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-rw-r--r--pwm_boot/Makefile204
-rw-r--r--pwm_boot/df10ch_pwm_boot.c (renamed from pwm_boot/10ch_pwm_boot.c)950
2 files changed, 577 insertions, 577 deletions
diff --git a/pwm_boot/Makefile b/pwm_boot/Makefile
index 1a98f84..fb401ea 100644
--- a/pwm_boot/Makefile
+++ b/pwm_boot/Makefile
@@ -1,102 +1,102 @@
-#
-# Copyright (C) 2010 Andreas Auras
-#
-# This file is part of the DF10CH Atmolight controller project.
-#
-# DF10CH Atmolight controller 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.
-#
-# DF10CH Atmolight controller 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 Street, Fifth Floor, Boston, MA 02110, USA
-#
-#
-###############################################################################
-# Makefile for the bootloader firmware of PWM processor
-###############################################################################
-
-## General Flags
-PROJECT = 10ch_pwm_boot
-MCU = atmega162
-TARGET = 10ch_pwm_boot.elf
-CC = avr-gcc
-AVRDUDE ?= avrdude -c stk500v2 -P avrdoper
-F_CPU ?= 16000000UL
-FIRMWARE_VERSION ?= 1
-
-## Options common to compile, link and assembly rules
-COMMON = -mmcu=$(MCU)
-
-## Compile options common for all C compilation units.
-CFLAGS = $(COMMON)
-CFLAGS += -Wall -gdwarf-2 -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
-CFLAGS += -DF_CPU=$(F_CPU) -DFIRMWARE_VERSION=$(FIRMWARE_VERSION)
-
-## Assembly specific flags
-ASMFLAGS = $(COMMON)
-ASMFLAGS += $(CFLAGS)
-ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2
-
-## Linker flags
-LDFLAGS = $(COMMON)
-LDFLAGS += -Wl,-Map=10ch_pwm_boot.map
-LDFLAGS += -Wl,-section-start=.text=0x3800
-
-
-## Intel Hex file production flags
-HEX_FLASH_FLAGS = -R .eeprom -R .fuse -R .lock -R .signature
-
-HEX_EEPROM_FLAGS = -j .eeprom
-HEX_EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load"
-
-## Include Directories
-INCLUDES = -I. -I..
-
-## Objects that must be built in order to link
-OBJECTS = 10ch_pwm_boot.o
-
-## Objects explicitly added by the user
-LINKONLYOBJECTS =
-
-## Build
-all: $(TARGET) 10ch_pwm_boot.hex 10ch_pwm_boot.lss size
-
-prog: flash
- $(AVRDUDE) -p $(MCU) -u -Ulfuse:w:0xc0:m -Uhfuse:w:0xc8:m -Uefuse:w:0xf9:m -Ulock:w:0xef:m
-
-flash: 10ch_pwm_boot.hex
- $(AVRDUDE) -p $(MCU) -Uflash:w:10ch_pwm_boot.hex:i
-
-
-## Compile
-10ch_pwm_boot.o: 10ch_pwm_boot.c ../df10ch_usb_proto.h ../df10ch_common.h
- $(CC) $(INCLUDES) $(CFLAGS) -c $<
-
-##Link
-$(TARGET): $(OBJECTS)
- $(CC) $(LDFLAGS) $(OBJECTS) $(LINKONLYOBJECTS) $(LIBDIRS) $(LIBS) -o $(TARGET)
-
-%.hex: $(TARGET)
- avr-objcopy -O ihex $(HEX_FLASH_FLAGS) $< $@
-
-%.eep: $(TARGET)
- -avr-objcopy $(HEX_EEPROM_FLAGS) -O ihex $< $@ || exit 0
-
-%.lss: $(TARGET)
- avr-objdump -h -S $< > $@
-
-size: ${TARGET}
- @echo
- @avr-size -C --mcu=${MCU} ${TARGET}
-
-## Clean target
-.PHONY: clean
-clean:
- -rm -rf $(OBJECTS) 10ch_pwm_boot.elf 10ch_pwm_boot.hex 10ch_pwm_boot.eep 10ch_pwm_boot.lss 10ch_pwm_boot.map
+#
+# Copyright (C) 2010 Andreas Auras
+#
+# This file is part of the DF10CH Atmolight controller project.
+#
+# DF10CH Atmolight controller is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# DF10CH Atmolight controller is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+#
+#
+###############################################################################
+# Makefile for the bootloader firmware of PWM processor
+###############################################################################
+
+## General Flags
+PROJECT = df10ch_pwm_boot
+MCU = atmega162
+TARGET = df10ch_pwm_boot.elf
+CC = avr-gcc
+AVRDUDE ?= avrdude -c stk500v2 -P avrdoper
+F_CPU ?= 16000000UL
+FIRMWARE_VERSION ?= 1
+
+## Options common to compile, link and assembly rules
+COMMON = -mmcu=$(MCU)
+
+## Compile options common for all C compilation units.
+CFLAGS = $(COMMON)
+CFLAGS += -Wall -gdwarf-2 -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -DF_CPU=$(F_CPU) -DFIRMWARE_VERSION=$(FIRMWARE_VERSION)
+
+## Assembly specific flags
+ASMFLAGS = $(COMMON)
+ASMFLAGS += $(CFLAGS)
+ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2
+
+## Linker flags
+LDFLAGS = $(COMMON)
+LDFLAGS += -Wl,-Map=df10ch_pwm_boot.map
+LDFLAGS += -Wl,-section-start=.text=0x3800
+
+
+## Intel Hex file production flags
+HEX_FLASH_FLAGS = -R .eeprom -R .fuse -R .lock -R .signature
+
+HEX_EEPROM_FLAGS = -j .eeprom
+HEX_EEPROM_FLAGS += --set-section-flags=.eeprom="alloc,load"
+
+## Include Directories
+INCLUDES = -I. -I..
+
+## Objects that must be built in order to link
+OBJECTS = df10ch_pwm_boot.o
+
+## Objects explicitly added by the user
+LINKONLYOBJECTS =
+
+## Build
+all: $(TARGET) df10ch_pwm_boot.hex df10ch_pwm_boot.lss size
+
+prog: flash
+ $(AVRDUDE) -p $(MCU) -u -Ulfuse:w:0xc0:m -Uhfuse:w:0xc8:m -Uefuse:w:0xf9:m -Ulock:w:0xef:m
+
+flash: df10ch_pwm_boot.hex
+ $(AVRDUDE) -p $(MCU) -Uflash:w:df10ch_pwm_boot.hex:i
+
+
+## Compile
+df10ch_pwm_boot.o: df10ch_pwm_boot.c ../df10ch_usb_proto.h ../df10ch_common.h
+ $(CC) $(INCLUDES) $(CFLAGS) -c $<
+
+##Link
+$(TARGET): $(OBJECTS)
+ $(CC) $(LDFLAGS) $(OBJECTS) $(LINKONLYOBJECTS) $(LIBDIRS) $(LIBS) -o $(TARGET)
+
+%.hex: $(TARGET)
+ avr-objcopy -O ihex $(HEX_FLASH_FLAGS) $< $@
+
+%.eep: $(TARGET)
+ -avr-objcopy $(HEX_EEPROM_FLAGS) -O ihex $< $@ || exit 0
+
+%.lss: $(TARGET)
+ avr-objdump -h -S $< > $@
+
+size: ${TARGET}
+ @echo
+ @avr-size -C --mcu=${MCU} ${TARGET}
+
+## Clean target
+.PHONY: clean
+clean:
+ -rm -rf $(OBJECTS) df10ch_pwm_boot.elf df10ch_pwm_boot.hex df10ch_pwm_boot.eep df10ch_pwm_boot.lss df10ch_pwm_boot.map
diff --git a/pwm_boot/10ch_pwm_boot.c b/pwm_boot/df10ch_pwm_boot.c
index 787f5df..8795a5c 100644
--- a/pwm_boot/10ch_pwm_boot.c
+++ b/pwm_boot/df10ch_pwm_boot.c
@@ -1,475 +1,475 @@
-/*
- * Copyright (C) 2010 Andreas Auras
- *
- * This file is part of the DF10CH Atmolight controller project.
- *
- * DF10CH Atmolight controller 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.
- *
- * DF10CH Atmolight controller 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 Street, Fifth Floor, Boston, MA 02110, USA
- *
- */
-
-// ======================================================================
-// Bootloader firmware for PWM processor.
-//
-
-#include <stdint.h>
-#include <string.h>
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <avr/wdt.h>
-#include <avr/pgmspace.h>
-#include <avr/eeprom.h>
-#include <avr/boot.h>
-
-#include "../df10ch_common.h"
-#include "../df10ch_usb_proto.h"
-
-
-// ---
-// Fuse-Bit settings for the flash programmer (Atmega 162):
-//
-// M161C=1
-// BODLEVEL2=1
-// BODLEVEL1=0
-// BODLEVEL0=0
-//
-// OCDEN=1
-// JTAGEN=1
-// SPIEN=0
-// WDTON=0
-// EESAVE=1
-// BOOTSZ1=0
-// BOOTSZ0=0
-// BOOTRST=0
-//
-// CKDIV8=1
-// CKOUT=1
-// SUT1=0
-// SUT0=1
-// CKSEL3=1
-// CKSEL2=1
-// CKSEL1=1
-// CKSEL0=1
-//
-// Memory-Lock Bits:
-// BLB12=1, BLB11=0, BLB02=1, BLB01=1, LB2=1, LB1=1
-//
-FUSES =
-{
- .low = (FUSE_SUT1),
- .high = (FUSE_SPIEN & FUSE_WDTON & FUSE_BOOTSZ1 & FUSE_BOOTSZ0 & FUSE_BOOTRST),
- .extended = (FUSE_BODLEVEL1 & FUSE_BODLEVEL0),
-};
-LOCKBITS = (LB_MODE_1 & BLB0_MODE_1 & BLB1_MODE_2);
-//SIGNATURE_DATA = { SIGNATURE_2, SIGNATURE_1, SIGNATURE_0 } ;
-
-
-// ---
-// System clock related.
-// System clock is implemented with hardware timer 0
-//
-#define SYS_HWPRESCALE 64 // Hardware Prescaler
-#define SYS_PRESCALER 256 // Timer Prescaler
-
- // useconds <-> timer ticks conversation
-#define US2TICKS(t) ((uint16_t)((double)(t) * (double)F_CPU / (1000000.0 * (double)SYS_HWPRESCALE * (double)SYS_PRESCALER) + 0.5))
-#define TICKS2US(t) (((t) / (F_CPU / (1000000UL * SYS_HWPRESCALE * SYS_PRESCALER))))
-
-static uint16_t sys_clock;
-
-
-// ---
-// Keep alive reply related
-//
-#define MIN_KEEP_ALIVE_PAUSE US2TICKS(15000)
-
-static uint16_t last_keep_alive;
-
-
-// ---
-// Request parser related variables
-//
-typedef union
-{
- uint8_t bytes[REQ_HEADER_SIZE];
- struct
- {
- uint8_t request_type;
- uint8_t request;
- bytes_word_t value;
- bytes_word_t index;
- bytes_word_t length;
- };
-} pwm_request_t;
-
-static pwm_request_t actual_req;
-static uint8_t header_pos;
-static uint8_t payload_pos;
-static uint8_t payload_count;
-
-
-// ---
-// RX buffer related variables
-//
-#define RXBUF_SIZE (REQ_HEADER_SIZE + MAX_REQ_PAYLOAD_SIZE + 1)
-#if RXBUF_SIZE == 256
-#define CHECK_RXBUF_END(pos)
-#else
-#define CHECK_RXBUF_END(pos) if ((pos) == RXBUF_SIZE) (pos) = 0
-#endif
-
-static uint8_t volatile rxrpos, rxwpos, rxspos, rx_err_status;
-static uint8_t rxbuf[RXBUF_SIZE] NOMEMINIT;
-
-
-// Status LED related
-#define STATUS_LED_PORT PORTE
-#define STATUS_LED_BIT 1
-
-// Input pin for enable/disable of bootloader
-#define BL_SENSE_PIN PINE
-#define BL_SENSE_BIT 0
-
-#define APPL_START_VECT 0x0000
-
-// ---
-// Definition of port direction and initial values.
-//
-#define PE_DDR _BV(STATUS_LED_BIT)
-#define PE_INIT _BV(BL_SENSE_BIT)
-
-
-// ---
-// ISR handler for IRQ's that do not have a dedicated handler.
-//
-EMPTY_INTERRUPT(BADISR_vect)
-
-
-// ---
-// ISR for receiving data.
-//
-ISR(USART0_RXC_vect)
-{
- do
- {
- uint8_t i = rxwpos;
- uint8_t p = i + 1;
- CHECK_RXBUF_END(p);
-
- if (bit_is_set(UCSR0A, FE0))
- set_bit(rx_err_status, COMM_ERR_FRAME);
- else if (bit_is_set(UCSR0A, DOR0))
- set_bit(rx_err_status, COMM_ERR_OVERRUN);
- else if (p == rxrpos)
- set_bit(rx_err_status, COMM_ERR_OVERFLOW);
- else
- {
- if (bit_is_set(UCSR0B, RXB80))
- rxspos = i; // save start of request message
- rxwpos = p; // set data valid
- }
- rxbuf[i] = UDR0; // read data
- }
- while (bit_is_set(UCSR0A, RXC0));
-}
-
-
-// ---
-// Processing while waiting for a event.
-//
-static void background_processing(void)
-{
- wdt_reset();
-
- // count system clock
- if (bit_is_set(TIFR, TOV0))
- {
- ++sys_clock;
- TIFR = _BV(TOV0);
- }
-}
-
-
-// ---
-// Put data into transmit buffer.
-//
-static void send_reply_data(uint8_t c)
-{
- // Wait until transmit buffer free
- while (bit_is_clear(UCSR0A, UDRE0))
- background_processing();
-
- UDR0 = c;
-}
-
-
-// ---
-// Send reply start.
-//
-static void send_reply_start(uint8_t len)
-{
- // Wait until transmit buffer free
- while (bit_is_clear(UCSR0A, UDRE0))
- background_processing();
-
- uint8_t id = actual_req.request_type & PWMRQ_ID_MASK;
- if (len)
- id |= PWMRP_HAS_PAYLOAD;
-
- set_bit(UCSR0B, TXB80); // Set 9th bit for start of reply
- UDR0 = id; // Send reply id
- clear_bit(UCSR0B, TXB80);
-
- if (len)
- send_reply_data(len); // Send reply length
-
- last_keep_alive = sys_clock;
-}
-
-
-// ---
-// Send keep alive reply.
-//
-static void send_keep_alive_reply(void)
-{
- background_processing();
- if ((sys_clock - last_keep_alive) > MIN_KEEP_ALIVE_PAUSE)
- {
- // Wait until transmit buffer free
- while (bit_is_clear(UCSR0A, UDRE0))
- background_processing();
-
- set_bit(UCSR0B, TXB80); // Set 9th bit for start of reply
- UDR0 = PWMRP_KEEP_ALIVE; // Send keep alive ID
- clear_bit(UCSR0B, TXB80);
-
- last_keep_alive = sys_clock;
- }
-}
-
-
-// ---
-// Send reply packet from flash memory.
-//
-static void send_reply_read_flash(PGM_P p, uint16_t n)
-{
- if (n > MAX_REPLY_PAYLOAD_SIZE)
- n = 0; // Send nothing!
-
- send_reply_start((uint8_t)n);
-
- while (n)
- {
- send_reply_data(pgm_read_byte(p));
- ++p;
- --n;
- }
-}
-
-
-// ---
-// Process write flash page request.
-//
-static void req_write_flash_page(uint16_t page_address, uint16_t len)
-{
- while (!eeprom_is_ready())
- send_keep_alive_reply();
-
- cli();
- boot_page_erase(page_address);
- sei();
-
- while (boot_spm_busy())
- send_keep_alive_reply();
-
- uint8_t page_offset = 0;
- uint8_t p = payload_pos;
- while (len > 1 && page_offset < SPM_PAGESIZE)
- {
- bytes_word_t v;
- v.bytes[0] = rxbuf[p++];
- CHECK_RXBUF_END(p);
- v.bytes[1] = rxbuf[p++];
- CHECK_RXBUF_END(p);
-
- cli();
- boot_page_fill(page_address + page_offset, v.word);
- sei();
-
- page_offset += 2;
- len -= 2;
- }
-
- cli();
- boot_page_write(page_address);
- sei();
-
- while (boot_spm_busy())
- send_keep_alive_reply();
-
- if (boot_rww_busy())
- boot_rww_enable();
-}
-
-
-// ---
-// Process received request.
-//
-static void process_request(void)
-{
- pwm_request_t *r = &actual_req;
- FIX_POINTER(r);
-
- uint8_t req = r->request;
-
- if (req == BL_PWM_REQ_WRITE_PAGE)
- req_write_flash_page(r->index.word, r->length.word);
- else if (req == BL_PWM_REQ_READ_FLASH)
- {
- send_reply_read_flash((PGM_P) r->index.word, r->length.word);
- return;
- }
- else if (req == BL_PWM_REQ_GET_PAGE_SIZE)
- {
- send_reply_start(2);
- send_reply_data(SPM_PAGESIZE & 0xFF);
- send_reply_data(SPM_PAGESIZE >> 8);
- return;
- }
- else if (req == BL_PWM_REQ_GET_REQUEST_ERR_STATUS)
- {
- send_reply_start(1);
- send_reply_data(rx_err_status);
- rx_err_status = 0;
- return;
- }
- else if (req == PWM_REQ_GET_VERSION)
- {
- send_reply_start(2);
- send_reply_data(PWM_VERS_BOOT);
- send_reply_data(FIRMWARE_VERSION);
- return;
- }
-
- send_reply_start(0);
-}
-
-
-// ---
-// Decode data byte of received data.
-//
-static void read_data(void)
-{
- uint8_t p, c, is_req_start;
-
- // Read data from RX buffer
- p = rxrpos;
- is_req_start = (p == rxspos);
- c = rxbuf[p++];
- CHECK_RXBUF_END(p);
- rxrpos = p;
-
- p = header_pos;
- if (is_req_start)
- {
- if (p)
- set_bit(rx_err_status, COMM_ERR_TIMEOUT);
-
- p = 0;
- }
- else if (!p)
- return; // Discard garbage
-
- if (p < sizeof(pwm_request_t))
- {
- pwm_request_t *r = &actual_req;
- FIX_POINTER(r);
-
- r->bytes[p++] = c;
- header_pos = p;
-
- if (p < sizeof(pwm_request_t))
- return;
-
- // Header complete
- if (!(r->request_type & PWMRQ_DEVICE_TO_HOST) && r->length.word)
- {
- payload_pos = rxrpos;
- payload_count = r->length.word;
- return;
- }
- }
- else if (--payload_count)
- return; // Payload not complete
-
- last_keep_alive = sys_clock;
- process_request();
- header_pos = 0;
-}
-
-
-// ---
-// Device initialization and main program loop.
-//
-void main(void) NORETURN;
-void main(void)
-{
- wdt_enable(WDTO_30MS); // Set watchdog timeout
-
- // Port init, enable pull-up resistors for unused ports
- PORTE = PE_INIT;
- DDRE = PE_DDR;
-
- if ((pgm_read_word(APPL_START_VECT) != 0xFFFF) && // Application reset vector programmed?
- bit_is_set(BL_SENSE_PIN, BL_SENSE_BIT))
- { // boot loader disabled -> start application
- void (*jump_to_app)(void) = APPL_START_VECT / 2; // Need flash word address!
- jump_to_app();
- }
-
- GICR = _BV(IVCE); // enable change of interrupt vectors
- GICR = _BV(IVSEL); // move interrupts to boot flash section
-
- // USART init
- // 9 data bits, 1 stop bit, no parity, asynchron mode
- // Enable TX, RX and RX Interrupts
-#include <util/setbaud.h>
- UBRR0H = UBRRH_VALUE;
- UBRR0L = UBRRL_VALUE;
-#if USE_2X
- UCSR0A = _BV(U2X);
-#endif
- UCSR0C = _BV(URSEL0) | _BV(UCSZ01) | _BV(UCSZ00);
- UCSR0B = _BV(RXEN0) | _BV(TXEN0) | _BV(RXCIE0) | _BV(UCSZ02);
-
- // Timer 0 is used for system clock
- // Normal mode, Prescaler 64
- TCCR0 = _BV(CS01) | _BV(CS00);
-
- sei();
-
- // Main loop
- for (;;)
- {
- background_processing();
-
- if (rxrpos != rxwpos)
- read_data();
-
- if (header_pos)
- clear_bit(STATUS_LED_PORT, STATUS_LED_BIT); // We are processing a request
- else
- set_bit(STATUS_LED_PORT, STATUS_LED_BIT); // No request
- }
-}
+/*
+ * Copyright (C) 2010 Andreas Auras
+ *
+ * This file is part of the DF10CH Atmolight controller project.
+ *
+ * DF10CH Atmolight controller 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.
+ *
+ * DF10CH Atmolight controller 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 Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ */
+
+// ======================================================================
+// Bootloader firmware for PWM processor.
+//
+
+#include <stdint.h>
+#include <string.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+#include <avr/pgmspace.h>
+#include <avr/eeprom.h>
+#include <avr/boot.h>
+
+#include "../df10ch_common.h"
+#include "../df10ch_usb_proto.h"
+
+
+// ---
+// Fuse-Bit settings for the flash programmer (Atmega 162):
+//
+// M161C=1
+// BODLEVEL2=1
+// BODLEVEL1=0
+// BODLEVEL0=0
+//
+// OCDEN=1
+// JTAGEN=1
+// SPIEN=0
+// WDTON=0
+// EESAVE=1
+// BOOTSZ1=0
+// BOOTSZ0=0
+// BOOTRST=0
+//
+// CKDIV8=1
+// CKOUT=1
+// SUT1=0
+// SUT0=1
+// CKSEL3=1
+// CKSEL2=1
+// CKSEL1=1
+// CKSEL0=1
+//
+// Memory-Lock Bits:
+// BLB12=1, BLB11=0, BLB02=1, BLB01=1, LB2=1, LB1=1
+//
+FUSES =
+{
+ .low = (FUSE_SUT1),
+ .high = (FUSE_SPIEN & FUSE_WDTON & FUSE_BOOTSZ1 & FUSE_BOOTSZ0 & FUSE_BOOTRST),
+ .extended = (FUSE_BODLEVEL1 & FUSE_BODLEVEL0),
+};
+LOCKBITS = (LB_MODE_1 & BLB0_MODE_1 & BLB1_MODE_2);
+//SIGNATURE_DATA = { SIGNATURE_2, SIGNATURE_1, SIGNATURE_0 } ;
+
+
+// ---
+// System clock related.
+// System clock is implemented with hardware timer 0
+//
+#define SYS_HWPRESCALE 64 // Hardware Prescaler
+#define SYS_PRESCALER 256 // Timer Prescaler
+
+ // useconds <-> timer ticks conversation
+#define US2TICKS(t) ((uint16_t)((double)(t) * (double)F_CPU / (1000000.0 * (double)SYS_HWPRESCALE * (double)SYS_PRESCALER) + 0.5))
+#define TICKS2US(t) (((t) / (F_CPU / (1000000UL * SYS_HWPRESCALE * SYS_PRESCALER))))
+
+static uint16_t sys_clock;
+
+
+// ---
+// Keep alive reply related
+//
+#define MIN_KEEP_ALIVE_PAUSE US2TICKS(15000)
+
+static uint16_t last_keep_alive;
+
+
+// ---
+// Request parser related variables
+//
+typedef union
+{
+ uint8_t bytes[REQ_HEADER_SIZE];
+ struct
+ {
+ uint8_t request_type;
+ uint8_t request;
+ bytes_word_t value;
+ bytes_word_t index;
+ bytes_word_t length;
+ };
+} pwm_request_t;
+
+static pwm_request_t actual_req;
+static uint8_t header_pos;
+static uint8_t payload_pos;
+static uint8_t payload_count;
+
+
+// ---
+// RX buffer related variables
+//
+#define RXBUF_SIZE (REQ_HEADER_SIZE + MAX_REQ_PAYLOAD_SIZE + 1)
+#if RXBUF_SIZE == 256
+#define CHECK_RXBUF_END(pos)
+#else
+#define CHECK_RXBUF_END(pos) if ((pos) == RXBUF_SIZE) (pos) = 0
+#endif
+
+static uint8_t volatile rxrpos, rxwpos, rxspos, rx_err_status;
+static uint8_t rxbuf[RXBUF_SIZE] NOMEMINIT;
+
+
+// Status LED related
+#define STATUS_LED_PORT PORTE
+#define STATUS_LED_BIT 1
+
+// Input pin for enable/disable of bootloader
+#define BL_SENSE_PIN PINE
+#define BL_SENSE_BIT 0
+
+#define APPL_START_VECT 0x0000
+
+// ---
+// Definition of port direction and initial values.
+//
+#define PE_DDR _BV(STATUS_LED_BIT)
+#define PE_INIT _BV(BL_SENSE_BIT)
+
+
+// ---
+// ISR handler for IRQ's that do not have a dedicated handler.
+//
+EMPTY_INTERRUPT(BADISR_vect)
+
+
+// ---
+// ISR for receiving data.
+//
+ISR(USART0_RXC_vect)
+{
+ do
+ {
+ uint8_t i = rxwpos;
+ uint8_t p = i + 1;
+ CHECK_RXBUF_END(p);
+
+ if (bit_is_set(UCSR0A, FE0))
+ set_bit(rx_err_status, COMM_ERR_FRAME);
+ else if (bit_is_set(UCSR0A, DOR0))
+ set_bit(rx_err_status, COMM_ERR_OVERRUN);
+ else if (p == rxrpos)
+ set_bit(rx_err_status, COMM_ERR_OVERFLOW);
+ else
+ {
+ if (bit_is_set(UCSR0B, RXB80))
+ rxspos = i; // save start of request message
+ rxwpos = p; // set data valid
+ }
+ rxbuf[i] = UDR0; // read data
+ }
+ while (bit_is_set(UCSR0A, RXC0));
+}
+
+
+// ---
+// Processing while waiting for a event.
+//
+static void background_processing(void)
+{
+ wdt_reset();
+
+ // count system clock
+ if (bit_is_set(TIFR, TOV0))
+ {
+ ++sys_clock;
+ TIFR = _BV(TOV0);
+ }
+}
+
+
+// ---
+// Put data into transmit buffer.
+//
+static void send_reply_data(uint8_t c)
+{
+ // Wait until transmit buffer free
+ while (bit_is_clear(UCSR0A, UDRE0))
+ background_processing();
+
+ UDR0 = c;
+}
+
+
+// ---
+// Send reply start.
+//
+static void send_reply_start(uint8_t len)
+{
+ // Wait until transmit buffer free
+ while (bit_is_clear(UCSR0A, UDRE0))
+ background_processing();
+
+ uint8_t id = actual_req.request_type & PWMRQ_ID_MASK;
+ if (len)
+ id |= PWMRP_HAS_PAYLOAD;
+
+ set_bit(UCSR0B, TXB80); // Set 9th bit for start of reply
+ UDR0 = id; // Send reply id
+ clear_bit(UCSR0B, TXB80);
+
+ if (len)
+ send_reply_data(len); // Send reply length
+
+ last_keep_alive = sys_clock;
+}
+
+
+// ---
+// Send keep alive reply.
+//
+static void send_keep_alive_reply(void)
+{
+ background_processing();
+ if ((sys_clock - last_keep_alive) > MIN_KEEP_ALIVE_PAUSE)
+ {
+ // Wait until transmit buffer free
+ while (bit_is_clear(UCSR0A, UDRE0))
+ background_processing();
+
+ set_bit(UCSR0B, TXB80); // Set 9th bit for start of reply
+ UDR0 = PWMRP_KEEP_ALIVE; // Send keep alive ID
+ clear_bit(UCSR0B, TXB80);
+
+ last_keep_alive = sys_clock;
+ }
+}
+
+
+// ---
+// Send reply packet from flash memory.
+//
+static void send_reply_read_flash(PGM_P p, uint16_t n)
+{
+ if (n > MAX_REPLY_PAYLOAD_SIZE)
+ n = 0; // Send nothing!
+
+ send_reply_start((uint8_t)n);
+
+ while (n)
+ {
+ send_reply_data(pgm_read_byte(p));
+ ++p;
+ --n;
+ }
+}
+
+
+// ---
+// Process write flash page request.
+//
+static void req_write_flash_page(uint16_t page_address, uint16_t len)
+{
+ while (!eeprom_is_ready())
+ send_keep_alive_reply();
+
+ cli();
+ boot_page_erase(page_address);
+ sei();
+
+ while (boot_spm_busy())
+ send_keep_alive_reply();
+
+ uint8_t page_offset = 0;
+ uint8_t p = payload_pos;
+ while (len > 1 && page_offset < SPM_PAGESIZE)
+ {
+ bytes_word_t v;
+ v.bytes[0] = rxbuf[p++];
+ CHECK_RXBUF_END(p);
+ v.bytes[1] = rxbuf[p++];
+ CHECK_RXBUF_END(p);
+
+ cli();
+ boot_page_fill(page_address + page_offset, v.word);
+ sei();
+
+ page_offset += 2;
+ len -= 2;
+ }
+
+ cli();
+ boot_page_write(page_address);
+ sei();
+
+ while (boot_spm_busy())
+ send_keep_alive_reply();
+
+ if (boot_rww_busy())
+ boot_rww_enable();
+}
+
+
+// ---
+// Process received request.
+//
+static void process_request(void)
+{
+ pwm_request_t *r = &actual_req;
+ FIX_POINTER(r);
+
+ uint8_t req = r->request;
+
+ if (req == BL_PWM_REQ_WRITE_PAGE)
+ req_write_flash_page(r->index.word, r->length.word);
+ else if (req == BL_PWM_REQ_READ_FLASH)
+ {
+ send_reply_read_flash((PGM_P) r->index.word, r->length.word);
+ return;
+ }
+ else if (req == BL_PWM_REQ_GET_PAGE_SIZE)
+ {
+ send_reply_start(2);
+ send_reply_data(SPM_PAGESIZE & 0xFF);
+ send_reply_data(SPM_PAGESIZE >> 8);
+ return;
+ }
+ else if (req == BL_PWM_REQ_GET_REQUEST_ERR_STATUS)
+ {
+ send_reply_start(1);
+ send_reply_data(rx_err_status);
+ rx_err_status = 0;
+ return;
+ }
+ else if (req == PWM_REQ_GET_VERSION)
+ {
+ send_reply_start(2);
+ send_reply_data(PWM_VERS_BOOT);
+ send_reply_data(FIRMWARE_VERSION);
+ return;
+ }
+
+ send_reply_start(0);
+}
+
+
+// ---
+// Decode data byte of received data.
+//
+static void read_data(void)
+{
+ uint8_t p, c, is_req_start;
+
+ // Read data from RX buffer
+ p = rxrpos;
+ is_req_start = (p == rxspos);
+ c = rxbuf[p++];
+ CHECK_RXBUF_END(p);
+ rxrpos = p;
+
+ p = header_pos;
+ if (is_req_start)
+ {
+ if (p)
+ set_bit(rx_err_status, COMM_ERR_TIMEOUT);
+
+ p = 0;
+ }
+ else if (!p)
+ return; // Discard garbage
+
+ if (p < sizeof(pwm_request_t))
+ {
+ pwm_request_t *r = &actual_req;
+ FIX_POINTER(r);
+
+ r->bytes[p++] = c;
+ header_pos = p;
+
+ if (p < sizeof(pwm_request_t))
+ return;
+
+ // Header complete
+ if (!(r->request_type & PWMRQ_DEVICE_TO_HOST) && r->length.word)
+ {
+ payload_pos = rxrpos;
+ payload_count = r->length.word;
+ return;
+ }
+ }
+ else if (--payload_count)
+ return; // Payload not complete
+
+ last_keep_alive = sys_clock;
+ process_request();
+ header_pos = 0;
+}
+
+
+// ---
+// Device initialization and main program loop.
+//
+void main(void) NORETURN;
+void main(void)
+{
+ wdt_enable(WDTO_30MS); // Set watchdog timeout
+
+ // Port init, enable pull-up resistors for unused ports
+ PORTE = PE_INIT;
+ DDRE = PE_DDR;
+
+ if ((pgm_read_word(APPL_START_VECT) != 0xFFFF) && // Application reset vector programmed?
+ bit_is_set(BL_SENSE_PIN, BL_SENSE_BIT))
+ { // boot loader disabled -> start application
+ void (*jump_to_app)(void) = APPL_START_VECT / 2; // Need flash word address!
+ jump_to_app();
+ }
+
+ GICR = _BV(IVCE); // enable change of interrupt vectors
+ GICR = _BV(IVSEL); // move interrupts to boot flash section
+
+ // USART init
+ // 9 data bits, 1 stop bit, no parity, asynchron mode
+ // Enable TX, RX and RX Interrupts
+#include <util/setbaud.h>
+ UBRR0H = UBRRH_VALUE;
+ UBRR0L = UBRRL_VALUE;
+#if USE_2X
+ UCSR0A = _BV(U2X);
+#endif
+ UCSR0C = _BV(URSEL0) | _BV(UCSZ01) | _BV(UCSZ00);
+ UCSR0B = _BV(RXEN0) | _BV(TXEN0) | _BV(RXCIE0) | _BV(UCSZ02);
+
+ // Timer 0 is used for system clock
+ // Normal mode, Prescaler 64
+ TCCR0 = _BV(CS01) | _BV(CS00);
+
+ sei();
+
+ // Main loop
+ for (;;)
+ {
+ background_processing();
+
+ if (rxrpos != rxwpos)
+ read_data();
+
+ if (header_pos)
+ clear_bit(STATUS_LED_PORT, STATUS_LED_BIT); // We are processing a request
+ else
+ set_bit(STATUS_LED_PORT, STATUS_LED_BIT); // No request
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-24 08:43:25 +0000