diff options
Diffstat (limited to 'commandline/i2c-util.c')
| -rw-r--r-- | commandline/i2c-util.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/commandline/i2c-util.c b/commandline/i2c-util.c index 753160e..3971721 100644 --- a/commandline/i2c-util.c +++ b/commandline/i2c-util.c @@ -16,6 +16,7 @@ Linux, FreeBSD, Mac OS X and other Unix operating systems. Libusb can be obtained from http://libusb.sourceforge.net/. */ +#include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <string.h> @@ -238,6 +239,56 @@ void set_scl(char value) (char *)buffer, sizeof(buffer), 5000); } +unsigned char i2c_tx_byte(unsigned char byte) +{ + signed char i; + unsigned char ack = 0; + + for (i = 7; i >= -1; i--) { + if ((i < 0) || (byte & (1 << i))) { + set_sda(1); + } + else { + set_sda(0); + } + usleep(10); + set_scl(1); + usleep(10); + if (i < 0) { + if (get_status() & (1 << BIT_SDA)) + ack = 0; + else + ack = 1; + } + set_scl(0); + usleep(10); + } + + return ack; +} + +void i2c_start() +{ + set_sda(1); + set_scl(1); + usleep(1000); + set_sda(0); + usleep(1000); + set_scl(0); + verify_sda_low(); + verify_scl_low(); +} + +void i2c_stop() +{ + set_scl(1); + usleep(100); + verify_scl_high(); + set_sda(1); + usleep(100); + verify_sda_high(); +} + void i2c_init() { usb_init(); |