164 lines
2.7 KiB
Lua
164 lines
2.7 KiB
Lua
-- SPI 硬件
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--
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SPI_SUCCESS = 0
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SPI_FAILED = 1
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-- 全局文件句柄
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fd = 0
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-- 这个函数是辅助用的，它能够打印一张表出来
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function print_table(t, indent)
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indent = indent or 0
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for k, v in pairs(t) do
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if type(v) == 'table' then
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print(string.rep(' ', indent) .. k .. ":")
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print_table(v, indent + 2)
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else
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print(string.rep(' ', indent) .. k .. ": " .. tostring(v))
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end
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end
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end
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function build(data)
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-- 检查该参数是否是一张表
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if type(data) ~= "table" then
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return {
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result = "ERR",
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message = "Invalid Arguments: table"
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}
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end
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print("-------- SPI.Lua builder func get a table --------")
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print_table(data)
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print("--------------------------------------------------")
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local path = data.path
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-- 检查文件句柄参数是否存在
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if path == nil then
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return {
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result = "ERR",
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message = "Invalid Arguments: path"
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}
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end
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-- 模式
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local spi_mode = data.spi_mode
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if spi_mode == nil then
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return {
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result = "ERR",
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message = "Invalid Arguments: spi_mode"
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}
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end
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print(spi_mode)
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spi_mode = tonumber(spi_mode)
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-- 比特
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local bits = data.bits
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if bits == nil then
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return {
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result = "ERR",
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message = "Invalid Arguments: bits"
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}
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end
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bits = tonumber(bits)
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-- 速率
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local speed = data.speed
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if speed == nil then
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return {
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result = "ERR",
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message = "Invalid Arguments: speed"
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}
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end
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speed = tonumber(speed)
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--
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local delay = data.delay
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if delay == nil then
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return {
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result = "ERR",
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message = "Invalid Arguments: delay"
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}
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end
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delay = tonumber(delay)
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-- 开始执行
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fd = spi_open(path)
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if fd <= 0 then
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return {
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result = "ERR",
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message = "Failed to open SPI file"
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}
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end
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local res = spi_setup(fd, spi_mode, bits, speed, delay)
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if res ~= 0 then
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return {
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result = "ERR",
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message = "Failed to setup SPI device"
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}
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end
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return {
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result = "OK",
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fd = fd
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}
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end
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function destroy(data)
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-- 检查该参数是否是一张表
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if type(data) ~= "table" then
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return {
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result = "ERR",
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message = "Invalid Arguments: table"
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}
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end
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print("-------- SPI.Lua ender func get a table --------")
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print_table(data)
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print(string.format("now fd: %i", fd))
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print("------------------------------------------------")
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spi_close(fd)
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fd = -1
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return {
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result = "OK"
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}
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end
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function call(data)
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-- 检查该参数是否是一张表
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if type(data) ~= "table" then
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return {
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result = "ERR",
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message = "Invalid Arguments: table"
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}
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end
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print("-------- SPI.Lua caller func get a table --------")
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print_table(data)
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print("-------------------------------------------------")
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return {
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fd = fd
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}
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end
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