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Sixteen bit I2c addresses are always little endian.

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This commit is contained in:
Poul-Henning Kamp 2021-05-11 23:07:06 +00:00
parent 9db7da1f55
commit b2ae176d91
1 changed files with 5 additions and 8 deletions
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13
usr.sbin/i2c/i2c.c
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@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/endian.h>
#include <sys/ioctl.h>
#include <dev/iicbus/iic.h>
@ -570,22 +571,18 @@ i2c_rdwr_transfer(const char *dev, struct options i2c_opt, char *i2c_buf)
struct iic_msg msgs[2];
struct iic_rdwr_data xfer;
int fd, i;
union {
uint8_t buf[2];
uint8_t off8;
uint16_t off16;
} off;
uint8_t off_buf[2];
i = 0;
if (i2c_opt.width > 0) {
msgs[i].flags = IIC_M_WR | IIC_M_NOSTOP;
msgs[i].slave = i2c_opt.addr;
msgs[i].buf = off.buf;
msgs[i].buf = off_buf;
if (i2c_opt.width == 8) {
off.off8 = (uint8_t)i2c_opt.off;
off_buf[0] = i2c_opt.off;
msgs[i].len = 1;
} else {
off.off16 = (uint16_t)i2c_opt.off;
le16enc(off_buf, i2c_opt.off);
msgs[i].len = 2;
}
++i;