10/27/2022 0 Comments I2c vs uart performance![]() ![]() Imposing length limits are one way to help make sure that the individual bits don't become a mush because high/low levels can't be distinguished anymore or because reflections overlap bit n-1 with bit n. ), resistance (voltage drop across the transmission line) and also capacity/inductance (U/I phase shift, coupling, time-variable impedance). ![]() You have issues like reflections (MOSFET inputs are like open line ends unless there's termination), you have interference (depending on transmission scheme, voltage level, rise/fall time. Finally, the handy library libgpiod can help you to access all GPIO pins directly, which can be helpful for debugging.Multiple reasons but it boils down to the basic properties of a transmission line: Working with the libraries follows the same principles: Determine the connected device file, configure a connection object, open the device file, then read from/write to it. Then you choose a client library and other necessary C headers. Specifically, you need to activate the I2C and SPI functions via raspi-config, which infernally loads the appropriate Kernel modules. Conclusionįor working with I2C, SPI and UART on the Raspberry Pi, not only Python, but C libraries can be used as well. ![]() If you want to work with the library, read this article for a detailed introduction. tools/gpioinfo gpiochip0 - 58 lines: line 0: "ID_SDA" unused input active-high line 1: "ID_SCL" unused input active-high line 2: "SDA1" unused input active-high line 3: "SCL1" unused input active-high line 4: "GPIO_GCLK" unused input active-high line 5: "GPIO5" unused input active-high. tools/gpiodetect gpiochip0 (58 lines) gpiochip1 (8 lines). SOURCE: */ #include #include int file int adapter_nr = 2 char filename snprintf(filename, 19, "/dev/i2c-%d", adapter_nr) file = open(filename, O_RDWR) if (file #include #include #include spi_config_t spi_config uint8_t tx_buffer uint8_t rx_buffer int main( void) write(serial_port, "Hello, world!", sizeof(msg)) char read_buf memset(
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