ret =ioctl(fd,SPI_IOC_MESSAGE(1), &tr);if(ret <1)pabort("can't send spi message");for(ret =0; ret <ARRAY_SIZE(tx); ret++) {if(!(ret %6))puts("");printf("%.2X ", rx[ret]); }puts(""); }staticvoidprint_usage(const
-1表示失败.*/int transfer(int fd, char *tx, char *rx, int len){int ret;struct spi_ioc_transfer tr = {.tx_buf = (unsigned long)tx,.rx_buf = (unsigned long)rx,.len = len,.delay_usecs = delay,.speed_hz = speed,.bits_per_word = bits,};ret = ioctl(fd, SPI_IOC_MESSAGE(...
在Linux中用spi_driver来描述一个SPI外设驱动。 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_dev...
在应用程序中可以通过ioctl来获取和配置SPI的相关属性,并实现SPI数据的发送和接收,SPI的ioctl宏定义在“/usr/include/linux/spi/spidev.h”,部分ioctl cmd如下所示: /* 读取 / 写入 SPI 模式(SPI_MODE_0..SPI_MODE_3)(限制为 8 位) */ #define SPI_IOC_RD_MODE _IOR(SPI_IOC_MAGIC, 1, __u8) /...
int fd = g_SPI_Fd; struct spi_ioc_transfer tr = { .tx_buf = (unsigned long) TxBuf, .rx_buf = (unsigned long) RxBuf, .len = len, .delay_usecs = delay, }; ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); if (ret < 1) pr_err("can't send spi message"); else { #if SP...
1、spi设备驱动的框架图 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 ...
(tr)); tr.tx_buf = (unsigned long)tx; tr.rx_buf = (unsigned long)rx; tr.len = sizeof(tx); if (ioctl(fd, SPI_IOC_MESSAGE(1), &tr) < 0) { perror("SPI transfer failed"); close(fd); return -1; } printf("Received: %02X %02X %02X\n", rx[0], rx[1], rx[2]); ...
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,};
(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed); struct spi_ioc_transfer tr = { .tx_buf = (unsigned long)tx, .rx_buf = (unsigned long)rx, .len = 3, .speed_hz = speed, .bits_per_word = bits, }; ioctl(fd, SPI_IOC_MESSAGE(1), &tr); printf("Received: %02x %02x %02x ", rx[...
{ int ret; struct spi_ioc_transfer tr = { .tx_buf = (unsigned long)tx, .rx_buf = (unsigned long)rx, .len = len, .delay_usecs = delay, .speed_hz = speed, .bits_per_word = bits, }; ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); if (ret < 1){ printf("无法发送SPI消息...