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serial_decoder.cpp
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serial_decoder.cpp
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/*
***************************************************************************
*
* Author: Teunis van Beelen
*
* Copyright (C) 2016, 2017 Teunis van Beelen
*
* Email: [email protected]
*
***************************************************************************
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
***************************************************************************
*
* RS-232 protocol:
*
* settings in this example: 8N1
*
* character value in this example: 'G', 71, 0x47, 0b01000111
*
*
*
* idle start 1 1 1 0 0 0 1 0 stop idle
* bit bit
* -------------------------+ +-----+-----+-----+ +-----+ +-----+-----------------------------
* +12V | | | | | |
* | | | | | |
* | | | | | |
* | | | | | |
* -12V +-----+ +-----+-----+-----+ +-----+
*
* 0 1 2 3 4 5 6 7
*
* LSB MSB
*
*
* default (positive )line RS-232 LSB first (little endian)
*
* negative: everything inverted, used by microcontrollers, TTL/CMOS level
*
***************************************************************************
*/
void UI_Mainwindow::serial_decoder(struct device_settings *d_parms)
{
int i, j,
threshold[MAX_CHNS],
uart_tx_start,
uart_tx_data_bit,
uart_rx_start,
uart_rx_data_bit,
uart_parity_bit,
uart_parity,
spi_data_mosi_bit,
spi_data_miso_bit,
spi_mosi_bit0_pos=0,
spi_miso_bit0_pos=0,
spi_clk_new,
spi_clk_old,
spi_chars=1,
spi_timeout,
spi_timeout_cntr,
stop_bit_error;
unsigned int uart_val=0,
spi_mosi_val=0,
spi_miso_val=0;
short s_max, s_min;
double uart_sample_per_bit,
uart_tx_x_pos,
uart_rx_x_pos,
bit_per_volt;
d_parms->math_decode_uart_tx_nval = 0;
d_parms->math_decode_uart_rx_nval = 0;
d_parms->math_decode_spi_mosi_nval = 0;
d_parms->math_decode_spi_miso_nval = 0;
if(d_parms->wavebufsz < 32) return;
if(d_parms->math_decode_threshold_auto)
{
for(j=0; j<MAX_CHNS; j++)
{
if(!d_parms->chan[j].display) continue;
s_max = -32768;
s_min = 32767;
for(i=0; i<d_parms->wavebufsz; i++)
{
if(d_parms->wavebuf[j][i] > s_max) s_max = d_parms->wavebuf[j][i];
if(d_parms->wavebuf[j][i] < s_min) s_min = d_parms->wavebuf[j][i];
}
threshold[j] = (s_max + s_min) / 2;
}
}
else
{
if(d_parms->math_decode_mode == DECODE_MODE_UART)
{
if(d_parms->math_decode_uart_tx)
{
if(d_parms->modelserie == 6)
{
bit_per_volt = 32.0 / d_parms->chan[d_parms->math_decode_uart_tx - 1].scale;
threshold[d_parms->math_decode_uart_tx - 1] =
(d_parms->math_decode_threshold_uart_tx +
d_parms->chan[d_parms->math_decode_uart_tx - 1].offset)
* bit_per_volt;
}
else
{
bit_per_volt = 25.0 / d_parms->chan[d_parms->math_decode_uart_tx - 1].scale;
threshold[d_parms->math_decode_uart_tx - 1] =
(d_parms->math_decode_threshold[d_parms->math_decode_uart_tx - 1] +
d_parms->chan[d_parms->math_decode_uart_tx - 1].offset)
* bit_per_volt;
}
}
if(d_parms->math_decode_uart_rx)
{
if(d_parms->modelserie == 6)
{
bit_per_volt = 32.0 / d_parms->chan[d_parms->math_decode_uart_rx - 1].scale;
threshold[d_parms->math_decode_uart_rx - 1] =
(d_parms->math_decode_threshold_uart_rx +
d_parms->chan[d_parms->math_decode_uart_rx - 1].offset)
* bit_per_volt;
}
else
{
bit_per_volt = 25.0 / d_parms->chan[d_parms->math_decode_uart_rx - 1].scale;
threshold[d_parms->math_decode_uart_rx - 1] =
(d_parms->math_decode_threshold[d_parms->math_decode_uart_rx - 1] +
d_parms->chan[d_parms->math_decode_uart_rx - 1].offset)
* bit_per_volt;
}
}
}
else if(d_parms->math_decode_mode == DECODE_MODE_SPI)
{
if(d_parms->modelserie == 6)
{
bit_per_volt = 32.0 / d_parms->chan[d_parms->math_decode_spi_clk].scale;
threshold[d_parms->math_decode_spi_clk] =
(d_parms->math_decode_threshold[2] +
d_parms->chan[d_parms->math_decode_spi_clk].offset)
* bit_per_volt;
}
else
{
bit_per_volt = 25.0 / d_parms->chan[d_parms->math_decode_spi_clk].scale;
threshold[d_parms->math_decode_spi_clk] =
(d_parms->math_decode_threshold[d_parms->math_decode_spi_clk] +
d_parms->chan[d_parms->math_decode_spi_clk].offset)
* bit_per_volt;
}
if(d_parms->math_decode_spi_mosi)
{
if(d_parms->modelserie == 6)
{
bit_per_volt = 32.0 / d_parms->chan[d_parms->math_decode_spi_mosi - 1].scale;
threshold[d_parms->math_decode_spi_mosi - 1] =
(d_parms->math_decode_threshold[1] +
d_parms->chan[d_parms->math_decode_spi_mosi - 1].offset)
* bit_per_volt;
}
else
{
bit_per_volt = 25.0 / d_parms->chan[d_parms->math_decode_spi_mosi - 1].scale;
threshold[d_parms->math_decode_spi_mosi - 1] =
(d_parms->math_decode_threshold[d_parms->math_decode_spi_mosi - 1] +
d_parms->chan[d_parms->math_decode_spi_mosi - 1].offset)
* bit_per_volt;
}
}
if(d_parms->math_decode_spi_miso)
{
if(d_parms->modelserie == 6)
{
bit_per_volt = 32.0 / d_parms->chan[d_parms->math_decode_spi_miso - 1].scale;
threshold[d_parms->math_decode_spi_miso - 1] =
(d_parms->math_decode_threshold[0] +
d_parms->chan[d_parms->math_decode_spi_miso -1].offset)
* bit_per_volt;
}
else
{
bit_per_volt = 25.0 / d_parms->chan[d_parms->math_decode_spi_miso - 1].scale;
threshold[d_parms->math_decode_spi_miso - 1] =
(d_parms->math_decode_threshold[d_parms->math_decode_spi_miso - 1] +
d_parms->chan[d_parms->math_decode_spi_miso -1].offset)
* bit_per_volt;
}
}
if(d_parms->math_decode_spi_cs)
{
if(d_parms->modelserie == 6)
{
bit_per_volt = 32.0 / d_parms->chan[d_parms->math_decode_spi_cs - 1].scale;
threshold[d_parms->math_decode_spi_cs - 1] =
(d_parms->math_decode_threshold[3] +
d_parms->chan[d_parms->math_decode_spi_cs - 1].offset)
* bit_per_volt;
}
else
{
bit_per_volt = 25.0 / d_parms->chan[d_parms->math_decode_spi_cs - 1].scale;
threshold[d_parms->math_decode_spi_cs - 1] =
(d_parms->math_decode_threshold[d_parms->math_decode_spi_cs - 1] +
d_parms->chan[d_parms->math_decode_spi_cs - 1].offset)
* bit_per_volt;
}
}
}
}
if(d_parms->math_decode_mode == DECODE_MODE_UART)
{
d_parms->math_decode_uart_tx_nval = 0;
d_parms->math_decode_uart_rx_nval = 0;
if(d_parms->wave_mem_view_enabled)
{
uart_sample_per_bit = d_parms->samplerate / (double)d_parms->math_decode_uart_baud;
}
else
{
if(d_parms->timebasedelayenable)
{
uart_sample_per_bit = (100.0 / d_parms->timebasedelayscale) / (double)d_parms->math_decode_uart_baud;
}
else
{
uart_sample_per_bit = (100.0 / d_parms->timebasescale) / (double)d_parms->math_decode_uart_baud;
}
}
if(uart_sample_per_bit < 3) return;
uart_tx_start = 0;
uart_tx_data_bit = 0;
uart_tx_x_pos = 1;
uart_rx_start = 0;
uart_rx_data_bit = 0;
uart_rx_x_pos = 1;
// if(d_parms->modelserie == 6)
// {
// printf("chanscale: %f\n"
// "chanoffset: %f\n"
// "math_decode_threshold_uart_tx: %f\n"
// "math_decode_uart_tx: %i\n"
// "threshold: %i\n"
// "uart_sample_per_bit: %f\n"
// "wavebufsz: %i\n",
// d_parms->chanscale[d_parms->math_decode_uart_tx - 1],
// d_parms->chanoffset[d_parms->math_decode_uart_tx - 1],
// d_parms->math_decode_threshold_uart_tx,
// d_parms->math_decode_uart_tx,
// threshold[d_parms->math_decode_uart_tx - 1],
// uart_sample_per_bit,
// d_parms->wavebufsz);
// }
// else
// {
//
// printf("chanscale: %f\n"
// "chanoffset: %f\n"
// "math_decode_threshold: %f\n"
// "math_decode_uart_tx: %i\n"
// "threshold: %i\n"
// "uart_sample_per_bit: %f\n"
// "wavebufsz: %i\n",
// d_parms->chanscale[d_parms->math_decode_uart_tx - 1],
// d_parms->chanoffset[d_parms->math_decode_uart_tx - 1],
// d_parms->math_decode_threshold[d_parms->math_decode_uart_tx - 1],
// d_parms->math_decode_uart_tx,
// threshold[d_parms->math_decode_uart_tx - 1],
// uart_sample_per_bit,
// d_parms->wavebufsz);
// }
if(d_parms->math_decode_uart_tx)
{
if(d_parms->chan[d_parms->math_decode_uart_tx - 1].display) // don't try to decode if channel isn't enabled...
{
for(i=1; i<d_parms->wavebufsz; i++)
{
if(d_parms->math_decode_uart_tx_nval >= DECODE_MAX_CHARS)
{
break;
}
if(!uart_tx_start)
{
if(d_parms->math_decode_uart_pol) // positive, line level RS-232
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i-1] >= d_parms->math_decode_threshold_uart_tx)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] < d_parms->math_decode_threshold_uart_tx)
{
uart_tx_start = 1;
uart_val = 0;
uart_tx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_tx_x_pos - 1;
}
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i-1] >= threshold[d_parms->math_decode_uart_tx - 1])
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] < threshold[d_parms->math_decode_uart_tx - 1])
{
uart_tx_start = 1;
uart_val = 0;
uart_tx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_tx_x_pos - 1;
}
}
}
}
else // negative, cpu level TTL/CMOS
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i-1] < d_parms->math_decode_threshold_uart_tx)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= d_parms->math_decode_threshold_uart_tx)
{
uart_tx_start = 1;
uart_val = 0;
uart_tx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_tx_x_pos - 1;
}
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i-1] < threshold[d_parms->math_decode_uart_tx - 1])
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= threshold[d_parms->math_decode_uart_tx - 1])
{
uart_tx_start = 1;
uart_val = 0;
uart_tx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_tx_x_pos - 1;
}
}
}
}
}
else // uart_rx_start != 0
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= d_parms->math_decode_threshold_uart_tx)
{
uart_val += (1 << uart_tx_data_bit);
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= threshold[d_parms->math_decode_uart_tx - 1])
{
uart_val += (1 << uart_tx_data_bit);
}
}
if(++uart_tx_data_bit == d_parms->math_decode_uart_width)
{
if((d_parms->math_decode_uart_end) && (d_parms->math_decode_format != 4)) // big endian?
{
uart_val = reverse_bitorder_8(uart_val);
uart_val >>= (8 - uart_tx_data_bit);
}
if(!d_parms->math_decode_uart_pol) // positive, line level RS-232 or negative, cpu level TTL/CMOS?
{
uart_val = ~uart_val;
uart_val &= (0xff >> (8 - uart_tx_data_bit));
}
d_parms->math_decode_uart_tx_val[d_parms->math_decode_uart_tx_nval] = uart_val;
d_parms->math_decode_uart_tx_val_pos[d_parms->math_decode_uart_tx_nval] =
i - (uart_tx_data_bit * uart_sample_per_bit) + (0.5 * uart_sample_per_bit);
uart_tx_data_bit = 0;
uart_tx_start = 0;
d_parms->math_decode_uart_tx_err[d_parms->math_decode_uart_tx_nval] = 0;
if(d_parms->math_decode_uart_par)
{
uart_tx_x_pos += uart_sample_per_bit;
i = uart_tx_x_pos;
if(i < d_parms->wavebufsz)
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= d_parms->math_decode_threshold_uart_tx)
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 1;
}
else
{
uart_parity_bit = 0;
}
}
else
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 0;
}
else
{
uart_parity_bit = 1;
}
}
}
else
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= threshold[d_parms->math_decode_uart_tx - 1])
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 1;
}
else
{
uart_parity_bit = 0;
}
}
else
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 0;
}
else
{
uart_parity_bit = 1;
}
}
}
for(j=0, uart_parity=0; j<d_parms->math_decode_uart_width; j++)
{
uart_parity += ((uart_val >> j) & 1);
}
if(d_parms->math_decode_uart_par & 1)
{
uart_parity++;
}
if((uart_parity & 1) != uart_parity_bit)
{
d_parms->math_decode_uart_tx_err[d_parms->math_decode_uart_tx_nval] = 1;
}
}
}
uart_tx_x_pos += uart_sample_per_bit;
i = uart_tx_x_pos;
stop_bit_error = 0; // check stop bit
if(i < d_parms->wavebufsz)
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= d_parms->math_decode_threshold_uart_tx)
{
stop_bit_error = 1;
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_tx - 1][i] >= threshold[d_parms->math_decode_uart_tx - 1])
{
stop_bit_error = 1;
}
}
if(d_parms->math_decode_uart_pol)
{
if(stop_bit_error)
{
stop_bit_error = 0;
}
else
{
stop_bit_error = 1;
}
}
if(stop_bit_error)
{
d_parms->math_decode_uart_tx_err[d_parms->math_decode_uart_tx_nval] = 1;
}
}
if(d_parms->math_decode_uart_stop == 1)
{
uart_tx_x_pos += uart_sample_per_bit / 2;
}
else if(d_parms->math_decode_uart_stop == 2)
{
uart_tx_x_pos += uart_sample_per_bit;
}
i = uart_tx_x_pos - 1;
d_parms->math_decode_uart_tx_nval++;
}
else
{
uart_tx_x_pos += uart_sample_per_bit;
i = uart_tx_x_pos - 1;
}
}
}
}
}
if(d_parms->math_decode_uart_rx)
{
if(d_parms->chan[d_parms->math_decode_uart_rx - 1].display) // don't try to decode if channel isn't enabled...
{
for(i=1; i<d_parms->wavebufsz; i++)
{
if(d_parms->math_decode_uart_rx_nval >= DECODE_MAX_CHARS)
{
break;
}
if(!uart_rx_start)
{
if(d_parms->math_decode_uart_pol) // positive, line level RS-232
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i-1] >= d_parms->math_decode_threshold_uart_rx)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] < d_parms->math_decode_threshold_uart_rx)
{
uart_rx_start = 1;
uart_val = 0;
uart_rx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_rx_x_pos - 1;
}
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i-1] >= threshold[d_parms->math_decode_uart_rx - 1])
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] < threshold[d_parms->math_decode_uart_rx - 1])
{
uart_rx_start = 1;
uart_val = 0;
uart_rx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_rx_x_pos - 1;
}
}
}
}
else // negative, cpu level TTL/CMOS
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i-1] < d_parms->math_decode_threshold_uart_rx)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= d_parms->math_decode_threshold_uart_rx)
{
uart_rx_start = 1;
uart_val = 0;
uart_rx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_rx_x_pos - 1;
}
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i-1] < threshold[d_parms->math_decode_uart_rx - 1])
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= threshold[d_parms->math_decode_uart_rx - 1])
{
uart_rx_start = 1;
uart_val = 0;
uart_rx_x_pos = (uart_sample_per_bit * 1.5) + i;
i = uart_rx_x_pos - 1;
}
}
}
}
}
else // uart_rx_start != 0
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= d_parms->math_decode_threshold_uart_rx)
{
uart_val += (1 << uart_rx_data_bit);
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= threshold[d_parms->math_decode_uart_rx - 1])
{
uart_val += (1 << uart_rx_data_bit);
}
}
if(++uart_rx_data_bit == d_parms->math_decode_uart_width)
{
if((d_parms->math_decode_uart_end) && (d_parms->math_decode_format != 4)) // big endian?
{
uart_val = reverse_bitorder_8(uart_val);
uart_val >>= (8 - uart_rx_data_bit);
}
if(!d_parms->math_decode_uart_pol) // positive, line level RS-232 or negative, cpu level TTL/CMOS?
{
uart_val = ~uart_val;
uart_val &= (0xff >> (8 - uart_rx_data_bit));
}
d_parms->math_decode_uart_rx_val[d_parms->math_decode_uart_rx_nval] = uart_val;
d_parms->math_decode_uart_rx_val_pos[d_parms->math_decode_uart_rx_nval] =
i - (uart_rx_data_bit * uart_sample_per_bit) + (0.5 * uart_sample_per_bit);
uart_rx_data_bit = 0;
uart_rx_start = 0;
d_parms->math_decode_uart_rx_err[d_parms->math_decode_uart_rx_nval] = 0;
if(d_parms->math_decode_uart_par)
{
uart_rx_x_pos += uart_sample_per_bit;
i = uart_rx_x_pos;
if(i < d_parms->wavebufsz)
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= d_parms->math_decode_threshold_uart_rx)
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 1;
}
else
{
uart_parity_bit = 0;
}
}
else
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 0;
}
else
{
uart_parity_bit = 1;
}
}
}
else
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= threshold[d_parms->math_decode_uart_rx - 1])
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 1;
}
else
{
uart_parity_bit = 0;
}
}
else
{
if(d_parms->math_decode_uart_pol)
{
uart_parity_bit = 0;
}
else
{
uart_parity_bit = 1;
}
}
}
for(j=0, uart_parity=0; j<d_parms->math_decode_uart_width; j++)
{
uart_parity += ((uart_val >> j) & 1);
}
if(d_parms->math_decode_uart_par & 1)
{
uart_parity++;
}
if((uart_parity & 1) != uart_parity_bit)
{
d_parms->math_decode_uart_rx_err[d_parms->math_decode_uart_rx_nval] = 1;
}
}
}
uart_rx_x_pos += uart_sample_per_bit;
i = uart_rx_x_pos;
stop_bit_error = 0; // check stop bit
if(i < d_parms->wavebufsz)
{
if(d_parms->modelserie == 6)
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= d_parms->math_decode_threshold_uart_rx)
{
stop_bit_error = 1;
}
}
else // modelserie = 1, 2 or 4
{
if(d_parms->wavebuf[d_parms->math_decode_uart_rx - 1][i] >= threshold[d_parms->math_decode_uart_rx - 1])
{
stop_bit_error = 1;
}
}
if(d_parms->math_decode_uart_pol)
{
if(stop_bit_error)
{
stop_bit_error = 0;
}
else
{
stop_bit_error = 1;
}
}
if(stop_bit_error)
{
d_parms->math_decode_uart_rx_err[d_parms->math_decode_uart_rx_nval] = 1;
}
}
if(d_parms->math_decode_uart_stop == 1)
{
uart_rx_x_pos += uart_sample_per_bit / 2;
}
else if(d_parms->math_decode_uart_stop == 2)
{
uart_rx_x_pos += uart_sample_per_bit;
}
i = uart_rx_x_pos - 1;
d_parms->math_decode_uart_rx_nval++;
}
else
{
uart_rx_x_pos += uart_sample_per_bit;
i = uart_rx_x_pos - 1;
}
}
}
}
}
}
if(d_parms->math_decode_mode == DECODE_MODE_SPI)
{
d_parms->math_decode_spi_mosi_nval = 0;
d_parms->math_decode_spi_miso_nval = 0;
spi_data_mosi_bit = 0;
spi_data_miso_bit = 0;
spi_mosi_val = 0;
spi_miso_val = 0;
spi_timeout_cntr = 0;
if(d_parms->math_decode_spi_width > 24)
{
spi_chars = 4;
}
else if(d_parms->math_decode_spi_width > 16)
{
spi_chars = 3;
}
else if(d_parms->math_decode_spi_width > 8)
{
spi_chars = 2;
}
else
{
spi_chars = 1;
}
if(d_parms->math_decode_spi_edge) // sample at rising edge of spi clock?
{
spi_clk_old = 1;
}
else
{
spi_clk_old = 0;
}
if(!d_parms->chan[d_parms->math_decode_spi_clk].display) // without a clock we can't do much...
{
goto SPI_DECODE_OUT;
}
if(d_parms->math_decode_spi_mode) // use chip select line?
{
if(d_parms->math_decode_spi_cs) // is chip select channel selected?
{
if(!d_parms->chan[d_parms->math_decode_spi_cs].display) // is selected channel for CS enabled?
{
goto SPI_DECODE_OUT;
}
}
else
{
goto SPI_DECODE_OUT;
}
}
else // use timeout to detect start of frame
{
if(d_parms->timebasedelayenable)
{
spi_timeout = d_parms->math_decode_spi_timeout / (d_parms->timebasedelayscale / 100.0);
}
else
{
spi_timeout = d_parms->math_decode_spi_timeout / (d_parms->timebasescale / 100.0);
}
}
for(i=0; i<d_parms->wavebufsz; i++)
{
if(d_parms->math_decode_spi_mosi_nval >= DECODE_MAX_CHARS)
{
break;
}
if(d_parms->math_decode_spi_mode) // use chip select line?
{
if(d_parms->math_decode_spi_select) // use positive chip select?
{
if(d_parms->wavebuf[d_parms->math_decode_spi_cs - 1][i] < threshold[d_parms->math_decode_spi_cs - 1])
{
spi_data_mosi_bit = 0;
spi_data_miso_bit = 0;
spi_mosi_val = 0;
spi_miso_val = 0;
continue; // chip select is not active
}
}
else // use negative chip select?
{
if(d_parms->wavebuf[d_parms->math_decode_spi_cs - 1][1] >= threshold[d_parms->math_decode_spi_cs - 1])
{
spi_data_mosi_bit = 0;
spi_data_miso_bit = 0;
spi_mosi_val = 0;
spi_miso_val = 0;
continue; // chip select is not active
}
}
}
else // use timeout to detect start of frame
{
if(spi_timeout_cntr > spi_timeout)
{
spi_data_mosi_bit = 0;
spi_data_miso_bit = 0;
spi_mosi_val = 0;
spi_miso_val = 0;
}
else
{
spi_timeout_cntr++;
}
}
if(d_parms->wavebuf[d_parms->math_decode_spi_clk][i] >= threshold[d_parms->math_decode_spi_clk])
{
spi_clk_new = 1;