NES red and White machine simulator 3rd game handle Test Wuyi STM32

The handle is used CD4021, datasheet said support 3v-15v.

Since the handle is 5V powered, the Gpio 3.3V level is on the 2440 board and the STM32 Gpio is 3.3V (also compatible with 5V) levels.

So first on the STM32 test can be used, on the 2440 Development Board.

It's exactly 8 key values that point to 8 LEDs. Press a key and a light will be lit.

C51:

1#include <reg52.h>2 3Sbit CLK = P2 ^2;4Sbit LATCH = P2 ^1;5Sbit DAT0 = P2 ^0;6 7 voidDELAY10US ()//@11.0592mhz8 {9UnsignedChari;Teni =2; One      while(--i); A } -  -UnsignedCharjoypad () the {     -     inti; -UnsignedCharcmd =0; -LATCH =1; + delay10us (); -LATCH =0; +      for(i=0; i<8; i++) A     {         at delay10us (); -         if(DAT0) -         { -CMD |=1<<i; -         } -CLK =1; in delay10us (); -CLK =0; to     } +LATCH = CLK =0; -     returncmd; the } *  $ intMain ()Panax Notoginseng { -UnsignedCharcmd; theCLK = LATCH = DAT0 =0; + delay10us (); A      while(1) the     { +cmd =joypad (); -         //Lighting $P1 =cmd; $     } -}

STM32: The main part, other parts of the source code, can be found in the STM32 classification.

1#include"stm32f10x.h"2#include"bitband.h"3#include"Delay.h"4 5 voidSysteminit ()6 {7RCC-&GT;CR |= Rcc_cr_hseon;/*External Clock Open*/8      while(! (RCC-&GT;CR & Rcc_cr_hserdy));/*Check the flag position to determine if it is continued*/9     TenRCC-&GT;CFGR = rcc_cfgr_ppre1_2;/*APB1 Low Speed Device 2 -way 72m/2=36m*/ OneRcc->cfgr |= Rcc_cfgr_pllmull9;/*PLL 9 times frequency multiplier*/ ARcc->cfgr |= rcc_cfgr_pllsrc;/*HSE as PLL input*/ -      -FLASH-&GT;ACR |=2;/*2 waiting states of 72M*/ the      -RCC-&GT;CR |= Rcc_cr_pllon;/*Enable PLL*/ -      while(! (RCC-&GT;CR & Rcc_cr_hserdy));/*Check the flag position to determine if it is continued*/ -      +RCC-&GT;CFGR |=RCC_CFGR_SW_PLL;/*Select an external clock as the system clock*/ -      while(2! = ((rcc->cfgr>>2) &3));/*Check the flag position to determine if it is continued*/ + } A  at U8 Joypad () - {     -     inti; -U8 cmd =0; -GPC_BSRR (1) =1; -Delay_us (Ten); inGPC_BRR (1) =1; -      for(i=0; i<8; i++) to     {         +Delay_us (Ten); -         //low-Power indicates that a pressed the         if(0= = GPC_IDR (2)) *         { $CMD |=1<<i;Panax Notoginseng         } -GPC_BSRR (0) =1; theDelay_us (Ten); +GPC_BRR (0) =1; A     } theGPC_BRR (0) =1; +GPC_BRR (1) =1; -     returncmd; $ } $  - intMainvoid) - { the U8 cmd; -     //pin Enable clock IOA IOB IOCWuyiRcc->apb2enr |= Rcc_apb2enr_iopaen | Rcc_apb2enr_iopben |Rcc_apb2enr_iopcen; the      -GPIOC-&GT;CRL =0; Wu      -     //Configuring the LED lamp pin mode PC7 AboutGPIOC-&GT;CRL |= Gpio_crl_mode7;//Mode is set to 11:50m output $GPC_BSRR (7) =1; -      -     //configuration handle CLK pin mode PC0 -GPIOC-&GT;CRL |= gpio_crl_mode0;//Mode is set to 11:50m output A     //Default Low Level +GPC_BRR (0) =1; the      -     //configuration handle latch pin mode PC1 $GPIOC-&GT;CRL |= Gpio_crl_mode1;//Mode is set to 11:50m output the     //Default Low Level theGPC_BRR (1) =1; the      the     //handle DAT0 input pin PC2 -GPIOC-&GT;CRL |= gpio_crl_cnf2_1;//10 Input Mode pull-up/ pull-down in     //Setting the drop-down theGPC_BRR (2) =1; the      About     //Cycle lit the      while(1) the     { thecmd =joypad (); +         //If there is input on the dot led -         if(CMD) the         {BayiGPC_ODR (7) =0; the         } the         Else -         { -GPC_ODR (7) =1;  the         } the          the     } the     return 0; -}

NES red and White machine simulator 3rd game handle Test Wuyi STM32