69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
#include "i2c/i2c.h"
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#include "eeprom.h"
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uint8_t eeprom_ready() {
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uint32_t state;
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I2CMasterBuffer[0] = EEPROM_BASE_ADDR; // Slave address, page 0, write
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I2CWriteLength = 1; // just write the slave address and stop
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I2CReadLength = 0;
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state = i2cEngine();
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if (state == I2CSTATE_ACK) {
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return 1; // ready for next operation
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} else {
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return 0;
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}
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}
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uint8_t eeprom_write_byte(uint8_t page_addr, uint8_t byte_addr, uint8_t value) {
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uint8_t i2c_addr;
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uint8_t intern_byte_addr;
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uint32_t state;
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// calculate our addresses with evil bitshift magic
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i2c_addr = EEPROM_BASE_ADDR | (page_addr >> 3) & 0xFE; // bits 7-4 = base address, 3-1 = bits 6-4 of page address, 0 = R/W
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intern_byte_addr = (page_addr << 4) | (byte_addr & 0x0F); // bits 7-4 = bits 3-0 of page address, 3-0 = lower 4 bits of byte address
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I2CMasterBuffer[0] = i2c_addr;
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I2CMasterBuffer[1] = intern_byte_addr;
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I2CMasterBuffer[2] = value;
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I2CWriteLength = 3;
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I2CReadLength = 0;
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state = i2cEngine();
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if (state == I2CSTATE_ACK) {
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return 1; // ready for next operation
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} else {
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return 0;
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}
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}
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uint8_t eeprom_read_byte(uint8_t page_addr, uint8_t byte_addr, uint8_t *value) {
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uint8_t i2c_addr;
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uint8_t intern_byte_addr;
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uint32_t state;
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// calculate our addresses with evil bitshift magic
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i2c_addr = EEPROM_BASE_ADDR | (page_addr >> 3) & 0xFE; // bits 7-4 = base address, 3-1 = bits 6-4 of page address, 0 = R/W
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intern_byte_addr = (page_addr << 4) | (byte_addr & 0x0F); // bits 7-4 = bits 3-0 of page address, 3-0 = lower 4 bits of byte address
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I2CMasterBuffer[0] = i2c_addr;
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I2CMasterBuffer[1] = intern_byte_addr;
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I2CMasterBuffer[2] = i2c_addr | READ_WRITE;
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I2CWriteLength = 2;
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I2CReadLength = 1;
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state = i2cEngine();
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if (state == I2CSTATE_ACK) {
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*value = I2CSlaveBuffer[0];
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return 1; // ready for next operation
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} else {
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return 0;
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}
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}
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