I'm trying to get a bootloader to read my SD card and i have it attached to pins 50-53 but bootloader is not working correctly and i have been told to make sure the pins are correct in this bootloader file. Chip Select Pin: CS pin is connected to the Arduino board D4 digital pin. #define PIN_DO _SFR_IO_ADDR(PINB), 3 // MMC DO pin (PIN, PORT) Arduino UNO, Leonardo, Mega 2560 and compatible motherboards. #define DDR_DI _SFR_IO_ADDR(DDRB), 2 // MMC DI pin (DDR, PORT) #define DDR_CK _SFR_IO_ADDR(DDRB), 1 // MMC SCLK pin (DDR, PORT) When you want to talk to a particular SPI device you set it's SS pin low, do the SPI transfers and then set the SS pin high again when you finished talking to the SPI device. #define DDR_CS _SFR_IO_ADDR(DDRB), 0 // MMC CS pin (DDR, PORT) An SS pin does not need programming as such apart from making it an output and setting it high. #define PORT_CS _SFR_IO_ADDR(PORTB), 2 Before using this example, wire an EEPROM to the SPI pins on your Arduino as described: SPI EEPROM Pins, Arduino Pins. Technical Specifications of Arduino Mega. I will discuss about the pins of Arduino Mega in the Arduino Mega Pinout Section. #define DDR_CS _SFR_IO_ADDR(DDRB), 2 // MMC CS pin (DDR, PORT) Apart from that, the layout of Arduino Mega is very much self-explanatory. Arducam, CS, MOSI, MISO, SCK, GND, VCC, SDA. The pins of the display are VCC, GND, SDA, SCL, CS, DC, RES, MISO, SCLK, MOSI and CS. The following content is mainly for the Hardware Connection Guide of Arducam SPI Camera and Arduino Mega 2560 board. #define PORT_CS _SFR_IO_ADDR(PORTB), 0 Im trying to connect the pins of my Arduino Mega with an OLED Display SSD1351. Data pins seem to be assigned along the lines of pins 22-29 but the order is not clear regarding assignment. #define DDR_CS _SFR_IO_ADDR(DDRB), 0 // MMC CS pin (DDR, PORT) As a relative newcomer to programming and using libraries, I am repeated stumped in trying to understand the purpose of pin assignment when attaching a 3.2' LCD TFT to the Mega 2560 board. h file, on line 114 the value of CSPIN is initialized to 10, which is the Arduino Uno CS pin. Hardware dependent macros to be modified Arduino Mega 2560 has the SPI pins 50,51,52,53). MMC hardware controls and Flash controls (C)ChaN, 2010
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