153 lines
7.4 KiB
C
153 lines
7.4 KiB
C
/*
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* Copyright (c) 2014, Analog Devices, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \author Maxim Salov <max.salov@gmail.com>, Ian Martin <martini@redwirellc.com>
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*/
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#include "rl78.h" /* for f_CLK */
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#include "sfrs.h"
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#include "sfrs-ext.h"
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#include "uart0.h"
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#define DESIRED_BAUDRATE 38400
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/* Note that only 9600, 38400, and 115200 bps were tested. */
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#define PRESCALE_THRESH ((38400 + 115200) / 2)
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#define PRS_VALUE ((DESIRED_BAUDRATE < PRESCALE_THRESH) ? 4 : 0)
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#define f_MCK (f_CLK / (1 << PRS_VALUE))
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#define SDR_VALUE (f_MCK / DESIRED_BAUDRATE / 2 - 1)
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void
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uart0_init(void)
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{
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/* Reference R01AN0459EJ0100 or hardware manual for details */
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PIOR = 0U; /* Disable IO redirection */
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PM1 |= 0x06U; /* Set P11 and P12 as inputs */
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SAU0EN = 1; /* Supply clock to serial array unit 0 */
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SPS0 = (PRS_VALUE << 4) | PRS_VALUE; /* Set input clock (CK00 and CK01) to fclk/16 = 2MHz */
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ST0 = 0x03U; /* Stop operation of channel 0 and 1 */
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/* Setup interrupts (disable) */
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STMK0 = 1; /* Disable INTST0 interrupt */
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STIF0 = 0; /* Clear INTST0 interrupt request flag */
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STPR10 = 1; /* Set INTST0 priority: lowest */
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STPR00 = 1;
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SRMK0 = 1; /* Disable INTSR0 interrupt */
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SRIF0 = 0; /* Clear INTSR0 interrupt request flag */
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SRPR10 = 1; /* Set INTSR0 priority: lowest */
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SRPR00 = 1;
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SREMK0 = 1; /* Disable INTSRE0 interrupt */
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SREIF0 = 0; /* Clear INTSRE0 interrupt request flag */
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SREPR10 = 1; /* Set INTSRE0 priority: lowest */
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SREPR00 = 1;
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/* Setup operation mode for transmitter (channel 0) */
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SMR00 = 0x0023U; /* Operation clock : CK00,
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Transfer clock : division of CK00
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Start trigger : software
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Detect falling edge as start bit
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Operation mode : UART
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Interrupt source : buffer empty
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*/
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SCR00 = 0x8097U; /* Transmission only
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Reception error interrupt masked
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Phase clock : type 1
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No parity
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LSB first
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1 stop bit
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8-bit data length
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*/
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SDR00 = SDR_VALUE << 9;
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/* Setup operation mode for receiver (channel 1) */
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NFEN0 |= 1; /* Enable noise filter on RxD0 pin */
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SIR01 = 0x0007U; /* Clear error flags */
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SMR01 = 0x0122U; /* Operation clock : CK00
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Transfer clock : division of CK00
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Start trigger : valid edge on RxD pin
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Detect falling edge as start bit
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Operation mode : UART
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Interrupt source : transfer end
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*/
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SCR01 = 0x4097U; /* Reception only
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Reception error interrupt masked
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Phase clock : type 1
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No parity
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LSB first
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1 stop bit
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8-bit data length
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*/
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SDR01 = SDR_VALUE << 9;
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SO0 |= 1; /* Prepare for use of channel 0 */
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SOE0 |= 1;
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P1 |= (1 << 2); /* Set TxD0 high */
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PM1 &= ~(1 << 2); /* Set output mode for TxD0 */
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PM1 |= (1 << 1); /* Set input mode for RxD0 */
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SS0 |= 0x03U; /* Enable UART0 operation (both channels) */
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STIF0 = 1; /* Set buffer empty interrupt request flag */
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}
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void
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uart0_putchar(int c)
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{
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while(0 == STIF0) ;
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STIF0 = 0;
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SDR00 = c;
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}
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char
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uart0_getchar(void)
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{
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char c;
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while(!uart0_can_getchar()) ;
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c = SDR01;
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SRIF0 = 0;
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return c;
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}
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int
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uart0_puts(const char *s)
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{
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int len = 0;
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SMR00 |= 0x0001U; /* Set buffer empty interrupt */
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while('\0' != *s) {
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uart0_putchar(*s);
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s++;
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++len;
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}
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#if 0
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while(0 == STIF0) ;
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STIF0 = 0;
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SDR00.sdr00 = '\r';
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#endif
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SMR00 &= ~0x0001U;
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uart0_putchar('\n');
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#if 0
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while(0 != SSR00.BIT.bit6) ; /* Wait until TSF00 == 0 */
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#endif
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return len;
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}
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