Hello, all
I feel very strange about I2C communication in micaz with Tinyos 2.0.
The same example in the mail-list follows
TestC.nc file.
#include <I2C.h>
module TestC {
uses {
interface Boot;
interface Leds;
interface GeneralIO as SoundPower;
interface GeneralIO as SoundOutpt;
interface Resource;
interface I2CPacket<TI2CBasicAddr>;
}
}
implementation {
uint8_t Buffer[2];
uint8_t RBuffer[2];
void wait()
{
uint8_t i;
for(i=0;i<100;i++){
asm volatile ("nop" :: );
asm volatile ("nop" :: );
asm volatile ("nop" :: );
}
}
event void Boot.booted() {
//call SoundPower.makeOutput();
//call SoundOutpt.makeOutput();
//call SoundPower.set();
//call SoundOutpt.clr();
call Resource.request();
}
event void Resource.granted() {
Buffer[0] = 0x01;
Buffer[1] = 0x40;
if (call I2CPacket.write(I2C_START | I2C_STOP, 0xC0, 1, &Buffer
[0]) == SUCCESS) {
call Leds.led2On();
// wait();
if (call I2CPacket.read(I2C_START | I2C_STOP, 0xC0, 1, &RBuffer
[0]) == SUCCESS) call Leds.led1On();
}
}
async event void I2CPacket.readDone(error_t error, uint16_t addr,
uint8_t length, uint8_t* data) {
// call Leds.led2On();
}
async event void I2CPacket.writeDone(error_t error, uint16_t addr,
uint8_t length, uint8_t* data) {
call Leds.led0On();
}
}
TestAppC.nc file:
configuration TestAppC {}
implementation {
components TestC, MainC, MicaBusC, LedsC;
components new Atm128I2CMasterC();
TestC.Boot -> MainC;
TestC.Leds -> LedsC;
TestC.SoundPower -> MicaBusC.PW3;
TestC.SoundOutpt -> MicaBusC.PW6;
TestC.Resource -> Atm128I2CMasterC;
TestC.I2CPacket -> Atm128I2CMasterC;
}
As somebody suggested I have changed the I2C.init(FALSE) into
I2C.init(TRUE) in the Atm128I2CMasterPacketP.nc; Now when I used the
Oscilloscope to observe the signal, we can find the write operation is finished.
But the read operation can not continue even I add delay using the wait()
function.
I track the I2CPacket.read in the Atm128I2CMasterPacketP.nc;
Find when implement I2CPacket.read() the state is I2C_STARTING. Logically in
I2C.commandComplete() before signal I2CPacket.writeDone(SUCCESS, packetAddr,
packetLen, packetPtr), the state has been changed into I2C_IDLE.
I can not find which operation changes the state variable. So I am very
confused about it.
Does anybody can help me?
Thanks a lot.
Jianxin
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