MQX的flash读写操作
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发表于 10/23/2015 12:07:30 PM
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很多使用者在次接触MQX的flash例程时，对其中的操作不是很理解，在这里简单总结一下。
硬件：FRDM_K64F
软件；MQX4.1.1
实现的目标：读出地址0x000ff010的内容 并向其写入0x01 数据
步骤：
1)在user_config.h 中
#define BSPCFG_ENABLE_FLASHX 1 // 0->1
重新编译bsp
2)将附件中的c文件加入到工程中
/*HEADER**********************************************************************
*
* Copyright 2008 Freescale Semiconductor, Inc.
* Copyright 1989-2008 ARC International
*
* This software is owned or controlled by Freescale Semiconductor.
* Use of this software is governed by the Freescale MQX RTOS License
* distributed with this Material.
* See the MQX_RTOS_LICENSE file distributed for more details.
*
* Brief License Summary:
* This software is provided in source form for you to use free of charge,
* but it is not open source software. You are allowed to use this software
* but you cannot redistribute it or derivative works of it in source form.
* The software may be used only in connection with a product containing
* a Freescale microprocessor, microcontroller, or digital signal processor.
* See license agreement file for full license terms including other
* restrictions.
*****************************************************************************
*
* Comments:
*
* This file contains the source for the FlashX example program.
*
*
*END************************************************************************/
#include #include #include #if (BSP_M51EMDEMO || BSP_TWRMCF51MM || BSP_TWRMCF51JE)
#if !BSPCFG_ENABLE_FLASHX2
#error This application requires BSPCFG_ENABLE_FLASHX1 defined non-zero in user_config.h. Please recompile BSP with this option.
#endif
#define FLASH_NAME "flashx2:bank1"
#elif BSP_M54455EVB
#if !BSPCFG_ENABLE_FLASHX0
#error This application requires BSPCFG_ENABLE_FLASHX0 defined non-zero in user_config.h. Please recompile BSP with this option.
#endif
#define FLASH_NAME "flashx0:bank0"
#elif PSP_MQX_CPU_IS_VYBRID
#if BSPCFG_ENABLE_FLASHX_QUADSPI0
#define FLASH_NAME "flashx_qspi0:bank0"
#elif BSPCFG_ENABLE_FLASHX_QUADSPI1
#define FLASH_NAME "flashx_qspi1:bank0"
#else
#error This application requires BSPCFG_ENABLE_FLASHX_QUADSPI0/1 defined non-zero in user_config.h. Please recompile BSP with this option.
#endif
#else
#if !BSPCFG_ENABLE_FLASHX
#error This application requires BSPCFG_ENABLE_FLASHX defined non-zero in user_config.h. Please recompile BSP with this option.
#endif
#define FLASH_NAME "flashx:bank3"
#endif
#define STRING_SIZE (32)
#define BUFFER_SIZE (80)
/* function prototypes */
void flash_task(uint32_t);
static char *buffer;
const TASK_TEMPLATE_STRUCT MQX_template_list[] =
{
/* Task Index, Function, Stack, Priority, Name, Attributes, Param, Time Slice */
{ 1, flash_task, 2000, 7, "flash_test", MQX_AUTO_START_TASK, 0, 0 },
{ 0 }
};
void flash_task
(
uint32_t initial_data
)
{
(void) initial_data; /* suppress 'unused variable' warning */
MQX_FILE_PTR flash_file;
_mqx_int i;
_mqx_int len = 0;
uint32_t ioctl_param;
char buffer[10];
/* Open the flash device */
flash_file = fopen(FLASH_NAME, NULL);
if (flash_file == NULL) {
printf("\nUnable to open file %s", FLASH_NAME);
_task_block();
} else {
printf("\nFlash file %s opened", FLASH_NAME);
}
/* Get the size of the flash file */
fseek(flash_file, 0, IO_SEEK_END);
printf("\nSize of the flash file: 0x%x Bytes", ftell(flash_file)); // ftell 用于得到文件位置指针当前位置相对于文件首的偏移字节数。
/* enable sector cache */
ioctl(flash_file, FLASH_IOCTL_ENABLE_SECTOR_CACHE, NULL);
printf("\nFlash sector cache enabled.");
fseek(flash_file, 0x000ff010-0x000c0000, IO_SEEK_SET); // 移动位置指针
len = read(flash_file, buffer, 1);
printf("\r\nRead content = %x",buffer[0]); // 打印读到的数据
fseek(flash_file, 0x000ff010-0x000c0000, IO_SEEK_SET); // 移动位置指针
buffer[0]=0x01;
/* Unprotecting the the FLASH might be required */
ioctl_param = 0;
ioctl(flash_file, FLASH_IOCTL_WRITE_PROTECT, &ioctl_param);
len = write(flash_file, buffer, 1);
if (len != 1) {
printf("\nError writing to the file. Error code: %d", _io_ferror(flash_file));
}
else {
printf("\nData written to the flash.\nNow you can power down and power up your device");
printf("\nand then retry the test to see if the string was written correctly.");
}
fclose(flash_file);
printf("\nFlash example finished.");
_task_block();
}3）在线调试，观察实验现象
刚开始0x000ff010地址内容为0xff
当执行完write函数后，内容变为0x01
可以将板子断电重新上电，然读出该地址的值，发现其为0x01
说明：
1）读写只需要调用write和read函数，不需要单独进行擦除操作，因为在write函数里实现了擦除。
2）FRDM_K64F上的芯片是1M Flash的，MQX中将其分为了4分bank，
bank0地址范围：0x00000000-0x0003FFFF
bank1地址范围：0x00040000-0x0007FFFF
bank2地址范围：0x00080000-0x000BFFFF
bank3地址范围：0x000C0000-0x000FFFFF
本例子中操作的地址0x000ff010在bank3范围内。
const FLASHX_FILE_BLOCK _bsp_flashx_file_blocks[] = {
{ "bank0", BSP_INTERNAL_FLASH_BASE, BSP_INTERNAL_FLASH_BASE + 1 * (BSP_INTERNAL_FLASH_SIZE / 4) - 1 },
{ "bank1", BSP_INTERNAL_FLASH_BASE + 1 * (BSP_INTERNAL_FLASH_SIZE / 4), BSP_INTERNAL_FLASH_BASE + 2 * (BSP_INTERNAL_FLASH_SIZE / 4) - 1 },
{ "bank2", BSP_INTERNAL_FLASH_BASE + 2 * (BSP_INTERNAL_FLASH_SIZE / 4), BSP_INTERNAL_FLASH_BASE + 3 * (BSP_INTERNAL_FLASH_SIZE / 4) - 1 },
{ "bank3", BSP_INTERNAL_FLASH_BASE + 3 * (BSP_INTERNAL_FLASH_SIZE / 4), BSP_INTERNAL_FLASH_BASE + 4 * (BSP_INTERNAL_FLASH_SIZE / 4) - 1 },
/* swap file definition according to the default value of BSPCFG_SWAP_INDICATOR_ADDR and sector size */
{ "swap0", BSP_INTERNAL_FLASH_BASE, BSP_INTERNAL_FLASH_BASE + (BSP_INTERNAL_FLASH_SIZE / 2) - (1 + BSP_INTERNAL_FLASH_SECTOR_SIZE) },
{ "swap1", BSP_INTERNAL_FLASH_BASE + (BSP_INTERNAL_FLASH_SIZE / 2), BSP_INTERNAL_FLASH_BASE + (BSP_INTERNAL_FLASH_SIZE ) - (1 + BSP_INTERNAL_FLASH_SECTOR_SIZE) },
/* flash space used by application */
{ "code", BSP_INTERNAL_FLASH_BASE, (uint32_t)__FLASHX_START_ADDR - 1 },
/* remaining free flash space */
{ "", (uint32_t)__FLASHX_START_ADDR, (uint32_t)__FLASHX_END_ADDR },
{ NULL, 0, 0 }
};
