aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--main.cpp32
1 files changed, 7 insertions, 25 deletions
diff --git a/main.cpp b/main.cpp
index 0480b5d..5e3ddf3 100644
--- a/main.cpp
+++ b/main.cpp
@@ -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() {