76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
#include <stdint.h>
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#include "eeprom.h"
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#include "spi.h"
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#define MAGIC 0xaffe
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#define HIGHSCORE_ADDR 0x00
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#define DUMMY 0x00
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#define CMD_READ 0b00000011
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#define CMD_WRITE 0b00000010
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#define CMD_WRDI 0b00000100
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#define CMD_WREN 0b00000110
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typedef union {
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uint8_t buffer[4];
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struct {
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uint16_t magic;
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uint16_t highScore;
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} v;
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} eepromBuf_t;
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eepromBuf_t buf;
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static void writeBuf() {
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spiSendBegin(e_SPI_EEPROM);
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spiSendOctet(CMD_WREN);
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spiSendEnd(e_SPI_EEPROM);
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spiSendBegin(e_SPI_EEPROM);
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spiSendOctet(CMD_WRITE);
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spiSendOctet(HIGHSCORE_ADDR);
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spiSendOctet(buf.buffer[0]);
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spiSendOctet(buf.buffer[1]);
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spiSendOctet(buf.buffer[2]);
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spiSendOctet(buf.buffer[3]);
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spiSendEnd(e_SPI_EEPROM);
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}
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static void readBuf() {
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spiSendBegin(e_SPI_EEPROM);
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spiSendOctet(CMD_READ);
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spiReceiveOctet();
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spiSendOctet(HIGHSCORE_ADDR);
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spiReceiveOctet();
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spiSendOctet(DUMMY);
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buf.buffer[0] = spiReceiveOctet();
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spiSendOctet(DUMMY);
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buf.buffer[1] = spiReceiveOctet();
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spiSendOctet(DUMMY);
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buf.buffer[2] = spiReceiveOctet();
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spiSendOctet(DUMMY);
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buf.buffer[3] = spiReceiveOctet();
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spiSendEnd(e_SPI_EEPROM);
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}
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void eepromInit() {
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readBuf();
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if (buf.v.magic != MAGIC) {
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buf.v.magic = MAGIC;
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buf.v.highScore = 0;
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writeBuf();
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}
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}
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uint16_t eepromReadHighScore() {
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return buf.v.highScore;
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}
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void eepromWriteHighScore(uint16_t v) {
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buf.v.highScore = v;
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writeBuf();
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}
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