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wifi_serial.c
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wifi_serial.c
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//wifi serial
void serial_init()
{
//USART 1 - wifi module
TXSTA1bits.SYNC = 0;
TXSTA1bits.BRGH = 1;
TXSTA1bits.TX9 = 0;
TXSTA1bits.TXEN = 1;
RCSTA1bits.SPEN = 1;
RCSTA1bits.RX9 = 0;
// SPBRG1 = 0x08; //115200 baud rate
// SPBRGH1 = 0x00; //115200 baud rate
SPBRG1 = 0x33; //19200 baud rate
SPBRGH1 = 0x00; //19200 baud rate
// SPBRG1 = 0x0C; //74880 baud rate
// SPBRGH1 = 0x00; //74880 baud rate
//USART 2 - Printer
TXSTA2bits.SYNC = 0;
TXSTA2bits.BRGH = 1;
TXSTA2bits.TX9 = 0;
TXSTA2bits.TXEN = 1;
RCSTA2bits.SPEN = 1;
RCSTA2bits.RX9 = 0;
SPBRG2 = 0x33; //19200 baud rate
SPBRGH2 = 0x00; //19200 baud rate
}
void wifi_acknowledge()
{
char buffer = 'a';
RCSTA1bits.CREN = 1;
while (buffer != 'K') //wait for connection acknowledgment
{
while (!PIR1bits.RC1IF);
buffer = RCREG1;
}
RCSTA1bits.CREN = 0;
}
//connect to AP
int wifi_connect()
{
char buffer = 'a';
char buffer2 = 'a';
send_command(0x01); //clear display
send_string(connect, 13);
delay();
fprintf(_H_USART, "AT+CWJAP=\"<NETWORK ID>\",\"<PASSWORD>\"\r\n");
RCSTA1bits.CREN = 1; //enable receive
//ESP replies with "OK" upon success, so I only look for the first 'K' (my home network doesn't have a 'K', will improve in the future)
while (buffer != 'K') //wait for connection acknowledgment
{
while (!PIR1bits.RC1IF);
buffer = RCREG1;
}
RCSTA1bits.CREN = 0;
return 1;
}
//start communication with OpenWeatherMap
void weather_start()
{
fprintf(_H_USART, "AT+CIPSTART=\"TCP\",\"api.openweathermap.org\",80\r\n");
wifi_acknowledge(); //wait for connection acknowledgment
fprintf(_H_USART, "AT+CIPSEND=127\r\n");
wifi_acknowledge(); //wait for connection acknowledgment
fprintf(_H_USART, "GET /data/2.5/find?q=Saskatoon&units=metric&appid=<APP ID> HTTP/1.0\r\nHost: api.openweathermap.org\r\n\r\n\r\n");
}
//start communication with wordnik
void word_start()
{
fprintf(_H_USART, "AT+CIPSTART=\"TCP\",\"api.wordnik.com\",80\r\n");
wifi_acknowledge(); //wait for connection acknowledgment
fprintf(_H_USART, "AT+CIPSEND=127\r\n");
wifi_acknowledge(); //wait for connection acknowledgment
fprintf(_H_USART, "GET /v4/words.json/wordOfTheDay?api_key=<API KEY> HTTP/1.0\r\nHost: api.wordnik.com\r\n\r\n\r\n");
//the above GET request was 127 bytes long including my API KEY
}
void wifi_close() //ended up not using this
{
fprintf(_H_USART, "AT+CIPSEND=127\r\n");
wifi_acknowledge(); //wait for connection acknowledgment
}
//skips all header and meta data
void wifi_skip_data()
{
char buffer1;
buffer1 = 'a';
while (buffer1 != '{') //skip to the start of the JSON data
{
while (!PIR1bits.RC1IF);
buffer1 = RCREG1;
}
}
//**********************************************************************************************
void temp_read(char temp[])
{
int i,j;
char buffer1, buffer2, buffer3;
//wait for '{' to appear 3 times
while (buffer1 != '{')
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
while (buffer2 != '{')
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer2 = RCREG1;
}
while (buffer3 != '{')
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer3 = RCREG1;
}
//skip next 7 characters
for (i = 0; i < 7; i++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
//record word until , appears
for (j = 0; j < 10; j++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer2 = RCREG1;
if (buffer2 == ',')
{
return;
}
temp[j] = buffer2;
}
}
void wind_read(char wind[])
{
int i,j;
char buffer1, buffer2;
//wait for 'w' to appear
while (buffer1 != 'w')
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
//skip next 14 characters
for (i = 0; i < 14; i++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
//record word until , appears
for (j = 0; j < 10; j++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer2 = RCREG1;
if (buffer2 == ',')
{
return;
}
wind[j] = buffer2;
}
}
//**********************************************************************************************
void word_read(char word[])
{
int i,j;
char buffer1, buffer2;
//wait for 'w' to appear
while (buffer1 != 'w')
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
//skip next 6 characters
for (i = 0; i < 6; i++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
//record word until " appears
for (j = 0; j < 10; j++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer2 = RCREG1;
if (buffer2 == '"')
{
return;
}
word[j] = buffer2;
}
}
void definition_read(char definition[])
{
int i,j;
char buffer1, buffer2;
//wait for '[' to appear twice
while (buffer1 != '[')
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
while (buffer2 != '[')
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer2 = RCREG1;
}
//skip next 9 characters
for (i = 0; i < 9; i++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
//record word until " appears
for (j = 0; j < 255; j++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer2 = RCREG1;
if (buffer2 == '"')
{
return;
}
definition[j] = buffer2;
}
}
void partOfSpeech_read(char partOfSpeech[])
{
int i,j;
char buffer1, buffer2, buffer3;
//skip next 17 characters
for (i = 0; i < 17; i++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer1 = RCREG1;
}
//record word until " appears
for (j = 0; j < 30; j++)
{
while (!PIR1bits.RC1IF)
{
Nop();
}
buffer3 = RCREG1;
if (buffer3 == '"')
{
return;
}
partOfSpeech[j] = buffer3;
}
}