I was trying to integrate the AR1000 FM receiver break-out board with a BeagleBoard (running Android OS). I use i2c for communication. I am able to initialize the registers with the values given in the sample program and get a static sound once the registers are initialized.
When I try to tune to a particular station (say 97.3) by writing to register R2, the value gets written to R2. When I try to read R13 (Status register) after this, I can see that the channel values are still zero. The status bit becomes non zero though.
I am attaching my connection diagram, output from my program and relevant parts of the program below. Any help is appreciated.
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INITIAL STATUS AFTER INITIALIZATION (R13) - 0x0223
VALUES IN ALL THE REGISTERS AFTER INITIALIZATION -
0x00: 0xFFFF
0x01: 0x5B15
0x02: 0xF4B9
0x03: 0x8012
0x04: 0x0400
0x05: 0x28AA
0x06: 0x4400
0x07: 0x1EE7
0x08: 0x7141
0x09: 0x007D
0x0A: 0x82CE
0x0B: 0x4F55
0x0C: 0x970C
0x0D: 0xB845
0x0E: 0xFC2D
0x0F: 0x8097
0x10: 0x04A1
0x11: 0xDF6A
0x12: 0x0000
0x13: 0x0223
0x14: 0x0000
0x15: 0x0000
0x16: 0x0000
0x17: 0x0000
0x18: 0x0000
0x19: 0x0000
0x1A: 0x0000
0x1B: 0xB165
0x1C: 0x1010
VALUES IN ALL THE REGISTERS AFTER TUNING TO 97.3 -
0x00: 0xFFFF
0x01: 0x5B15
0x02: 0x031B
0x03: 0xA012
0x04: 0x0400
0x05: 0x28AA
0x06: 0x4400
0x07: 0x1EE7
0x08: 0x7141
0x09: 0x007D
0x0A: 0x82CE
0x0B: 0x4F55
0x0C: 0x970C
0x0D: 0xB845
0x0E: 0xFC2D
0x0F: 0x8097
0x10: 0x04A1
0x11: 0xDF6A
0x12: 0x0000
0x13: 0x0223
0x14: 0x0000
0x15: 0x0000
0x16: 0x0000
0x17: 0x0000
0x18: 0x0000
0x19: 0x0000
0x1A: 0x0000
0x1B: 0xB165
0x1C: 0x1010
STATUS AFTER TUNING (R13) - 0x0223
MY PROGRAM TO TUNE TO 97.3 -
void ar1000_tuneto(uint16_t freq_kHz)
{
uint16_t channel, temp, temp2,temp3;
AR1000_TUNE_OFF;
//Set Channel
channel = freq_kHz - 690;
temp = ar1000_read(2); //Read
temp &= 0xFE00; //Mask
temp |= channel;
ar1000_write(2, temp); //Write
//Enable tune bit
AR1000_TUNE_ON;
//Wait for tune to stabilize (STC flag)
temp = 0;
printf(“\n Wait till tune to stabilize”);
while(temp == 0)
{
temp = ar1000_read(ADDR_STATUS) & MASK_STC;
printf(“!”);
}
printf(“\n Tuning Over!!”);
