——來自迪文開發者論壇
本期為大家推送迪文開發者論壇獲獎開源案例——智能培養室。工程師通過Modbus協議實現了T5L智能屏控制加熱、風機控溫功能，還可調節電源功率實現模擬光照功能。系統可根據屏幕上設定的參數自動運行，并保存故障歷史記錄。

UI素材展示 ?

UI開發示例 C51代碼設計

（1）主界面溫度、濕度、高度等數據獲取和更新，以及使用modbus rtu控制控溫模塊、電機、報警檢測等各個從機的主要代碼如下：

主界面代碼參考：

#include "main_win.h"#include "modbus.h"#include "sys_params.h"

#include "func_handler.h"

#include "uart2.h"#include #include #define TEMP_HUM_SLAVE_ADDR 2#define TEMP_HUM_VAL_MAX_NUM 2

#define ALERT_BIT_MAX_NUM 30

#define ALERT_BYTE_NUM (ALERT_BIT_MAX_NUM/8+((ALERT_BIT_MAX_NUM%8)!=0))#define GET_ALERT_BIT(val, pos) ((val[pos/8]>>(pos%8))&0x01)typedef struct{ char date[17]; u8 desc;}ALERT;#defineALERT_TABLE_LEN

20static u8 btn_sta[MAIN_WIN_BTN_MAX_NUM] = {0};static u8 btn_addr[MAIN_WIN_BTN_MAX_NUM] = {50, 51, 52, 69, 53, 54, 55, 70, 56, 57, 58, 59};u16 main_win_val[MAIN_WIN_VAL_MAX_NUM];u16 temp_hum_val[TEMP_HUM_VAL_MAX_NUM] = {0};u16 date_val[MAIN_WIN_DATE_MAX_NUM] = {0};u8

alert_val[ALERT_BYTE_NUM] = {0};u8 old_alert_val[ALERT_BYTE_NUM] = {0};ALERT alert_table[ALERT_TABLE_LEN];u16 alert_num = 0;bit is_main_win = 0;void main_win_update(){}void main_win_disp_date()

{ u8 len; len = sprintf(common_buf,"%u:%u", (u16)date_val[3], (u16)date_val[4]); common_buf[len+1] = 0; sys_write_vp(MAIN_WIN_DATE_VP, common_buf,

len/2+2);}void main_win_process_alert()

{ u8 i; for(i=0;i { if(GET_ALERT_BIT(old_alert_val, i)) continue;

if(GET_ALERT_BIT(alert_val, i)) { if(alert_num>=ALERT_TABLE_LEN) alert_num = ALERT_TABLE_LEN-1;

alert_table[alert_num].desc = i+1; sprintf(alert_table[alert_num].date, "%u/%u/%u %u:%u", date_val[0], date_val[1],

date_val[2], date_val[3], date_val[4] ); alert_num++; } }

memcpy(old_alert_val, alert_val, sizeof(alert_val));}void main_win_disp_alert(){ u16 i; u16 val; u16 len = 0; common_buf[0] = 0; for(i=0;i { val = 0; if(i { val = alert_table.desc; len += sprintf(common_buf+len, "%s\r\n", alert_table.date); } sys_write_vp(ALERT_WIN_DESC_START_VP+i, (u8*)&val, 1); }

common_buf[len+1] = 0; sys_write_vp(ALERT_WIN_DATE_VP, common_buf, len/2+2);}void main_win_init(){ float fixed_val; u8 i; is_main_win = 1;
main_win_val[5] = (u16)(temp_hum_val[0]/10.0+0.5f); main_win_val[6] = (u16)(temp_hum_val[1]/10.0+0.5f); for(i=0;i { if(i==0) continue;sys_write_vp(MAIN_WIN_WIND_SPEED_VP+MAIN_WIN_VAL_OFFSET*i, (u8*)&main_win_val, 1); } fixed_val = main_win_val[0]/WIND_SPEED_SCALE+FLOAT_FIX_VAL; sys_write_vp(MAIN_WIN_WIND_SPEED_VP, (u8*)&fixed_val, 2);}void main_win_click_handler(u16 btn_val){ u8 index; if(btn_val==0x0B) { main_win_disp_alert(); return; } index = btn_val-1; btn_sta[index] = !btn_sta[index];

if((index==3)||(index==7)) btn_sta[index] = 1; modbus_write_bit(btn_addr[index], btn_sta[index]?0xFF00:0x0000); btn_val = btn_sta[index];sys_write_vp(MAIN_WIN_BTN_STA_START_VP+MAIN_WIN_BTN_STA_OFFSET*index, (u8*)&btn_val, 1); if(index==9) is_main_win = 0; else if((index==3)||(index==7)) { while(sys_get_touch_sta()); modbus_write_bit(btn_addr[index], 0x0000); }}

void main_win_msg_handler(u8 *msg,u16 msg_len){ u8 f_code = msg[MODBUS_RESPOND_POS_FUNC_CODE];

u8 data_len = msg[MODBUS_RESPOND_POS_DATA_LEN]; u8 i; u8 offset; msg_len = msg_len; if(!is_main_win) return;if((f_code==MODBUS_FUNC_CODE_03)&&(data_len==MAIN_WIN_VAL_MAX_NUM*2)) { offset = MODBUS_RESPOND_POS_DATA; for(i=0;i { main_win_val = SYS_GET_U16(msg[offset], msg[offset+1]); offset += 2; } main_win_update(); }

else if((f_code==MODBUS_FUNC_CODE_01)&&(data_len==ALERT_BYTE_NUM)) { offset = MODBUS_RESPOND_POS_DATA; for(i=0;i { alert_val = msg[offset]; offset++; }

main_win_process_alert(); }else if((f_code==MODBUS_FUNC_CODE_03)&&(data_len==TEMP_HUM_VAL_MAX_NUM*2))

{ offset = MODBUS_RESPOND_POS_DATA; for(i=0;i { temp_hum_val = SYS_GET_U16(msg[offset], msg[offset+1]);

offset += 2; modbus_write_word(5+i, temp_hum_val); } main_win_update(); }else if((f_code==MODBUS_FUNC_CODE_03)&&(data_len==MAIN_WIN_DATE_MAX_NUM*2)) { offset = MODBUS_RESPOND_POS_DATA; for(i=0;i { date_val = SYS_GET_U16(msg[offset], msg[offset+1]); offset += 2; } main_win_disp_date(); }}void main_win_read_temp_hum(){ u8 old_slave_addr = SLAVE_ADDR; sys_params.user_config[5] = TEMP_HUM_SLAVE_ADDR; modbus_read_words(0, TEMP_HUM_VAL_MAX_NUM); sys_params.user_config[5] = old_slave_addr;//還原}void main_win_handler(){ static u8 flag = 0; if(is_main_win) { if(alert_read_period==ALERT_READ_PERIOD) { alert_read_period = 0; modbus_read_bits(510, ALERT_BIT_MAX_NUM); return; } if(date_update_period==DATE_UPDATE_PERIOD) { date_update_period = 0; modbus_read_words(180, MAIN_WIN_DATE_MAX_NUM); return; } flag = !flag; if(flag) modbus_read_words(0, MAIN_WIN_VAL_MAX_NUM); else main_win_read_temp_hum(); }}

modbus rtu代碼參考：

#include "modbus.h"#include "crc16.h"#include "sys_params.h"#define UART_INCLUDE "uart2.h"#define UART_INIT uart2_init#define UART_SEND_BYTES uart2_send_bytes#define UART_BAUD 9600#define MODBUS_RECV_TIMEOUT (u8)(35000.0f/UART_BAUD+2)#define MODBUS_SEND_INTERVAL 150#include UART_INCLUDEstatic bit is_modbus_recv_complete = 0;static u8 modbus_recv_buff[270];

static u16 modbus_recv_len = 0;//接受的總字節長度

static u8 modbus_recv_timeout = 0;//接受溢出時間static volatile u16 modbus_send_interval = 0;MODBUS_PACKET packet;void modbus_init()

{ UART_INIT(UART_BAUD);}void modbus_send_bytes(u8 *bytes,u16 len){ UART_SEND_BYTES(bytes,len);}

void modbus_recv_byte(u8 byte){ if(is_modbus_recv_complete) return; if(modbus_recv_len

{ modbus_recv_timeout--; if(modbus_recv_timeout==0)

{ is_modbus_recv_complete = 1; } }}

u8 modbus_send_packet(u8 *packet)

{ u16 len; u16 crc; u8 func_code = packet[1]; while(modbus_send_interval); if(func_code==MODBUS_FUNC_CODE_10) { ((MODBUS_10_PACKET*)packet)->byte_num = ((MODBUS_10_PACKET*)packet)->word_num*2; len = 9+((MODBUS_10_PACKET*)packet)->byte_num; }

else if(func_code==MODBUS_FUNC_CODE_0F) { len = ((MODBUS_0F_PACKET*)packet)->bit_num;

((MODBUS_0F_PACKET*)packet)->byte_num = len/8+(len%8?1:0);

len = 9+((MODBUS_0F_PACKET*)packet)->byte_num; }else { len = sizeof(MODBUS_PACKET); } crc = crc16(packet,len-2);

packet[len-2] = (u8)(crc>>8); packet[len-1] = (u8)crc; modbus_send_bytes(packet,len); modbus_send_interval = MODBUS_SEND_INTERVAL; return 0;//成功}extern void modbus_msg_handler(u8 *msg,u16 msg_len);void modbus_handler(){ u16 crc; if(!is_modbus_recv_complete) return; //校驗crc值

crc = ((u16)modbus_recv_buff[modbus_recv_len-2]<<8)+modbus_recv_buff[modbus_recv_len-1]; if(crc16(modbus_recv_buff,modbus_recv_len-2)==crc) { modbus_msg_handler(modbus_recv_buff,modbus_recv_len); } modbus_recv_len = 0; is_modbus_recv_complete = 0; }u8 modbus_send_fcode(u8 fcode, u16 addr, u16 len){ packet.slave_addr = SLAVE_ADDR; packet.func_code = fcode;//功能碼?

packet.start_addr = addr;//地址 packet.data_len = len;//寫入的值 len = modbus_send_packet((u8*)&packet); return len;}