Mouse code for the MacroRat
Diff: mbed-dev/hal/TARGET_FLASH_CMSIS_ALGO/flash_common_algo.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/hal/TARGET_FLASH_CMSIS_ALGO/flash_common_algo.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,169 @@ +/* mbed Microcontroller Library + * Copyright (c) 2017 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "flash_api.h" +#include "flash_data.h" +#include "mbed_critical.h" + +#define MBED_FLASH_ALGO_ERASE 1UL +#define MBED_FLASH_ALGO_PROGRAM 2UL + +extern uint32_t SystemCoreClock; + +/* + This binary blob (thumb code) sets r9 (static base) as the code we are jumping to + is PIC (position independent code). + + These are the instructions (r0 is a pointer to arg_t): + push {r5, lr, r4} + mov r5, r9 + push {r5} + ldr r5, [r0, #20] + ldr r3, [r0, #16] + mov r9, r3 + ldr r3, [r0, #12] + ldr r2, [r0, #8] + ldr r1, [r0, #4] + ldr r0, [r0, #0] + blx r5 + pop {r5} + mov r9, r5 + pop {r4-r5, pc} + bx r14 +*/ +static uint32_t jump_to_flash_algo[] = { + 0x464DB530, + 0x6945B420, + 0x46996903, + 0x688268C3, + 0x68006841, + 0xBC2047A8, + 0xBD3046A9 +}; + +// should be called within critical section +static int32_t flash_algo_init(flash_t *obj, uint32_t address, uint32_t function) +{ + args_t arguments = { + .r0 = address, + .r1 = SystemCoreClock, + .r2 = function, + .r3 = 0, + .r9 = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->static_base, + .pc = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->init + }; + return ((flash_algo_jump_t)(((uint32_t)&jump_to_flash_algo) | 1))(&arguments); +} + +// should be called within critical section +static int32_t flash_algo_uninit(flash_t *obj, uint32_t address, uint32_t function) +{ + args_t arguments = { + .r0 = address, + .r1 = SystemCoreClock, + .r2 = function, + .r3 = 0, + .r9 = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->static_base, + .pc = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->uninit + }; + return ((flash_algo_jump_t)(((uint32_t)&jump_to_flash_algo) | 1))(&arguments); +} + + +int32_t flash_init(flash_t *obj) +{ + flash_set_target_config(obj); + return 0; +} + +int32_t flash_free(flash_t *obj) +{ + return 0; +} + +int32_t flash_erase_sector(flash_t *obj, uint32_t address) +{ + core_util_critical_section_enter(); + flash_algo_init(obj, address, MBED_FLASH_ALGO_ERASE); + + args_t arguments = { + .r0 = address, + .r1 = 0, + .r2 = 0, + .r3 = 0, + .r9 = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->static_base, + .pc = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->erase_sector + }; + int32_t ret = ((flash_algo_jump_t)(((uint32_t)&jump_to_flash_algo) | 1))(&arguments); + + flash_algo_uninit(obj, address, MBED_FLASH_ALGO_ERASE); + core_util_critical_section_exit(); + return ret ? -1 : 0; +} + + +int32_t flash_program_page(flash_t *obj, uint32_t address, const uint8_t *data, uint32_t size) +{ + core_util_critical_section_enter(); + flash_algo_init(obj, address, MBED_FLASH_ALGO_PROGRAM); + + args_t arguments = { + .r0 = address, + .r1 = size, + .r2 = (uint32_t)data, + .r3 = 0, + .r9 = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->static_base, + .pc = (uint32_t)obj->flash_algo->algo_blob + obj->flash_algo->program_page + }; + int32_t ret = ((flash_algo_jump_t)(((uint32_t)&jump_to_flash_algo) | 1))(&arguments); + + flash_algo_uninit(obj, address, MBED_FLASH_ALGO_PROGRAM); + core_util_critical_section_exit(); + return ret ? -1 : 0; +} + + +uint32_t flash_get_sector_size(const flash_t *obj, uint32_t address) +{ + const sector_info_t *sectors = obj->target_config->sectors; + + if (address >= obj->target_config->flash_start + obj->target_config->flash_size) { + return MBED_FLASH_INVALID_SIZE; + } + + int sector_index = obj->target_config->sector_info_count - 1; + for (; sector_index >= 0; sector_index--) { + if (address >= sectors[sector_index].start) { + return sectors[sector_index].size; + } + } + return MBED_FLASH_INVALID_SIZE; +} + +uint32_t flash_get_page_size(const flash_t *obj) +{ + return obj->target_config->page_size; +} + +uint32_t flash_get_start_address(const flash_t *obj) +{ + return obj->target_config->flash_start; +} + +uint32_t flash_get_size(const flash_t *obj) +{ + return obj->target_config->flash_size; +}