📄 f06x_uarts_stdio_polled_2uarts.#2
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//-----------------------------------------------------------------------------
// F06x_UARTs_STDIO_Polled_2UARTs.c
//-----------------------------------------------------------------------------
// Copyright 2005 Silicon Laboratories, Inc.
// http://www.silabs.com
//
// Program Description:
//
// This program demonstrates configuration of UART0 and UART1 and includes
// an example of how to overload the STDIO library functions to enable
// selection of either UART0 or UART1 in code, via the "Uart" global variable.
//
//
// How To Test:
//
// 1) Download code to a 'F06x device that is connected to a UART transceiver
// 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) HyperTerminal will print a message if everything is working properly
//
//
// FID: 06X000031
// Target: C8051F06x
// Tool chain: KEIL C51 7.50 / KEIL EVAL C51
// Command Line: None
//
// Release 1.0
// -Initial Revision (BW / TP)
// -07 DEC 2006
//
//-----------------------------------------------------------------------------
// 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
// SYSCLK = System clock frequency in Hz
#define SYSCLK 22118400L
//-----------------------------------------------------------------------------
// Function Prototypes
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void);
void PORT_Init_UART0 (void);
void PORT_Init_UART1 (void);
void UART0_Init (void);
void UART1_Init (void);
//-----------------------------------------------------------------------------
// Global Variables
//-----------------------------------------------------------------------------
unsigned char Uart; // Global variable -- when '0', UART0
// is used for stdio; when '1', UART1
// is used for stdio
//-----------------------------------------------------------------------------
// main() Routine
//-----------------------------------------------------------------------------
void main (void)
{
SFRPAGE = CONFIG_PAGE;
WDTCN = 0xDE; // Disable watchdog timer
WDTCN = 0xAD;
OSCILLATOR_Init (); // Initialize oscillator
PORT_Init_UART0 (); // Initialize crossbar and GPIO
UART0_Init (); // Initialize UART0
UART1_Init (); // Initialize UART1
while (1)
{
// print something to UART0
PORT_Init_UART0 (); // Configure Crossbar to pinout
// UART0 TX and RX to P0.0 and P0.1
Uart = 0;
printf ("UART 0\n\n");
// now print something to UART1
PORT_Init_UART1 (); // Configure Crossbar to pinout
// UART1 TX and RX to P0.0 and P0.1
Uart = 1;
printf ("UART 1\n\n");
}
}
//-----------------------------------------------------------------------------
// 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 SYSCLK 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 SYSCLK
// source
SFRPAGE = SFRPAGE_SAVE; // Restore SFRPAGE
}
//-----------------------------------------------------------------------------
// PORT_Init_UART0
//-----------------------------------------------------------------------------
//
// 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
// P1.6 digital push-pull LED
//-----------------------------------------------------------------------------
void PORT_Init_UART0 (void)
{
char SFRPAGE_SAVE = SFRPAGE; // Save Current SFR page
SFRPAGE = CONFIG_PAGE; // Set SFR page
XBR0 = 0x04; // Enable UART0
XBR1 = 0x00;
XBR2 = 0x40; // Enable crossbar and weak pull-up
P0MDOUT |= 0x01; // Set TX pin to push-pull
P1MDOUT |= 0x40; // Set P1.6(LED) to push-pull
SFRPAGE = SFRPAGE_SAVE; // Restore SFR page
}
//-----------------------------------------------------------------------------
// PORT_Init_UART1
//-----------------------------------------------------------------------------
//
// 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
// P1.6 digital push-pull LED
//-----------------------------------------------------------------------------
void PORT_Init_UART1 (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
P1MDOUT |= 0x40; // Set P1.6(LED) to push-pull
SFRPAGE = SFRPAGE_SAVE; // Restore SFR page
}
//-----------------------------------------------------------------------------
// UART0_Init Variable baud rate, Timer 2, 8-N-1
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// Configure UART0 for operation at <BAUDRATE> 8-N-1 using Timer2 as
// baud rate source.
//
//-----------------------------------------------------------------------------
void UART0_Init (void)
{
char SFRPAGE_SAVE;
SFRPAGE_SAVE = SFRPAGE; // Preserve SFRPAGE
SFRPAGE = TMR2_PAGE;
TMR2CN = 0x00; // Timer in 16-bit auto-reload up timer
// mode
TMR2CF = 0x08; // SYSCLK is time base; no output;
// up count only
RCAP2 = - ((long) SYSCLK/BAUDRATE/16);
TMR2 = RCAP2;
TR2= 1; // Start Timer2
SFR16 T2 = 0XCC;
SFRPAGE = UART0_PAGE;
SCON0 = 0x50; // 8-bit variable baud rate;
// 9th bit ignored; RX enabled
// clear all flags
SSTA0 = 0x15; // Clear all flags; enable baud rate
// doubler (not relevant for these
// timers);
// Use Timer2 as RX and TX baud rate
// source;
TI0 = 1; // Indicate TX0 ready
SFRPAGE = SFRPAGE_SAVE; // Restore SFRPAGE
}
//-----------------------------------------------------------------------------
// 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 (SYSCLK/BAUDRATE/2/256 < 1) {
TH1 = -(SYSCLK/BAUDRATE/2);
CKCON |= 0x10; // T1M = 1; SCA1:0 = xx
} else if (SYSCLK/BAUDRATE/2/256 < 4) {
TH1 = -(SYSCLK/BAUDRATE/2/4);
CKCON &= ~0x13; // Clear all T1 related bits
CKCON |= 0x01; // T1M = 0; SCA1:0 = 01
} else if (SYSCLK/BAUDRATE/2/256 < 12) {
TH1 = -(SYSCLK/BAUDRATE/2/12);
CKCON &= ~0x13; // T1M = 0; SCA1:0 = 00
} else {
TH1 = -(SYSCLK/BAUDRATE/2/48);
CKCON &= ~0x13; // Clear all T1 related bits
CKCON |= 0x02; // T1M = 0; SCA1:0 = 10
}
TL1 = TH1; // Initialize Timer1
TR1 = 1; // Start Timer1
SFRPAGE = UART1_PAGE;
TI1 = 1; // Indicate TX1 ready
SFRPAGE = SFRPAGE_SAVE; // Restore SFR page
}
//-----------------------------------------------------------------------------
// Support Subroutines
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// putchar
//-----------------------------------------------------------------------------
//
/* Copyright KEIL ELEKTRONIK GmbH 1990 - 2002 */
/*
* putchar (basic version): expands '\n' into CR LF
*/
// Modified by BW
//
// This routine overloads the standard putchar() library function to support
// either UART0 or UART1, depending on the state of the global variable
// <Uart>.
//
char putchar (char c)
{
char SFRPAGE_SAVE = SFRPAGE;
if (Uart == 0)
{
SFRPAGE = UART0_PAGE;
}
else if (Uart == 1)
{
SFRPAGE = UART1_PAGE;
}
if (c == '\n') // If carriage return
{
while (!TI0);
TI0 = 0;
SBUF0 = 0x0d; // Output CR
}
while (!TI0); // Wait for transmit complete
TI0 = 0;
SBUF0 = c; // Send character
SFRPAGE = SFRPAGE_SAVE;
return c;
}
//-----------------------------------------------------------------------------
// _getkey
//-----------------------------------------------------------------------------
//
/* Copyright KEIL ELEKTRONIK GmbH 1990 - 2002 */
// Modified by BW
//
// This routine overloads the standard _getkey() library function to support
// either UART0 or UART1, depending on the state of the global variable
// <Uart>.
//
char _getkey ()
{
char c;
char SFRPAGE_SAVE = SFRPAGE;
if (Uart == 0)
{
SFRPAGE = UART0_PAGE;
}
else if (Uart == 1)
{
SFRPAGE = UART1_PAGE;
}
while (!RI0); // Wait for byte to be received
c = SBUF0; // Read the byte
SFRPAGE = SFRPAGE_SAVE;
return (c);
}
//-----------------------------------------------------------------------------
// End Of File
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