+++ /dev/null
-/* vim:ts=4 sts=4 et tw=80
- *
- * fnordlichtmini serial bootloader
- *
- * for additional information please
- * see http://lochraster.org/fnordlichtmini
- *
- * (c) by Alexander Neumann <alexander@bumpern.de>
- * Lars Noschinski <lars@public.noschinski.de>
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 3 as published by
- * the Free Software Foundation.
- *
- * 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, see <http://www.gnu.org/licenses/>.
- */
-
-#include <avr/io.h>
-#include <avr/boot.h>
-#include <avr/wdt.h>
-#include <avr/pgmspace.h>
-#include <util/delay.h>
-#include <util/crc16.h>
-#include <string.h>
-#include <stdbool.h>
-#include "../common/io.h"
-#include "../common/remote-proto.h"
-#include "../common/common.h"
-#include "uart.h"
-#include "global.h"
-
-struct global_t
-{
- /* for bus synchronization */
- uint8_t synced;
- uint8_t sync_len;
-
- /* own device address */
- uint8_t address;
-
- /* for crc checking */
- bool crc_match;
- uint8_t delay;
-
- /* for enter_application command */
- bool request_exit;
- uint8_t exit_delay;
-
- /* for internal message buffer */
- uint8_t len;
- union {
- uint8_t buf[REMOTE_MSG_LEN];
- struct remote_msg_t msg;
- };
-
- /* length and address for data buffer */
- uint16_t data_len;
- uint8_t *data_address;
- union {
- uint8_t data_buf[CONFIG_BOOTLOADER_BUFSIZE];
- uint16_t data_buf16[CONFIG_BOOTLOADER_BUFSIZE/2];
- };
-};
-
-struct global_t __global;
-#define global (&__global)
-
-/* disable watchdog - NEVER CALL DIRECTLY! */
-void disable_watchdog(void) \
- __attribute__((naked)) \
- __attribute__((section(".init3")));
-void disable_watchdog(void)
-{
- MCUSR = 0;
- wdt_disable();
-}
-
-static void (*jump_to_application)(void) = 0;
-
-static void start_application(void) __attribute__((noreturn));
-static void start_application(void)
-{
- /* pwm pins */
- P_PORT = 0;
- P_DDR = 0;
-
- /* in pin */
- R_PORT = 0;
- R_DDR = 0;
-
- /* uart */
- _UBRRH_UART0 = 0;
- _UBRRL_UART0 = 0;
- _UCSRA_UART0 = _BV(_TXC_UART0);
- _UCSRB_UART0 = 0;
-
- /* timer1 */
- TCCR1B = 0;
- OCR1A = 0;
- TCNT1 = 0;
- _TIFR_TIMER1 = _TIFR_TIMER1;
-
- /* move interrupt vectors and start real application */
- jump_to_application();
-}
-
-static void parse_boot_config(struct remote_msg_boot_config_t *msg)
-{
- /* remember flash address */
- global->data_address = (uint8_t *)msg->start_address;
-}
-
-static void parse_data(struct remote_msg_boot_data_t *msg)
-{
- uint8_t len = sizeof(msg->data);
- if (global->data_len + len > CONFIG_BOOTLOADER_BUFSIZE)
- len = CONFIG_BOOTLOADER_BUFSIZE - global->data_len;
-
- memcpy(&global->data_buf[global->data_len], msg->data, len);
- global->data_len += len;
-}
-
-static void parse_crc(struct remote_msg_boot_crc_check_t *msg)
-{
- /* compute crc16 over buffer */
- uint16_t checksum = 0xffff;
-
- uint8_t *ptr = &global->data_buf[0];
- uint16_t i = msg->len+1;
- while (--i)
- checksum = _crc16_update(checksum, *ptr++);
-
- if (checksum != msg->checksum) {
- global->delay = msg->delay;
- global->crc_match = false;
- } else
- global->crc_match = true;
-}
-
-static void parse_crc_flash(struct remote_msg_boot_crc_flash_t *msg)
-{
- /* compute crc16 over flash */
- uint16_t checksum = 0xffff;
-
- uint8_t *address = (uint8_t *)msg->start;
- uint16_t i = msg->len+1;
- while (--i) {
- uint8_t data = pgm_read_byte(address++);
- checksum = _crc16_update(checksum, data);
- }
-
- if (checksum != msg->checksum) {
- global->delay = msg->delay;
- global->crc_match = false;
- } else
- global->crc_match = true;
-}
-
-static void flash(void)
-{
- /* pull int */
- R_DDR |= _BV(INTPIN);
-
- uint8_t *addr = global->data_address;
- uint16_t *data = &global->data_buf16[0];
-
- uint8_t last_page = global->data_len/SPM_PAGESIZE;
- if (global->data_len % SPM_PAGESIZE)
- last_page++;
-
- for (uint8_t page = 0; page < last_page; page++)
- {
- PWM_PIN_ON(PWM_GREEN);
-
- /* erase page */
- boot_page_erase(addr);
- boot_spm_busy_wait();
-
- for (uint16_t i = 0; i < SPM_PAGESIZE; i += 2) {
- /* fill internal buffer */
- boot_page_fill(addr+i, *data++);
- boot_spm_busy_wait();
- }
-
- /* after filling the temp buffer, write the page and wait till we're done */
- boot_page_write(addr);
- boot_spm_busy_wait();
-
- /* re-enable application flash section, so we can read it again */
- boot_rww_enable();
-
- PWM_PIN_OFF(PWM_GREEN);
- addr += SPM_PAGESIZE;
- }
-
- global->data_address = addr;
-
- /* release int */
- R_DDR &= ~_BV(INTPIN);
-}
-
-static void remote_parse_msg(struct remote_msg_t *msg)
-{
- /* verify address */
- if (msg->address != global->address && msg->address != REMOTE_ADDR_BROADCAST)
- return;
-
- /* parse command */
- switch (msg->cmd) {
- case REMOTE_CMD_BOOT_CONFIG: parse_boot_config((struct remote_msg_boot_config_t *)msg);
- break;
- case REMOTE_CMD_BOOT_INIT: global->data_len = 0;
- break;
- case REMOTE_CMD_BOOT_DATA: parse_data((struct remote_msg_boot_data_t *)msg);
- break;
- case REMOTE_CMD_CRC_CHECK: parse_crc((struct remote_msg_boot_crc_check_t *)msg);
- break;
- case REMOTE_CMD_CRC_FLASH: parse_crc_flash((struct remote_msg_boot_crc_flash_t *)msg);
- break;
- case REMOTE_CMD_FLASH: flash();
- break;
- case REMOTE_CMD_ENTER_APP: global->request_exit = true;
- global->exit_delay = CONFIG_EXIT_DELAY;
- break;
- }
-
- if (global->delay && global->crc_match == false) {
- /* pull int to gnd */
- R_DDR |= _BV(INTPIN);
-
- PWM_PIN_ON(PWM_RED);
- }
-}
-
-static void remote_poll(void)
-{
- /* wait for a byte */
- if (uart_receive_complete())
- {
- uint8_t data = uart_getc();
-
- /* check if sync sequence has been received before */
- if (global->sync_len == REMOTE_SYNC_LEN) {
- /* synced, safe address and send next address to following device */
- global->address = data;
- uart_putc(data+1);
-
- /* reset buffer */
- global->len = 0;
-
- /* enable remote command thread */
- global->synced = 1;
- } else {
- /* just pass through data */
- uart_putc(data);
-
- /* put data into remote buffer
- * (just processed if remote.synced == 1) */
- if (global->len < sizeof(global->buf))
- global->buf[global->len++] = data;
- }
-
- /* remember the number of sync bytes received so far */
- if (data == REMOTE_CMD_RESYNC)
- global->sync_len++;
- else
- global->sync_len = 0;
- }
-
- if (global->synced && global->len == REMOTE_MSG_LEN) {
- remote_parse_msg(&global->msg);
- global->len = 0;
- }
-}
-
-static void check_startup(void)
-{
- /* check for valid reset vector */
- if (pgm_read_word(NULL) == 0xffff)
- return;
-
- /* configure pullup resistor at int pin */
- R_PORT |= _BV(INTPIN);
-
- /* sleep 100ms (TCNT1 == 2, -> TCNT1L == 2) */
- while (TCNT1L < 2);
-
- /* if int pin is pulled down, remain in bootloader */
- if (!(R_PIN & _BV(INTPIN)))
- return;
-
- /* else cleanup and start application */
- start_application();
-}
-
-int __attribute__ ((noreturn,OS_main)) main(void)
-{
- /* initialize timer1, CTC at 50ms, prescaler 1024 */
- OCR1A = F_CPU/1024/20;
- TCCR1B = _BV(WGM12) | _BV(CS12) | _BV(CS10);
-
- /* start application if necessary */
- check_startup();
-
- /* configure and enable uart */
- uart_init();
-
- /* configure outputs */
- P_DDR = PWM_CHANNEL_MASK;
-
-#ifdef PWM_INVERTED
- P_PORT = PWM_CHANNEL_MASK;
-#endif
-
- while(1) {
- remote_poll();
-
- if (_TIFR_TIMER1 & _BV(OCF1A)) {
- _TIFR_TIMER1 = _BV(OCF1A);
-
- static uint8_t c;
- if (c++ == 20) {
- /* blink */
- PWM_PIN_TOGGLE(PWM_BLUE);
- c = 0;
- }
-
- /* if int is pulled, decrement delay */
- if (R_DDR & _BV(INTPIN)) {
- if (--global->delay == 0) {
- /* release int */
- R_DDR &= ~_BV(INTPIN);
- P_PORT &= ~1;
- }
- }
-
- /* exit (after exit_delay) if requested */
- if (global->request_exit && global->exit_delay-- == 0)
- start_application();
- }
- }
-}
projects / fnordlicht-mini / blobdiff