ccd40497eb
* pulldown ibutton pin during rfid read * enable and handle COMP interrupts * send events from comparator IRQ and handle in app * manchester encode * successfully read em4100 * read-emulate * led
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
#include "flipper_v2.h"
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void prepare_data(uint32_t ID, uint32_t VENDOR, uint8_t* data) {
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uint8_t value[10];
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// vendor rows (4 bit in a row)
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value[0] = (VENDOR >> 4) & 0xF;
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value[1] = VENDOR & 0xF;
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const uint8_t ROW_SIZE = 4;
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const uint8_t HEADER_SIZE = 9;
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// ID rows (4 bit in a row)
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for(int i = 0; i < 8; i++) {
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value[i + 2] = (ID >> (28 - i * ROW_SIZE)) & 0xF;
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}
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for(uint8_t i = 0; i < HEADER_SIZE; i++) {
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data[i] = 1; // header
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}
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for(uint8_t i = 0; i < 10; i++) { // data
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for(uint8_t j = 0; j < ROW_SIZE; j++) {
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data[HEADER_SIZE + i * (ROW_SIZE + 1) + j] = (value[i] >> ((ROW_SIZE - 1) - j)) & 1;
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}
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// row parity
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data[HEADER_SIZE + i * (ROW_SIZE + 1) + ROW_SIZE] =
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(data[HEADER_SIZE + i * (ROW_SIZE + 1) + 0] +
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data[HEADER_SIZE + i * (ROW_SIZE + 1) + 1] +
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data[HEADER_SIZE + i * (ROW_SIZE + 1) + 2] +
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data[HEADER_SIZE + i * (ROW_SIZE + 1) + 3]) %
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2;
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}
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for(uint8_t i = 0; i < ROW_SIZE; i++) { //checksum
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uint8_t checksum = 0;
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for(uint8_t j = 0; j < 10; j++) {
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checksum += data[HEADER_SIZE + i + j * (ROW_SIZE + 1)];
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}
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data[i + 59] = checksum % 2;
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}
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data[63] = 0; // stop bit
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/*
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printf("em data: ");
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for(uint8_t i = 0; i < 64; i++) {
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printf("%d ", data[i]);
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}
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printf("\n");
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*/
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}
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void em4100_emulation(uint8_t* data, GpioPin* pin) {
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taskENTER_CRITICAL();
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gpio_write(pin, true);
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for(uint8_t i = 0; i < 8; i++) {
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for(uint8_t j = 0; j < 64; j++) {
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delay_us(270);
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gpio_write(pin, data[j]);
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delay_us(270);
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gpio_write(pin, !data[j]);
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}
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}
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gpio_write(pin, false);
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taskEXIT_CRITICAL();
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}
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