|
|
| (7 intermediate revisions by 4 users not shown) |
| Line 1: |
Line 1: |
| − | <nowiki>
| + | See [http://wiki.davincidsp.com/index.php?title=LED_usage_on_DVEVM LED usage on DaVinci EVM] article of [http://wiki.davincidsp.com/index.php?title=Main_Page official DaVinci wiki]. |
| − | /********************************************************************** | + | |
| − | * EVM_LED_BLINKING.C
| + | |
| − | *
| + | |
| − | * Simple program to blink the LEDs on the DaVinci
| + | |
| − | * EVM using the the LED port expander PCF8574A at I2C Slave Address 0x38.
| + | |
| − | * I2C Support and I2C device interface must be turned on in the kernel.
| + | |
| − | *
| + | |
| − | **************************************************************************/
| + | |
| | | | |
| − | #include <stdio.h>
| + | [[Category:DaVinci]] |
| − | #include <sys/types.h>
| + | |
| − | #include <sys/stat.h>
| + | |
| − | #include <fcntl.h>
| + | |
| − | #include <stdlib.h>
| + | |
| − | #include <unistd.h>
| + | |
| − | #include <string.h>
| + | |
| − | #include <sys/ioctl.h>
| + | |
| − | #include <errno.h>
| + | |
| − | #include <signal.h>
| + | |
| − | | + | |
| − | | + | |
| − | #define I2C_DEVICE "/dev/i2c/0"
| + | |
| − | #define I2C_DEV_ADDR 0x38
| + | |
| − | #define I2C_SLAVE 0x0703
| + | |
| − | | + | |
| − | int main()
| + | |
| − | {
| + | |
| − | int i2c_fd;
| + | |
| − | | + | |
| − | int state = 0;
| + | |
| − | unsigned char val = 0x00;
| + | |
| − | | + | |
| − | int ret;
| + | |
| − | | + | |
| − | struct timespec req =
| + | |
| − | {
| + | |
| − | .tv_sec = 0,
| + | |
| − | .tv_nsec = 100000000,
| + | |
| − | };
| + | |
| − | | + | |
| − | | + | |
| − | | + | |
| − | if((i2c_fd = open(I2C_DEVICE,O_RDWR)) < 0)
| + | |
| − | {
| + | |
| − | printf("Unable to open the i2c port!\n");
| + | |
| − | exit(1);
| + | |
| − | }
| + | |
| − | | + | |
| − | | + | |
| − | | + | |
| − | if(ioctl(i2c_fd, I2C_SLAVE, I2C_DEV_ADDR)== -1)
| + | |
| − | {
| + | |
| − | close( i2c_fd );
| + | |
| − | printf("Unable to setup the i2c port!\n");
| + | |
| − | exit(1);
| + | |
| − | }
| + | |
| − | | + | |
| − | do
| + | |
| − | {
| + | |
| − | val <<= 1;
| + | |
| − | val |= 0x01;
| + | |
| − | | + | |
| − | if(val == 0xFF)
| + | |
| − | val = 0xFE;
| + | |
| − | | + | |
| − | write( i2c_fd, &val, 1);
| + | |
| − | | + | |
| − | | + | |
| − | } while (!nanosleep (&req, NULL));
| + | |
| − | | + | |
| − | | + | |
| − | close ( i2c_fd );
| + | |
| − | printf ("End.\n");
| + | |
| − | return 0;
| + | |
| − | | + | |
| − | }
| + | |
| − | </nowiki>
| + | |
Latest revision as of 20:33, 27 October 2011
See LED usage on DaVinci EVM article of official DaVinci wiki.
