void jswrap_i2c_writeTo(JsVar *parent, JsVar *addressVar, JsVar *args) {
IOEventFlags device = jsiGetDeviceFromClass(parent);
if (!DEVICE_IS_I2C(device)) return;
bool sendStop = true;
int address = i2c_get_address(addressVar, &sendStop);
size_t l = (size_t)jsvIterateCallbackCount(args);
if (l+256 > jsuGetFreeStack()) {
jsExceptionHere(JSET_ERROR, "Not enough free stack to send this amount of data");
return;
}
unsigned char *data = (unsigned char *)alloca(l);
jsvIterateCallbackToBytes(args, data, l);
jshI2CWrite(device, (unsigned char)address, l, data, sendStop);
}
void doMeasurement() {
enableDASH();
JsVar *i2c1 = jspGetNamedField(execInfo.root, "I2C1", false);
IOEventFlags device = jsiGetDeviceFromClass(i2c1);
if (!DEVICE_IS_I2C(device)) {
blink(PIN_RED, 100);
return;
}
jsvUnLock(i2c1);
unsigned char dataPtr[2];
dataPtr[0] = CMD_MEASURE_TEMPERATURE_HOLD;
jshI2CWrite(device, (unsigned char)(CMD_TEMP_ADDR), 1, (unsigned char*)dataPtr, true);
int i = 0;
for (i=0; i<2; i++) { dataPtr[i] = 0; }
jshI2CRead(device, (unsigned char)CMD_TEMP_ADDR, 2, (unsigned char*)dataPtr, true);
int temp = ((dataPtr[0] * 256) + dataPtr[1]);
/// http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf#page=14
JsVarFloat realTemp = ((175.72f * temp) / 65536.0f) - 46.85f;
char temperatureBuffer[6] = {0};
ftoa_bounded(realTemp, temperatureBuffer, 5);
temperatureBuffer[5] = '\0';
char serialNumber[SERIAL_LEN] = {0};
getSerial(serialNumber, SERIAL_LEN);
/// Generate the JSON that we send to gateway skyand then to API{\"nodeSerial\":\"%s\",\"channel\":\"temp\",\"value\":\"%s\",\"metric\":\"c\"}');", serialNumber + SERIAL_OFFSE
jsvUnLock(messageVar);
if (doTimeout) { //regular message
messageVar = jsvVarPrintf("{\"ns\":\"%s\",\"ch\":\"t\",\"v\":\"%s\",\"m\":\"c\"}", serialNumber + SERIAL_OFFSET, temperatureBuffer);
} else { //this only happens if we forced the read
messageVar = jsvVarPrintf("{\"ns\":\"%s\",\"ch\":\"t\",\"v\":\"%s\",\"m\":\"c\",\"f\":\"y\"}", serialNumber + SERIAL_OFFSET, temperatureBuffer);
}
WDEBUG("sending on DASH: "); WDEBUGSTRVAR(messageVar); WDEBUGLN("");
JsVar *serial = jspGetNamedField(execInfo.root, SERIAL1_DASH7, false);
jswrap_serial_print(serial, messageVar);
jsvUnLock(serial);
transmittingData = true; // see jswrap_wice_idle
}