//-----------------------------------------------------------------------------
// F06x_UART1_Interrupt.c
//-----------------------------------------------------------------------------
// Copyright 2006 Silicon Laboratories, Inc.
// http://www.silabs.com
//
// Program Description:
//
// This program demonstrates how to configure the C8051F060 to write to and read
// from the UART interface. The program reads a word using the UART1 interrupts
// and outputs that word to the screen, with all characters in uppercase
//
// How To Test:
//
// 1) Download code to a 'F060 target board
// 2) Connect serial cable from the transceiver to a PC
// 3) On the PC, open HyperTerminal (or any other terminal program) and connect
// to the COM port at <BAUDRATE> and 8-N-1
// 4) Type up to 64 characters into the Terminal and press Enter. The MCU
// will then print back the characters that were typed
//
//
// Target: C8051F06x
// Tool chain: Keil C51 7.50 / Keil EVAL C51
// Command Line: None
//
// Release 1.0
// -Initial Revision (SM)
// -6 JUN 2007
//
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <C8051F060.h> // SFR declarations
#include <stdio.h>
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F06x
//-----------------------------------------------------------------------------
sfr16 RCAP2 = 0xCA; // Timer2 capture/reload
sfr16 TMR2 = 0xCC; // Timer2
//-----------------------------------------------------------------------------
// Global Constants
//-----------------------------------------------------------------------------
#define BAUDRATE 115200 // Baud rate of UART in bps
// SYSTEMCLOCK = System clock frequency in Hz
#define SYSTEMCLOCK 22118400L
//-----------------------------------------------------------------------------
// Function Prototypes
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void);
void PORT_Init (void);
void UART1_Init (void);
//-----------------------------------------------------------------------------
// Global Variables
//-----------------------------------------------------------------------------
#define UART_BUFFERSIZE 64
unsigned char UART_Buffer[UART_BUFFERSIZE];
unsigned char UART_Buffer_Size = 0;
unsigned char UART_Input_First = 0;
unsigned char UART_Output_First = 0;
unsigned char TX_Ready =1;
static char Byte;
//-----------------------------------------------------------------------------
// main() Routine
//-----------------------------------------------------------------------------
void main (void)
{
SFRPAGE = CONFIG_PAGE;
WDTCN = 0xDE; // Disable watchdog timer
WDTCN = 0xAD;
OSCILLATOR_Init (); // Initialize oscillator
PORT_Init (); // Initialize crossbar and GPIO
UART1_Init (); // Initialize UART1
EA = 1;
SFRPAGE = UART1_PAGE;
while (1)
{ // If the complete word has been entered via the terminal followed
// by carriage return
if((TX_Ready == 1) && (UART_Buffer_Size != 0) && (Byte == 13))
{
TX_Ready = 0; // Set the flag to zero
TI1 = 1; // Set transmit flag to 1
}
}
}
//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// OSCILLATOR_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// This function initializes the system clock to use an external 22.1184MHz
// crystal.
//
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void)
{
int i; // Software timer
char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page
SFRPAGE = CONFIG_PAGE; // Set SFR page
OSCICN = 0x80; // Set internal oscillator to run
// at its slowest frequency
CLKSEL = 0x00; // Select the internal osc. as
// the SYSTEMCLOCK source
// Initialize external crystal oscillator to use 22.1184 MHz crystal
OSCXCN = 0x67; // Enable external crystal osc.
for (i=0; i < 256; i++); // Wait at least 1ms
while (!(OSCXCN & 0x80)); // Wait for crystal osc to settle
CLKSEL = 0x01;
// Select external crystal as SYSTEMCLOCK source
SFRPAGE = SFRPAGE_SAVE; // Restore SFRPAGE
}
//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// This function configures the crossbar and GPIO ports.
//
// Pinout:
//
// P0.0 digital push-pull UART TX
// P0.1 digital open-drain UART RX
//-----------------------------------------------------------------------------
void PORT_Init (void)
{
char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page
SFRPAGE = CONFIG_PAGE; // Set SFR page
XBR0 = 0x00;
XBR1 = 0x00;
XBR2 = 0x44; // Enable crossbar and weak pull-up
// Enable UART1
P0MDOUT |= 0x01; // Set TX pin to push-pull
SFRPAGE = SFRPAGE_SAVE; // Restore SFR page
}
//-----------------------------------------------------------------------------
// UART1_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// Configure the UART1 using Timer1, for <BAUDRATE> and 8-N-1.
//
//-----------------------------------------------------------------------------
void UART1_Init (void)
{
char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page
SFRPAGE = UART1_PAGE;
SCON1 = 0x10; // SCON1: mode 0, 8-bit UART, enable RX
SFRPAGE = TIMER01_PAGE;
TMOD &= ~0xF0;
TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit reload
if (SYSTEMCLOCK/BAUDRATE/2/256 < 1) {
TH1 = -(SYSTEMCLOCK/BAUDRATE/2);
CKCON |= 0x10; // T1M = 1; SCA1:0 = xx
} else if (SYSTEMCLOCK/BAUDRATE/2/256 < 4) {
TH1 = -(SYSTEMCLOCK/BAUDRATE/2/4);
CKCON &= ~0x13; // Clear all T1 related bits
CKCON |= 0x01; // T1M = 0; SCA1:0 = 01
} else if (SYSTEMCLOCK/BAUDRATE/2/256 < 12) {
TH1 = -(SYSTEMCLOCK/BAUDRATE/2/12);
CKCON &= ~0x13; // T1M = 0; SCA1:0 = 00
} else {
TH1 = -(SYSTEMCLOCK/BAUDRATE/2/48);
CKCON &= ~0x13; // Clear all T1 related bits
CKCON |= 0x02; // T1M = 0; SCA1:0 = 10
}
TL1 = TH1; // init Timer1
TR1 = 1; // START Timer1
TX_Ready = 1; // Flag showing that UART can transmit
EIE2 = 0x40; // Enable UART1 interrupts
SFRPAGE = UART1_PAGE;
EIP2 = 0x40; // Make UART high priority
SFRPAGE = SFRPAGE_SAVE; // Restore SFR page
}
//----------------------------------------
