Rp2040_Hal Spi Initialisation No Read, Write, Transfer Function Cập Nhật Mới

The RP2040 is a microcontroller chip developed by Raspberry Pi that features two Cortex-M0+ cores and a wide range of peripherals, including SPI. To use the SPI interface on the RP2040, you can use the RP2040 HAL library which provides a set of functions for initializing and using the SPI peripheral.

To initialize the SPI peripheral, you can use the spi_init() function provided by the RP2040 HAL library. This function takes as input the SPI peripheral that you want to initialize (SPI0 or SPI1), the baud rate at which you want to communicate with the SPI device, the mode of communication (CPOL and CPHA), and the bit order (LSB or MSB first).

Here is an example code snippet that shows how to initialize the SPI peripheral using the RP2040 HAL library:

c
#include "pico/stdlib.h"
#include "hardware/spi.h"

int main() {
    spi_init(SPI_PORT, BAUD_RATE);
    spi_set_format(SPI_PORT, BITS_PER_WORD, SPI_MODE);
    spi_set_slave(SPI_PORT, SLAVE_SELECT);
}

In this code snippet, SPI_PORT is the SPI peripheral that you want to use (either SPI0 or SPI1), BAUD_RATE is the desired baud rate, BITS_PER_WORD is the number of bits per transfer, SPI_MODE is the mode of communication (CPOL and CPHA), and SLAVE_SELECT is the slave select pin that you want to use.

Once you have initialized the SPI peripheral, you can use the spi_write_blocking() and spi_read_blocking() functions to write and read data from the SPI device. Here is an example code snippet that shows how to use these functions:

scss
#include "pico/stdlib.h"
#include "hardware/spi.h"

int main() {
    uint8_t tx_buffer[4] = {0x01, 0x02, 0x03, 0x04};
    uint8_t rx_buffer[4];

    spi_init(SPI_PORT, BAUD_RATE);
    spi_set_format(SPI_PORT, BITS_PER_WORD, SPI_MODE);
    spi_set_slave(SPI_PORT, SLAVE_SELECT);

    spi_write_read_blocking(SPI_PORT, tx_buffer, rx_buffer, 4);
}

In this code snippet, tx_buffer contains the data that you want to send to the SPI device, and rx_buffer is the buffer that will receive the data that is read from the SPI device. The spi_write_read_blocking() function sends the data in tx_buffer to the SPI device and reads the response into rx_buffer.