nes-proj/cpu/arm/aducrf101/dev/uart.c

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/**
* Copyright (c) 2014, Analog Devices, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted (subject to the limitations in the
* disclaimer below) provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - 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.
*
* - Neither the name of Analog Devices, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
* GRANTED BY THIS LICENSE. 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 OWNER 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.
*/
/**
* \author Jim Paris <jim.paris@rigado.com>
*/
#include <aducrf101-include.h>
static int (*uart_input_handler)(unsigned char c);
static int stdout_enabled;
void
uart_init(int baud)
{
/* P1.0 is UARTRXD, P1.1 is UARTTXD */
pADI_GP1->GPCON &= ~(GP1CON_CON0_MSK | GP1CON_CON1_MSK);
pADI_GP1->GPCON |= GP1CON_CON0_UART0RXD | GP1CON_CON1_UART0TXD;
/* Set P1.1 as output */
GP1OEN_OEN1_BBA = 1;
/* Set baudrate */
int div = (F_CPU / 32) / baud;
pADI_UART->COMDIV = div;
pADI_UART->COMFBR = 0x8800 | ((((64 * F_CPU) / div) / baud) - 2048);
pADI_UART->COMIEN = 0;
pADI_UART->COMLCR = 3;
/* Set up RX IRQ */
pADI_UART->COMIEN = COMIEN_ERBFI_EN;
NVIC_EnableIRQ(UART_IRQn);
__enable_irq();
uart_input_handler = NULL;
stdout_enabled = 1;
}
/*---------------------------------------------------------------------------*/
void
uart_put(unsigned char x)
{
while(!(pADI_UART->COMLSR & COMLSR_THRE))
continue;
pADI_UART->COMTX = x;
}
/*---------------------------------------------------------------------------*/
void
UART_Int_Handler(void)
{
if(pADI_UART->COMIIR & COMIIR_STA_RXBUFFULL) {
unsigned char x = pADI_UART->COMRX;
if(uart_input_handler) {
uart_input_handler(x);
}
}
}
/*---------------------------------------------------------------------------*/
void
uart_set_input(int (*input)(unsigned char c))
{
uart_input_handler = input;
}
void
uart_enable_stdout(int enabled)
{
stdout_enabled = enabled;
}
/*---------------------------------------------------------------------------*/
/* Connect newlib's _write function to the UART. */
int
_write(int fd, const void *buf, size_t len)
{
if(stdout_enabled == 0) {
return -1;
}
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if(fd == 1 || fd == 2) {
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int n = len;
const unsigned char *p = buf;
while(n--)
uart_put(*p++);
return len;
}
return -1;
}
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/*---------------------------------------------------------------------------*/
#ifdef __ICCARM__
/* Connect IAR's __write function to the UART. */
size_t
__write(int fd, const unsigned char *buf, size_t count)
{
return _write(fd, buf, count);
}
#endif