This LED flashing example was written for a C8051F340 dev board connected to a DVK501 board by Waveshare, the basic example will simply toggle PORT1 high and low
This is the DVK501 board – there are 8 LEDs on the board
AliExpress.com Product – DVK501 MCU PCF8563 DS18B20 MAX3232 PS/2 MAX485 LED Expansion Development Board
This is the development board I used
AliExpress.com Product – free shipping C8051 C8051F350 development board 51 development board
Schematic
Code
This was written in Keil uVision
#include <c8051f340.h> // SFR declarations
//-----------------------------------------------------------------------------
// Function Prototypes
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void);
void PORT_Init (void);
void delay(unsigned int t);
//-----------------------------------------------------------------------------
// main() Routine
//-----------------------------------------------------------------------------
void main (void)
{
PCA0MD &= ~0x40; // WDTE = 0 (clear watchdog timer
// enable)
PORT_Init(); // Initialize Port I/O
OSCILLATOR_Init (); // Initialize Oscillator
while (1)
{
P1 = 0x00; // Turn on LED
delay(1000);
P1 = 0xFF; // Else, turn it off
delay(1000);
}
}
//-----------------------------------------------------------------------------
// OSCILLATOR_Init
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void)
{
OSCICN |= 0x03; // Configure internal oscillator for
// its maximum frequency (24.5 Mhz)
}
//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
void PORT_Init (void)
{
P1MDIN = 0xFF;
P1MDOUT = 0xFF; // enable LEDs as push-pull outputs
XBR1 = 0x40; // Enable crossbar and enable // weak pull-ups
}
//-----------------------------------------------------------------------------
// Delay
//-----------------------------------------------------------------------------
void delay(unsigned int t)
{
unsigned int i,j;
for(i=0;i<t;i++)
for(j=0;j<250;j++);
}Links