| import struct | |
| import ctypes | |
| import array | |
| # 16bit unsigned int to binary | |
| uint16 = 0xff00 | |
| raw = array.array("B", struct.pack("<H", uint16)) # "<" means little-endian. ">" means big-endian | |
| print(raw) # array('B', [0, 255]) | |
| # multible 16bit unsigned int to binary |
| #include<CH552.h> | |
| #include<Public/Debug.h> | |
| #include<GPIO/GPIO.h> | |
| sbit LED = P1^1; | |
| void main(){ | |
| CfgFsys( ); | |
| mDelaymS(20); | |
| Port1Cfg(1,1); |
アプリケーションによっては，製品出荷時にユニークなIDを記憶させたり，キャリブレーション値を保持する時にMCU内蔵のEEPROMへデータを書き込む事があります．
しかしながら，STM32シリーズのチップにはEEPROMがありません．どうやらFlashメモリをEEPROMのように書き換えて使う想定のようです．
FLASHメモリと言えば書き換え可能な回数が限られており，頻繁な書き換えは信頼性の低下が懸念されます．
そこでデータシートを参照してみると，最低でも1万回の書き換えが保証されているようでした．
これならループを回して書き換えたりしない限り，メモリの劣化は考えなくても良さそうです．
懸念はそれだけではありません．Flashメモリは1バイトづつ書き込む事はできるものの，消去はセクタ単位での一括消去となります．故に，書き換える場合には以下の手順が必要です．
| #include <project.h> | |
| uint8 tick; | |
| uint8 sin_table[] = {100,101,102,104,105,106,107,109,110,111,112,113,115,116,117,118,119,120,121,122,124,125,126,127,128,129,130,131,132,133,134,134,135,136,137,138,139,139,140,141,142,142,143,144,144,145,145,146,146,147,147,147,148,148,149,149,149,149,149,150,150,150,150,150,150,150,150,150,150,150,149,149,149,149,149,148,148,147,147,147,146,146,145,145,144,144,143,142,142,141,140,139,139,138,137,136,135,134,134,133,132,131,130,129,128,127,126,125,124,122,121,120,119,118,117,116,115,113,112,111,110,109,107,106,105,104,102,101,100,99,98,96,95,94,93,91,90,89,88,87,85,84,83,82,81,80,79,78,76,75,74,73,72,71,70,69,68,67,66,66,65,64,63,62,61,61,60,59,58,58,57,56,56,55,55,54,54,53,53,53,52,52,51,51,51,51,51,50,50,50,50,50,50,50,50,50,50,50,51,51,51,51,51,52,52,53,53,53,54,54,55,55,56,56,57,58,58,59,60,61,61,62,63,64,65,66,66,67,68,69,70,71,72,73,74,75,76,78,79,80,81,82,83,84,85,87,88,89,90,91,93,94,95,96,98,99 | |
| }; | |
| void SysTick_Handler(){ | |
| tick++; | |
| Control_Reg_1_Write(1); | |
| C |
| #include <project.h> | |
| uint8 tick; | |
| uint8 sin_table[] = {100,101,102,104,105,106,107,109,110,111,112,113,115,116,117,118,119,120,121,122,124,125,126,127,128,129,130,131,132,133,134,134,135,136,137,138,139,139,140,141,142,142,143,144,144,145,145,146,146,147,147,147,148,148,149,149,149,149,149,150,150,150,150,150,150,150,150,150,150,150,149,149,149,149,149,148,148,147,147,147,146,146,145,145,144,144,143,142,142,141,140,139,139,138,137,136,135,134,134,133,132,131,130,129,128,127,126,125,124,122,121,120,119,118,117,116,115,113,112,111,110,109,107,106,105,104,102,101,100,99,98,96,95,94,93,91,90,89,88,87,85,84,83,82,81,80,79,78,76,75,74,73,72,71,70,69,68,67,66,66,65,64,63,62,61,61,60,59,58,58,57,56,56,55,55,54,54,53,53,53,52,52,51,51,51,51,51,50,50,50,50,50,50,50,50,50,50,50,51,51,51,51,51,52,52,53,53,53,54,54,55,55,56,56,57,58,58,59,60,61,61,62,63,64,65,66,66,67,68,69,70,71,72,73,74,75,76,78,79,80,81,82,83,84,85,87,88,89,90,91,93,94,95,96,98,99 | |
| }; | |
| void SysTick_Handler(){ | |
| tick++; | |
| Control_Reg_1_Write(1); | |
| C |
| using System.Runtime.InteropServices; | |
| // 構造体の中身をきっちりパッキングする | |
| [StructLayout(LayoutKind.Sequential)] | |
| struct message | |
| { | |
| public byte foo; | |
| public byte bar; | |
| public uint16 boo; | |
