diff options
| -rw-r--r-- | main.cpp | 32 |
1 files changed, 7 insertions, 25 deletions
@@ -1,5 +1,5 @@ -// Sample main.cpp file. Blinks the built-in LED, sends a message out -// USART2, and turns on PWM on pin 2. +// Sample i2c master example for development i2c branch. Writes 0-63 to +// addresses 0-63 on a 24LC256 EEPROM, then reads them back. #include "wirish.h" #include "i2c.h" @@ -17,50 +17,32 @@ void setup() { pinMode(BOARD_LED_PIN, OUTPUT); - i2c_master_enable(I2C1, 0); for (i = 0; i < sizeof buf0; i++) { buf0[i + 2] = i & 0xFF; } -#if 0 + i2c_master_enable(I2C1, 0); + /* Write some bytes */ msgs[0].addr = slave_address; msgs[0].flags = 0; msgs[0].length = sizeof buf0; msgs[0].data = buf0; - i2c_master_xfer(I2C1, msgs, 1); delay(5); - return; -#endif + /* Write slave address to read */ msgs[1].addr = slave_address; msgs[1].flags = 0; - msgs[1].length = sizeof buf1; + msgs[1].length = 2; msgs[1].data = buf1; + /* Repeated start condition, then read NR_ELEMENTS bytes back */ msgs[2].addr = slave_address; msgs[2].flags = I2C_MSG_READ; msgs[2].length = sizeof buf2; msgs[2].data = buf2; i2c_master_xfer(I2C1, msgs + 1, 2); -#if 0 - for (i = 0; i < 256; i++) { - /* Read it back */ - buf1[1] = i; - msgs[1].addr = slave_address; - msgs[1].flags = 0; - msgs[1].length = 2; - msgs[1].data = buf1; - - msgs[2].addr = slave_address; - msgs[2].flags = I2C_MSG_READ; - msgs[2].length = 1; - msgs[2].data = buf2; - i2c_master_xfer(I2C1, msgs + 1, 2); - delay(10); - } -#endif } void loop() { |