96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
#include "rw1990.h"
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#include <core/kernel.h>
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#define RW1990_1_CMD_WRITE_RECORD_FLAG 0xD1
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#define RW1990_1_CMD_READ_RECORD_FLAG 0xB5
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#define RW1990_1_CMD_WRITE_ROM 0xD5
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#define RW1990_2_CMD_WRITE_RECORD_FLAG 0x1D
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#define RW1990_2_CMD_READ_RECORD_FLAG 0x1E
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#define RW1990_2_CMD_WRITE_ROM 0xD5
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#define DS1990_CMD_READ_ROM 0x33
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static void rw1990_write_byte(OneWireHost* host, uint8_t value) {
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for(uint8_t bitMask = 0x01; bitMask; bitMask <<= 1) {
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onewire_host_write_bit(host, (bool)(bitMask & value));
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furi_delay_us(5000);
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}
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}
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static bool rw1990_read_and_compare(OneWireHost* host, const uint8_t* data, size_t data_size) {
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bool success = false;
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if(onewire_host_reset(host)) {
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success = true;
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onewire_host_write(host, DS1990_CMD_READ_ROM);
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for(size_t i = 0; i < data_size; ++i) {
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if(data[i] != onewire_host_read(host)) {
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success = false;
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break;
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}
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}
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}
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return success;
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}
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bool rw1990_write_v1(OneWireHost* host, const uint8_t* data, size_t data_size) {
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// Unlock sequence
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onewire_host_reset(host);
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onewire_host_write(host, RW1990_1_CMD_WRITE_RECORD_FLAG);
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furi_delay_us(10);
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onewire_host_write_bit(host, false);
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furi_delay_us(5000);
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// Write data
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onewire_host_reset(host);
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onewire_host_write(host, RW1990_1_CMD_WRITE_ROM);
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for(size_t i = 0; i < data_size; ++i) {
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// inverted key for RW1990.1
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rw1990_write_byte(host, ~(data[i]));
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furi_delay_us(30000);
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}
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// Lock sequence
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onewire_host_write(host, RW1990_1_CMD_WRITE_RECORD_FLAG);
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onewire_host_write_bit(host, true);
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furi_delay_us(10000);
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// TODO FL-3528: Better error handling
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return rw1990_read_and_compare(host, data, data_size);
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}
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bool rw1990_write_v2(OneWireHost* host, const uint8_t* data, size_t data_size) {
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// Unlock sequence
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onewire_host_reset(host);
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onewire_host_write(host, RW1990_2_CMD_WRITE_RECORD_FLAG);
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furi_delay_us(10);
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onewire_host_write_bit(host, true);
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furi_delay_us(5000);
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// Write data
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onewire_host_reset(host);
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onewire_host_write(host, RW1990_2_CMD_WRITE_ROM);
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for(size_t i = 0; i < data_size; ++i) {
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rw1990_write_byte(host, data[i]);
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furi_delay_us(30000);
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}
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// Lock sequence
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onewire_host_write(host, RW1990_2_CMD_WRITE_RECORD_FLAG);
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onewire_host_write_bit(host, false);
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furi_delay_us(10000);
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// TODO Fl-3528: Better error handling
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return rw1990_read_and_compare(host, data, data_size);
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}
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