/*JSON{
"type" : "staticmethod",
"ifndef" : "SAVE_ON_FLASH",
"class" : "Storage",
"name" : "readArrayBuffer",
"generate" : "jswrap_storage_readArrayBuffer",
"params" : [
["name","JsVar","The filename - max 8 characters (case sensitive)"]
],
"return" : ["JsVar","An ArrayBuffer containing data from the file, or undefined"]
}
Read a file from the flash storage area that has
been written with `require("Storage").write(...)`,
and return the raw binary data as an ArrayBuffer.
This can be used:
* In a `DataView` with `new DataView(require("Storage").readArrayBuffer("x"))`
* In a `Uint8Array/Float32Array/etc` with `new Uint8Array(require("Storage").readArrayBuffer("x"))`
*/
JsVar *jswrap_storage_readArrayBuffer(JsVar *name) {
JsVar *v = jsfReadFile(jsfNameFromVar(name));
if (!v) return 0;
JsVar *r = jsvNewArrayBufferFromString(v, 0);
jsvUnLock(v);
return r;
}
/*JSON{
"type" : "constructor",
"class" : "ArrayBuffer",
"name" : "ArrayBuffer",
"generate" : "jswrap_arraybuffer_constructor",
"params" : [
["byteLength","int","The length in Bytes"]
],
"return" : ["JsVar","An ArrayBuffer object"]
}
Create an Array Buffer object
*/
JsVar *jswrap_arraybuffer_constructor(JsVarInt byteLength) {
if (byteLength <= 0 || byteLength>65535) {
jsExceptionHere(JSET_ERROR, "Invalid length for ArrayBuffer\n");
return 0;
}
if (byteLength > JSV_ARRAYBUFFER_MAX_LENGTH) {
jsExceptionHere(JSET_ERROR, "ArrayBuffer too long\n");
return 0;
}
JsVar *arrData = jsvNewStringOfLength((unsigned int)byteLength);
if (!arrData) return 0;
JsVar *v = jsvNewArrayBufferFromString(arrData, (unsigned int)byteLength);
jsvUnLock(arrData);
return v;
}
/*JSON{
"type" : "constructor",
"class" : "ArrayBuffer",
"name" : "ArrayBuffer",
"generate" : "jswrap_arraybuffer_constructor",
"params" : [
["byteLength","int","The length in Bytes"]
],
"return" : ["JsVar","An ArrayBuffer object"]
}
Create an Array Buffer object
*/
JsVar *jswrap_arraybuffer_constructor(JsVarInt byteLength) {
if (byteLength < 0 || byteLength>65535) {
jsExceptionHere(JSET_ERROR, "Invalid length for ArrayBuffer\n");
return 0;
}
if (byteLength > JSV_ARRAYBUFFER_MAX_LENGTH) {
jsExceptionHere(JSET_ERROR, "ArrayBuffer too long\n");
return 0;
}
// try and use a flat string - which will be faster
JsVar *arrData = 0;
/* if the bytes could fit into 1 or 2 normal string blocks, do that.
* It's faster to allocate and can use less memory (if it fits into one block) */
if (byteLength > JSV_FLAT_STRING_BREAK_EVEN)
arrData = jsvNewFlatStringOfLength((unsigned int)byteLength);
// if we haven't found one, spread it out
if (!arrData)
arrData = jsvNewStringOfLength((unsigned int)byteLength, NULL);
if (!arrData) return 0;
JsVar *v = jsvNewArrayBufferFromString(arrData, (unsigned int)byteLength);
jsvUnLock(arrData);
return v;
}
/**@brief Function for the application's SoftDevice event handler.
*
* @param[in] p_ble_evt SoftDevice event.
*/
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
uint32_t err_code;
switch (p_ble_evt->header.evt_id) {
case BLE_GAP_EVT_TIMEOUT:
// the timeout for sd_ble_gap_adv_start expired - kick it off again
jswrap_nrf_bluetooth_startAdvertise();
break;
case BLE_GAP_EVT_CONNECTED:
m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
bleStatus &= ~BLE_IS_SENDING; // reset state - just in case
jsiSetConsoleDevice( EV_BLUETOOTH );
break;
case BLE_GAP_EVT_DISCONNECTED:
m_conn_handle = BLE_CONN_HANDLE_INVALID;
jsiSetConsoleDevice( DEFAULT_CONSOLE_DEVICE );
// restart advertising after disconnection
jswrap_nrf_bluetooth_startAdvertise();
break;
case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
// Pairing not supported
err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
APP_ERROR_CHECK(err_code);
break;
case BLE_GATTS_EVT_SYS_ATTR_MISSING:
// No system attributes have been stored.
err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
APP_ERROR_CHECK(err_code);
break;
case BLE_EVT_TX_COMPLETE:
// UART Transmit finished - we can try and send more data
bleStatus &= ~BLE_IS_SENDING;
jswrap_nrf_transmit_string();
break;
case BLE_GAP_EVT_ADV_REPORT: {
// Advertising data received
const ble_gap_evt_adv_report_t *p_adv = &p_ble_evt->evt.gap_evt.params.adv_report;
JsVar *evt = jsvNewObject();
if (evt) {
jsvObjectSetChildAndUnLock(evt, "rssi", jsvNewFromInteger(p_adv->rssi));
jsvObjectSetChildAndUnLock(evt, "addr", jsvVarPrintf("%02x:%02x:%02x:%02x:%02x:%02x",
p_adv->peer_addr.addr[5],
p_adv->peer_addr.addr[4],
p_adv->peer_addr.addr[3],
p_adv->peer_addr.addr[2],
p_adv->peer_addr.addr[1],
p_adv->peer_addr.addr[0]));
JsVar *data = jsvNewStringOfLength(p_adv->dlen);
if (data) {
jsvSetString(data, p_adv->data, p_adv->dlen);
JsVar *ab = jsvNewArrayBufferFromString(data, p_adv->dlen);
jsvUnLock(data);
jsvObjectSetChildAndUnLock(evt, "data", ab);
}
jsiQueueObjectCallbacks(execInfo.root, BLE_SCAN_EVENT, &evt, 1);
jsvUnLock(evt);
}
break;
}
default:
// No implementation needed.
break;
}
}
/*JSON{
"type" : "staticmethod",
"class" : "E",
"name" : "toArrayBuffer",
"generate" : "jswrap_espruino_toArrayBuffer",
"params" : [
["str","JsVar","The string to convert to an ArrayBuffer"]
],
"return" : ["JsVar","An ArrayBuffer that uses the given string"],
"return_object" : "ArrayBufferView"
}
Create an ArrayBuffer from the given string. This is done via a reference, not a copy - so it is very fast and memory efficient.
Note that this is an ArrayBuffer, not a Uint8Array. To get one of those, do: `new Uint8Array(E.toArrayBuffer('....'))`.
*/
JsVar *jswrap_espruino_toArrayBuffer(JsVar *str) {
if (!jsvIsString(str)) return 0;
return jsvNewArrayBufferFromString(str, 0);
}
