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This commit is contained in:
Niel Nielsen
2026-05-01 17:50:32 +02:00
committed by GitHub
parent d7b8e63966
commit c63cc16bb5
1 changed files with 20 additions and 34 deletions
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firmware/application/src/rfid/nfctag/lf/lf_tag_em.c
+20 -34
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@@ -43,7 +43,7 @@ static void lf_field_lost(void) {
g_is_tag_emulating = false; // Reset the flag in the emulation
m_is_lf_emulating = false;
TAG_FIELD_LED_OFF() // Make sure the indicator light of the LF field status
NRF_LPCOMP->INTENSET = LPCOMP_INTENCLR_CROSS_Msk | LPCOMP_INTENCLR_UP_Msk | LPCOMP_INTENCLR_DOWN_Msk | LPCOMP_INTENCLR_READY_Msk;
// LPCOMP stays enabled (DETECT_CROSS) — no INTENSET/INTENCLR needed.
// call sleep_timer_start *after* unsetting g_is_tag_emulating
sleep_timer_start(SLEEP_DELAY_MS_FIELD_125KHZ_LOST); // Start the timer to enter the sleep
NRF_LOG_INFO("LF FIELD LOST");
@@ -68,35 +68,29 @@ bool is_lf_field_exists(void) {
* priority is set to APP_IRQ_PRIORITY_HIGH).
*/
static void lpcomp_event_handler(nrf_lpcomp_event_t event) {
// Only when the lf -frequency emulation is not launched, and the analog card is started
if (m_is_lf_emulating || event != NRF_LPCOMP_EVENT_UP) {
return;
if (!m_is_lf_emulating && event == NRF_LPCOMP_EVENT_UP) {
// Field appeared — start continuous looping broadcast.
// LPCOMP stays enabled so the DOWN event stops us when field is lost.
sleep_timer_stop();
m_is_lf_emulating = true;
g_is_tag_emulating = true;
g_usb_led_marquee_enable = false;
set_slot_light_color(RGB_BLUE);
TAG_FIELD_LED_ON()
nrfx_pwm_simple_playback(&m_broadcast, m_pwm_seq, 1, NRFX_PWM_FLAG_LOOP);
NRF_LOG_INFO("LF FIELD DETECTED");
} else if (m_is_lf_emulating && event == NRF_LPCOMP_EVENT_DOWN) {
// Field dropped during emulation — stop PWM; pwm_handler will clean up.
nrfx_pwm_stop(&m_broadcast, false);
NRF_LOG_INFO("LF FIELD LOST (LPCOMP DOWN)");
}
sleep_timer_stop(); // turn off dormant delay
nrfx_lpcomp_disable();
// set the emulation status logo bit
m_is_lf_emulating = true;
g_is_tag_emulating = true;
// turn off USB light effect when emulating cards
g_usb_led_marquee_enable = false;
// LED status update
set_slot_light_color(RGB_BLUE);
TAG_FIELD_LED_ON()
// use precise hardware timer to broadcast card id
nrfx_pwm_simple_playback(&m_broadcast, m_pwm_seq, LF_125KHZ_BROADCAST_MAX, NRFX_PWM_FLAG_STOP);
NRF_LOG_INFO("LF FIELD DETECTED");
}
static void lpcomp_init(void) {
nrfx_lpcomp_config_t cfg = NRFX_LPCOMP_DEFAULT_CONFIG;
cfg.input = LF_RSSI;
cfg.hal.reference = NRF_LPCOMP_REF_SUPPLY_1_16;
cfg.hal.detection = NRF_LPCOMP_DETECT_UP;
cfg.hal.detection = NRF_LPCOMP_DETECT_CROSS;
cfg.hal.hyst = NRF_LPCOMP_HYST_50mV;
ret_code_t err_code = nrfx_lpcomp_init(&cfg, lpcomp_event_handler);
@@ -104,21 +98,13 @@ static void lpcomp_init(void) {
}
static void pwm_handler(nrfx_pwm_evt_type_t event_type) {
// In LOOP mode this only fires when nrfx_pwm_stop() is called explicitly
// (triggered by LPCOMP DOWN event when field is lost).
if (event_type != NRFX_PWM_EVT_STOPPED) {
return;
}
// after last broadcast, force NO_MOD on antenna to measure field.
ANT_NO_MOD();
bsp_delay_ms(1);
// We don't need any events, but only need to detect the state of the field
NRF_LPCOMP->INTENCLR = LPCOMP_INTENCLR_CROSS_Msk | LPCOMP_INTENCLR_UP_Msk | LPCOMP_INTENCLR_DOWN_Msk | LPCOMP_INTENCLR_READY_Msk;
if (is_lf_field_exists()) {
nrfx_lpcomp_disable();
nrfx_pwm_simple_playback(&m_broadcast, m_pwm_seq, LF_125KHZ_BROADCAST_MAX, NRFX_PWM_FLAG_STOP);
} else {
lf_field_lost();
}
lf_field_lost();
}
static void pwm_init(void) {