On 19.08.2016 23:11, [email protected] wrote:
> Hi, I created some small examples for the C8051F***
>
> https://github.com/merbanan/C8051F300_examples
>
> I tried these examples on a F340 but something doesnt work correctly when
> I send data over the serial port and sdcc. If I use Keil it works fine.
> And the same code works fine on the F300.
>
> I'd be happy to supply you with hardware if you are interested to
> investigate the issue. Currently I use Keil which works with what I want
> to do, but doing open stuff and needing a non free compiler causes an itch
> I want to scratch.
>
> MvH
> Benjamin Larsson
>
I have serial output on the C8051F330 board RDM6300 working via
putchar() (see attached code). But whenever I try to use printf(),
everything gets messed up: Garbage output on the serial line or the
device resets.
I've tried different memeory models and reentrency, but don't see a
change in behaviour. printf() takes us over 4K of flash, but the
C8051F330 has 8KB, so we should be ok.
Philipp
#include <stdio.h>
__sfr __at(0xe1) XBR0;
__sfr __at(0xe2) XBR1;
__sfr __at(0xa4) P0MDOUT;
__sfr __at(0xd9) PCA0MD;
__sfr __at(0x88) TCON;
__sfr __at(0x89) TMOD;
__sfr __at(0x8b) TL1;
__sfr __at(0x8d) TH1;
__sfr __at(0x98) SCON0;
__sfr __at(0x99) SBUF0;
int putchar(int c)
{
while(!(SCON0 & 0x02));
SCON0 &= ~0x02;
SBUF0 = c;
return (c);
}
unsigned char _sdcc_external_startup(void)
{
PCA0MD = 0; // Disable watchdog timer
return 0; // perform normal initialization
}
void main(void)
{
unsigned long int i = 0;
// Initialize I/O pins
P0MDOUT = 0x10; // Set port P0.4 (Uart tx) to push-pull
XBR0 = 0x01; // UART0 on P0.4 and P0.5
XBR1 = 0x40; // Enable push/pull for Tx
// Configure UART for 1200 baud, 8 data bits, 1 stop bit.
TMOD = 0x20;
TH1 = 150;
TCON |= 0x40;
SCON0 = 0x42;
for(;;)
{
putchar('A');
putchar('B');
putchar('C');
for(i = 0; i < 147456; i++); // Sleep
putchar('D'); // Proof that its not just the watchdog resetting us
for(i = 0; i < 147456; i++); // Sleep
printf("Hello World!\n");
for(;;); // Proof that the device gets reset during printf()
}
}
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