[PATCH 34.5 6/6] LEON3: added TX-wait-complete and CR on NL support for UART

[Daniel Hellstrom]

On 04/18/2012 05:38 PM, Joel Sherrill wrote:
>
> apbuart_outbyte_polled prototype should still have closing
> parenthesis on separate line.
>
> rtems_io_register_name spacing on parentheses is inconsistent.

Sorry, I missed those. Will update the patch.

>
> Is debugputs.c really the right name? There should no longer
> be a method with that name. Only printk() support. 

You're right, I never thought about that actually, it have always been named that way... don't know why.

I can submit a new patch after ChunkF, since PATCH 35 depends upon debugputs.c. I can rename it to printk_support.c.


> And I
> don't know why you would need the cr/lf translation.

Since printk() doesn't translate \n into \r\n the driver must do it? Before this patch all terminal output was on one line, which was overwritten all the time. It did however work in simulators like 
TSIM/GRSIM since the terminal they run within understand only newline.

Thanks,
Daniel

>
>
> On 04/18/2012 10:19 AM, Daniel Hellstrom wrote:
>> Signed-off-by: Daniel Hellstrom<daniel at gaisler.com>
>> ---
>>   c/src/lib/libbsp/sparc/leon3/console/console.c   |   10 ++++++----
>>   c/src/lib/libbsp/sparc/leon3/console/debugputs.c |   18 ++++++++++++++++--
>>   2 files changed, 22 insertions(+), 6 deletions(-)
>>
>> diff --git a/c/src/lib/libbsp/sparc/leon3/console/console.c b/c/src/lib/libbsp/sparc/leon3/console/console.c
>> index 068aced..c095979 100644
>> --- a/c/src/lib/libbsp/sparc/leon3/console/console.c
>> +++ b/c/src/lib/libbsp/sparc/leon3/console/console.c
>> @@ -50,8 +50,10 @@ int syscon_uart_index __attribute__((weak)) = 0;
>>
>>   extern void apbuart_outbyte_polled(
>>     ambapp_apb_uart *regs,
>> -  char ch
>> -);
>> +  unsigned char ch,
>> +  int do_cr_on_newline,
>> +  int wait_sent);
>> +
>>
>>   /* body is in debugputs.c */
>>
>> @@ -157,7 +159,7 @@ ssize_t console_write_polled (int minor, const char *buf, size_t len)
>>       port = minor - 1;
>>
>>     while (nwrite<  len) {
>> -    apbuart_outbyte_polled(apbuarts[port].regs, *buf++);
>> +    apbuart_outbyte_polled(apbuarts[port].regs, *buf++, 1, 0);
>>       nwrite++;
>>     }
>>     return nwrite;
>> @@ -346,7 +348,7 @@ rtems_device_driver console_initialize(
>>      * On a MP system one should not open UARTs that other OS instances use.
>>      */
>>     if (syscon_uart_index<  uarts) {
>> -    status = rtems_io_register_name( "/dev/console", major, 0 );
>> +    status = rtems_io_register_name( "/dev/console", major, 0);
>>       if (status != RTEMS_SUCCESSFUL)
>>         rtems_fatal_error_occurred(status);
>>     }
>> diff --git a/c/src/lib/libbsp/sparc/leon3/console/debugputs.c b/c/src/lib/libbsp/sparc/leon3/console/debugputs.c
>> index 7058cf8..080d4fa 100644
>> --- a/c/src/lib/libbsp/sparc/leon3/console/debugputs.c
>> +++ b/c/src/lib/libbsp/sparc/leon3/console/debugputs.c
>> @@ -89,9 +89,12 @@ int bsp_debug_uart_init(void)
>>    */
>>   void apbuart_outbyte_polled(
>>     ambapp_apb_uart *regs,
>> -  unsigned char ch
>> +  unsigned char ch,
>> +  int do_cr_on_newline,
>> +  int wait_sent
>>   )
>>   {
>> +send:
>>     while ( (regs->status&  LEON_REG_UART_STATUS_THE) == 0 ) {
>>       /* Lower bus utilization while waiting for UART */
>>       asm volatile ("nop"::); asm volatile ("nop"::);
>> @@ -100,6 +103,17 @@ void apbuart_outbyte_polled(
>>       asm volatile ("nop"::); asm volatile ("nop"::);
>>     }
>>     regs->data = (unsigned int) ch;
>> +
>> +  if ((ch == '\n')&&  do_cr_on_newline) {
>> +    ch = '\r';
>> +    goto send;
>> +  }
>> +
>> +  /* Wait until the character has been sent? */
>> +  if (wait_sent) {
>> +    while ((regs->status&  LEON_REG_UART_STATUS_THE) == 0)
>> +      ;
>> +  }
>>   }
>>
>>   /*
>> @@ -129,7 +143,7 @@ static void bsp_out_char(char c)
>>       return;
>>     }
>>
>> -  apbuart_outbyte_polled(dbg_uart, c);
>> +  apbuart_outbyte_polled(dbg_uart, c, 1, 1);
>>   }
>>
>>   /*
>
>