I have 32-bit MCU. The port uses 32 digital IO functionality.STM32F469/479 Series.
I am looking for a sample code to Latch a particular bit/particular pin in PORTA
Set/RESET function particular bit In port A.
Can some one guide me on how it can be done using AND/OR/XOR operation?
Related
I am doing a university project in which i have to build a I2C which have only one slave and will have to transmit a data with 5 bits, 4 bits for the number which is in the range of 0 to 9 and 1 bit to read or write, i'm using a DE10-LITE with VHDL for this project, which has a 50 Mhz default clock, i was looking into the "ALTPLL" inside quartus prime but i can't find the option to set my clock to 100kbps, i did find in the in some forums that the "Set up PLL in LVDS mode" enables that, but for some reason quartus won't let me activate it. My SDA will be 100kbps, and the SCL 50mhz.
As the Other people have said: You don't need a PLL for that. If you already have a default clock of 50MHz then you just need to divide that by 500, using a counter, and then you have your 100kHz clock.
Anyways, you would want to start the counter only when there is a request on the bus. So user16145658 is correct: The generated clock should be the output of your state machine.
You don't need to change the clock of the FPGA, since you are using an FPGA, you only need to implement an i2c core to communicate with the i2c device.
And the i2c specification specifies the rate of i2c
Standard mode (Sm) 100 kbit/s
Fast mode (Fm) 400 kbit/s
Good morning I need to perform a 0.4 Hz pwm and with LEDC I can only reach 1 hz in esp32. Could you tell me if there is a possibility to do it?
I assume you are currently using the functions from some esp32 library. Like in the Arduino world, there is another way. You can set the right Bits so you manually create a PWM signal. Here is the Technical Reference Manual:
https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
You will find all the relevant Information in chapter 14 (LED_PWM).
I want to use hdmi monitor with cyclone V GX board, but I don't get an acknowledgement from adv7513 on i2c bus.
I think there is a problem with the address that I am sending at the beginning of the i2c transaction (I get no acknowledgement of address) I couldn't find information on whether PD/AD is low or high. Also I am not sure if i should use 7 or 8 bit address, so I would like some explanation.
I used i2c controller that i found online:
https://www.digikey.com/eewiki/pages/viewpage.action?pageId=10125324
signaltap result
I assume you haven't read the ADV7513 Programming Guide
The ADV7513 uses four I2C register maps. The SDA/SCL programming
address for the Main Register Map is 0x72 or 0x7A, based on whether
PD/AD is pulled high (10KΩ resistor to power supply = 0x7A) or pulled
low (10KΩ resistor to GND = 0x72) when power is applied to the
supplies. The user should wait 200ms for the address to be decided,
after the power supplies are high, before attempting to communicate
with the ADV7513 using I2C
I2C addresses are 7-bit or 10-bit not 8-bit. In this case it is 7-bit.
See I2C Specification. So if PD/AD is high, 7-bit address is 0x7A. In binary your 7 bits will be: 1111010. The R/W bit is the last bit of the first I2C 'address' byte but the vhd code you posted doesn't need that as part of the address, that's done separately.
addr : IN STD_LOGIC_VECTOR(6 DOWNTO 0); --address of target slave
rw : IN STD_LOGIC; --'0' is write, '1' is read
If you are still having problems, check your pull-ups, I2C SCL clock rate, ensure the master allows clock stretching. The VHDL code you posted has quite a lot of information about how to use so re-read that.
Alternatively take to question to Electrical Engineering Stack Exchange and take some oscilloscope readings of SDA/SCL.
I had designed a simple ALU, and I generated "operation codes" using a decoder. Now, I'm studying about Multiplexers, but I couldn't understand what they do in a CPU or ALU?
A really simple example: If you want to fetch a data bit from memory, a multiplexer allows you to specify an address (the input code), and the memory bit will be connected to another "pin".
So say you have 256 bits of memory, and you want to connect this to an output pin, the multiplexer has 8 bits for input codes. You proved a code say N, and and bit N is connected through the logic gates to the output of the multiplexer. This multiplexer would have a total of 256 + 8 input lines.
I'm not sure how this would be implemented in more modern CPUs but you can probably see how several bit multiplexers could be stacked together and be used to fetch a byte from memory in parallel as well, and connected to say an arithmetic register to perform computations.
Fun right?!
I need to receive signal from IR transmitter LED. I am not sure how to program the microcontroler. I am looking for some concept, how to do that. Whether I have to use A/D conversion? How to synchronize transmitter and receiver? What structure will be in coming data? Let's say that I assumed 600us for 0 (binary 0) and 1200 for 1 (binary 1) when I was programming a transmitter. What are the common steps to receive infrared transmission on PIC18F microcontroler?
It depends on the protocol you're trying to send over IR. If you can use RS232 and FM, then you just need an FM decoder (a PLL will do) and you can connect it to the PIC's serial port.