Use of nrfx_dppi with nrf5340 to control one GPIO

Question

Dear, 
 I need to generate a pulse signal on one IO following this pattern: HIGH for 12us ; LOW for 106us ; and so on... 
 I tried to use TIMER0 with NRF_TIMER_EVENT_COMPARE0 and NRF_TIMER_EVENT_COMPARE1 but the signal is often not respected (keeping one cycle the IO HIGH also during second period). So I assume I need to use dppi, but using the following code, I still not see anything happening on the io: struct gpio_dt_spec mofset_ctrl_io = GPIO_DT_SPEC_GET(DT_NODELABEL(mofset_ctrl), gpios);

#define TIMER_INSTANCE_NUMBER 0
const nrfx_timer_t timer_instance = NRFX_TIMER_INSTANCE(TIMER_INSTANCE_NUMBER);

#define TOGGLE_INTERVAL_ON_US 12
#define TOGGLE_INTERVAL_OFF_US 106

static nrfx_gpiote_t const gpiote_inst = NRFX_GPIOTE_INSTANCE(0);
static uint8_t dppi_channel;

static void timer0_init(void)
{
 nrfx_err_t err;

nrfx_timer_config_t timer_config = NRFX_TIMER_DEFAULT_CONFIG(16000000);
 timer_config.bit_width = NRF_TIMER_BIT_WIDTH_16;
 
 err = nrfx_timer_init(&timer_instance, &timer_config, NULL);
 if (err != NRFX_SUCCESS) {
 LOG_ERR("nrfx_timer_init error: %08x", err);
 return;
 }

uint32_t ticks1 = nrfx_timer_us_to_ticks(&timer_instance, TOGGLE_INTERVAL_ON_US);
 uint32_t ticks2 = nrfx_timer_us_to_ticks(&timer_instance, TOGGLE_INTERVAL_ON_US + TOGGLE_INTERVAL_OFF_US);

LOG_INF("COMPARE0: %d ticks, COMPARE1: %d ticks", ticks1, ticks2);

nrfx_timer_extended_compare(
 &timer_instance,
 NRF_TIMER_CC_CHANNEL0,
 ticks1,
 NRF_TIMER_SHORT_COMPARE1_CLEAR_MASK, // Efface le compteur apr&#232;s COMPARE1
 true
 );

nrfx_timer_extended_compare(
 &timer_instance,
 NRF_TIMER_CC_CHANNEL1,
 ticks2,
 NRF_TIMER_SHORT_COMPARE1_CLEAR_MASK, // On efface &#224; COMPARE1
 true
 );

// Connexion de l'IRQ
 IRQ_DIRECT_CONNECT(TIMER0_IRQn, 0, nrfx_timer_0_irq_handler, 0);
 irq_enable(TIMER0_IRQn);

nrfx_timer_enable(&timer_instance);
 LOG_INF("Timer started");
}

static void gpiote_dppi_init(void)
{

nrfx_err_t err;

err = nrfx_gpiote_init(&gpiote_inst, NRFX_GPIOTE_DEFAULT_CONFIG_IRQ_PRIORITY);
 if (err != NRFX_SUCCESS && err != NRFX_ERROR_ALREADY_INITIALIZED) {
 LOG_ERR("nrfx_gpiote_init error: %08x", err);
 return;
 }

nrfx_gpiote_output_config_t gpiote_config = NRFX_GPIOTE_DEFAULT_OUTPUT_CONFIG;
 err = nrfx_gpiote_output_configure(&gpiote_inst, mofset_ctrl_io.pin, &gpiote_config, NULL);
 if (err != NRFX_SUCCESS) {
 LOG_ERR("nrfx_gpiote_output_configure error: %08x", err);
 return;
 }

nrfx_gpiote_trigger_enable(&gpiote_inst, mofset_ctrl_io.pin, true);

err = nrfx_dppi_channel_alloc(&dppi_channel);
 if (err != NRFX_SUCCESS) {
 LOG_ERR("nrfx_dppi_channel_alloc error: %08x", err);
 return;
 }

nrfx_gppi_channel_endpoints_setup(dppi_channel,
 nrfx_timer_compare_event_address_get(&timer_instance, NRF_TIMER_CC_CHANNEL0),
 nrfx_gpiote_out_task_address_get(&gpiote_inst, mofset_ctrl_io.pin));
 
 nrfx_gppi_channel_endpoints_setup(dppi_channel,
 nrfx_timer_compare_event_address_get(&timer_instance, NRF_TIMER_CC_CHANNEL1),
 nrfx_gpiote_out_task_address_get(&gpiote_inst, mofset_ctrl_io.pin));

err = nrfx_dppi_channel_enable(dppi_channel);
 if (err != NRFX_SUCCESS) {
 LOG_ERR("Failed to enable DPPI channel, error: %08x", err);
 return;
 }

LOG_INF("GPIOTE + DPPI initialized");

} 
 Do you know why ? I confess it was difficult to setup this with all the API changes on that topic (add of nrfx_gpiote_t in prototypes and other changes), and I never found one full example working for nrf5340 and NCS 2.7.0 I am using. 
 Thanks in advance for your piece of advice! 
 Kind regards, 
 Michael