IEEE 802.15.4 subsystem
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| Source at commit b0a3001ca23e9ba9a0d004b9971563cc5ef659ea created 7 years 3 months ago. By Werner Almesberger, atusb/atusb.kicad_pcb (C15): resolve silk screen on pad; add via | |
|---|---|
| 1 | /* |
| 2 | * fw/flash.c - Board-specific flash functions |
| 3 | * |
| 4 | * Written 2011, 2013-2015 by Werner Almesberger |
| 5 | * Copyright 2011, 2013-2015 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #include <stdbool.h> |
| 15 | #include <stdint.h> |
| 16 | |
| 17 | #include <avr/boot.h> |
| 18 | #include <avr/pgmspace.h> |
| 19 | |
| 20 | #include "dfu.h" |
| 21 | #include "board.h" |
| 22 | |
| 23 | |
| 24 | static uint32_t payload; |
| 25 | |
| 26 | |
| 27 | static void flash_start(void) |
| 28 | { |
| 29 | payload = 0; |
| 30 | } |
| 31 | |
| 32 | |
| 33 | static bool flash_can_write(uint16_t size) |
| 34 | { |
| 35 | return payload+size <= BOOT_ADDR; |
| 36 | } |
| 37 | |
| 38 | |
| 39 | static void flash_write(const uint8_t *buf, uint16_t size) |
| 40 | { |
| 41 | static uint8_t last; |
| 42 | const uint8_t *p; |
| 43 | |
| 44 | for (p = buf; p != buf+size; p++) { |
| 45 | if (!(payload & (SPM_PAGESIZE-1))) { |
| 46 | boot_page_erase(payload); |
| 47 | boot_spm_busy_wait(); |
| 48 | } |
| 49 | |
| 50 | if (payload & 1) |
| 51 | boot_page_fill(payload, last | (*p << 8)); |
| 52 | else |
| 53 | last = *p; |
| 54 | payload++; |
| 55 | |
| 56 | if (!(payload & (SPM_PAGESIZE-1))) { |
| 57 | boot_page_write(payload-SPM_PAGESIZE); |
| 58 | boot_spm_busy_wait(); |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | |
| 64 | static void flash_end_write(void) |
| 65 | { |
| 66 | if (payload & (SPM_PAGESIZE-1)) { |
| 67 | boot_page_write(payload & ~(SPM_PAGESIZE-1)); |
| 68 | boot_spm_busy_wait(); |
| 69 | } |
| 70 | boot_rww_enable(); |
| 71 | } |
| 72 | |
| 73 | |
| 74 | static uint16_t flash_read(uint8_t *buf, uint16_t size) |
| 75 | { |
| 76 | uint16_t got = 0; |
| 77 | |
| 78 | while (size && payload != (uint32_t) FLASHEND+1) { |
| 79 | *buf++ = pgm_read_byte(payload); |
| 80 | payload++; |
| 81 | size--; |
| 82 | got++; |
| 83 | } |
| 84 | return got; |
| 85 | } |
| 86 | |
| 87 | |
| 88 | static const struct dfu_flash_ops flash_ops = { |
| 89 | .start = flash_start, |
| 90 | .can_write = flash_can_write, |
| 91 | .write = flash_write, |
| 92 | .end_write = flash_end_write, |
| 93 | .read = flash_read, |
| 94 | }; |
| 95 | |
| 96 | |
| 97 | const struct dfu_flash_ops *dfu_flash_ops = &flash_ops; |
| 98 | |
