320 lines
8.3 KiB
C
320 lines
8.3 KiB
C
#include "one_wire_slave.h"
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#include "one_wire_slave_i.h"
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#include "one_wire_device.h"
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#include <furi.h>
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#include <furi_hal.h>
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#define OWS_RESET_MIN 270
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#define OWS_RESET_MAX 960
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#define OWS_PRESENCE_TIMEOUT 20
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#define OWS_PRESENCE_MIN 100
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#define OWS_PRESENCE_MAX 480
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#define OWS_MSG_HIGH_TIMEOUT 15000
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#define OWS_SLOT_MAX 135
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#define OWS_READ_MIN 20
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#define OWS_READ_MAX 60
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#define OWS_WRITE_ZERO 30
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typedef enum {
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NO_ERROR = 0,
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VERY_LONG_RESET,
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VERY_SHORT_RESET,
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PRESENCE_LOW_ON_LINE,
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AWAIT_TIMESLOT_TIMEOUT_HIGH,
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INCORRECT_ONEWIRE_CMD,
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FIRST_BIT_OF_BYTE_TIMEOUT,
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RESET_IN_PROGRESS
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} OneWireSlaveError;
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struct OneWireSlave {
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OneWireSlaveError error;
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OneWireDevice* device;
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OneWireSlaveResultCallback result_cb;
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void* result_cb_ctx;
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};
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/*********************** PRIVATE ***********************/
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uint32_t onewire_slave_wait_while_gpio_is(OneWireSlave* bus, uint32_t time, const bool pin_value) {
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UNUSED(bus);
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uint32_t start = DWT->CYCCNT;
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uint32_t time_ticks = time * furi_hal_cortex_instructions_per_microsecond();
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uint32_t time_captured;
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do { //-V1044
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time_captured = DWT->CYCCNT;
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if(furi_hal_ibutton_pin_get_level() != pin_value) {
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uint32_t remaining_time = time_ticks - (time_captured - start);
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remaining_time /= furi_hal_cortex_instructions_per_microsecond();
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return remaining_time;
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}
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} while((time_captured - start) < time_ticks);
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return 0;
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}
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bool onewire_slave_show_presence(OneWireSlave* bus) {
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// wait while master delay presence check
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onewire_slave_wait_while_gpio_is(bus, OWS_PRESENCE_TIMEOUT, true);
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// show presence
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furi_hal_ibutton_pin_low();
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furi_delay_us(OWS_PRESENCE_MIN);
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furi_hal_ibutton_pin_high();
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// somebody also can show presence
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const uint32_t wait_low_time = OWS_PRESENCE_MAX - OWS_PRESENCE_MIN;
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// so we will wait
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if(onewire_slave_wait_while_gpio_is(bus, wait_low_time, false) == 0) {
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bus->error = PRESENCE_LOW_ON_LINE;
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return false;
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}
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return true;
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}
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bool onewire_slave_receive_bit(OneWireSlave* bus) {
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// wait while bus is low
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uint32_t time = OWS_SLOT_MAX;
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time = onewire_slave_wait_while_gpio_is(bus, time, false);
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if(time == 0) {
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bus->error = RESET_IN_PROGRESS;
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return false;
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}
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// wait while bus is high
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time = OWS_MSG_HIGH_TIMEOUT;
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time = onewire_slave_wait_while_gpio_is(bus, time, true);
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if(time == 0) {
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bus->error = AWAIT_TIMESLOT_TIMEOUT_HIGH;
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return false;
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}
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// wait a time of zero
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time = OWS_READ_MIN;
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time = onewire_slave_wait_while_gpio_is(bus, time, false);
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return (time > 0);
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}
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bool onewire_slave_send_bit(OneWireSlave* bus, bool value) {
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const bool write_zero = !value;
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// wait while bus is low
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uint32_t time = OWS_SLOT_MAX;
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time = onewire_slave_wait_while_gpio_is(bus, time, false);
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if(time == 0) {
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bus->error = RESET_IN_PROGRESS;
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return false;
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}
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// wait while bus is high
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time = OWS_MSG_HIGH_TIMEOUT;
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time = onewire_slave_wait_while_gpio_is(bus, time, true);
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if(time == 0) {
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bus->error = AWAIT_TIMESLOT_TIMEOUT_HIGH;
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return false;
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}
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// choose write time
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if(write_zero) {
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furi_hal_ibutton_pin_low();
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time = OWS_WRITE_ZERO;
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} else {
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time = OWS_READ_MAX;
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}
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// hold line for ZERO or ONE time
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furi_delay_us(time);
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furi_hal_ibutton_pin_high();
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return true;
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}
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void onewire_slave_cmd_search_rom(OneWireSlave* bus) {
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const uint8_t key_bytes = 8;
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uint8_t* key = onewire_device_get_id_p(bus->device);
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for(uint8_t i = 0; i < key_bytes; i++) {
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uint8_t key_byte = key[i];
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for(uint8_t j = 0; j < 8; j++) {
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bool bit = (key_byte >> j) & 0x01;
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if(!onewire_slave_send_bit(bus, bit)) return;
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if(!onewire_slave_send_bit(bus, !bit)) return;
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onewire_slave_receive_bit(bus);
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if(bus->error != NO_ERROR) return;
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}
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}
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}
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bool onewire_slave_receive_and_process_cmd(OneWireSlave* bus) {
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uint8_t cmd;
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onewire_slave_receive(bus, &cmd, 1);
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if(bus->error == RESET_IN_PROGRESS)
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return true;
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else if(bus->error != NO_ERROR)
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return false;
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switch(cmd) {
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case 0xF0:
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// SEARCH ROM
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onewire_slave_cmd_search_rom(bus);
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return true;
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case 0x0F:
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case 0x33:
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// READ ROM
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onewire_device_send_id(bus->device);
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return true;
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default: // Unknown command
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bus->error = INCORRECT_ONEWIRE_CMD;
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return false;
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}
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}
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bool onewire_slave_bus_start(OneWireSlave* bus) {
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bool result = true;
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if(bus->device == NULL) {
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result = false;
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} else {
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FURI_CRITICAL_ENTER();
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furi_hal_ibutton_start_drive_in_isr();
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bus->error = NO_ERROR;
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if(onewire_slave_show_presence(bus)) {
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// TODO think about multiple command cycles
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onewire_slave_receive_and_process_cmd(bus);
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result = (bus->error == NO_ERROR || bus->error == INCORRECT_ONEWIRE_CMD);
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} else {
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result = false;
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}
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furi_hal_ibutton_start_interrupt_in_isr();
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FURI_CRITICAL_EXIT();
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}
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return result;
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}
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static void exti_cb(void* context) {
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OneWireSlave* bus = context;
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volatile bool input_state = furi_hal_ibutton_pin_get_level();
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static uint32_t pulse_start = 0;
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if(input_state) {
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uint32_t pulse_length =
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(DWT->CYCCNT - pulse_start) / furi_hal_cortex_instructions_per_microsecond();
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if(pulse_length >= OWS_RESET_MIN) {
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if(pulse_length <= OWS_RESET_MAX) {
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// reset cycle ok
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bool result = onewire_slave_bus_start(bus);
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if(result && bus->result_cb != NULL) {
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bus->result_cb(bus->result_cb_ctx);
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}
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} else {
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bus->error = VERY_LONG_RESET;
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}
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} else {
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bus->error = VERY_SHORT_RESET;
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}
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} else {
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//FALL event
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pulse_start = DWT->CYCCNT;
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}
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};
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/*********************** PUBLIC ***********************/
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OneWireSlave* onewire_slave_alloc() {
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OneWireSlave* bus = malloc(sizeof(OneWireSlave));
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bus->error = NO_ERROR;
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bus->device = NULL;
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bus->result_cb = NULL;
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bus->result_cb_ctx = NULL;
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return bus;
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}
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void onewire_slave_free(OneWireSlave* bus) {
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onewire_slave_stop(bus);
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free(bus);
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}
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void onewire_slave_start(OneWireSlave* bus) {
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furi_hal_ibutton_add_interrupt(exti_cb, bus);
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furi_hal_ibutton_start_interrupt();
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}
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void onewire_slave_stop(OneWireSlave* bus) {
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UNUSED(bus);
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furi_hal_ibutton_stop();
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furi_hal_ibutton_remove_interrupt();
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}
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void onewire_slave_attach(OneWireSlave* bus, OneWireDevice* device) {
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bus->device = device;
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onewire_device_attach(device, bus);
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}
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void onewire_slave_detach(OneWireSlave* bus) {
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if(bus->device != NULL) {
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onewire_device_detach(bus->device);
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}
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bus->device = NULL;
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}
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void onewire_slave_set_result_callback(
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OneWireSlave* bus,
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OneWireSlaveResultCallback result_cb,
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void* context) {
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bus->result_cb = result_cb;
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bus->result_cb_ctx = context;
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}
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bool onewire_slave_send(OneWireSlave* bus, const uint8_t* address, const uint8_t data_length) {
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uint8_t bytes_sent = 0;
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furi_hal_ibutton_pin_high();
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// bytes loop
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for(; bytes_sent < data_length; ++bytes_sent) {
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const uint8_t data_byte = address[bytes_sent];
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// bit loop
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for(uint8_t bit_mask = 0x01; bit_mask != 0; bit_mask <<= 1) {
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if(!onewire_slave_send_bit(bus, bit_mask & data_byte)) {
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// if we cannot send first bit
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if((bit_mask == 0x01) && (bus->error == AWAIT_TIMESLOT_TIMEOUT_HIGH))
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bus->error = FIRST_BIT_OF_BYTE_TIMEOUT;
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return false;
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}
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}
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}
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return true;
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}
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bool onewire_slave_receive(OneWireSlave* bus, uint8_t* data, const uint8_t data_length) {
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uint8_t bytes_received = 0;
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furi_hal_ibutton_pin_high();
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for(; bytes_received < data_length; ++bytes_received) {
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uint8_t value = 0;
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for(uint8_t bit_mask = 0x01; bit_mask != 0; bit_mask <<= 1) {
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if(onewire_slave_receive_bit(bus)) value |= bit_mask;
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}
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data[bytes_received] = value;
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}
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return (bytes_received != data_length);
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}
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