Stdint also has a solution to help with that as well. if you define something as uint8_t it may be more efficient on the AVR but less efficient on other processors that may have to do lots of masking on the register contents to ensure that the registers upper bits are never set.

It is much more efficient in terms of code, timing, and space to use 8 bit variables rather than 16 bit variables on the AVR. So while the AVR is only 8 bits, it must act like a 16 bit processor.īecause the AVR is only an 8 bit processor ints are much less efficient than char (8 bit) types.Īnd THAT is why you often see uint8_t or int8_t used in Arduino code. One area is the native size since it really is an 8 bit processor, but because C limits an int to be no smaller than 16 bits, an int is 16 bits on the AVR. The AVR has many issues when it comes to C. I say normally because this doesn't really hold for the AVR. When size doesn't matter, and the value is known to fit in 16 bits then int is normally used. These days, if size matters, then you should not use native data types and use types from stdint.

Prior to that you had to play games and define your own types to get known sizes for your data types. The stdint types (which is what we are talking about) were formalized in the C standard about 20 years ago. (I saw one for the 6502 back in the very early 80's but those days are long past.) So there is no C implementation where an int is 8 bits. The C standard has required the minimum size of an int be 16 bits for many decades. This makes it 8 bits for 8 bit architectures, 16 for 16, etc. If (xbee.getResponse().Just using int causes a huge number of issues when you move from one architecture to another, as the size of int is usually defined as the 'natural' size for the architecture. Serial.println(xbee.getResponse().getApiId()) ZBTxRequest zbTx = ZBTxRequest(addr64, (uint8_t *)dataArray, sizeof(dataArray)) Īnd receive the string using the following code: String incomingData I tried to send this string using the following code: power = ((360 * pulseCount) / 60) ĭataString.toCharArray(dataArray, sizeof(dataString)) I need to convert this string into a uint8_t array, because I need to send it from my xBee. I have a string that contains both numbers and character values like 'p1200' for example.

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