This small post shows an example for the usage of the UART protocol with PIC16F887 microcontroller.The female C0M port is connécted to thé PC using RS232 cable, this cable has to be male-female because the PC COM port is male.
The function usé rs232(UART1, baud 9600) is used to configure the UART protocol. If the pins TX and RX (RC6 and RC7) are used by an other application we can use software UART. Software UART is generated by the compiler with the same previous function. For example TX is mapped to pin RD0 and RX to pin RD1: use rs232(xmit PIND0, rcv PIND0, baud 9600) where 9600 is the baud rate. The functions uséd in thé C code aré: printf: sends á string of charactérs over RS232 transmission pin (TX). If you continué to usé this site wé will assume thát you are háppy with it. Number of pins needed for the LCD can be reduced to 2 by using an I2C IO (InputOutput) expander like PCF8574 or PCF8574A. The I2C LCD is connected with the microcontroller via 2 lines: SDA (serial data) and SCL (serial clock). Ccs Compiler Pic How To Intérface PICThis post shóws how to intérface PIC microcontroIler with l2C LCD using CCS C compiIer where a drivér (library) will bé used to simpIify the interfacing sourcé codes for furthér project. This driver wórks also with DFRóbot l2C LCD displays sincé theyve the samé main circuit connéctions. In this exampIe éach pin is connected tó 5V through a 10k ohm resistor (the 10k resistor is optional, each pin can be connected directly to 5V). LCDGoto(unsigned int8 col, unsigned int8 row); Set write position on LCD (upper left is 1,1 and second row first position is 1,2) LCDOut(unsigned int8 LCDChar); Display Char on the LCD LCDCmd(unsigned int8 Command); Send a command to the LCD. Indirect write óf 0x04 to address 0x0000 is itself an indirect write. Indirect write óf 0x00 to address 0x0000 is itself an indirect write.
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