本文來源電子發燒友社區，作者：華仔stm32， 帖子地址：https://bbs.elecfans.com/jishu_2293777_1_1.html

官方提供的是AT命令格式，但是我原來想象的還是用模塊本身獲取數據然后上傳給AP，這次仔細閱讀了官方的源代碼，at代碼在PS目錄下面，的at目錄下面，主要有at_boot.c、at_factory.c、at_wiota.c、at_wiota.h、at_wiota_atuto_manager.c、ati_prs.h文件。

在at_factory.c下面給出了示例，可以學習如何操作：

#ifdef UC8288_MODULE
#ifdef UC8288_FACTORY
#ifdef *RT_THREAD*
#include 
#include 
#endif
#include 
#include "uc_adda.h"
#include "string.h"
#include "ati_prs.h"
#include "at.h"
#ifdef *L1_FACTORY_FUNC*
#include "uc_wiota_api.h"
#endif

enum factory_can_write_read_type

{

FACTORY_CAN_WRITE = 0,

FACTORY_CAN_READ,

};

enum factory_command_type

{

FACTORY_WIOTA = 0,

FACTORY_GPIO, // 1

FACTORY_I2C,// 2

FACTORY_AD,// 3

FACTORY_DA,// 4

FACTORY_UART1,//5

FACTORY_PWM, // 6

FACTORY_CAN,

};

#define DAC_DEV_NAME                      "dac"

#define ADC_DEV_NAME                      "adc"

#define AHT10_I2C_BUS_NAME          "hw_i2c"

#define UART1_DEV_NMAE                  "uart1"

#define PWM_DEV_NAME                     "pwm0"

#define CAN_DEV_NAME                       "can1"

#define AT24C02_ADDR                         0xA0

static rt_err_t write_reg(struct rt_i2c_bus_device *bus, rt_uint8_t reg, rt_uint8_t *data)

{

rt_uint8_t buf[8];

struct rt_i2c_msg msgs;

rt_uint32_t buf_size = 1;


buf[0] = reg; //cmd
if (data != RT_NULL)
{
    buf[1] = data[0];
    buf[2] = data[1];
    buf[3] = data[2];
    buf[4] = data[3];
    buf_size = 5;
}

msgs.addr = AT24C02_ADDR;
msgs.flags = RT_I2C_WR;
msgs.buf = buf;
msgs.len = buf_size;

if (rt_i2c_transfer(bus, &msgs, 1) == 1)
{
    return RT_EOK;
}
else
{
    return -RT_ERROR;
}


}

static rt_err_t read_regs(struct rt_i2c_bus_device *bus, rt_uint8_t len, rt_uint8_t *buf)

{

struct rt_i2c_msg msgs;


msgs.addr = AT24C02_ADDR;
msgs.flags = RT_I2C_RD;
msgs.buf = buf;
msgs.len = len;

if (rt_i2c_transfer(bus, &msgs, 1) == 1)
{
    return RT_EOK;
}
else
{
    return -RT_ERROR;
}


}

static int at_test_i2c(void)

{

rt_device_t dev;

unsigned char set_data[4] = {1,2,3,4};

unsigned char get_data[4] = {0};

int num = 0;


dev = rt_device_find(AHT10_I2C_BUS_NAME);
if(RT_NULL == dev)
{
    rt_kprintf("rt_device_find i2c fail
");
    return 1;
}

if(RT_EOK != write_reg((struct rt_i2c_bus_device*)dev, 0, set_data))
{
    rt_kprintf("write_reg i2c fail
");
    return 2;
}

if(RT_EOK != read_regs((struct rt_i2c_bus_device*)dev, 4, get_data))
{
    rt_kprintf("read_regs i2c fail
");
    return 3;
}

for(num = 0; num < 4; num++)
{
    if (set_data[num] != get_data[num])
    {
        rt_kprintf("i2c data match fail. num=%d, %d!= %d
", num, set_data[num], get_data[num]);
        return 4;
    }
}
    
return 0;

}

static int at_test_ad(unsigned int channel)

{

rt_adc_device_t adc_dev;

rt_uint32_t value;


adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);
if (RT_NULL == adc_dev)
{
    rt_kprintf("ad find %s  fail
", ADC_DEV_NAME);
    return -1;
}

rt_adc_enable(adc_dev, channel);

value = rt_adc_read(adc_dev, channel);

rt_adc_disable(adc_dev, channel);

return value;


}

static int at_test_da(unsigned int channel, unsigned int value)

{

rt_dac_device_t dac_dev;


dac_dev = (rt_dac_device_t)rt_device_find(DAC_DEV_NAME);
if (RT_NULL == dac_dev)
{
    rt_kprintf("da find fail
");
    return -1;
}

rt_dac_enable(dac_dev, channel);

rt_dac_write(dac_dev, channel, value);

//rt_dac_disable(dac_dev, channel);

return 0;


}

static int at_factory_test_uart1(void)

{

static rt_device_t serial;

unsigned char send_data[4] = {"1234"};

unsigned char recv_data[4] = {0};


serial = rt_device_find(UART1_DEV_NMAE);
if (serial)
    return 1;

if ( RT_EOK != rt_device_open(serial, RT_DEVICE_OFLAG_RDWR))
{
    rt_kprintf("uart open fail
");
    return 2;
}

rt_device_write(serial, 0, send_data, sizeof(send_data)/sizeof(unsigned char));

if(rt_device_read(serial, 0, recv_data, sizeof(recv_data)/sizeof(unsigned char)) < 1)
{
    rt_kprintf("uart read fail
");
    return 3;
}

rt_device_close(serial);

return strcmp((const char *)send_data, (const char *)recv_data);


}

static int at_factory_test_pwm(int channel, unsigned int period)

{

struct rt_device_pwm *pwm_dev;

pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME);
if (RT_NULL == pwm_dev)
{
    return 1;
}

rt_pwm_set(pwm_dev, channel, period, 0);
rt_pwm_enable(pwm_dev, channel);
rt_pwm_disable(pwm_dev,channel);

return 0;

}

static int at_factory_test_can(int type, void *data)

{

static rt_device_t can_dev;

struct rt_can_msg msg = {0};

//struct rt_can_msg rxmsg = {0};

rt_err_t res;

rt_size_t  size;

can_dev = rt_device_find(CAN_DEV_NAME);
if (RT_NULL == can_dev)
{
    rt_kprintf("find %s failed!
", CAN_DEV_NAME);
    return 1;
}
res = rt_device_open(can_dev, RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_INT_RX);
if(res != RT_EOK)
{
     rt_kprintf("open %s failed!
", CAN_DEV_NAME);
    return 2;
}

if (type == FACTORY_CAN_WRITE)
{
    msg.id = 0x78;            
    msg.ide = RT_CAN_STDID;    
    msg.rtr = RT_CAN_DTR;     
    msg.len = 8;             

    msg.data[0] = 0x00;
    msg.data[1] = 0x11;
    msg.data[2] = 0x22;
    msg.data[3] = 0x33;
    msg.data[4] = 0x44;
    msg.data[5] = 0x55;
    msg.data[6] = 0x66;
    msg.data[7] = 0x77;

    size = rt_device_write(can_dev, 0, &msg, sizeof(msg.data));
    if (size == 0)
    {
        return 2;
    }
 }
else if (type == FACTORY_CAN_READ)
{
    int len = 0;
    //rxmsg.hdr = -1;
    rt_device_read(can_dev, 0, data, 8);
    rt_kprintf("recv data:");
    for(len = 0; len < 8; len++)
    {
        rt_kprintf("%x", *((int*)(data+len)));
    }
    rt_kprintf("
");
}

return 0;

}

static at_result_t at_factory_setup(const char* args)

{

int type = 0, data = 0, data1 = 0;

args = parse ((char*)(++args),"ddd", &type, &data, &data1);
 if (!args)
 {
     return AT_RESULT_PARSE_FAILE;
 }

rt_kprintf("type = %d,data=%d,data1 = %d
",  type, data, data1);
switch(type)
{
    case FACTORY_WIOTA:
    {

#ifdef *L1_FACTORY_FUNC*

if(!factory_msg_handler(data,data1)) {

return AT_RESULT_FAILE;

}

#endif

break;

}

case FACTORY_GPIO:

{

rt_base_t pin = data;

rt_base_t value = data1 & 0x1;

rt_pin_write( pin, value);            
        break;
    }
    case FACTORY_I2C:
    {
        if (at_test_i2c())
            return AT_RESULT_FAILE;
        break;
    }
    case FACTORY_AD:
    {
        unsigned int ch = data;
        int result = at_test_ad(ch);            
        if (result < 0)
              return AT_RESULT_NULL;  

        switch(ch)
        {
            case ADC_CONFIG_CHANNEL_TEMP_B:
            {
                float val = 0.00;
                val = (float)((float)1.42/4.0 + (result - 2048)* (float)1.42/2048.0/8.0);
                at_server_printfln("+FACTORY=%d,0.%d", type, val*100.0);
                break;
            }
            default:
            {
                at_server_printfln("+FACTORY=%d,%d", type, result);
                break;
             }
        }
        
        break;
    }
    case FACTORY_DA:
    {
        unsigned int ch = data;
        unsigned int val = data1;
        if(at_test_da(ch, val) < 0)
            return AT_RESULT_NULL;
        break;
    }
    case FACTORY_UART1:
    {
        if(at_factory_test_uart1())
             return AT_RESULT_NULL;
        break;
    }
    case FACTORY_PWM:
    {
        int channel = data;
        unsigned int period = data1;
        
        if (at_factory_test_pwm( channel, period))
            return AT_RESULT_NULL;
        break;
     }
    case FACTORY_CAN:
    {
        char recv[8] = {0};
        if (at_factory_test_can(data, recv))
            return AT_RESULT_NULL;
        
        if (data == FACTORY_CAN_READ)
        {
            at_server_printf("+FACTORY=%d,", type);
            at_send_data(recv, sizeof(recv)/sizeof(recv[0]));
        }
        
        break;
    }
    default:
        return AT_RESULT_REPETITIVE_FAILE;
}

return AT_RESULT_OK;

}

AT_CMD_EXPORT("AT+FACTORY", "=,,", RT_NULL, RT_NULL, at_factory_setup, RT_NULL);

#endif

#endif