• PSP Library Reference
• Libraries
  • sd_101.php
  • sd_104.php
  • sd_204.php
  • sd_340.php
  • sd_spc.php
  • sn_dns.php
  • sn_smtp.php
  • sn_esmtp.php
  • sn_tcp_ac.php
  • sn_tcp_ws.php
  • sn_mysql.php
• Functions
  • led_setup()
  • led_out()
  • led_in()
  • dio_out()
  • dio_in()
  • uio_ioctl()
  • uio_setup()
  • uio_out()
  • uio_in()
  • uart_setup()
  • uart_read()
  • uart_readn()
  • uart_write()
  • uart_txfree()
  • spi_setup()
  • spi_ioctl()
  • spi_read()
  • spi_write()
  • spi_write_read()
  • i2c_ioctl()
  • i2c_setup()
  • i2c_scan()
  • i2c_read()
  • i2c_write()
  • i2c_write_read()
  • st_ioctl()
  • st_free_setup()
  • st_free_get_count()
  • st_pwm_setup()
  • st_pwm_width()
  • ht_ioctl()
  • ht_pwm_setup()
  • ht_pwm_width()
  • adc_setup()
  • adc_in()
  • um_read()
  • um_write()
  • nm_read()
  • nm_write()
  • dns_setup()
  • dns_send_query()
  • dns_loop()
  • dns_lookup()
  • smtp_setup()
  • smtp_hostname()
  • smtp_account()
  • smtp_loop()
  • smtp_send()
  • smtp_start()
  • esmtp_setup()
  • esmtp_hostname()
  • esmtp_account()
  • esmtp_auth()
  • esmtp_msa()
  • esmtp_loop()
  • esmtp_start()
  • esmtp_send()
  • tcp_client()
  • tcp_server()
  • tcp_read()
  • tcp_readn()
  • tcp_write()
  • tcp_txfree()
  • tcp_state()
  • ws_setup()
  • ws_read()
  • ws_readn()
  • ws_read_line()
  • ws_write()
  • ws_txfree()
  • ws_state()
  • mysql_close()
  • mysql_connect()
  • mysql_query()
  • mysql_ping()
  • mysql_select_db()
  • mysql_error()
  • mysql_errno()
  • mysql_affected_rows()
  • mysql_num_rows()
  • mysql_result()
  • mysql_fetch_row()
  • mysql_setup()
  • spc_reset()
  • spc_sync_baud()
  • spc_scan()
  • spc_ioctl()
  • spc_request()
  • spc_request_sys()
  • spc_request_dev()
• Constants
  • LOW
  • HIGH
  • TOGGLE
  • LED_A
  • LED_B
  • LED_C
  • LED_D
  • LED_E
  • LED_F
  • LED_G
  • LED_H
  • DO_0
  • DO_1
  • DO_2
  • DO_3
  • DI_0
  • DI_1
  • DI_2
  • DI_3
  • RR_A
  • RR_AAAA
  • RR_NS
  • RR_MX

i2c_write()

Transmitting data to I2C

Description

int i2c_write(int $i2c_id, int/string $wbuf[, int $wlen = MAX_STRING_LEN])

Parameters

• $i2c_id: I2C ID
• $wbuf: variable to transmit
• $wlen: data length to transmit

Return Value

data length (byte) on success, 0 on fail

Example

<?php
include "/lib/sd_340.php";
$wbuf = "\x05\x03";
i2c_setup(0, 0x1e);                // configuring I2C
$slen = i2c_write(0, $wbuf, 2);    // transmitting data to the I2C
if($slen == 2)
  echo "$slen bytes have been sent\r\n";
?>

See also

• sd_340.php
• i2c_ioctl()
• i2c_setup()
• i2c_scan()
• i2c_read()
• i2c_write_read()