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R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 Source Codes for DRA818U/DRA818V V1.01 This document contains source codes for high power wireless voice transceiver module DRA818U/DRA818V and is used only for reference. In order to understand the codes better, users also can refer to the document ADW1011_configure_DRA818V_DRA818U_through_computer for details.

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016

Description

DRA818U/DRA818V modules use standard UART interface to communic ate with the host. The default data format is: 9600 8 N 1 ( 9.6k bps baud rate, 8-bit data, no parity check and 1 stop bit). Users can send AT commands to configure the parameters and the modules will give response when they receive correct AT commands. AT comannds: The AT commands are in ASCII format and ended with <CR><LF>. Num AT command Description Format AT+DMOCONNECT <CR><LF>

1 Handshake

Response +DMOCONNECT:0<CR><LF> Format AT+DMOSETGROUP=GBW,TFV, RFV,Tx_CTCSS,SQ,Rx_CTCSS<CR><LF>

2 Group Parameters

+DMOCONNECT: x<CR><LF> x=0:succeded x=1: data out of range Format S+Frequency <CR><LF>

3 Frequency Scan

S=x <CR><LF> x=0: found x=1: no frequency Format AT+DMOSETVOLUME=x <CR><LF>

4 Volume

+ DMOSETVOLUME: X<CR><LF> x=0:succeded x=1: failed Format AT+SETFILTER=PRE/DE-EMPH,Highpass,Lowpass <CR><LF>

5 Audio filter

+ DMOSETFILTER: x<CR><LF> x=0:succeded x=1: failed Format AT+SETTAIL=TAIL

6 Tone Tail

+DMOSETTAIL: X x=0:succeded x=1: failed Format RSSI? Read RSSI Response RSSI=X x: RSSI value (0~255) Table 1: AT Command List

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 Reference Codes The codes below are written for microcontroller type PIC1939 RAM DEFINE Const unsigned char CMD_HAND[15]={0x41,0x54,0x2B,0x44,0x4D,0x4F,0x43,0x4F,0x4E,0x4E,0x45,0x43,0x54,0x0d,0x0a}; unsigned char CMD_SET[15]={0x41,0x54,0x2b,0x44,0x4d,0x4f,0x53,0x45,0x54,0x47,0x52,0x4f,0x55,0x50,0x3d}; unsigned char CMD_VOLUME[16]={0x41,0x54,0x2B,0x44,0x4D,0x4F,0x53,0x45,0x54,0x56,0x4f,0x4c,0x55,0x4d,0x45,0x3d}; unsigned char tx_buf[50]={0}; unsigned char rx_buf[30]={0}; unsigned char tx_len; unsigned char rx_len; unsigned char len_txnow; unsigned char len_rxnow; unsigned char status_cnt = 2; v o i d u a r t _ i n i t ( ) // MCU UART Initialization SPBRGH = 0; SPBRG = 23; TXSTA = 0; RCSTA = 0x90; BAUDCON = 0; TXIE = 0; RCIE = 0;

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 v o i d c h e c k _ u a r t ( ) // send handshake instruction to module regularly to check the connection status of module unsigned char i; if(Flag.in_rx == 1) r x _ cnt --; if(rx_cnt == 0) Flag.in_rx = 0; Flag.in_tx = 0; Flag.cn_fail = 1; LED_CTCS = LED_OFF; Flag.poweron = 1; fresh_display(); return; if((Flag.in_tx == 1)||(Flag.in_rx == 1)) // No interleave sendi ng instruction, to ensure the module properly receiving instruction. return; send_hand(); v o i d u a r t _ t r a n s _ c h e c k ( v o i d ) // check if the transmitting instruction is complete or not if((Flag.in_tx == 1)&&(len_txnow > tx_len)&&(TXIF == 1))

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 stop_TX(); // Send is finished, close the sending UART function. Flag.in_tx = 0; Flag.in_rx = 1; rx_cnt = 2; len_txnow = 0; len_rxnow = 0; tx_len = 0; c l r _ t x _ b u f ( ) ; // Initializes the related registers and flags s t a r t _ R X ( ) ; // receiving function is available void uart_recv_ack(void) if(Flag.in_rx == 0) return; if(len_rxnow == rx_len) Flag.in_rx = 0; if((rx_buf[rx_len-3] == 0x30)&& (rx_buf[rx_len-2] == 0x0d)&&(rx_ b u f [ r x _ l e n - 1 ] = = 0 x 0 a ) ) // judge return instruction status_cnt = 2; Flag.cn_fail = 0; LED_CTCS = LED_ON; fresh_display();

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 stop_RX(); if((rx_len == 15)&&(Flag.poweron)) Flag.reset = 1; Flag.poweron = 0; return; else if(Flag.cn_fail == 1) return; e l s e status_cnt -= 1; i f ( s t a t u s _ c n t = = 0 ) // If the instruction returns null continuously, set the flag bit of module connection to failed Flag.cn_fail = 1; LED_CTCS = LED_OFF; Flag.poweron = 1; void send_hand() unsigned char i; for(i=0;i<=14;i++) t x _ b u f [ i ] = C M D _ H A N D [ i ] ;

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 // Load the handshake instruction rx_len = 15; t x _ l e n = 1 5 ; // Write handshake instruction to send and receive data bytes len_txnow = 0; Flag.in_tx = 1; c l r _ r x _ b u f ( ) ; // Clear the receive buffer s t a r t _ T X ( ) ; // send UART function is available void send_set() unsigned char i; for(i=0;i<=14;i++) t x _ b u f [ i ] = C M D _ S E T [ i ] ; tx_buf[15] = ASCII(Flag.gbw); tx_buf[16] = ASCII_comma; ASCII_TFV(); tx_buf[25] = ASCII_comma; ASCII_RFV(); tx_buf[34] = ASCII_comma; tx_buf[35] = ASCII(Tx_ctcs_3); tx_buf[36] = ASCII(Tx_ctcs_2); tx_buf[37] = ASCII(Tx_ctcs_1); tx_buf[38] = ASCII(Tx_ctcs_0); tx_buf[37] = ASCII_comma; tx_buf[38] = ASCII(sq);

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 tx_buf[39] = ASCII_comma; tx_buf[40] = ASCII(Rx_ctcs_3); tx_buf[41] = ASCII(Rx_ctcs_2); tx_buf[42] = ASCII(Rx_ctcs_1); tx_buf[43] = ASCII(Rx_ctcs_0); // Instruction of sending data are ASCII tx_buf[44] = 0x0d; t x _ b u f [ 4 5 ] = 0 x 0 a ; // Send instructions all ends with a carriage return line feed（0X0D,0X0A） rx_len = 16; t x _ l e n = 4 6 ; // Write handshake instruction to send and receive data bytes len_txnow = 0; Flag.in_tx = 1; clr_rx_buf(); start_TX(); void send_vol() unsigned char i; for(i=0;i<=15;i++) tx_buf[i] = CMD_VOLUME[i]; // load volume instruction tx_buf[16] = ASCII(vol); tx_buf[17] = 0x0d; tx_buf[18] = 0x0a; rx_len = 17; t x _ l e n = 1 9 ;

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 // write number of bytes to set the volume level to send and receive data len_txnow = 0; Flag.in_tx = 1; clr_rx_buf(); start_TX(); void clr_tx_buf() // Clear the send buffer unsigned char i; for(i=0;i<=39;i++) tx_buf[i]=0; v o i d c l r _ r x _ b u f ( ) // Clear the receive buffer unsigned char i; for(i=0;i<=18;i++) rx_buf[i] = 0; v o i d s t a r t _ T X ( ) // to make it send UART TXEN = 1; TXIE = 1;

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 v o i d s t o p _ T X ( ) // close UARTsending TXEN = 0; TXIE = 0; void start_RX() // to make it receive UART CREN = 1; RCIE = 1; v o i d s t o p _ R X ( ) // close UART receiving CREN = 0; RCIE = 0; void interrupt ISR_timer(void) // interrupt handling unsigned char int_temp; if(TXIF)

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 if(Flag.in_tx == 0) stop_TX(); // Not in delivery status, interrupted by mistake else if(len_txnow <= tx_len) TXREG = tx_buf[len_txnow]; // update sending data len_txnow ++; e l s e T X I E = 0 ; // send over if(RCIF) NOP(); if(Flag.in_rx) rx_buf[len_rxnow] = RCREG; // write the returned dato to receive buffer if((len_rxnow++) == (rx_len+1)) stop_RX(); e l s e // Not in receiving state, interrupted by mistake, invalid return values stop_RX(); int_temp = RCREG;

R e v i s i o n 1 . 0 1 P a g e o f 1 2 J a n . 2016 Dorji Applied Technologies A division of Dorji Industrial Group Co., Ltd Add.: Xinchenhuayuan 2, Dalangnanlu, Longhua, Baoan district, Shenzhen, China 518109 Tel: 0086-755-28156122 Fax.: 0086-755-28156133 Email: sales@dorji.com Web: http://www.dorji.com Dorji Industrial Group Co., Ltd reserves the right to make corrections, modifications, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers are expected to visit websites for getting newest product information before placing orders. These products are not designed for use in life support appliances, devices or other products where malfunction of these products might result in personal injury. Customers using these products in such applications do so at their own risk and agree to fully indemnify Dorji Industrial Group for any damages resulting from improper use.