Refresh C Programming

Sat, 11 Nov 2023 00:00:00 +0000

Convert void data-type (byte array) to uint8_t type

static uint8_t notify_func(const void *data)
{
 uint8_t value = ((uint8_t *)data)[7];
 return value;
}

Structure data-type as function arguments

static uint8_t notify_func(struct bt_gatt_subscribe_params *params)
{
 printk("value_handle : %d", params->value_handle)
}

Declare enums as types

typedef enum {
 STRING,
 NUMBERS,
 COMPLEX,
 DATATYPE_COUNT,
 INVALID_SENSOR
} sensor_datatype_t;

String initialisation to char pointer


const char *p_mac_addr = "0C:8C:DC:41:E1:EF";

static void print_mac_addr(void)
{
 printk("p_mac_addr : %s\n", p_mac_addr)
}

String as function return values

char* get_sensor_mac_addr(void){
 return p_mac_addr;
}

Parse unsigned int from byte array pointer

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