Assembly university exercises with arduino

Part 6 – Using the 7-segment display To write to the 7-segment displays, look at the schematic of the Arduino module.

You must send 2 bytes through the serial input of the first byte of the 74HC595. The first byte is the 7-segment code to be displayed (active low), the second byte defines which digit will display the value sent in the first byte. (Active high). To send a byte, write a SendByte function that receives a byte and sends the 8 bits of the byte to the input of the 74HC595 (serial data in). For each bit present in this input, the Shift_Clock must be set to 1 and returned to 0. This must be repeated 8 times. Once the 2 bytes have been sent, the Latch_Clock must be set to 1 and returned to 0, so that the value sent in the first byte must be displayed in the selected digit.

Insert 2 nops between the rise and fall of each clock to avoid the pulse being too short.

Look at the following instructions that may be useful: rol , ror, brcc, brcs, cbi, sbi.

All the above code should be encapsulated as a subroutine called send_digit that receives the data (7-segment code) and the digit [1-4] in which we want it to be displayed.

Remember to preserve the temporary registers using (push / pop) Microcontrollers Part 7 – Refreshing the 7-segment display send_digit should be called four times repeatedly: loop: send_digit(DIGIT1,VALUE) delay(2msec) send_digit(DIGIT2,VALUE) delay(2msec) send_digit(DIGIT1,VALUE) delay(2msec) send_digit(DIGIT2,VALUE) delay(2msec) JMP loop Part 8 – Printing a value on the seven-segment display The idea is to implement a binary counter that increments approximately every 0.5. The counter value must be displayed on the 7-segment display. When implementing the counter, keep in mind that the display can represent numbers from 0 to 9999.

Arduino Microcontrolador Assembler

Nº del proyecto: #38720218

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