PWM implementation for dimming.

Question

Hi, 
 I tried adding PWM for turning on/off the LED's on the DK for the Enocean switch example. It worked well. 
 I tried to perform dimming on the switch example by restricting the increasing or decreasing brightness using the RELEASE_ACTION as follows. 
 
 if (p_status->b0 && timer_diff(timestamp, m_switch_state[index].b0_ts) > SWITCH_DEBOUNCE_INTERVAL_US)
 {
 m_switch_state[index].b0_ts = timestamp;
 set_params.on_off = APP_STATE_ON;
 app_pwm_enable(&PWM1);	
 for (uint32_t i=90; i > 50; i--)
 {
 while ( app_pwm_channel_duty_set(&PWM1, 0, i) == NRF_ERROR_BUSY);
 nrf_delay_ms(100); if(p_status->action == RELEASE_ACTION) { break; }
 }
 status = generic_onoff_client_set_unack(&m_clients[1], &set_params, &transition_params, APP_UNACK_MSG_REPEAT_COUNT); } But when I release the button to stop the dimming, the release action is not getting recorded immediately. I can see the release action after the PWM is implemented completely(till duty cycle of 50). How can I solve the issue to stop the dimming once I release the switch. I know that the experimental_dimming example contains generic level model but I would like to know why this code isn't functioning properly. Thank you.

Mttrinh · Accepted Answer

Hi,

I have attached a file. Search for modified in the code and you should see the parts I modified. I have removed a little bit of code just to show what I mean. This is just to show you how you can do it, and might need some modifications to suit your needs. The idea is to have a volatile variable that you can update whenever a button is pressed/released. The code will be running in main, and since the interrupt have higher priority the variable will be updated when you press/release button and then returned to main.

Fullscreen main(1).c Download

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 */

#include <stdio.h>

/* HAL */
#include "boards.h"
#include "nrf_delay.h"
#include "simple_hal.h"
#include "app_timer.h"

/* Core */
#include "nrf_mesh.h"
#include "nrf_mesh_events.h"
#include "nrf_mesh_assert.h"
#include "flash_manager.h"
#include "mesh_stack.h"
#include "access_config.h"

/* Provisioning and configuration */
#include "nrf_mesh_configure.h"
#include "mesh_provisionee.h"
#include "mesh_app_utils.h"
#include "mesh_softdevice_init.h"

/* Models */
#include "generic_onoff_client.h"

/* Logging and RTT */
#include "rtt_input.h"
#include "log.h"

/* Example specific includes */
#include "app_config.h"
#include "enocean_switch_example.h"
#include "nrf_mesh_config_examples.h"
#include "nrf_mesh_configure.h"
#include "enocean.h"
#include "flash_helper.h"
#include "example_common.h"

/* Configure switch debounce timeout for EnOcean switch here */
#define SWITCH_DEBOUNCE_INTERVAL_US (MS_TO_US(500))
/* Two EnOcean switches can be used in parallel */
#define MAX_ENOCEAN_DEVICES_SUPPORTED (2)

#define APP_STATE_OFF                 (0)
#define APP_STATE_ON                  (1)

#define APP_UNACK_MSG_REPEAT_COUNT    (2)

#define LIGHT_SWITCH_CLIENTS          (PTM215B_NUMBER_OF_SWITCHES/2)

// modified_
volatile bool m_dim = false;
volatile bool m_dim_state = 0;

typedef struct
{
    uint32_t a0_ts;
    uint32_t a1_ts;
    uint32_t b0_ts;
    uint32_t b1_ts;
} app_switch_debounce_state_t;

/** Single advertiser instance. May periodically transmit one packet at a time. */
static generic_onoff_client_t m_clients[LIGHT_SWITCH_CLIENTS];
static bool m_device_provisioned;

static app_secmat_flash_t m_app_secmat_flash[MAX_ENOCEAN_DEVICES_SUPPORTED];
static enocean_commissioning_secmat_t m_app_secmat[MAX_ENOCEAN_DEVICES_SUPPORTED];
static uint8_t  m_enocean_dev_cnt;
static app_switch_debounce_state_t m_switch_state[MAX_ENOCEAN_DEVICES_SUPPORTED];

/* Forward declaration */
static void app_gen_onoff_client_publish_interval_cb(access_model_handle_t handle, void * p_self);
static void app_generic_onoff_client_status_cb(const generic_onoff_client_t * p_self,
                                               const access_message_rx_meta_t * p_meta,
                                               const generic_onoff_status_params_t * p_in);
static void app_gen_onoff_client_transaction_status_cb(access_model_handle_t model_handle,
                                                       void * p_args,
                                                       access_reliable_status_t status);
static void app_mesh_core_event_cb (const nrf_mesh_evt_t * p_evt);
static void app_start(void);

static nrf_mesh_evt_handler_t m_mesh_core_event_handler = { .evt_cb = app_mesh_core_event_cb };

const generic_onoff_client_callbacks_t client_cbs =
{
    .onoff_status_cb = app_generic_onoff_client_status_cb,
    .ack_transaction_status_cb = app_gen_onoff_client_transaction_status_cb,
    .periodic_publish_cb = app_gen_onoff_client_publish_interval_cb
};

/* Try to store app data. If busy, ask user to manually initiate operation. */
static void app_data_store_try(void)
{
    uint32_t status = app_flash_data_store(APP_DATA_ENTRY_HANDLE, &m_app_secmat_flash[0], sizeof(m_app_secmat_flash));
    if (status == NRF_SUCCESS)
    {
        __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Storing: Enocean security material\n");
    }
    else if (status == NRF_ERROR_NOT_SUPPORTED)
    {
       __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Cannot store: Persistent storage not enabled\n");
    }
    else
    {
        __LOG(LOG_SRC_APP, LOG_LEVEL_ERROR, "Flash busy. Cannot store. Press Button 2 to try again. \n");
    }
}

static uint8_t enocean_device_index_get(enocean_evt_t * p_evt)
{
    uint8_t i;
    for (i = 0; i < m_enocean_dev_cnt; i++)
    {
        if (memcmp(p_evt->p_ble_gap_addr, m_app_secmat[i].p_ble_gap_addr, BLE_GAP_ADDR_LEN) == 0)
        {
            break;
        }
    }

    /* This should never assert. */
    if (i == m_enocean_dev_cnt)
    {
        APP_ERROR_CHECK(false);
    }

    return i;
}

/* Forward the ADV packets to the Enocean module */
static void rx_callback(const nrf_mesh_adv_packet_rx_data_t * p_rx_data)
{
    enocean_packet_process(p_rx_data);
}

static void app_switch_debounce(enocean_switch_status_t * p_status, uint8_t index)
{
    uint32_t timestamp = timer_now();
    uint32_t status = NRF_ERROR_INTERNAL;
    generic_onoff_set_params_t set_params;
    model_transition_t transition_params;
    static uint8_t tid = 0;

    set_params.tid = tid++;
    transition_params.delay_ms = APP_CONFIG_ONOFF_DELAY_MS;
    transition_params.transition_time_ms = APP_CONFIG_ONOFF_TRANSITION_TIME_MS;

    if (p_status->action == PRESS_ACTION)
    {	
		// modified_

        // start dimmming;
        m_dim = true;

//        /* Change state on the unicast server address using 1st on/off client */
//        if (p_status->a0 && timer_diff(timestamp, m_switch_state[index].a0_ts) > SWITCH_DEBOUNCE_INTERVAL_US)
//        {
//            m_switch_state[index].a0_ts = timestamp;
//            set_params.on_off = APP_STATE_ON;
//            hal_led_pin_set(BSP_LED_0, set_params.on_off);
//            status = generic_onoff_client_set(&m_clients[0], &set_params, &transition_params);
//        }
//        else if (p_status->a1 && timer_diff(timestamp, m_switch_state[index].a1_ts) > SWITCH_DEBOUNCE_INTERVAL_US)
//        {
//            m_switch_state[index].a1_ts = timestamp;
//            set_params.on_off = APP_STATE_OFF;
//            hal_led_pin_set(BSP_LED_0, set_params.on_off);
//            status = generic_onoff_client_set(&m_clients[0], &set_params, &transition_params);
//        }
//
//        if (status == NRF_SUCCESS)
//        {
//            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Sending msg: Client[0]: ONOFF SET %d\n", set_params.on_off);
//        }
//        status = NRF_ERROR_INTERNAL;
//
//        /* Change state on the nodes subscribed to the Odd group address using 2nd on/off client */
//        if (p_status->b0 && timer_diff(timestamp, m_switch_state[index].b0_ts) > SWITCH_DEBOUNCE_INTERVAL_US)
//        {
//            m_switch_state[index].b0_ts = timestamp;
//            set_params.on_off = APP_STATE_ON;
//            hal_led_pin_set(BSP_LED_1, set_params.on_off);
//            status = generic_onoff_client_set_unack(&m_clients[1], &set_params, &transition_params, APP_UNACK_MSG_REPEAT_COUNT);
//        }
//        else if (p_status->b1 && timer_diff(timestamp, m_switch_state[index].b1_ts) > SWITCH_DEBOUNCE_INTERVAL_US)
//        {
//            m_switch_state[index].b1_ts = timestamp;
//            set_params.on_off = APP_STATE_OFF;
//            hal_led_pin_set(BSP_LED_1, set_params.on_off);
//            status = generic_onoff_client_set_unack(&m_clients[1], &set_params, &transition_params, APP_UNACK_MSG_REPEAT_COUNT);
//        }
//
//        if (status == NRF_SUCCESS)
//        {
//            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Sending msg: Client[1]: ONOFF SET %d\n", set_params.on_off);
//        }
    
	// modified_
	}
    else if (p_status->action == PRESS_ACTION)
    {
        // stop dimming;
        m_dim = false;
    }
}

/* This example translates the messages from the PTM215B switches to on/off client model messages.
The mapping of the switches and corresponding client model messages is as follows:

Pressing Switch 1 will turn ON LED 1 on the servers with ODD addresses.
Pressing Switch 2 will turn OFF LED 1 on the servers with ODD addresses.
Pressing Switch 3 will turn ON LED 1 on the servers with EVEN addresses.
Pressing Switch 4 will turn OFF LED 1 on the servers with EVEN addresses.
*/
static void app_enocean_cb(enocean_evt_t * p_evt)
{
    if  (p_evt->type == ENOCEAN_EVT_DATA_RECEIVED)
    {
        __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Sw data A0: %d A1: %d B0: %d B1: %d Action: %d\n",
              p_evt->params.data.status.a0,p_evt->params.data.status.a1,p_evt->params.data.status.b0,
              p_evt->params.data.status.b1,p_evt->params.data.status.action);

        app_switch_debounce(&p_evt->params.data.status, enocean_device_index_get(p_evt));
    }
    else if (p_evt->type == ENOCEAN_EVT_SECURITY_MATERIAL_RECEIVED)
    {
        if (m_enocean_dev_cnt < MAX_ENOCEAN_DEVICES_SUPPORTED)
        {
            m_app_secmat_flash[m_enocean_dev_cnt].seq = p_evt->params.secmat.seq;
            memcpy(&m_app_secmat_flash[m_enocean_dev_cnt].ble_gap_addr[0],
                   p_evt->p_ble_gap_addr, BLE_GAP_ADDR_LEN);
            memcpy(&m_app_secmat_flash[m_enocean_dev_cnt].key[0],
                   p_evt->params.secmat.p_key, PTM215B_COMM_PACKET_KEY_SIZE);

            app_data_store_try();

            m_app_secmat[m_enocean_dev_cnt].p_seq =  &m_app_secmat_flash[m_enocean_dev_cnt].seq;
            m_app_secmat[m_enocean_dev_cnt].p_ble_gap_addr = &m_app_secmat_flash[m_enocean_dev_cnt].ble_gap_addr[0];
            m_app_secmat[m_enocean_dev_cnt].p_key = &m_app_secmat_flash[m_enocean_dev_cnt].key[0];
            enocean_secmat_add(&m_app_secmat[m_enocean_dev_cnt]);

            m_enocean_dev_cnt++;

            hal_led_blink_ms(LEDS_MASK, LED_BLINK_INTERVAL_MS, LED_BLINK_CNT_PROV);
        }
        else
        {
            __LOG(LOG_SRC_APP, LOG_LEVEL_ERROR, "Cannot add new device. Max number of supported devices: %d\n", MAX_ENOCEAN_DEVICES_SUPPORTED);
        }
    }
}

/* This callback is called periodically if model is configured for periodic publishing */
static void app_gen_onoff_client_publish_interval_cb(access_model_handle_t handle, void * p_self)
{
     __LOG(LOG_SRC_APP, LOG_LEVEL_WARN, "Publish desired message here.\n");
}

/* Acknowledged transaction status callback, if acknowledged transfer fails, application can
* determine suitable course of action (e.g. re-initiate previous transaction) by using this
* callback.
*/
static void app_gen_onoff_client_transaction_status_cb(access_model_handle_t model_handle,
                                                       void * p_args,
                                                       access_reliable_status_t status)
{
    switch(status)
    {
        case ACCESS_RELIABLE_TRANSFER_SUCCESS:
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Acknowledged transfer success.\n");
            break;

        case ACCESS_RELIABLE_TRANSFER_TIMEOUT:
            hal_led_blink_ms(LEDS_MASK, LED_BLINK_SHORT_INTERVAL_MS, LED_BLINK_CNT_NO_REPLY);
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Acknowledged transfer timeout.\n");
            break;

        case ACCESS_RELIABLE_TRANSFER_CANCELLED:
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Acknowledged transfer cancelled.\n");
            break;

        default:
            ERROR_CHECK(NRF_ERROR_INTERNAL);
            break;
    }
}

/* Generic OnOff client model interface: Process the received status message in this callback */
static void app_generic_onoff_client_status_cb(const generic_onoff_client_t * p_self,
                                               const access_message_rx_meta_t * p_meta,
                                               const generic_onoff_status_params_t * p_in)
{
    if (p_in->remaining_time_ms > 0)
    {
        __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "OnOff server: 0x%04x, Present OnOff: %d, Target OnOff: %d, Remaining Time: %d ms\n",
              p_meta->src.value, p_in->present_on_off, p_in->target_on_off, p_in->remaining_time_ms);
    }
    else
    {
        __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "OnOff server: 0x%04x, Present OnOff: %d\n",
              p_meta->src.value, p_in->present_on_off);
    }
}

static void node_reset(void)
{
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "----- Node reset  -----\n");
    hal_led_blink_ms(LEDS_MASK, LED_BLINK_INTERVAL_MS, LED_BLINK_CNT_RESET);
    /* This function may return if there are ongoing flash operations. */
    mesh_stack_device_reset();
}

static void config_server_evt_cb(const config_server_evt_t * p_evt)
{
    if (p_evt->type == CONFIG_SERVER_EVT_NODE_RESET)
    {
        node_reset();
    }
}

static void button_event_handler(uint32_t button_number)
{
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Button %u pressed\n", button_number);

    switch (button_number)
    {
        /* Press SW1 to store latest sequence number.
        USER_NOTE: End product should implement a mechanism to trigger this process upon
        external event, such as power fail interrupt, and ensure that the device finishes flash writes
        before running out of power. */
        case 1:
        {
            app_data_store_try();
            break;
        }

        /* Initiate node reset */
        case 3:
        {
            /* Clear all the states to reset the node. */
            mesh_stack_config_clear();
            app_flash_clear(&m_app_secmat_flash[0], sizeof(m_app_secmat_flash));
            node_reset();
            break;
        }

        default:
            break;
    }
}

static void app_mesh_core_event_cb(const nrf_mesh_evt_t * p_evt)
{
    /* USER_NOTE: User can insert mesh core event proceesing here */
    switch (p_evt->type)
    {
        /* Start user application specific functions only when flash is stable */
        case NRF_MESH_EVT_FLASH_STABLE:
            __LOG(LOG_SRC_APP, LOG_LEVEL_DBG1, "Mesh evt: FLASH_STABLE \n");
            {
                static bool s_app_started;
                if (!s_app_started)
                {
                    /* Flash operation initiated during initialization has been completed */
                    app_start();
                    s_app_started = true;
                }
            }
            break;

        default:
            break;
    }
}

static void models_init_cb(void)
{
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Initializing and adding models\n");

    /* Model initialization */
    for (uint32_t i = 0; i < LIGHT_SWITCH_CLIENTS; ++i)
    {
        m_clients[i].settings.p_callbacks = &client_cbs;
        m_clients[i].settings.timeout = 0;
        m_clients[i].settings.force_segmented = APP_CONFIG_FORCE_SEGMENTATION;
        m_clients[i].settings.transmic_size = APP_CONFIG_MIC_SIZE;

        ERROR_CHECK(generic_onoff_client_init(&m_clients[i], i + 1));
    }
}

static void provisioning_complete_cb(void)
{
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Successfully provisioned\n");

    dsm_local_unicast_address_t node_address;
    dsm_local_unicast_addresses_get(&node_address);
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Node Address: 0x%04x \n", node_address.address_start);

    hal_led_mask_set(LEDS_MASK, LED_MASK_STATE_OFF);
    hal_led_blink_ms(LEDS_MASK, LED_BLINK_INTERVAL_MS, LED_BLINK_CNT_PROV);
}

static void app_rtt_input_handler(int key)
{
    if (key >= '0' && key <= '3')
    {
        uint32_t button_number = key - '0';
        button_event_handler(button_number);
    }
}

static void mesh_init(void)
{
    uint8_t dev_uuid[NRF_MESH_UUID_SIZE];
    uint8_t node_uuid_prefix[NODE_UUID_PREFIX_LEN] = CLIENT_NODE_UUID_PREFIX;

    ERROR_CHECK(mesh_app_uuid_gen(dev_uuid, node_uuid_prefix, NODE_UUID_PREFIX_LEN));
    mesh_stack_init_params_t init_params =
    {
        .core.irq_priority       = NRF_MESH_IRQ_PRIORITY_LOWEST,
        .core.lfclksrc           = DEV_BOARD_LF_CLK_CFG,
        .core.p_uuid             = dev_uuid,
        .models.models_init_cb   = models_init_cb,
        .models.config_server_cb = config_server_evt_cb
    };
    ERROR_CHECK(mesh_stack_init(&init_params, &m_device_provisioned));

    /* Register event handler to receive NRF_MESH_EVT_FLASH_STABLE. Application functionality will
    be started after this event */
    nrf_mesh_evt_handler_add(&m_mesh_core_event_handler);
}

static void initialize(void)
{
    __LOG_INIT(LOG_SRC_APP | LOG_SRC_ACCESS , LOG_LEVEL_INFO, LOG_CALLBACK_DEFAULT);
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "----- BLE Mesh Enocean Switch Translator Demo -----\n");

    ERROR_CHECK(app_timer_init());
    hal_leds_init();

#if BUTTON_BOARD
    ERROR_CHECK(hal_buttons_init(button_event_handler));
#endif

    nrf_clock_lf_cfg_t lfc_cfg = DEV_BOARD_LF_CLK_CFG;
    ERROR_CHECK(mesh_softdevice_init(lfc_cfg));
    mesh_init();

    app_flash_init();
    enocean_translator_init(app_enocean_cb);
}

static void app_start(void)
{
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Starting application \n");

    /* Load app specific data */
    if (app_flash_data_load(APP_DATA_ENTRY_HANDLE, &m_app_secmat_flash[0], sizeof(m_app_secmat_flash)) == NRF_SUCCESS)
    {
        for (uint8_t i = 0; i < MAX_ENOCEAN_DEVICES_SUPPORTED; i++)
        {
            m_app_secmat[i].p_ble_gap_addr = &m_app_secmat_flash[i].ble_gap_addr[0];
            m_app_secmat[i].p_key = &m_app_secmat_flash[i].key[0];
            m_app_secmat[i].p_seq = &m_app_secmat_flash[i].seq;
            m_enocean_dev_cnt++;
            enocean_secmat_add(&m_app_secmat[i]);
            __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "Restored: Enocean security materials\n");
        }
    }
    else
    {
        m_enocean_dev_cnt = 0;
    }

    /* Install rx callback to intercept incoming ADV packets so that they can be passed to the
    EnOcean packet processor */
    nrf_mesh_rx_cb_set(rx_callback);
}

static void start(void)
{
    rtt_input_enable(app_rtt_input_handler, RTT_INPUT_POLL_PERIOD_MS);
    ERROR_CHECK(mesh_stack_start());

    if (!m_device_provisioned)
    {
        static const uint8_t static_auth_data[NRF_MESH_KEY_SIZE] = STATIC_AUTH_DATA;
        mesh_provisionee_start_params_t prov_start_params =
        {
            .p_static_data    = static_auth_data,
            .prov_complete_cb = provisioning_complete_cb,
            .p_device_uri = NULL
        };
        ERROR_CHECK(mesh_provisionee_prov_start(&prov_start_params));
    }

    const uint8_t *p_uuid = nrf_mesh_configure_device_uuid_get();
    __LOG_XB(LOG_SRC_APP, LOG_LEVEL_INFO, "Device UUID ", p_uuid, NRF_MESH_UUID_SIZE);

    hal_led_mask_set(LEDS_MASK, LED_MASK_STATE_OFF);
    hal_led_blink_ms(LEDS_MASK, LED_BLINK_INTERVAL_MS, LED_BLINK_CNT_START);

#if !PERSISTENT_STORAGE
    app_start();
#endif
}

int main(void)
{
    initialize();
    execution_start(start);

    for (;;)
    {
		//modified_
        while(m_dim)
        {
			if(m_dim_state == 0){
				CURRENT_LIGHT_INTENSITY--
				if(CURRENT_LIGHT_INTENSITY < 50){
					m_dim_state = 1
				}
			}
			else{
				CURRENT_LIGHT_INTENSITY++
				if(CURRENT_LIGHT_INTENSITY > 99){
					m_dim_state = 0;
				}
			}
			
            while ( app_pwm_channel_duty_set(&PWM1, 0, CURRENT_LIGHT_INTENSITY) == NRF_ERROR_BUSY);
            
            nrf_delay_ms(10);
        }
        (void)sd_app_evt_wait();
    }
}

PWM implementation for dimming.

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