--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2003, 2004, 2005, 2006, 2007 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2000, 2001, 2002 Bernie Innocenti <bernie@codewiz.org>
+ * Copyright 2011 Onno <developer@gorgoz.org>
+ *
+ * -->
+ *
+ * \brief AVR XMega debug support (implementation).
+ *
+ * This file is heavily inspired by the AVR implementation for BeRTOS,
+ * but uses a different approach for implementing the different debug
+ * ports, by using the USART_t structs.
+ *
+ * \author Onno <developer@gorgoz.org>
+ */
+
+#include <hw/hw_cpufreq.h> /* for CPU_FREQ */
+#include "hw/hw_ser.h" /* Required for bus macros overrides */
+
+#include "cfg/cfg_debug.h" /* for debugging configuration settings */
+#include <cfg/macros.h> /* for BV(), DIV_ROUND */
+
+#include <cpu/types.h>
+#include <cpu/attr.h>
+
+#include <avr/io.h>
+
+/* Set KDBG_USART, KDBG_USART_PORT and KDBG_USART_TX_PIN_bm
+ * according to the CONFIG_KDEBUG_PORT setting
+ * The Xmega A and D families support at least 2 UARTS
+ */
+#if CONFIG_KDEBUG_PORT == 0
+ #define KDBG_USART USARTC0
+ #define KDBG_USART_PORT PORTC
+ #define KDBG_USART_TX_PIN_bm PIN3_bm
+#elif CONFIG_KDEBUG_PORT == 1
+ #define KDBG_USART USARTD0
+ #define KDBG_USART_PORT PORTD
+ #define KDBG_USART_TX_PIN_bm PIN3_bm
+#endif
+/* Allow the configuration of the extra 3 UARTS for the
+ * Xmega A family
+ */
+#ifdef CPU_AVR_XMEGA_A
+ #if CONFIG_KDEBUG_PORT == 2
+ #define KDBG_USART USARTC1
+ #define KDBG_USART_PORT PORTC
+ #define KDBG_USART_TX_PIN_bm PIN7_bm
+ #elif CONFIG_KDEBUG_PORT == 3
+ #define KDBG_USART USARTD1
+ #define KDBG_USART_PORT PORTD
+ #define KDBG_USART_TX_PIN_bm PIN7_bm
+ #elif CONFIG_KDEBUG_PORT == 4
+ #define KDBG_USART USARTE0
+ #define KDBG_USART_PORT PORTE
+ #define KDBG_USART_TX_PIN_bm PIN3_bm
+ #endif
+#endif
+/* Check if all required KDBG_ macros are defined
+ */
+#ifndef KDBG_USART
+ #if CPU_AVR_XMEGA_D
+ #error CONFIG_KDEBUG_PORT should be either 0 or 1
+ #elif CPU_AVR_XMEGA_A
+ #error CONFIG_KDEBUG_PORT should be either 0, 1, 2, 3 or 4
+ #endif
+#endif
+
+/*
+ * Scalefactor to use for computing the baudrate
+ * this scalefactor should be an integer value between -7
+ * and 7
+ */
+#ifndef KDBG_USART_SCALE_FACTOR
+ #define KDBG_USART_SCALE_FACTOR (-7)
+#else
+ #if KDBG_USART_SCALE_FACTOR > 7 || KDBG_USART_SCALE_FACTOR < -7
+ #error KDBG_USART_SCALE_FACTOR should be an integer between -7 and 7
+ #endif
+#endif
+
+/*
+ * \name KDBG macros
+ *
+ * Used to set or alter the KDB_USART operation,
+ * enable the usart or send a byte.
+ * Some of these methods are called/included from kdbg_hw_init()
+ * others are called/included from the cpu independ kdebug implementation
+ * These macros are heavily imspired by the examples provided by atmel
+ *
+ * \{
+ */
+#define KDBG_SET_FORMAT(_charSize, _parityMode, _twoStopBits) \
+ (KDBG_USART).CTRLC = (uint8_t) _charSize | _parityMode | \
+ (_twoStopBits ? USART_SBMODE_bm : 0)
+
+#define KDBG_SET_BAUDRATE(_bselValue, _bScaleFactor) \
+ (KDBG_USART).BAUDCTRLA =(uint8_t)_bselValue; \
+ (KDBG_USART).BAUDCTRLB =(_bScaleFactor << USART_BSCALE0_bp)|(_bselValue >> 8)
+
+#define KDBG_TX_ENABLE() ((KDBG_USART).CTRLB |= USART_TXEN_bm)
+
+#define KDBG_SET_MODE(_usartMode) \
+ ((KDBG_USART).CTRLC = ((KDBG_USART).CTRLC & (~USART_CMODE_gm)) | _usartMode)
+
+#define KDBG_WAIT_READY() do{ loop_until_bit_is_set((KDBG_USART).STATUS, USART_DREIF_bp); } while(0)
+#define KDBG_WAIT_TXDONE() do { loop_until_bit_is_set((KDBG_USART).STATUS, USART_TXCIF_bp); } while(0)
+#define KDBG_WRITE_CHAR(c) do { (KDBG_USART).DATA = (c); } while(0)
+
+#define KDBG_SET_TX_INTERRUPTLEVEL(_txdIntLevel) \
+ (KDBG_USART).CTRLA = ((KDBG_USART).CTRLA & ~USART_TXCINTLVL_gm) | _txdIntLevel
+
+#define KDBG_SET_DRE_INTERRUPTLEVEL(_dreIntLevel) \
+ (KDBG_USART).CTRLA = ((KDBG_USART).CTRLA & ~USART_DREINTLVL_gm) | _dreIntLevel
+
+/*\}*/
+
+/*
+ * To restore the USART state, to registers need to be restored
+ * These registers (CTRLA and CTRLB) can be saved to the
+ * kdbg_avr_xmaga_irqsave structure
+ */
+struct kdbg_avr_xmega_irqsave
+{
+ uint8_t ctrlb;
+ uint8_t ctrla;
+};
+typedef struct kdbg_avr_xmega_irqsave kdbg_irqsave_t;
+
+/*
+ * param is the kdbg_irqsave_t structure
+ *
+ * * Stores the current state of the USART.CTRLA and
+ * the USART.CTRLB registers
+ * * Disables Transmit Complete and Date Register Empty interrupts
+ * * Enabled the transmitter
+ */
+#define KDBG_MASK_IRQ(old) do { \
+ (old).ctrlb = KDBG_USART.CTRLB; \
+ (old).ctrla = KDBG_USART.CTRLA; \
+ KDBG_SET_TX_INTERRUPTLEVEL(USART_TXCINTLVL_OFF_gc); \
+ KDBG_SET_DRE_INTERRUPTLEVEL(USART_DREINTLVL_OFF_gc); \
+ KDBG_TX_ENABLE(); \
+} while(0)
+
+/*
+ * param is the kdbg_irqsave_t structure
+ *
+ * * waits until all data has been transmitted
+ * * restores the USART.CTRLA and USART.CTRLB registers
+ */
+#define KDBG_RESTORE_IRQ(old) do { \
+ KDBG_WAIT_TXDONE(); \
+ KDBG_USART.CTRLB = (old).ctrlb; \
+ KDBG_USART.CTRLA = (old).ctrla; \
+} while(0)
+
+
+/*
+ * method included from the cpu independent kdebug.c file.
+ * it initializes KDBG_USART by:
+ * * Setting the KDBG_USART_TX_PIN_bm as an outputpin
+ * * Setting KDBG_USART to use 8 bits, No parity, 1 stopbit
+ * * Setting the baudrate to 115200
+ * * Enabeling the transmitter
+ */
+INLINE void kdbg_hw_init(void)
+{
+ //set transmit pin as output
+ KDBG_USART_PORT.OUT = KDBG_USART_PORT.OUT & ~KDBG_USART_TX_PIN_bm;
+ KDBG_USART_PORT.DIRSET = KDBG_USART_TX_PIN_bm;
+ //set 8 bits, no parity, 1 stop bit
+ KDBG_SET_FORMAT(USART_CHSIZE_8BIT_gc, USART_PMODE_DISABLED_gc, false);
+ //compute and set the baud rate
+ /* Compute baud-rate period, this requires a valid USART_SCALE_FACTOR */
+ #if KDBG_USART_SCALE_FACTOR < 0
+ uint16_t bsel = DIV_ROUND((1 << (-(KDBG_USART_SCALE_FACTOR))) * (CPU_FREQ - (16 * CONFIG_KDEBUG_BAUDRATE)), 16 * CONFIG_KDEBUG_BAUDRATE);
+ #else
+ uint16_t bsel = DIV_ROUND(CPU_FREQ, (1 << (KDBG_USART_SCALE_FACTOR)) * 16 * CONFIG_KDEBUG_BAUDRATE) - 1;
+ #endif
+ KDBG_SET_BAUDRATE(bsel, KDBG_USART_SCALE_FACTOR);
+ //enable the Transmitter
+ KDBG_TX_ENABLE();
+}
projects / bertos.git / blobdiff