Hi all, I have build the ARM MP3/AAC Player based on the Olimex SAM7-H256 board. The player randomly swaps left and right channel at startup or even if a new track is started. I checked with an logic analyzer and an MP3 track that only contains the left channel. The DAC is working ok, but the ARM sometimes sends the data when LRCIN is low, that means right channel. Has anyone faced the same problem or has it something to do with my hardware ? Any idea is welcome. Peter
.......
dac_write_reg(AIC_REG_DIG_FORMAT, (1 << 6) | 2); // master, I2S left
aligned
// dac_write_reg(AIC_REG_DIG_ACT, 1 << 0); // activate digital interface
void dac_enable_dma()
{
// enable DMA
*AT91C_SSC_PTCR = AT91C_PDC_TXTEN;
dac_write_reg(AIC_REG_DIG_ACT, 1 << 0); // activate digital interface
}
void dac_disable_dma()
{
// disable DMA
dac_write_reg(AIC_REG_DIG_ACT, 0); // deactivate digital interface
*AT91C_SSC_PTCR = AT91C_PDC_TXTDIS;
}
have fun
Peter
faster is not always better, try this if TWI hangs:
*AT91C_TWI_CWGR = (0 << 16) | // CKDIV
(255 << 8) | // CHDIV
(255 << 0); // CLDIV
have even more fun...