LuatOS/luat/modules/luat_lib_i2c.c

/*
@module  i2c
@summary I2C操作
@version 1.0
@date    2020.03.30
*/
#include "luat_base.h"
#include "luat_log.h"
#include "luat_timer.h"
#include "luat_malloc.h"
#include "luat_i2c.h"

#define LUAT_LOG_TAG "luat.i2c"
#include "luat_log.h"
/*
i2c编号是否存在
@api i2c.exist(id)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@return int 存在就返回1,否则返回0
@usage
-- 检查i2c1是否存在
if i2c.exist(1) then
    log.info("存在 i2c1")
end
*/
static int l_i2c_exist(lua_State *L) {
    int re = luat_i2c_exist(luaL_checkinteger(L, 1));
    lua_pushinteger(L, re);
    return 1;
}

/*
i2c初始化
@api i2c.setup(id)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@return int 成功就返回1,否则返回0
@usage
-- 初始化i2c1
if i2c.setup(1) == 0 then
    log.info("存在 i2c1")
else
    i2c.close(1) -- 关掉
end
*/
static int l_i2c_setup(lua_State *L) {
    int re = luat_i2c_setup(luaL_checkinteger(L, 1), luaL_optinteger(L, 2, 0), luaL_optinteger(L, 3, 0));
    lua_pushinteger(L, re == 0 ? luaL_optinteger(L, 2, 0) : -1);
    return 1;
}

/*
i2c发送数据
@api i2c.send(id, addr, data)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@int I2C子设备的地址, 7位地址
@string 待发送的数据
@return nil 无返回值
@usage
-- 往i2c1发送2个字节的数据
i2c.send(1, 0x5C, string.char(0x0F, 0x2F))
*/
static int l_i2c_send(lua_State *L) {
    int id = luaL_checkinteger(L, 1);
    int addr = luaL_checkinteger(L, 2);
    size_t len;
    if (lua_isstring(L, 3)) {
        const char* buff = luaL_checklstring(L, 3, &len);
        luat_i2c_send(id, addr, (char*)buff, len);
    }
    else if (lua_isinteger(L, 3)) {
        len = lua_gettop(L) - 2;
        char buff[len+1];
        for (size_t i = 0; i < len; i++)
        {
            buff[i] = lua_tointeger(L, 3+i);
        }
        luat_i2c_send(id, addr, buff, len);
    }
    return 0;
}

/*
i2c接收数据
@api i2c.recv(id, addr, len)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@int I2C子设备的地址, 7位地址
@int 手机数据的长度
@return string 收到的数据
@usage
-- 从i2c1读取2个字节的数据
local data = i2c.recv(1, 0x5C, 2)
*/
static int l_i2c_recv(lua_State *L) {
    int id = luaL_checkinteger(L, 1);
    int addr = luaL_checkinteger(L, 2);
    int len = luaL_checkinteger(L, 3);
    char buf[len];
    luat_i2c_recv(id, addr, &buf[0], len);
    lua_pushlstring(L, buf, len);
    return 1;
}

/*
i2c写寄存器数据
@api i2c.writeReg(id, addr, reg, data)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@int I2C子设备的地址, 7位地址
@int 寄存器地址
@string 待发送的数据
@return int 发送数据的结果，0为成功
@usage
-- 从i2c1的地址为0x5C的设备的寄存器0x01写入2个字节的数据
i2c.writeReg(1, 0x5C, 0x01, string.char(0x00, 0xF2))
*/
static int l_i2c_write_reg(lua_State *L) {
    int id = luaL_checkinteger(L, 1);
    int addr = luaL_checkinteger(L, 2);
    int reg = luaL_checkinteger(L, 3);
    size_t len;
    const char* lb = luaL_checklstring(L, 4, &len);
    char* buff = (char*)luat_heap_malloc(sizeof(char)*len+1);
    *buff = (char)reg;
    memcpy(buff+1,lb,sizeof(char)+len+1);
    int result = luat_i2c_send(id, addr, buff, len+1);
    luat_heap_free(buff);
    return result;
}

/*
i2c读寄存器数据
@api i2c.readReg(id, addr, reg, len)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@int I2C子设备的地址, 7位地址
@int 寄存器地址
@int 待接收的数据长度
@return string 收到的数据
@usage
-- 从i2c1的地址为0x5C的设备的寄存器0x01读出2个字节的数据
i2c.readReg(1, 0x5C, 0x01, 2)
*/
static int l_i2c_read_reg(lua_State *L) {
    int id = luaL_checkinteger(L, 1);
    int addr = luaL_checkinteger(L, 2);
    int reg = luaL_checkinteger(L, 3);
    int len = luaL_checkinteger(L, 4);
    char temp = (char)reg;
    int result = luat_i2c_send(id, addr, &temp, 1);
    if(result!=0){//如果返回值不为0，说明收失败了
        LLOGD("i2c send result %d", result);
        lua_pushlstring(L, NULL, 0);
        return 1;
    }
    char* buff = (char*)luat_heap_malloc(sizeof(char)*len);
    result = luat_i2c_recv(id, addr, buff, len);
    if(result!=0){//如果返回值不为0，说明收失败了
        len = 0;
        LLOGD("i2c receive result %d", result);
    }
    lua_pushlstring(L, buff, len);
    luat_heap_free(buff);
    return 1;
}

/*
关闭i2c设备
@api i2c.close(id)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@return nil 无返回值
@usage
-- 关闭i2c1
i2c.close(1)
*/
static int l_i2c_close(lua_State *L) {
    int id = luaL_checkinteger(L, 1);
    luat_ic2_close(id);
    return 0;
}

/*
从i2c总线读取DHT12的温湿度数据
@api i2c.readDHT(id)
@int 设备id, 例如i2c1的id为1, i2c2的id为2
@int DHT12的设备地址,默认0x5C
@return boolean 读取成功返回true,否则返回false
@return int 湿度值,单位0.1%, 例如 591 代表 59.1%
@return int 温度值,单位0.1摄氏度, 例如 292 代表 29.2摄氏度
@usage
-- 从i2c0读取DHT12
i2c.setup(0)
local re, H, T = i2c.readDHT(0)
if re then
    log.info("dht12", H, T)
end
*/
static int l_i2c_readDHT12(lua_State *L) {
    int id = luaL_checkinteger(L, 1);
    int addr = luaL_optinteger(L, 2, 0x5C);
    char buff[5] = {0};
    char temp = 0x00;
    int result = luat_i2c_send(id, addr, &temp, 1);
    result = luat_i2c_recv(id, addr, buff, 5);
    if (result) {
        lua_pushboolean(L, 0);
        return 1;
    }
    else {
        if (buff[0] == 0 && buff[1] == 0 && buff[2] == 0 && buff[3] == 0 && buff[4] == 0) {
            LLOGD("DHT12 DATA emtry");
            lua_pushboolean(L, 0);
            return 1;
        }
        // 检查crc值
        LLOGD("DHT12 DATA %02X%02X%02X%02X%02X", buff[0], buff[1], buff[2], buff[3], buff[4]);
        uint8_t crc_act = (uint8_t)buff[0] + (uint8_t)buff[1] + (uint8_t)buff[2] + (uint8_t)buff [3];
        uint8_t crc_exp = (uint8_t)buff[4];
        if (crc_act != crc_exp) {
            LLOGD("DATA12 DATA crc not ok");
            lua_pushboolean(L, 0);
            return 1;
        }
        lua_pushboolean(L, 1);
        lua_pushinteger(L, (uint8_t)buff[0] * 10 + (uint8_t)buff[1]);
        if (((uint8_t)buff[2]) > 127)
            lua_pushinteger(L, ((uint8_t)buff[2] - 128) * -10 + (uint8_t)buff[3]);
        else
            lua_pushinteger(L, (uint8_t)buff[2] * 10 + (uint8_t)buff[3]);
        return 3;
    }
}

#include "rotable.h"
static const rotable_Reg reg_i2c[] =
{
    { "exist", l_i2c_exist, 0},
    { "setup", l_i2c_setup, 0},
    { "send", l_i2c_send, 0},
    { "recv", l_i2c_recv, 0},
    { "writeReg", l_i2c_write_reg, 0},
    { "readReg", l_i2c_read_reg, 0},
    { "close", l_i2c_close, 0},

    { "readDHT12", l_i2c_readDHT12, 0},

    { "FAST",  NULL, 1},
    { "SLOW",  NULL, 0},
	{ NULL, NULL, 0}
};

LUAMOD_API int luaopen_i2c( lua_State *L ) {
    rotable_newlib(L, reg_i2c);
    return 1;
}