Lpc2000

Hi,
I Linux-2.16 PC to collect the data sent by the LPC 2138. The 8KB data
said in the previous mail is splitted in to 128 bytes of chunks and
then transferred from LPC. If the delay is inserted between the
chunks, it is working without any problem. If delay is removed then
the PC is loosing the data.

Thanks & Regards,
Mohan

On 7/22/05, Tim Wade <tim.wade@....au> wrote:
>  Hi 
>  
>  I really wouldn't blame the LPC -- it is very likely that the PC is 
>  loosing the characters... 
>  
>  We had a FAST PC logging data coming from a GPS receiver at 56K, so not 
>  very fast really, but come hell nor high water we could NOT get the PC 
>  to collect all the characters. Eventually we got a HIGH QUALITY 
>  USB<=>RS232 interface and that worked fine... Windows is NOT very real 
>  time at all... In fact it is almost completely useless for any sort of 
>  time constrained operation at all. Just because it is popular does not 
>  mean that it works very well... 
> 
>  
>  
>  
>  -----Original Message----- 
>  From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf 
>  Of Mohan K 
>  Sent: Friday, 22 July 2005 11:45 AM 
>  To: lpc2000@yahoogroups.com 
>  Cc: ph@... 
>  Subject: Re: [lpc2000] More UART woes 
>  
>  Hi all/PH, 
>  I am also facing the same problem. 
>  When I try to send the 8+Kbytes of data, on the other end am loosing 
>  some bytes. The speed of transmission is 115200kbps. The driver uses a 
>  circular buffer for transmission. Following is the code used to transfer 
>  8Kbytes of data: 
>  
>  int uart1Putch(int ch) 
>  { 
>        //#ifdef UART0_TX_INT_MODE 
>          uint16_t temp; 
>        //  unsigned cpsr; 
>        temp = (uart1_tx_insert_idx + 1) % UART1_TX_BUFFER_SIZE; 
>        if(temp == uart1_tx_extract_idx) 
>            return -1;                          // no room 
>          //cpsr = disableIRQ();                  // disable global 
>  interrupts 
>          U1IER &= ~UIER_ETBEI;                 // disable TX interrupts 
>          //restoreIRQ(cpsr);                     // restore
> global 
>  interrupts 
>        // check if in process of sending data 
>          if(uart1_tx_running) 
>      { 
>            // add to queue 
>             uart1_tx_buffer[uart1_tx_insert_idx] =
> (uint8_t)ch; 
>             uart1_tx_insert_idx = temp; 
>      } 
>          else 
>      { 
>            // set running flag and write to output register 
>             uart1_tx_running = 1; 
>              U1THR = (uint8_t)ch; 
>      } 
>        //cpsr = disableIRQ();                  // disable global 
>  interrupts 
>          U1IER |= UIER_ETBEI;              // enable TX interrupts 
>          //restoreIRQ(cpsr);                     // restore
> global 
>  interrupts 
>        return (uint8_t)ch; 
>  } 
>  
>  Am i missing anything? Please advice me. 
>  
>  Thanks & Regards, 
>  Mohan 
>  
>  
>  
>  
>  On 7/21/05, vajper0 <ph@...> wrote: 
>  > Still working on my UART driver for the LPC2138. Now I'm having 
>  > problems with lost Tx data from the LPC to a PC. I don't have a clue 
>  > about what I'm doing wrong and I haven't found anything on the web 
>  > indicating this is a common problem. 
>  > 
>  > The problem is that sometimes one or a few bytes that I write to the 
>  > THR don't show up at the PC. If there is data to be transmitted I 
>  > write one byte to the THR (first checking the LSR5 to be really shure 
>  > there is  room for a byte). Then I write 16 bytes to the THR every 
>  > time I get a THR IRQ (also here checking LSR5 to be 100% sure the FIFO 
>  
>  > is empty). 
>  > 
>  > Doing the above results in lost data at the other end. This happens 
>  > approximately every 20-50kbytes. I've tried this at different speeds, 
>  > even as low as 57600bps. The FIFOs are enabled. 
>  > 
>  > Am I missing something? 
>  > 
>  > /PH 
>  > 
>  > 
>  > 
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