contiki/cpu/cc26xx/putchar.c
George Oikonomou 07272b7cd6 Improve UART power-cycling logic:
* Only enable TX by default.
* Add some magic for RX handling. When an input handler is registered:
  * Automatically enable RX-related and interrupts
  * Automatically lock the SERIAL PD on under all power modes
  * Automatically enable the UART clock under sleep and deep sleep
  * Automatically undo all of the above when the input handler becomes NULL
  * As a result, modules / examples that need UART RX no longer need to clock the UART and manipulate the SERIAL PD. They simply have to specify an input handler
* Don't automatically power on the UART whenever the CM3 is active
* Before accessing the UART, make sure it is powered and clocked
* Avoid falling edge glitches
* Fix garbage characters / Explicitly wait for UART TX to complete
2015-05-15 09:21:04 +01:00

86 lines
2.8 KiB
C

/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*---------------------------------------------------------------------------*/
#include "cc26xx-uart.h"
#include "ti-lib.h"
#include <string.h>
/*---------------------------------------------------------------------------*/
int
putchar(int c)
{
cc26xx_uart_write_byte(c);
return c;
}
/*---------------------------------------------------------------------------*/
int
puts(const char *str)
{
int i;
if(str == NULL) {
return 0;
}
for(i = 0; i < strlen(str); i++) {
cc26xx_uart_write_byte(str[i]);
}
cc26xx_uart_write_byte('\n');
/*
* Wait for the line to go out. This is to prevent garbage when used between
* UART on/off cycles
*/
while(cc26xx_uart_busy() == UART_BUSY);
return i;
}
/*---------------------------------------------------------------------------*/
unsigned int
dbg_send_bytes(const unsigned char *s, unsigned int len)
{
unsigned int i = 0;
while(s && *s != 0) {
if(i >= len) {
break;
}
cc26xx_uart_write_byte(*s++);
i++;
}
/*
* Wait for the buffer to go out. This is to prevent garbage when used
* between UART on/off cycles
*/
while(cc26xx_uart_busy() == UART_BUSY);
return i;
}
/*---------------------------------------------------------------------------*/