eng33
126 lines
3.4 KiB
C
Executable File
126 lines
3.4 KiB
C
Executable File
/*****************************************************************************
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* | File : luckfox_spi.c
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* | Author : luckfox team
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* | Function : spi
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* | Info :
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*----------------
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* | This version: V1.0
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* | Date : 2023-08-01
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* | Info : Basic version
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*
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documnetation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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#
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******************************************************************************/
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#include "luckfox_spi.h"
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uint32_t spi_max_speed = 500000;
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uint8_t spi_bits = 8;
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int luckfox_spi_init(char *dev, uint32_t mode, uint8_t bits, uint32_t speed)
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{
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int ret;
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int fd;
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spi_max_speed = speed;
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spi_bits = bits;
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fd = open(dev, O_RDWR);
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if (fd < 0)
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{
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printf("open %s error......\r\n",dev);
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return -1;
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}
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// Set SPI mode
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ret = ioctl(fd, SPI_IOC_RD_MODE, &mode);
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if (ret == -1)
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{
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printf("SPI_IOC_RD_MODE error......\n ");
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goto fd_close;
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}
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ret = ioctl(fd, SPI_IOC_WR_MODE, &mode);
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if (ret == -1)
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{
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printf("SPI_IOC_WR_MODE error......\n ");
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goto fd_close;
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}
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// Set the length of SPI communication
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ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);
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if (ret == -1)
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{
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printf("SPI_IOC_RD_BITS_PER_WORD error......\n ");
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goto fd_close;
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}
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ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
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if (ret == -1)
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{
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printf("SPI_IOC_WR_BITS_PER_WORD error......\n ");
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goto fd_close;
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}
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// Set the maximum working frequency of SPI
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ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed);
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if (ret == -1)
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{
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printf("SPI_IOC_WR_MAX_SPEED_HZ error......\n ");
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goto fd_close;
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}
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ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed);
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if (ret == -1)
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{
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printf("SPI_IOC_RD_MAX_SPEED_HZ error......\n ");
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goto fd_close;
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}
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printf("spi mode: 0x%x\n", mode);
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printf("bits per word: %d\n", bits);
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printf("max speed: %d Hz (%d KHz)\n", speed, speed / 1000);
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return fd;
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fd_close:
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close(fd);
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return -1;
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}
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int luckfox_spi_deinit(int fd)
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{
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close(fd);
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}
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int luckfox_spi_transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len, uint16_t delay)
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{
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int ret;
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struct spi_ioc_transfer tr = {
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.tx_buf = (unsigned long)tx,
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.rx_buf = (unsigned long)rx,
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.len = len,
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.delay_usecs = delay,
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.speed_hz = spi_max_speed,
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.bits_per_word = spi_bits,
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};
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ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
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if (ret == -1)
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{
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return -1;
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}
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return 0;
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}
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