I am following the turtorial in the Github and build a project which add a custom service. The project can read, write and notify between the board and mobile nRF connect application. But it can only transmit one byte in heximal. How can I change it to transfer float number?
This the turtorial website: https://github.com/NordicPlayground/nRF52-Bluetooth-Course
This is the code which transfer the data. I have tried to change the type of custom_value to float, but there is no effect.
uint32_t ble_cus_custom_value_update(ble_cus_t * p_cus, uint8_t custom_value)
{
NRF_LOG_INFO("In ble_cus_custom_value_update. \r\n");
if (p_cus == NULL)
{
return NRF_ERROR_NULL;
}
uint32_t err_code = NRF_SUCCESS;
ble_gatts_value_t gatts_value;
// Initialize value struct.
memset(&gatts_value, 0, sizeof(gatts_value));
gatts_value.len = sizeof(uint8_t);
gatts_value.offset = 0;
gatts_value.p_value = &custom_value;
// Update database.
err_code = sd_ble_gatts_value_set(p_cus->conn_handle,
p_cus->custom_value_handles.value_handle,
&gatts_value);
if (err_code != NRF_SUCCESS)
{
return err_code;
}
// Send value if connected and notifying.
if ((p_cus->conn_handle != BLE_CONN_HANDLE_INVALID))
{
ble_gatts_hvx_params_t hvx_params;
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = p_cus->custom_value_handles.value_handle;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
hvx_params.offset = gatts_value.offset;
hvx_params.p_len = &gatts_value.len;
hvx_params.p_data = gatts_value.p_value;
err_code = sd_ble_gatts_hvx(p_cus->conn_handle, &hvx_params);
}
else
{
err_code = NRF_ERROR_INVALID_STATE;
}
return err_code;
}
