = Set RST
0xEA 0x00 -> Write UART3 Mode2 = Clear RST
0x7C 0x00 -> 0x0F 0x01 -> Read UART3 DivLSB = Div0 set
0xE9 0x80 -> Set UART3 MODE1 = ~RTS3 is three state
0x9A 0x44 -> Write PLLConfig = Set PreDiv5 and PreDiv2
0x9E 0x14 -> Write ClockSource = 0001 0100 -> first 1 at dont care, second PLLen
0x81 0x00 -> Clear IRQen UART0
0x02 0x00 -> 0x0F 0x60 -> Read ISR UART0 = both fifo empty
0x1B 0x00 -> 0x0F 0x00 -> Read BRConfig UART0 -> all clear
0x9B 0x40 -> Write BRConfig UART0 -> FRACT2 Set
0xA1 0x00 -> Clear IRQen UART1
0x22 0x00 -> 0x0F 0x60 -> Read ISR UART1 = both fifo empty
0x3B 0x00 -> 0x0F 0x00 -> Read BRConfig UART1 -> all clear
0xBB 0x40 -> Write BRConfig UART1 -> FRACT2 Set
0xC1 0x00 -> Clear IRQen UART2
0x42 0x00 -> 0x0F 0x60 -> Read ISR UART2 = both fifo empty
0x58 0x00 -> 0x0F 0x00 -> Read BRConfig UART2 -> all clear
0xDB 0x40 -> Write BRConfig UART2 -> FRACT2 Set
0xE1 0x00 -> Clear IRQen UART3
0x62 0x00 -> 0x0F 0x60 -> Read ISR UART3 = both fifo empty
0x7B 0x00 -> 0x0F 0x00 -> Read BRConfig UART3 -> all clear
0xFB 0x40 -> Write BRConfig UART3 -> FRACT2 Set
ttyMAX0 根据stty
结果设置stty -F /dev/ttyMAX0
-parenb -> don't generate parity
-parodd -> Even parity?
-cmspar -> No stick parity
cs8 -> character size 8 bits
hupcl -> don't send hangup signal
-cstopb -> use one bit per character
cread -> allow input to be received
clocal -> disable modem control signals
-crtscts -> dont enable rts/cts handschaking
-ignbr -> don't ignore break characters
-brkint -> breaks don't cause an interrupt signal
-ignpar -> don't ignore characters with parity errors
-parmrk -> don't mark parity errors
-inpck -> don't enable parity checking
-istrip -> don't clear high (8th) bit of input characters
-inlcr -> dont translate newline to carriage return
-igncr -> don't ignore carriage return
icrnl -> don't translate carriage return to newline
-ixon -> disable XON/XOFF flow control
-ixoff -> disable sending of start/stop characters
-iuclc -> don't translate uppercase to lowercase
-ixany -> Don't let any character restart output
-imaxbel -> don't beep and flush
-iutf8 -> don't assume characters are utf8 encoded
OUTPUT SETTINGS
opost -> post process output
-olcuc -> don't translate lower to upper
-ocrnl -> don't translate carriage return to newline
onlcr -> translate newline to carriage return newline
-onocr -> print carriage return in the first column
-onlret -> newline doesn't perform a carriage return
-ofill -> don't use fill characters instead of timing for delays
-ofdel -> don't use delete character for fill instead of null
nl0
cr0
tab0 -> horizontal tab delay style 0
bs0
vt0
ff0 -> form feed delay style
isig -> enable interrpt,
icanon -> enable special characters: erase, kill, werase, rprnt
iexten -> enable non-POSIX special characters
echo -> echo input characters
echoe -> echo erase characters as backspace-space-backspace
echok -> echo a newline after a kill character
-echonl
-noflsh -> don't disable flushing after interrupt & quit special
chars
-xcase
-tostop
-echoprt
echoctl -> echo control characters in hat notation ('^c')
echoke -> kill all line by obeying the echoprt and echoe settings
-flusho
-extproc