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This commit is contained in:
Niel Nielsen
2026-05-01 18:45:52 +02:00
committed by GitHub
parent 8555f86c22
commit f7feda5dc9
1 changed files with 40 additions and 20 deletions
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firmware/application/src/rfid/nfctag/lf/lf_tag_em.c
+40 -20
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@@ -24,7 +24,6 @@
NRF_LOG_MODULE_REGISTER();
#define ANT_NO_MOD() nrf_gpio_pin_clear(LF_MOD)
#define LF_125KHZ_BROADCAST_MAX (10)
// Whether the USB light effect is allowed to enable
extern bool g_usb_led_marquee_enable;
@@ -43,7 +42,8 @@ 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
// LPCOMP stays enabled (DETECT_CROSS) — no INTENSET/INTENCLR needed.
// Re-arm LPCOMP so the next field appearance triggers lpcomp_event_handler.
NRF_LPCOMP->INTENSET = LPCOMP_INTENSET_UP_Msk;
// 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");
@@ -68,29 +68,39 @@ bool is_lf_field_exists(void) {
* priority is set to APP_IRQ_PRIORITY_HIGH).
*/
static void lpcomp_event_handler(nrf_lpcomp_event_t event) {
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)");
// 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;
}
sleep_timer_stop(); // turn off dormant delay
// Disable LPCOMP during emulation — LF_RSSI fluctuates during load
// modulation and would trigger spurious DOWN events with DETECT_CROSS.
// Field-loss is checked periodically via EVT_END_SEQ0 in pwm_handler.
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()
// Loop continuously — no stop/restart gaps between sequence plays.
// Field-loss is detected in pwm_handler via EVT_END_SEQ0.
nrfx_pwm_simple_playback(&m_broadcast, m_pwm_seq, 1, NRFX_PWM_FLAG_LOOP);
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_CROSS;
cfg.hal.detection = NRF_LPCOMP_DETECT_UP;
cfg.hal.hyst = NRF_LPCOMP_HYST_50mV;
ret_code_t err_code = nrfx_lpcomp_init(&cfg, lpcomp_event_handler);
@@ -98,8 +108,18 @@ 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_END_SEQ0) {
// Fired at end of each loop iteration — check field without stopping PWM.
// Disable LPCOMP interrupts briefly while we sample to avoid re-entrancy.
NRF_LPCOMP->INTENCLR = LPCOMP_INTENCLR_UP_Msk | LPCOMP_INTENCLR_DOWN_Msk | LPCOMP_INTENCLR_CROSS_Msk;
if (!is_lf_field_exists()) {
// Field gone — stop the loop; pwm_handler will get EVT_STOPPED next.
nrfx_pwm_stop(&m_broadcast, false);
}
// Re-enable will happen either in lf_field_lost (via INTENSET) or stays
// suppressed while PWM keeps looping (we only need it after field_lost).
return;
}
if (event_type != NRFX_PWM_EVT_STOPPED) {
return;
}