TI中文支持网多次写入同一地址下发现数据错误，为什么？
Maka Luo：
Flash 写入前均需保证此地址数据为0XFF，否则会导致写入失败。
所以写入前擦除是对的。
LI CHUNLEI Panasonic Corporation of China：
回复 Maka Luo:
那这也太坑了吧~ flash擦除的最小单位是段。比如说我在某段里存了好多数据，而只对某一个或多个数据修改，我却需要把整段数据都擦除重写吗？有什么更好的办法吗？
LI CHUNLEI Panasonic Corporation of China：
回复 Maka Luo:
我现在用的是MSP430F149啊~ flash MCU的，不是FRAM MCU，
你有针对flash MCU修改一个段内部分数据的例程吗？能不能给我借鉴一下？谢谢！
Maka Luo：
回复 LI CHUNLEI Panasonic Corporation of China:
这个是对information flash 写
/* –COPYRIGHT–,BSD_EX * Copyright (c) 2012, Texas Instruments Incorporated * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * * Neither the name of Texas Instruments Incorporated nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ******************************************************************************* * * MSP430 CODE EXAMPLE DISCLAIMER * * MSP430 code examples are self-contained low-level programs that typically * demonstrate a single peripheral function or device feature in a highly * concise manner. For this the code may rely on the device's power-on default * register values and settings such as the clock configuration and care must * be taken when combining code from several examples to avoid potential side * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware * for an API functional library-approach to peripheral configuration. * * –/COPYRIGHT–*///****************************************************************************// MSP-FET430P140 Demo – Flash In-System Programming, Copy SegA to SegB//// Description: This program first erases flash seg A, then it increments all// values in seg A, then it erases seg B, then copies seg A to seg B.// Assumed MCLK 550kHz – 900kHz.// //* Set Breakpoint on NOP in the Mainloop to avoid Stressing Flash *////// MSP430F149// —————–// /|\| XIN|-// | | |// –|RST XOUT|-// | |//// M. Mitchell// Texas Instruments Inc.// Feb 2005// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.21A//******************************************************************************
#include <msp430.h>
char value; // 8-bit value to write to segment A
// Function prototypesvoid write_SegA (char value);void copy_A2B (void);
int main(void){ WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer FCTL2 = FWKEY + FSSEL0 + FN0; // MCLK/2 for Flash Timing Generator value = 0; // Initialize value
while(1) // Repeat forever { write_SegA(value++); // Write segment A, increment value copy_A2B(); // Copy segment A to B __no_operation(); // SET BREAKPOINT HERE }}
void write_SegA (char value){ char *Flash_ptr; // Flash pointer unsigned int i;
Flash_ptr = (char *) 0x1080; // Initialize Flash pointer FCTL1 = FWKEY + ERASE; // Set Erase bit FCTL3 = FWKEY; // Clear Lock bit *Flash_ptr = 0; // Dummy write to erase Flash segment
FCTL1 = FWKEY + WRT; // Set WRT bit for write operation
for (i=0; i<128; i++) { *Flash_ptr++ = value; // Write value to flash }
FCTL1 = FWKEY; // Clear WRT bit FCTL3 = FWKEY + LOCK; // Set LOCK bit}
void copy_A2B (void){ char *Flash_ptrA; // Segment A pointer char *Flash_ptrB; // Segment B pointer unsigned int i;
Flash_ptrA = (char *) 0x1080; // Initialize Flash segment A pointer Flash_ptrB = (char *) 0x1000; // Initialize Flash segment B pointer FCTL1 = FWKEY + ERASE; // Set Erase bit FCTL3 = FWKEY; // Clear Lock bit *Flash_ptrB = 0; // Dummy write to erase Flash segment B FCTL1 = FWKEY + WRT; // Set WRT bit for write operation
for (i=0; i<128; i++) { *Flash_ptrB++ = *Flash_ptrA++; // Copy value segment A to segment B }
FCTL1 = FWKEY; // Clear WRT bit FCTL3 = FWKEY + LOCK; // Set LOCK bit}
Butterfly：
回复 LI CHUNLEI Panasonic Corporation of China:
Information Flash 除了出厂占用的固化参数以外，就是给你存用户数据的，扇区比普通Flash小
