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CPing
Guest
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| usb not working properly |
 Posted: Thu Jul 02, 2009 1:27 am |
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Hi,
I want to use the CDC Driver to send a 5 Digit Value to the PIC and store it and read it. I have assigned the commands but when I compile the value being read is not what is programmed. For Example the 89098 Initial Value is read as 23562 When a Read Command is issued. Also is there is a better way to read the USB CDC Input Data in Strings rather than as characters. Please Help.
| Code: | #DEFINE LED1 PIN_A5
#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#use rs232(baud=115200, xmit=PIN_C6, rcv=PIN_C7)
#include <usb_cdc.h>
#include <LcdCustom.c>
/////////////////////////////////////////////////////////////////////////////
//
// Configure the demonstration I/O
//
/////////////////////////////////////////////////////////////////////////////
#define LED2 PIN_B4
#define LED3 PIN_B5
#DEFINE BUTTON PIN_A4
#define LED_ON output_low
#define LED_OFF output_high
Long Int Value=89098;
/////////////////////////////////////////////////////////////////////////////
//
// usb_debug_task()
//
// When called periodically, displays debugging information over serial
// to display enumeration and connection states. Also lights LED1 based upon
// enumeration and status.
//
/////////////////////////////////////////////////////////////////////////////
void usb_debug_task(void) {
static int8 last_connected;
static int8 last_enumerated;
int8 new_connected;
int8 new_enumerated;
static int8 last_cdc;
int8 new_cdc;
new_connected=usb_attached();
new_enumerated=usb_enumerated();
new_cdc=usb_cdc_connected();
if (new_enumerated)
LED_ON(LED1);
else
LED_OFF(LED1);
if (new_cdc)
LED_ON(LED2);
else
LED_OFF(LED2);
if (usb_cdc_carrier.dte_present)
LED_ON(LED3);
else
LED_OFF(LED3);
if (new_connected && !last_connected)
printf("USB connected, waiting for enumaration...\r\n\n"); //none of this is output to hyperterminal
if (!new_connected && last_connected)
printf("USB disconnected, waiting for connection...\r\n\n");
if (new_enumerated && !last_enumerated)
printf("USB enumerated by PC/HOST\r\n\n");
if (!new_enumerated && last_enumerated)
printf("USB unenumerated by PC/HOST, waiting for enumeration...\r\n\n");
if (new_cdc && !last_cdc) {
printf("Serial program initiated on USB<->UART COM Port\r\n\n");
printf(usb_cdc_putc, "\r\n\nCDC\r\n\n");
}
last_connected=new_connected;
last_enumerated=new_enumerated;
last_cdc=new_cdc;
}
void SetValue(char Num,Int8 Position)
{
int Number;
Number = Num %10;
if(Position == 0)
Value = Value + Number;
else if(Position == 1)
Value = Value + (Number*10);
else if(Position == 2)
Value = Value + (Number*100);
else if(Position == 3)
Value = Value + (Number*1000);
else if(Position == 4)
Value = Value + (Number*10000);
}
void main(void) {
char c;
Int8 Loop=0;
Int8 TxFlag=0;
LED_OFF(LED1);
LED_OFF(LED2);
LED_OFF(LED3);
printf("\r\n\nCDC\r\n");
#ifdef __PCH__
printf("PCH: v");
printf(__PCH__);
#else
printf("PCM: v");
printf(__PCM__);
#endif
printf("\r\n");
usb_init();
#if !(__USB_PIC_PERIF__)
printf("USBN: 0x%X", usbn_get_version());
printf("\r\n\n");
#endif
Lcd_Init();
printf(lcd_putc,"\fCDC Demo");
delay_ms(300);
while (TRUE) {
usb_task();
usb_debug_task();
Lcd_putc("\f");
if (usb_cdc_kbhit())
{
c=usb_cdc_getc();
if(TxFlag==0)
{
Loop=0;
if (c=='\n') {putc('\r'); putc('\n');}
if (c=='\r') {putc('\r'); putc('\n');}
if (c=='$') {printf(usb_cdc_putc, "\r\n\nRESET COMMAND\r\n\n");}
if (c=='V') {printf(usb_cdc_putc, "\r\n\nVerison = 1.0\r\n\n");}
if (c=='P') {printf(usb_cdc_putc, "\r\n\nProduct = Demo\r\n\n");}
if (c=='M') {printf(usb_cdc_putc, "\r\n\nManufacturer = CCS\r\n\n");}
if (c=='s')
{
printf(usb_cdc_putc,"\r\nEnter Value\n\r");
TxFlag=1;
Value = 0;
}
if (c=='R')
{
printf(usb_cdc_putc,"\r\nValue = %LD",Value);
usb_cdc_putc("\n\r");
}
}
else
{
SetValue(c-0x30,4-Loop);
Loop++;
usb_cdc_putc(c);
if(Loop==5)
{
TxFlag=0;
printf(usb_cdc_putc,"\r\nAcknowledged.\n\r");
printf(usb_cdc_putc, "Set Value = %LU",Value);
usb_cdc_putc("\n\r");
Loop=0;
}
}
}
}
} |
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Ttelmah
Guest
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| Posted: Thu Jul 02, 2009 2:43 am |
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The USB hardware transfers bytes.
Bytes=characters.
Why should anything be better?.
Reason for difference. Long integer = 16bit = 65536 _max_. Can't hold 89098. Take the low 16bits of 89098, and you get 23562...
Best Wishes |
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CPing
Guest
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| usb not working properly |
| Posted: Thu Jul 02, 2009 3:52 am |
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| Thanks. That solved the issue but how do I get the input as a string so that I can parse the string. I want to attempt to implement SCPI. |
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Ttelmah
Guest
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| Posted: Thu Jul 02, 2009 9:48 am |
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The commonest 'parsers' published here, have been for modem control strings, and GPS data. Both could provide bases for parsing SCPI strings with a bit of modification. I posted a 'tree search parser, which could also provide some ideas.
Best Wishes |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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