function for configuring uart :


int8_t uartX_init( )
  equivalent to uartX_set(NULL)


int8_t uartX_get (struct uart_params * conf ) 
  return values : 
    0 if ok
    < 0 if error

this func fills the value of the structure with current values.


int8_t uartX_set( struct uart_params conf );
  return values :
    0 if ok
    < 0 if error

apply the conf. If conf==NULL, apply the default conf (static)


int8_t uart_enable(struct uart_param)
int8_t uart_disable(struct uart_param)

int8_t uart_tx_enable(struct uart_param)
int8_t uart_tx_disable(struct uart_param)

int8_t uart_rx_enable(struct uart_param)
int8_t uart_rx_disable(struct uart_param)

int8_t uart_dont_loose_data(struct uart_param)
int8_t uart_can_loose_data(struct uart_param)

int8_t uart_use_double_speed(struct uart_param)
int8_t uart_use_simple_speed(struct uart_param)

int8_t uart_parity_none(struct uart_param)
int8_t uart_parity_odd(struct uart_param)
int8_t uart_parity_even(struct uart_param)

int8_t uart_stop_bits(struct uart_param, uint8_t nbits)

int8_t uart_baudrate(struct uart_param, uint32_t baudrate)


struct uart_param {
   unsigned char enabled : 1,
		 tx_enabled : 1,
                 rx_enabled : 1,
                 dont_loose_data : 1,
                 use_double_speed : 1,
                 partity : 2,
                 stop_bit : 1;
   uint8_t nbits;
   uint32_t baudrate;
}



Configuration example :

** change one parameter only :

uart1_set_baudrate(uint32_t baudrate)
{
  struct uart_param u;

  if (uart1_get(&u) < 0) {
    printf ("error");
    goto error;
  }

  if (uart1_baudrate(u, baudrate) < 0) {
    printf ("error");
    goto error;
  }

  if (uart1_set(u) < 0) {
    printf ("error");
    goto error;
  }

  return 0;

error:
  return 1;
}