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make reads non blocking and set device address once #12

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make reads non blocking and set device address once #12

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2 changes: 1 addition & 1 deletion include/i2c/i2c.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ void i2c_close(int bus);
int i2c_open(const char *bus_name);

/* Initialize I2CDevice with default value */
void i2c_init_device(I2CDevice *device);
int i2c_init_device(I2CDevice *device);

/* Get i2c device description */
char *i2c_get_device_desc(const I2CDevice *device, char *buf, size_t size);
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27 changes: 12 additions & 15 deletions src/i2c.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,9 @@ int i2c_open(const char *bus_name)
return -1;
}

// make reading non blocking
fcntl(fd, F_SETFL, O_NONBLOCK);

return fd;
}

Expand All @@ -51,7 +54,7 @@ void i2c_close(int bus)
** @brief : Initialize I2CDevice with defualt value
** #device : I2CDevice struct
*/
void i2c_init_device(I2CDevice *device)
int i2c_init_device(I2CDevice *device)
{
/* 7 bit device address */
device->tenbit = 0;
Expand All @@ -64,6 +67,12 @@ void i2c_init_device(I2CDevice *device)

/* 1 byte internal(word) address */
device->iaddr_bytes = 1;

/* Set i2c slave address once */
if (i2c_select(device->bus, device->addr, device->tenbit) == -1) {
return -1;
}
return 0;
}


Expand Down Expand Up @@ -218,12 +227,6 @@ ssize_t i2c_read(const I2CDevice *device, unsigned int iaddr, void *buf, size_t
unsigned char addr[INT_ADDR_MAX_BYTES];
unsigned char delay = GET_I2C_DELAY(device->delay);

/* Set i2c slave address */
if (i2c_select(device->bus, device->addr, device->tenbit) == -1) {

return -1;
}

/* Convert i2c internal address */
memset(addr, 0, sizeof(addr));
i2c_iaddr_convert(iaddr, device->iaddr_bytes, addr);
Expand Down Expand Up @@ -266,12 +269,6 @@ ssize_t i2c_write(const I2CDevice *device, unsigned int iaddr, const void *buf,
unsigned char delay = GET_I2C_DELAY(device->delay);
unsigned char tmp_buf[PAGE_MAX_BYTES + INT_ADDR_MAX_BYTES];

/* Set i2c slave address */
if (i2c_select(device->bus, device->addr, device->tenbit) == -1) {

return -1;
}

/* Once only can write less than 4 byte */
while (remain > 0) {

Expand Down Expand Up @@ -350,8 +347,8 @@ int i2c_select(int bus, unsigned long dev_addr, unsigned long tenbit)
return -1;
}

/* Set i2c device as slave ans set it address */
if (ioctl(bus, I2C_SLAVE, dev_addr)) {
/* Set i2c device as slave and set it address */
if (ioctl(bus, I2C_SLAVE_FORCE, dev_addr)) {

perror("Set i2c device address failed");
return -1;
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