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Home » U++ Library support » U++ Core » LoadFile("/sys/devices/virtual/thermal/ ...") does not work
Re: LoadFile("/sys/devices/virtual/thermal/ ...") does not work [message #58278 is a reply to message #58259] Fri, 08 April 2022 16:11 Go to previous messageGo to previous message
mirek is currently offline  mirek
Messages: 13986
Registered: November 2005
Ultimate Member
Tom1 wrote on Wed, 06 April 2022 12:29
Hi,

I attempted to read Raspberry Pi 4 SoC temperature with the below code. For some reason using LoadFile does not work:
double	GetRaspberryPiTemperature(){
	String result = LoadFile("/sys/devices/virtual/thermal/thermal_zone0/temp");
	if(!result.IsEmpty()) return 0.001*ScanDouble(~result);
	return -55.0;
}

So I had to revert using FILE and fgets instead:
double	GetRaspberryPiTemperature(){
	FILE *in=fopen("/sys/devices/virtual/thermal/thermal_zone0/temp","rb");
	char s[8];
	if(fgets(s,8,in)) return 0.001*ScanDouble(s);
	return -55.0;
}

Is this expected or is this a bug?

Best regards,

Tom


Have you tried the exact equivalent? (like reading 8 bytes only).
 
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