Avr Studio Serial Communication Library
Contents.BasicsThe Real time clock DS1307 IC basically is stand alone time clock. Well, basically we can use a micrcontroller to keep time, but the value would go off as soon as it is powered off.The RTC DS1307 is a handy solution to keep time all the way, when it is powered by a coin cell.It is uses I²C ( Inter-Integrated Circuit) protocol, referred to as I-squared-C, I-two-C, or IIC for communication with the micrcontroller.Check the here, if you are not familiar with it.For details of I2C in AVR, go through tutorial.The first thing that the MCU sends to the slave (RTC) is the device ID.
Jul 27, 2013 This article describes the setup and use of the C library for serial communication. We focus on its usage with PIC16F series of MCUs from Microchip.Here we describe how to setup a MPLAB X project with support for serial communication related functions. The library is designed for compilation and use with Microchip’s XC8 C Compiler.
The device ID for DS1307, shown below. It also tells weather we want to write to or read from the RTC.01000R/W. bit-0 is 0 than we Write to RTC. bit-0 is 1 we Read from RTC.This is defined in the code as.
#define CDs1307ReadModeU8 0xD1u // DS1307 ID #define CDs1307WriteModeU8 0xD0u // DS1307 IDThe RTC keeps the date and time arranged in it's memory as shown below:ADDRESSFUNCTIONRANGE00hSeconds00–5901hMinutes00–5902hHours01-hDay01–0704hDate01–3105hMonth01–1206hYear00–9907hControl08h to 3FhRAM00h–FFhWrite to the addresses above we can set the time, and once we set it, we can read it any time we need.The address 0x07 is a control registered as described below:76543210OUT00SQWE00RS1RS0We write 0x00 to Control register to disable SQW-Out. We do not use any other bits from it, so you need not worry.InitializeNow we can initialize the RTC with the code below.
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Hello All,Sometimes the Internal ADC is not enough. Like when you need more resolutionor high speed. The internal ADC of AVR generally has the following specifications. 15K samples per second.
10 bit resolution.If you need more than that you need an external ADC. You may also need externalADCs if you have already used the internal ones. This tutorial will guide youhow to install an external ADC with AVR MCU and write a test program to getdata from it.A very common external ADC is fromthe.It has the following configuration. 100K samples per second. (More than 6 times faster than AVRs inbuilt). 12 bit resolution (4 times more detailed).
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4 input channels (has 8 channels). SPI Bus Compatible.Basic SPI TutorialThese ADCs are SPI Bus based which is a serial bus. So the number of pins inIC is very low. Total of 4 lines are required to interface it with AVR MCU. MISO (Master In Slave Out).
MOSI (Master Out Slave In). SCK (Serial Clock). CS (Chip Select)As you know in synchronous serial communication their is a clock line (SCKin case of SPI) which synchronizes the transfer. Please read the article:-.The clock is always controlled by the MASTER. In our case the AVR MCU is theMASTER and the MCP3204 is a slave on the bus. SPI is full duplex, that meansdata can be sent and received simultaneously SPI Transfer.A SPI transfer is initiated by the MASTER pulling the CS line low.
The CS linesits at HIGH during idle state. Now master can write to the bus in 8bit (or1 byte) chunks. One most important thing to note about SPI is that for everybyte MASTER writes to SLAVE the MASTER receives one byte in return. So the onlytransaction possible is exchange of data. Their is no separate Read and Writecommands their is only one command and that is Write. So in C language you willwrite something like this datain=SPIWrite(dataout);here datain and dataout are 8 bit C variables(unsigned char).datain is the data read from the SLAVE.dataout is the data you want to send to the SLAVE.So when you just want to read data do some thing like this datain=SPIWrite(anyjunkvalue); //anyjunkvalue is a DON'T Care data byteAnd when you Only want to write data to the slave you write SPIWrite(dataout); // The Compiler just ignores the return value The MCP3204 12 bit SPI ADC Chip.The PIN out of MCP3204 is shown below.
MCP3204 SPI ADC Pin Configuration. CH0: Analog Input Channel 0. CH1: Analog Input Channel 1. CH2: Analog Input Channel 2. CH3: Analog Input Channel 3. N/C: Not Connected.
N/C: Not Connected. DGND: Digital Ground. CS: Chip Select.
Din: Connected to AVRs MOSI. Dout: Connected to AVRs MISO. CLK: Connected to AVRs SCK. Agnd: Analog Ground. Vref: Reference Voltage. (Don’t know what is Vref then See: ).
Vdd: Positive supply (5v).SPI TransactionThe SPI Packet for one ADC Conversion is made up of 3 bytes. The complete transactionis shown below.