Embedded and Industrial Computer Systems Term Project

Extract

[...] It should have the following features: Initialization of the CAN controller. Use the loop-back mode for now. Send a message with a given ID and data (for instance, by passing a struct containing the ID, length and data to a send function) Receive a message. #include < avr > #include #include < avr > #include "CAN_Driver.h" #include "MCP2515_Driver.h" #include bool buffer_is_free(); void receive_interrupt() When CAN receive { DDRD « PD2); GICR = « INT0); MCUCR = « ISC01); MCUCR « ISC00); } void CAN_init(uint8_t mode) { MCP2515_init(mode); //MCP2515_bit_modify(MCP_CANCTRL, MODE_MASK, mode); set mode MCP2515_write(MCP_RXB0CTRL, MCP_RXM1 MCP_RXM0); MCP2515_bit_modify(MCP_CANINTE, MCP_RX1IF MCP_RX0IF, 0xFF); interrupt for reception in RX0 AND RX1 receive_interrupt(); MCP2515_bit_modify(MCP_CANCTRL, MODE_MASK, mode); set mode } void CAN_Send(CAN_MESSAGE* message) { MCP2515_write(MCP_TXB0SIDH, (message->id) » MCP2515_write(MCP_TXB0SIDL, (message->id & 0x07) « MCP2515_write(MCP_TXB0DLC, message->data_length); while( buffer_is_free()) { } for (uint8_t i = i data_length; { MCP2515_write(MCP_TXB0D0 + message->data[i]); } MCP2515_request_to_send(); } bool buffer_is_free(){ return (MCP2515_read((MCP_TXB0CTRL) & MCP_TXREQ)) } void CAN_Receive(CAN_MESSAGE* message) { if (MCP2515_read(MCP_CANINTF) & MCP_RX0IF) { uint8_t id_low_0 = MCP2515_read(MCP_RXB0SIDL); uint8_t id_high_0 = MCP2515_read(MCP_RXB0SIDH); message->id = (id_low_0 » + (id_high_0 « message->data_length = MCP2515_read(MCP_RXB0DLC); for (uint8_t i = i data_length; { message->data[i] = MCP2515_read(MCP_RXB0D0 + } } else if (MCP2515_read(MCP_CANINTF) & MCP_RX1IF) { uint8_t id_low_1 = MCP2515_read(MCP_RXB1SIDL); uint8_t id_high_1 = MCP2515_read(MCP_RXB1SIDH); message->id = (id_low_1 » + (id_high_1 « message->data_length = MCP2515_read(MCP_RXB1DLC); for (int m = m data_length; { message->data[m] = MCP2515_read(MCP_RXB1D0 + } } } Driver for CAN Communication using MCP2515 Initialization of the CAN Controller: To initialize the MCP2515 CAN controller, set the CANCTRL.REQOP bits to '100' to enter the Configuration mode. [...]

[...] Check IR Level Against Threshold: The function then checks the `ir_level` against a predefined threshold `IR_seuil` (which seems to be a threshold similar to `IR_TRESHOLD` defined in the previous code snippet, but with a different name). This threshold likely represents a specific IR intensity level that triggers certain actions. Actions Based on IR Level: Below Threshold: if (ir_level [...]

[...] Iterates over the bitmap representation of the character in `font8`. Each character is represented by an array of 8 bytes in `font8`, where each byte represents a line of 8 pixels on the screen. Uses `write_d` to write each line of the bitmap representation to the OLED screen. A command function that controls the OLED configuration registers OLED_reset(); void clear_oled() { for (int line = line num_lines; line++) { set_position(line, for (int column = column num_columns; column++) { write_d(0); } } } This function clears the content of the OLED screen, turning it completely black. [...]

[...] C1 and C2 should always be equal for both crystals and resonators. The optimal value of the capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for use with crystals are given in Table 7. For ceramic resonators, the capacitor values given by the manufacturer should be used. Connect the JTAG interface for Atmel-ICE to the breadboard. See the Atmel-ICE and ATmega162 manuals for which pins to connect. [...]

[...] Read the datasheet to find out how data is to be read. Note that timing is important. Power on the USB multifunction card and check that the positions of sliders and buttons are shown on the OLED. Make sure the jumper across "EXTSEL" is disconnected. Connect it again afterwards. "EXTSEL" switches between internal and external control of the OLED. Connect the joystick to the ADC, and verify that the ADC can read the joystick position. Use an oscilloscope to find the pins that output the touch signals. [...]