pcb and initial code from https://github.com/das-labor/borgware-2d.git
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45 lines
913 B
45 lines
913 B
#include <avr/io.h>
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#include <util/delay.h>
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#include "../makros.h"
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#include "../config.h"
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#define NES_PAD_DDR_PL DDR(NES_PAD_PORT_PL)
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#define NES_PAD_DDR_CLK DDR(NES_PAD_PORT_CLK)
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#define NES_PAD_DDR_DS DDR(NES_PAD_PIN_DS)
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volatile unsigned char fakeport;
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unsigned char waitForFire;
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void joy_init(){
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NES_PAD_DDR_PL |= 1<<NES_PAD_BIT_PL;
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NES_PAD_DDR_CLK |= 1<<NES_PAD_BIT_CLK;
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NES_PAD_DDR_DS &= ~(1<<NES_PAD_BIT_DS);
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}
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void readButtons(){
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NES_PAD_PORT_PL |= 1<<NES_PAD_BIT_PL;
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asm volatile("nop\r\t");
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asm volatile("nop\r\t");
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asm volatile("nop\r\t");
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NES_PAD_PORT_PL &= ~ (1<<NES_PAD_BIT_PL);
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uint8_t i, port=0;
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for(i=0; i<8; i++){
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port >>= 1;
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_delay_us(1);
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if(NES_PAD_PIN_DS & (1 << NES_PAD_BIT_DS))
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port |=0x80;
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NES_PAD_PORT_CLK |= 1<<NES_PAD_BIT_CLK;
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asm volatile("nop\r\t");
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asm volatile("nop\r\t");
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NES_PAD_PORT_CLK &= ~(1<<NES_PAD_BIT_CLK);
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}
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fakeport= ~port;
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}
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