blaster.txt

blaster.txt

----------------------------------------------------------------
PORTS
----------------------------------------------------------------

PORT_DSP_RESET            = PORT_BASE + 0x6,  // wo

PORT_DSP_READ_DATA        = PORT_BASE + 0xA,  // ro
// returns 0xAA after reset

PORT_DSP_WRITE_CMD_DATA   = PORT_BASE + 0xC,  // w

PORT_DSP_WRITE_BUF_STATUS = PORT_BASE + 0xC,  // r
// MSB set when not ready

PORT_DSP_READ_BUF_STATUS  = PORT_BASE + 0xE,  // ro
// clears 8bit IRQ
// returns 0xff if ready for read else 0x7f


----------------------------------------------------------------
COMMANDS
----------------------------------------------------------------

DSP_CMD_PCM8_OUT          = 0x10, data

DSP_CMD_PCM8_SC_OUT       = 0x14, lenLSB, lenMSB
// { lenMSB, lenLSB } number of bytes to output
// clears 8bit IRQ

DSP_CMD_MIDI_OUT          = 0x38, data
// output single byte to midi interface

DSP_CMD_TIME_CONST        = 0x40, tcMSB
// tc          = 65536 - (256000000 / sample_rate)
// sample_rate = 1000000 / (256 - tcMSB)

DSP_CMD_DAC_PAUSE         = 0x80, lenLSB, lenMSB

DSP_CMD_DMA_PAUSE         = 0xD0,

DSP_CMD_DAC_ON            = 0xD1,

DSP_CMD_DAC_OFF           = 0xD3,

DSP_CMD_DMA_CONTINUE      = 0xD4,

DSP_CMD_DSP_VERSION       = 0xE1, <read> verMajor, verMinor
// returns 0x01, 0x05