While LED blinking and timer interrupts re working now, I wasn't able to
get serial I/O to work yet. I only see garbage (all received bytes are
either 0x00 or 0x80).
I tried to port my "Hello, world!" that I already got working for many
other mcs51 variants:
#include <stdio.h>
#include <C8051F120.h>
int putchar(int c)
{
while(!(SCON0 & 0x02));
SCON0 &= ~0x02;
SBUF0 = c;
return (c);
}
unsigned char _sdcc_external_startup(void)
{
// Disable watchdog timer
WDTCN = 0xde;
WDTCN = 0xad;
return 0; // perform normal initialization
}
void main(void)
{
unsigned long int i = 0;
// Initialize I/O pins
SFRPAGE = 0xf;
XBR0 = 0x04; // UART0 on P0.0 and P0.1
P0MDOUT = 0x01; // Set port P0.0 (Uart tx) to
push-pull
XBR2 = 0x40; // Enable crossbar
// Configure UART for 300 baud, 8 data bits, 1 stop bit.
SFRPAGE = 0x0;
TMOD = 0x20;
SCON0 = 0x40;
TH1 = 45;
TCON |= 0x40;
SCON0 |= 0x02; // Tell putchar() the UART is
ready to send.
for(;;)
{
printf("Hello World!\n");
for(i = 0; i < 147456; i++); // Sleep
}
}
I've tried to different serial-to-usb converters (one attached to the
R232 header on the board, the other directly to the Tx pin) and multiple
baudrates.
Philipp
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