one-wire-memory/Src/memory_ec20.c

#include "memory_ec20.h"

OneWire_EC20_typeDef mem_page = {};

uint8_t DS28EC20_init(void* GPIOx, uint16_t GPIO_Pin) {
	GPIO_TypeDef *GpioPort = (GPIO_TypeDef*)GPIOx;
	oneWire_init(GpioPort, GPIO_Pin);
    mem_page.real_size=0;
    HAL_Delay(2);
    owFirst();
    owGetROM(mem_page.ROM);
    if (mem_page.ROM[0] != DS28EC20_FAMILY_CODE) {
    	return 0;
    }
    return 1;
}

void DS28EC20_readMem(uint16_t address, uint8_t size) {

    owReset();
    owSelect(mem_page.ROM);

    owWriteByte(CMD_READ_MEMORY, OW_STRONG_OFF);
    owWriteByte(address & 0xFF, OW_STRONG_OFF);
    owWriteByte(address >> 8, OW_STRONG_OFF);

    uint8_t i;
    for(i=0; i < size ; i++) {
        mem_page.buffer_rx[i] = owReadByte();
    }

}


/**
 * @brief Write data to memory
 * @return 0 - OK, 1 or 2 - bad address
 */
uint8_t DS28EC20_writeMem(uint16_t addr, uint8_t size) {
    uint8_t TA1 = (uint8_t) (addr & 0xFF);
    uint8_t TA2 = (uint8_t) ((addr >> 8) & 0xFF);

    uint8_t i;

	owReset();
	owSelect(mem_page.ROM);

	owWriteByte(CMD_WRITE_SCRATCHPAD, OW_STRONG_OFF);      // 0x0F
	owWriteByte(TA1,OW_STRONG_OFF);
	owWriteByte(TA2, OW_STRONG_OFF);
	for (i = 0 ; i < size; i++) {
		owWriteByte(mem_page.buffer_tx[i], OW_STRONG_OFF);
	}

	owReset();
	owSelect(mem_page.ROM);

	owWriteByte(CMD_READ_SCRATCHPAD, OW_STRONG_OFF);    //0xAA
	uint8_t tempVal = owReadByte();
	if (tempVal != TA1) {
		return 1;
	}

	tempVal = owReadByte();
	if (tempVal != TA2) {
		return 2;
	}

	uint8_t ES = owReadByte();

	for (i = 0 ; i < size; i++) {
		tempVal = owReadByte();
		if (tempVal != mem_page.buffer_tx[i]) {
			return i + 10;
		}
	}

	HAL_Delay(10);
    owReset();
	owSelect(mem_page.ROM);

	owWriteByte(CMD_COPY_SCRATCHPAD, OW_STRONG_OFF);  //0x55
	owWriteByte(TA1, OW_STRONG_OFF);
	owWriteByte(TA2, OW_STRONG_OFF);
	owWriteByte(ES, OW_STRONG_OFF);
	HAL_Delay(10);

	owReset();
	return 0;
}


uint32_t DS28EC20_readData4B(uint16_t address) {
    mem_page.buffer_rx[3] = mem_page.buffer_rx[2] = mem_page.buffer_rx[1] = mem_page.buffer_rx[0] = 0;
    DS28EC20_readMem(address, 4);
    uint32_t data32 = mem_page.buffer_rx[3];
    data32 |= mem_page.buffer_rx[2]<<8;
    data32 |= mem_page.buffer_rx[1]<<16;
    data32 |= mem_page.buffer_rx[0]<<24;
    return data32;
}

uint16_t DS28EC20_readData2B(uint16_t address) {
    mem_page.buffer_rx[1] = mem_page.buffer_rx[0] = 0;
    DS28EC20_readMem(address, 2);
    uint16_t data16 = mem_page.buffer_rx[1];
    data16 |= mem_page.buffer_rx[0]<<8;
    return data16;
}

uint8_t DS28EC20_readData1B(uint16_t address) {
    mem_page.buffer_rx[1] = mem_page.buffer_rx[0] = 0;
    DS28EC20_readMem(address, 1);
    uint8_t data8 = mem_page.buffer_rx[0];
    return data8;
}

/**
 * @brief Zapíše dáta do pamäte. Maximálna dlžka data je 32B.
 */
uint8_t DS28EC20_writeData(uint8_t *data, uint16_t adr, uint8_t length) {
	memcpy(mem_page.buffer_tx, data, length);
	return DS28EC20_writeMem(adr,length);

}

uint8_t DS28EC20_getId(uint8_t* data) {
	owGetROM(mem_page.ROM);
	memcpy(data, mem_page.ROM, 8);
	return 8;
}

/**
 * Return capacity in Bytes
 */
uint32_t DS28EC20_getCapacity(void) {
	return 2560;
}