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上面是 xboot 作者回复的，怎么可能没有用?
现在是什么问题呢?
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我不知道我要去哪裡哪裡，我把這段代碼保存為“ main.lua”，在Uart1或Uart2中我沒有任何答案。
僅在Uart0上進行Xboot調試
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首先，看你有没有使能uart1? GPIO复用是否正确?
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我沒有做任何更改，我以為只是編譯和使用。
如何“解僱” Uart1？
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"uart-16550@0x01c25000": {
"clock-name": "link-uart0",
"reset": 84,
"txd-gpio": 129,
"txd-gpio-config": 5,
"rxd-gpio": 128,
"rxd-gpio-config": 5,
"baud-rates": 115200,
"data-bits": 8,
"parity-bits": 0,
"stop-bits": 1
},"uart-16550@0x01c25400": {
"clock-name": "link-uart1",
"reset": 85,
"txd-gpio": 3,
"txd-gpio-config": 5,
"rxd-gpio": 2,
"rxd-gpio-config": 5,
"baud-rates": 115200,
"data-bits": 8,
"parity-bits": 0,
"stop-bits": 1
},"uart-16550@0x01c25800": {
"clock-name": "link-uart2",
"reset": 86,
"txd-gpio": 135,
"txd-gpio-config": 3,
"rxd-gpio": 136,
"rxd-gpio-config": 3,
"baud-rates": 115200,
"data-bits": 8,
"parity-bits": 0,
"stop-bits": 1
},
F1C100S有三个串口，具体使用哪一个pin脚，可以查看具体的gpio编号，注册成功后，系统里会存在三个串口设备，名字分别为uart-16550.0， uart-16550.1，uart-16550.2，使用串口的话，就是先获取对象，然后调用操作这个对象的方法，lua接口仅仅是接口的封装，可以直接查看接口源码：
static int l_uart_new(lua_State * L)
{
const char * name = luaL_checkstring(L, 1);
struct uart_t * uart = search_uart(name);
if(!uart)
return 0;
if(lua_gettop(L) > 1)
{
int baud = luaL_optinteger(L, 2, 115200);
int data = luaL_optinteger(L, 3, 8);
int parity = luaL_optinteger(L, 4, 0);
int stop = luaL_optinteger(L, 5, 1);
uart_set(uart, baud, data, parity, stop);
}
lua_pushlightuserdata(L, uart);
luaL_setmetatable(L, MT_HARDWARE_UART);
return 1;
}static int l_uart_list(lua_State * L)
{
struct device_t * pos, * n;
struct uart_t * uart;lua_newtable(L);
list_for_each_entry_safe(pos, n, &__device_head[DEVICE_TYPE_UART], head)
{
uart = (struct uart_t *)(pos->priv);
if(!uart)
continue;
lua_pushlightuserdata(L, uart);
luaL_setmetatable(L, MT_HARDWARE_UART);
lua_setfield(L, -2, pos->name);
}
return 1;
}static const luaL_Reg l_uart[] = {
{"new", l_uart_new},
{"list", l_uart_list},
{NULL, NULL}
};static int m_uart_tostring(lua_State * L)
{
struct uart_t * uart = luaL_checkudata(L, 1, MT_HARDWARE_UART);
lua_pushstring(L, uart->name);
return 1;
}static int m_uart_set(lua_State * L)
{
struct uart_t * uart = luaL_checkudata(L, 1, MT_HARDWARE_UART);
int baud = luaL_optinteger(L, 2, 115200);
int data = luaL_optinteger(L, 3, 8);
int parity = luaL_optinteger(L, 4, 0);
int stop = luaL_optinteger(L, 5, 1);
uart_set(uart, baud, data, parity, stop);
lua_settop(L, 1);
return 1;
}static int m_uart_get(lua_State * L)
{
struct uart_t * uart = luaL_checkudata(L, 1, MT_HARDWARE_UART);
int baud, data, parity, stop;
uart_get(uart, &baud, &data, &parity, &stop);
lua_pushinteger(L, baud);
lua_pushinteger(L, data);
lua_pushinteger(L, parity);
lua_pushinteger(L, stop);
return 4;
}static int m_uart_read(lua_State * L)
{
struct uart_t * uart = luaL_checkudata(L, 1, MT_HARDWARE_UART);
size_t count = luaL_checkinteger(L, 2);
if(count <= 0)
{
lua_pushnil(L);
}
else if(count <= SZ_4K)
{
char buf[SZ_4K];
if(uart_read(uart, (u8_t *)buf, count) == count)
lua_pushlstring(L, buf, count);
else
lua_pushnil(L);
}
else
{
char * p = malloc(count);
if(p && uart_read(uart, (u8_t *)p, count) == count)
lua_pushlstring(L, p, count);
else
lua_pushnil(L);
free(p);
}
return 1;
}static int m_uart_write(lua_State * L)
{
struct uart_t * uart = luaL_checkudata(L, 1, MT_HARDWARE_UART);
size_t count;
const char * buf = luaL_checklstring(L, 2, &count);
if(count > 0)
lua_pushboolean(L, (uart_write(uart, (const u8_t *)buf, count) == count));
else
lua_pushboolean(L, 0);
return 1;
}static const luaL_Reg m_uart[] = {
{"__tostring", m_uart_tostring},
{"set", m_uart_set},
{"get", m_uart_get},
{"read", m_uart_read},
{"write", m_uart_write},
{NULL, NULL}
};int luaopen_hardware_uart(lua_State * L)
{
luaL_newlib(L, l_uart);
luahelper_create_metatable(L, MT_HARDWARE_UART, m_uart);
return 1;
}
按照这个流程跟踪下去，就可以了解所有细节了，xboot整个抽象层是很薄的，不会有叠罗汉现象，花点时间就可以理解透的。
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我相信我的Lichee Nano遇到麻煩了。
"uart-16550@0x01c25000": {
"clock-name": "link-uart0",
"reset": 84,
"txd-gpio": 129,
"txd-gpio-config": 5,
"rxd-gpio": 128,
"rxd-gpio-config": 5,
"baud-rates": 115200,
"data-bits": 8,
"parity-bits": 0,
"stop-bits": 1
},"uart-16550@0x01c25400": {
"clock-name": "link-uart1",
"reset": 85,
"txd-gpio": 3,
"txd-gpio-config": 5,
"rxd-gpio": 2,
"rxd-gpio-config": 5,
"baud-rates": 115200,
"data-bits": 8,
"parity-bits": 0,
"stop-bits": 1
},"uart-16550@0x01c25800": {
"clock-name": "link-uart2",
"reset": 86,
"txd-gpio": 135,
"txd-gpio-config": 3,
"rxd-gpio": 136,
"rxd-gpio-config": 3,
"baud-rates": 115200,
"data-bits": 8,
"parity-bits": 0,
"stop-bits": 1
},
一切都好
我嘗試了不同的組合 Lua:
-----------------------------------------
local uart1 = Uart.new("uart-16550.1", 115200, 8, 0, 1)
uart1.write("Hello World")
------------------------------------------
local uart1 = Uart.new("uart1", 115200, 8, 0, 1)
uart1.write("Hello World")
------------------------------------------
local uart1 = Uart.new("link-uart1", 115200, 8, 0, 1)
uart1.write("Hello World")
------------------------------------------
local uart1 = Uart.new("uart-16550@0x01c25400", 115200, 8, 0, 1)
uart1.write("Hello World")
E etc...
我想讓串行通訊（Uart）在 Lua no Xboot
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