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| − | <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
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| − | *
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| − | * Simple program to blink the LEDs on the DaVinci
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| − | * EVM using the the LED port expander PCF8574A at I2C Slave Address 0x38.
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| − | * I2C Support and I2C device interface must be turned on in the kernel.
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| − | *
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| − | **************************************************************************/
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| | | | |
| − | #include <stdio.h>
| + | [[Category:DaVinci]] |
| − | #include <sys/types.h>
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| − | #include <sys/stat.h>
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| − | #include <fcntl.h>
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| − | #include <stdlib.h>
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| − | #include <unistd.h>
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| − | #include <string.h>
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| − | #include <sys/ioctl.h>
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| − | #include <errno.h>
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| − | #include <signal.h>
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| − | | |
| − | | |
| − | #define I2C_DEVICE "/dev/i2c/0"
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| − | #define I2C_DEV_ADDR 0x38
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| − | #define I2C_SLAVE 0x0703
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| − | | |
| − | int main()
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| − | {
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| − | int i2c_fd;
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| − | | |
| − | int state = 0;
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| − | unsigned char val = 0x00;
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| − | | |
| − | int ret;
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| − | | |
| − | struct timespec req =
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| − | {
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| − | .tv_sec = 0,
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| − | .tv_nsec = 100000000,
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| − | };
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| − | | |
| − | | |
| − | | |
| − | if((i2c_fd = open(I2C_DEVICE,O_RDWR)) < 0)
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| − | {
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| − | printf("Unable to open the i2c port!\n");
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| − | exit(1);
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| − | }
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| − | | |
| − | | |
| − | | |
| − | if(ioctl(i2c_fd, I2C_SLAVE, I2C_DEV_ADDR)== -1)
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| − | {
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| − | close( i2c_fd );
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| − | printf("Unable to setup the i2c port!\n");
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| − | exit(1);
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| − | }
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| − | | |
| − | do
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| − | {
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| − | val <<= 1;
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| − | val |= 0x01;
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| − | | |
| − | if(val == 0xFF)
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| − | val = 0xFE;
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| − | | |
| − | write( i2c_fd, &val, 1);
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| − | | |
| − | | |
| − | } while (!nanosleep (&req, NULL));
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| − | | |
| − | | |
| − | close ( i2c_fd );
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| − | printf ("End.\n");
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| − | return 0;
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| − | | |
| − | }
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| − | </nowiki>/
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Latest revision as of 12:33, 27 October 2011
