[FL-2393][FL-2381] iButton, OneWire: move to plain C (#1068)
* iButton: getting started on the worker concept * Hal delay: added global instructions_per_us variable * iButton: one wire slave * iButton: ibutton key setter * iButton: one wire host, use ibutton_hal * iButton\RFID: common pulse decoder concept * iButton: cyfral decoder * iButton: worker thread concept * iButton: metakom decoder * iButton: write key through worker * iButton: worker mode holder * iButton: worker improvements * iButton: Cyfral encoder * iButton: Metakom encoder * lib: pulse protocol helpers * iButton: Metakom decoder * iButton: Cyfral decoder * iButton worker: separate modes * iButton: libs documentation * HAL: iButton gpio modes * iButton worker: rename modes file * iButton worker, hal: move to LL * iButton CLI: worker for reading and emulation commands * iButton HAL: correct init and emulation sequence * iButton cli: moved to plain C * iButton: move to worker, small step to plain C * Libs, one wire: move to plain C * Libs: added forgotten files to compilation * iButton writer: get rid of manual disable/enable irq
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261
lib/one_wire/one_wire_host.c
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261
lib/one_wire/one_wire_host.c
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#include <furi.h>
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#include <furi_hal.h>
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#include "one_wire_host.h"
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#include "one_wire_host_timing.h"
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struct OneWireHost {
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// global search state
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unsigned char saved_rom[8];
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uint8_t last_discrepancy;
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uint8_t last_family_discrepancy;
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bool last_device_flag;
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};
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OneWireHost* onewire_host_alloc() {
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OneWireHost* host = malloc(sizeof(OneWireHost));
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onewire_host_reset_search(host);
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return host;
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}
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void onewire_host_free(OneWireHost* host) {
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onewire_host_stop(host);
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free(host);
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}
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bool onewire_host_reset(OneWireHost* host) {
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uint8_t r;
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uint8_t retries = 125;
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// wait until the gpio is high
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furi_hal_ibutton_pin_high();
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do {
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if(--retries == 0) return 0;
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delay_us(2);
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} while(!furi_hal_ibutton_pin_get_level());
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// pre delay
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delay_us(OWH_RESET_DELAY_PRE);
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// drive low
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furi_hal_ibutton_pin_low();
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delay_us(OWH_RESET_DRIVE);
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// release
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furi_hal_ibutton_pin_high();
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delay_us(OWH_RESET_RELEASE);
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// read and post delay
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r = !furi_hal_ibutton_pin_get_level();
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delay_us(OWH_RESET_DELAY_POST);
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return r;
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}
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bool onewire_host_read_bit(OneWireHost* host) {
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bool result;
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// drive low
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furi_hal_ibutton_pin_low();
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delay_us(OWH_READ_DRIVE);
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// release
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furi_hal_ibutton_pin_high();
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delay_us(OWH_READ_RELEASE);
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// read and post delay
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result = furi_hal_ibutton_pin_get_level();
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delay_us(OWH_READ_DELAY_POST);
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return result;
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}
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uint8_t onewire_host_read(OneWireHost* host) {
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uint8_t result = 0;
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for(uint8_t bitMask = 0x01; bitMask; bitMask <<= 1) {
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if(onewire_host_read_bit(host)) {
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result |= bitMask;
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}
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}
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return result;
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}
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void onewire_host_read_bytes(OneWireHost* host, uint8_t* buffer, uint16_t count) {
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for(uint16_t i = 0; i < count; i++) {
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buffer[i] = onewire_host_read(host);
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}
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}
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void onewire_host_write_bit(OneWireHost* host, bool value) {
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if(value) {
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// drive low
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furi_hal_ibutton_pin_low();
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delay_us(OWH_WRITE_1_DRIVE);
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// release
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furi_hal_ibutton_pin_high();
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delay_us(OWH_WRITE_1_RELEASE);
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} else {
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// drive low
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furi_hal_ibutton_pin_low();
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delay_us(OWH_WRITE_0_DRIVE);
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// release
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furi_hal_ibutton_pin_high();
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delay_us(OWH_WRITE_0_RELEASE);
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}
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}
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void onewire_host_write(OneWireHost* host, uint8_t value) {
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uint8_t bitMask;
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for(bitMask = 0x01; bitMask; bitMask <<= 1) {
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onewire_host_write_bit(host, (bitMask & value) ? 1 : 0);
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}
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}
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void onewire_host_skip(OneWireHost* host) {
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onewire_host_write(host, 0xCC);
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}
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void onewire_host_start(OneWireHost* host) {
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furi_hal_ibutton_start_drive();
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}
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void onewire_host_stop(OneWireHost* host) {
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furi_hal_ibutton_stop();
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}
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void onewire_host_reset_search(OneWireHost* host) {
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host->last_discrepancy = 0;
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host->last_device_flag = false;
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host->last_family_discrepancy = 0;
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for(int i = 7;; i--) {
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host->saved_rom[i] = 0;
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if(i == 0) break;
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}
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}
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void onewire_host_target_search(OneWireHost* host, uint8_t family_code) {
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host->saved_rom[0] = family_code;
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for(uint8_t i = 1; i < 8; i++) host->saved_rom[i] = 0;
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host->last_discrepancy = 64;
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host->last_family_discrepancy = 0;
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host->last_device_flag = false;
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}
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uint8_t onewire_host_search(OneWireHost* host, uint8_t* newAddr, OneWireHostSearchMode mode) {
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uint8_t id_bit_number;
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uint8_t last_zero, rom_byte_number, search_result;
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uint8_t id_bit, cmp_id_bit;
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unsigned char rom_byte_mask, search_direction;
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// initialize for search
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id_bit_number = 1;
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last_zero = 0;
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rom_byte_number = 0;
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rom_byte_mask = 1;
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search_result = 0;
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// if the last call was not the last one
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if(!host->last_device_flag) {
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// 1-Wire reset
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if(!onewire_host_reset(host)) {
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// reset the search
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host->last_discrepancy = 0;
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host->last_device_flag = false;
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host->last_family_discrepancy = 0;
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return false;
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}
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// issue the search command
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switch(mode) {
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case CONDITIONAL_SEARCH:
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onewire_host_write(host, 0xEC);
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break;
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case NORMAL_SEARCH:
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onewire_host_write(host, 0xF0);
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break;
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}
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// loop to do the search
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do {
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// read a bit and its complement
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id_bit = onewire_host_read_bit(host);
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cmp_id_bit = onewire_host_read_bit(host);
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// check for no devices on 1-wire
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if((id_bit == 1) && (cmp_id_bit == 1))
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break;
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else {
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// all devices coupled have 0 or 1
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if(id_bit != cmp_id_bit)
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search_direction = id_bit; // bit write value for search
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else {
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// if this discrepancy if before the Last Discrepancy
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// on a previous next then pick the same as last time
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if(id_bit_number < host->last_discrepancy)
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search_direction =
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((host->saved_rom[rom_byte_number] & rom_byte_mask) > 0);
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else
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// if equal to last pick 1, if not then pick 0
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search_direction = (id_bit_number == host->last_discrepancy);
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// if 0 was picked then record its position in LastZero
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if(search_direction == 0) {
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last_zero = id_bit_number;
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// check for Last discrepancy in family
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if(last_zero < 9) host->last_family_discrepancy = last_zero;
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}
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}
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// set or clear the bit in the ROM byte rom_byte_number
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// with mask rom_byte_mask
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if(search_direction == 1)
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host->saved_rom[rom_byte_number] |= rom_byte_mask;
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else
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host->saved_rom[rom_byte_number] &= ~rom_byte_mask;
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// serial number search direction write bit
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onewire_host_write_bit(host, search_direction);
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// increment the byte counter id_bit_number
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// and shift the mask rom_byte_mask
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id_bit_number++;
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rom_byte_mask <<= 1;
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// if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask
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if(rom_byte_mask == 0) {
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rom_byte_number++;
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rom_byte_mask = 1;
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}
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}
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} while(rom_byte_number < 8); // loop until through all ROM bytes 0-7
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// if the search was successful then
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if(!(id_bit_number < 65)) {
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// search successful so set last_Discrepancy, last_device_flag, search_result
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host->last_discrepancy = last_zero;
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// check for last device
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if(host->last_discrepancy == 0) host->last_device_flag = true;
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search_result = true;
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}
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}
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// if no device found then reset counters so next 'search' will be like a first
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if(!search_result || !host->saved_rom[0]) {
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host->last_discrepancy = 0;
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host->last_device_flag = false;
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host->last_family_discrepancy = 0;
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search_result = false;
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} else {
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for(int i = 0; i < 8; i++) newAddr[i] = host->saved_rom[i];
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}
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return search_result;
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}
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