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ナウいマイコン PSoC4200 の EEPROM(EmEEPROM)（備忘録）
ものによっては
電源OFF時にも、データを記憶しておきたい時があります。
PSoC4200 にもArduino の
EEPROM.write( アドレス , 値 ) // バイト単位でEEPROMに書き込み
ex: EEPROM.write(0x00,100);
のような簡単な命令があればラッキーなんですが・・・・・・・・
ちょと探してみましたが
ネット上で見つからなくて困り果てていました（ナウすぎて情報が追い付いてないのかな？？）。
メーカーさんからのサンプルがあったので、それを見ていこうと思います。
まずはコンポーネント。
/******************************************************************************
* File Name: main_cm4.c
*
* Version: 1.0
*
* Description: This example project demonstrates the basic operation the emulated
* EEPROM middleware. On every reset the device reads the EEPROM contents and
* increments a counter by one.
*
* Related Document: PSoC_Em_EEPROM.pdf
*
* Hardware Dependency: CY8CKIT-062-BLE PSoC 6 BLE Pioneer Kit
*
******************************************************************************
* Copyright (2017), Cypress Semiconductor Corporation.
******************************************************************************
* This software, including source code, documentation and related materials
* ("Software") is owned by Cypress Semiconductor Corporation (Cypress) and is
* protected by and subject to worldwide patent protection (United States and
* foreign), United States copyright laws and international treaty provisions.
* Cypress hereby grants to licensee a personal, non-exclusive, non-transferable
* license to copy, use, modify, create derivative works of, and compile the
* Cypress source code and derivative works for the sole purpose of creating
* custom software in support of licensee product, such licensee product to be
* used only in conjunction with Cypress's integrated circuit as specified in the
* applicable agreement. Any reproduction, modification, translation, compilation,
* or representation of this Software except as specified above is prohibited
* without the express written permission of Cypress.
*
* Disclaimer: THIS SOFTWARE IS PROVIDED AS-IS, WITH NO WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, NONINFRINGEMENT, IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
* Cypress reserves the right to make changes to the Software without notice.
* Cypress does not assume any liability arising out of the application or use
* of Software or any product or circuit described in the Software. Cypress does
* not authorize its products for use as critical components in any products
* where a malfunction or failure may reasonably be expected to result in
* significant injury or death ("ACTIVE Risk Product"). By including Cypress's
* product in a ACTIVE Risk Product, the manufacturer of such system or application
* assumes all risk of such use and in doing so indemnifies Cypress against all
* liability. Use of this Software may be limited by and subject to the applicable
* Cypress software license agreement.
*****************************************************************************/
#include "project.h"
/*Funciton protorype for handling errors*/
void HandleError(void);
/*Logical Size of Em_EEPROM*/
#define LOGICAL_EEPROM_SIZE 15u
#define LOGICAL_EEPROM_START 0u
/*location of reset counter in Em_EEPROM*/
#define RESET_COUNT_LOCATION 13u
#define RESET_COUNT_SIZE 2u
/*ASCII "9"*/
#define ASCII_NINE 0x39
/*ASCII "0"*/
#define ASCII_ZERO 0x30
/*ASCII "P"*/
#define ASCII_P 0x50
/*Return status for EEPROM and UART*/
cy_en_em_eeprom_status_t eepromReturnValue;
/* EEPROM storage in work flash, this is defined in Em_EEPROM.c*/
#if defined (__ICCARM__)
#pragma data_alignment = CY_FLASH_SIZEOF_ROW
const uint8_t Em_EEPROM_em_EepromStorage[Em_EEPROM_PHYSICAL_SIZE] = {0u};
#else
const uint8_t Em_EEPROM_em_EepromStorage[Em_EEPROM_PHYSICAL_SIZE]
__ALIGNED(CY_FLASH_SIZEOF_ROW) = {0u};
#endif /* defined (__ICCARM__) */
/*RAM arrays for holding EEPROM read and write data*/
uint8_t eepromArray[15];
uint8_t array[15] = { 0x50, 0x6F, 0x77, 0x65, 0x72, 0x20, 0x43, 0x79, 0x63, 0x6C, 0x65, 0x23, 0x20, 0x30, 0x30};
/* P o w e r C y c l e # 0*/
int main(void)
{
__enable_irq();
/*Initalize EEPROM with the start address of the memory location*/
eepromReturnValue = Em_EEPROM_Init((uint32_t)Em_EEPROM_em_EepromStorage);
if(eepromReturnValue != CY_EM_EEPROM_SUCCESS)
{
HandleError();
}
UART_PutString("EmEEPROM demo \n\r");
/*Read 15 bytes out of EEPROM memory*/
eepromReturnValue = Em_EEPROM_Read(LOGICAL_EEPROM_START, eepromArray, LOGICAL_EEPROM_SIZE);
if(eepromReturnValue != CY_EM_EEPROM_SUCCESS)
{
HandleError();
}
/*If first byte of EEPROM isn't 'P' the write data from array*/
if(eepromArray[0] != ASCII_P)
{
/*Write inital data to EEPROM*/
eepromReturnValue = Em_EEPROM_Write(LOGICAL_EEPROM_START, array, LOGICAL_EEPROM_SIZE);
if(eepromReturnValue != CY_EM_EEPROM_SUCCESS)
{
HandleError();
}
}
/*Otherwise it has been written update counter*/
else
{
/*Read contents of EEPROM*/
eepromReturnValue = Em_EEPROM_Read(LOGICAL_EEPROM_START, eepromArray, LOGICAL_EEPROM_SIZE);
if(eepromReturnValue != CY_EM_EEPROM_SUCCESS)
{
HandleError();
}
/*Increment Counter by 1*/
eepromArray[RESET_COUNT_LOCATION+1]++;
/*Counter is in ASCII, so handle overflow*/
if(eepromArray[RESET_COUNT_LOCATION+1] > ASCII_NINE)
{
/*Set lower digit to zero*/
eepromArray[RESET_COUNT_LOCATION+1] = ASCII_ZERO;
/*Increment upper digit*/
eepromArray[RESET_COUNT_LOCATION]++;
/*only increment to 99*/
if(eepromArray[RESET_COUNT_LOCATION] > ASCII_NINE)
{
eepromArray[RESET_COUNT_LOCATION] = ASCII_NINE;
eepromArray[RESET_COUNT_LOCATION+1] = ASCII_NINE;
}
}
/*Only update the two count values in the EEPROM*/
eepromReturnValue = Em_EEPROM_Write(RESET_COUNT_LOCATION, &eepromArray[RESET_COUNT_LOCATION], RESET_COUNT_SIZE);
if(eepromReturnValue != CY_EM_EEPROM_SUCCESS)
{
HandleError();
}
}
/*Read contents of EEPROM after write*/
eepromReturnValue = Em_EEPROM_Read(LOGICAL_EEPROM_START, eepromArray, LOGICAL_EEPROM_SIZE);
if(eepromReturnValue != CY_EM_EEPROM_SUCCESS)
{
HandleError();
}
/*Print EEPROM contents to console*/
UART_PutArray(eepromArray, LOGICAL_EEPROM_SIZE);
UART_PutString("\n\r");
for(;;)
{
}
}
/*******************************************************************************
* Function Name: HandleError
****************************************************************************//**
*
* This function processes unrecoverable errors such as any component
* initialization errors etc. In case of such error the system will
* stay in the infinite loop of this function..
*
*
* \note
* * If error ocuurs interrupts are disabled.
*
*******************************************************************************/
void HandleError(void)
{
UART_PutString("Error! \n\r");
/* Disable all interrupts. */
__disable_irq();
/* Infinite loop. */
while(1u) {}
}
/* [] END OF FILE */パワーサイクル、つまり電源投入回数（リセット含む）を記録し、シリアル出力するソフトのようです。
電源投入（またはリセット）時にEEPROMを読み込んで、最初のデータが「P」なら
電源投入回数を「+1」してEEPROMへ書込んでいるようです。
書込み、読込みの確認の戻り値も
eepromReturnValue = ｘｘｘｘｘ
で、きっちりとっていますね、まさに教科書！！
Arduino の
EEPROM.write( アドレス , 値 ) // バイト単位でEEPROMに書き込み
これと似ている命令として
Em_EEPROM_Write(LOGICAL_EEPROM_START, array, LOGICAL_EEPROM_SIZE);
があるようです。
LOGICAL_EEPROM_START：書込みアドレス
array：書込みデータ
LOGICAL_EEPROM_SIZE：書込みデータ数
のようです。
//————————————————————————————————-
サンプルコードで、極力EEPROM以外のところをそぎ落として
自分なりに、復習してみました。
EEPROMへ３文字「@xx」（xxは数字）書き込んで
電源投入（リセット）時
先頭データが「@」なら「xx」の数字に１足して、EEPROMへ再書き込みし
そのデータをキャラクタLCDへ表示させます。
#include "project.h"
#include <stdio.h>
#include <stdlib.h>
#include "I2CLCDDRV.h"
//--------------------------------------------------------
#define EEPROM_START_ADDR 0u // EEPROM 書込みアドレス
const uint8_t Em_EEPROM_em_EepromStorage[Em_EEPROM_PHYSICAL_SIZE] // EEPROM サイズ
__ALIGNED(CY_FLASH_SIZEOF_ROW) = {0u}; // データ配置
// Em_EEPROM_PHYSICAL_SIZE 1024u
// CY_FLASH_SIZEOF_ROW 0x00000080u
//--------------------------------------------------------
uint8 read_EEPROM_data[3]; // 読込みデータ格納場所
char array[3]; // 書込みデータ
//--------------------------------------------------------
int main(void)
{
CyGlobalIntEnable; /* Enable global interrupts. */
/* Place your initialization/startup code here (e.g. MyInst_Start()) */
CyDelay(100); // 安定するまで（おまじない程度）
I2CM_Start(); // I2C 開始
I2C_LCD_Init(); // I2C LCD 初期化
I2C_LCD_position(1,1); // LCD X,Y 表示座標
I2C_LCD_Char_PrintString("EEPROM Test"); // プログラム開始の合図
Em_EEPROM_Init((uint32_t)Em_EEPROM_em_EepromStorage); // EEPROM 初期化
Em_EEPROM_Read(EEPROM_START_ADDR, read_EEPROM_data, 3); // EEPROM 読込み 3byte読込み（３文字）
if (read_EEPROM_data[0]== '@') // EEPROM読んでみて先頭データが'@'なら
{
if(read_EEPROM_data[2] != '9') // １０進表示用
{
read_EEPROM_data[2]++;
}else{
read_EEPROM_data[2] = '0';
read_EEPROM_data[1]++;
}
array[0] = read_EEPROM_data[0];
array[1] = read_EEPROM_data[1];
array[2] = read_EEPROM_data[2];
Em_EEPROM_Write(EEPROM_START_ADDR, array, 3); // EEPROM 書込み 3byte (3文字) (アドレス、書込みデータ、サイズ(byte))
I2C_LCD_position(1,3);
I2C_LCD_Char_PrintString(array); // 書込みデータを表示
}else
{ // EEPROM読んでみて先頭データが'@'じゃなかったら、初期値書込み
array[0] = '@';
array[1] = '0';
array[2] = '0';
Em_EEPROM_Write(EEPROM_START_ADDR, array, 3); // EEPROM 書込み (アドレス、書込みデータ、サイズ(byte))
Em_EEPROM_Read(EEPROM_START_ADDR, read_EEPROM_data, 3); // EEPROM 読込み
}
//--------------------------------------------------------
for(;;)
{
/* Place your application code here. */
// 何にもしない （ぐるぐる）
}
//--------------------------------------------------------
}
電源投入のたびに、数字が１づつ増えるソフトです。
結果動画。
上手くいっているようです。
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