/* transaction time: 2ms for 16 data bytes @6MHz, 1kB chunks */
int lgw_spi_rb(void *spi_target, uint8_t spi_mux_mode, uint8_t spi_mux_target, uint8_t address, uint8_t *data, uint16_t size) {
struct mpsse_context *mpsse = spi_target;
uint8_t command[2];
uint8_t command_size;
int size_to_do, chunk_size, offset;
int a=0, b=0, c=0, d=0;
int i;
/* check input parameters */
CHECK_NULL(spi_target);
if ((address & 0x80) != 0) {
DEBUG_MSG("WARNING: SPI address > 127\n");
}
CHECK_NULL(data);
if (size == 0) {
DEBUG_MSG("ERROR: BURST OF NULL LENGTH\n");
return LGW_SPI_ERROR;
}
/* prepare command bytes */
if (spi_mux_mode == LGW_SPI_MUX_MODE1) {
command[0] = spi_mux_target;
command[1] = READ_ACCESS | (address & 0x7F);
command_size = 2;
} else {
command[0] = READ_ACCESS | (address & 0x7F);
command_size = 1;
}
size_to_do = size;
/* start MPSSE transaction */
a = Start(mpsse);
b = FastWrite(mpsse, (char *)&command, command_size);
for (i=0; size_to_do > 0; ++i) {
chunk_size = (size_to_do < LGW_BURST_CHUNK) ? size_to_do : LGW_BURST_CHUNK;
offset = i * LGW_BURST_CHUNK;
c = FastRead(mpsse, (char *)(data + offset), chunk_size);
size_to_do -= chunk_size; /* subtract the quantity of data already transferred */
}
d = Stop(mpsse);
/* determine return code (only the last FastRead is checked) */
if ((a != MPSSE_OK) || (b != MPSSE_OK) || (c != MPSSE_OK) || (d != MPSSE_OK)) {
DEBUG_MSG("ERROR: SPI BURST READ FAILURE\n");
return LGW_SPI_ERROR;
} else {
DEBUG_MSG("Note: SPI burst read success\n");
return LGW_SPI_SUCCESS;
}
}
void ByteBuffer::FastReadMultiCore( T& v, TS& ...vs )
{
FastRead( v );
FastReadMultiCore( vs... );
}
void ByteBuffer::FastReadMultiCore( T& v )
{
FastRead( v );
}
