peekSPI()

[Serial Peripheral Interface]

unsigned char peekSPI();

Description

Peeks at the data from the follower chip contained in the buffer.

Parameters

None.

Returns

The next byte received from the follower chip without removing it from the buffer.

Example Code

The code initializes the SPI communication with the clock pin connected to pin 13, the data in pin connected to pin 12, the data out pin connected to pin 11, the chip select pin connected to pin 10, and the polarity of the chip select line set to LOW.

Continuously checks if the chip is selected, and if it is, checks if the SPI bus buffer contains any data, and if it does, peek the data and check if it is different from 0, finally reads the data from the SPI bus buffer and save it into the EEPROM.

void setup() {
    beginEEPROM(32);                // initializes the EEPROM
    beginSPI(13, 12, 11, 10, LOW);  // initializes the SPI communication with the clock pin connected to pin 13, the data in pin connected to pin 12, the data out pin connected to pin 11, the chip select pin connected to pin 10, and the polarity of the chip select line set to LOW
}

void loop() {
    if (selectedSPI()) {                    // checks if the chip is selected
        if (availableSPI() && peekSPI()) {  // checks if the SPI bus buffer contains any data
            writeEEPROM(1, readSPI());         // reads the data from the SPI bus buffer and save it into the EEPROM
        }
    }
}

Notes and Warnings

• If the function peekSPI() is called when no data is available, the function will return 0.
• The return value of the function peekSPI() is an integer between 0 and 255 or an unsigned char.