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serial.c
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serial.c
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/**
* Serial library for dsPIC.
*
* Wiring:
* |-------------------------------------------------|
* | FTDI dsPIC33 |
* |-------------------------------------------------|
* | GND -- GND (pin 8) |
* | VCC -- VCC (pin 13) (not needed/for power) |
* | TX -> RX (pin 15) |
* | RX <- TX (pin 16) |
* |-------------------------------------------------|
*
* Inspired by:
* http://solar-blogg.blogspot.dk/2009/08/uart-example-for-dspic33.html
* Thank you very much!
*/
#include <xc.h>
#include <stdint.h>
#include <string.h>
/**
* Set up UART.
*/
void serial_init()
{
TRISBbits.TRISB7 = 0; // TX = RP7
RPOR3bits.RP7R = 0b00011;
TRISBbits.TRISB6 = 1; // RX = RP6
RPINR18bits.U1RXR = 6;
U1MODE = 0x0000;
U1BRG = 239; // Clock divisor
U1STA = 0x0000;
U1MODEbits.UARTEN = 1;
U1STAbits.UTXEN = 1;
}
/**
* Transmit a byte over UART.
*
* \param byte Byte to transmit.
* \todo Read a "finish" flag instead of delay.
*/
void serial_writebyte(uint8_t byte)
{
while (U1STAbits.UTXBF); // Wait if buffer full.
U1TXREG = byte;
}
/**
* Transmit a string, followed by a newline, over UART.
*
* \param str String to transmit.
*/
void serial_writeln(uint8_t *str)
{
int i;
for (i = 0; i < strlen(str); i++) {
serial_writebyte(str[i]);
}
serial_writebyte('\n');
}