ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); if (ret < 1) pr_err("can't send spi message"); else { #if SPI_DEBUG int i; pr_debug("\nsend spi message Succeed"); pr_debug("\nSPI Send [Len:%d]: ", len); for (i = 0; i < len; i++) { if (i % 8 == 0) print...
printf("can't get spi mode");/** bits per word*/ret= ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);//读取字长if(ret == -1) printf("can't set bits per word"); ret= ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits);//读取spi_device的bits_per_word.if(ret == -1) printf("ca...
spidev = filp->private_data;===>>status = spidev_sync_read(spidev, count);===>> spidev_sync(spidev, &m);===>>status = spi_async(spidev->spi, message);===>> wait_for_completion(&done);===>>到了这一步是重点,在spi_async()方法中,使用以下语句将要做的事情加到workqueue中 li...
struct spi_driver { int (*probe)(struct spi_device *spi); int (*remove)(struct spi_device *spi); void (*shutdown)(struct spi_device *spi); int (*suspend)(struct spi_device *spi, pm_message_t mesg); int (*resume)(struct spi_device *spi); struct device_driver driver; }; Driv...
1. struct spi_driver { int (*probe)(struct spi_device *spi); int (*remove)(struct spi_device *spi); void (*shutdown)(struct spi_device *spi); int (*suspend)(struct spi_device *spi, pm_message_t mesg); int (*resume)(struct spi_device *spi); struct device_driver driver; }; ...
(fd,SPI_IOC_MESSAGE(1),&tr);if(ret<1){printf("can't send spi message");}else{//printf("Send spi message OK %d\n",RxBuf[0]);}return1;}/** * 功能:关闭SPI模块 */intSPI_Close(void){intfd=g_SPI_Fd;if(fd==0)/* SPI是否已经打开*/return0;close(fd);g_SPI_Fd=0;return0;...
1、spi 2、源码分析: 分析linux 4.19 spidev设备驱动代码,代码文件为spidev.c 设备驱动的初始化和退出函数: static int __init spidev_init(void) { int status; /* Claim our 256 reserved device numbers. Then register a class * that will key udev/mdev to add/remove /dev nodes. Last, register...
0 成功 * 开发⼈员：Lzy 2013－5－22 */ int SPI_Transfer(const uint8_t *TxBuf, uint8_t *RxBuf, int len){ int ret;int fd = g_SPI_Fd;struct spi_ioc_transfer tr ={ .tx_buf = (unsigned long) TxBuf,.rx_buf = (unsigned ) RxBuf,.len =len,.delay_usecs = delay,};
arg 是 spi_ioc_transfer 用法:全双工传输数据 struct spi_ioc_transfer tr = { .tx_buf = (unsigned long)tx, .rx_buf = (unsigned long)rx, .len = ARRAY_SIZE(tx), .delay_usecs = delay, .speed_hz = speed, .bits_per_word = bits, }; ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr)...
spi_fd = open(SPI_DEVICE, O_RDWR); // 打开SPI设备文件 if (spi_fd == -1) { perror(“Error opening SPI device”); return 1; } // 设置SPI模式和时钟速度 if (ioctl(spi_fd, SPI_IOC_WR_MODE, &SPI_MODE) == -1) { perror(“Error setting SPI mode”); ...