mirror of
https://github.com/marqs85/ossc
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f502b2e46c
- Code cleanup - Some project files added - PAL linetriple added - FPGA PLL parameters optimized - Reduced jitter on low video clock sources
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
//
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// Copyright (C) 2015-2016 Markus Hiienkari <mhiienka@niksula.hut.fi>
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//
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// This file is part of Open Source Scan Converter project.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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#include <stdio.h>
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#include <unistd.h>
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#include "system.h"
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#include "altera_avalon_pio_regs.h"
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#include "i2c_opencores.h"
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#include "ths7353.h"
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inline alt_u32 ths_readreg(alt_u8 channel)
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{
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//Phase 1
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I2C_start(I2CA_BASE, THS_BASE, 0);
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I2C_write(I2CA_BASE, channel, 1);
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//Phase 2
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I2C_start(I2CA_BASE, THS_BASE, 1);
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return I2C_read(I2CA_BASE,1);
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}
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inline void ths_writereg(alt_u8 channel, alt_u8 data)
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{
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I2C_start(I2CA_BASE, THS_BASE, 0);
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I2C_write(I2CA_BASE, channel, 0);
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I2C_write(I2CA_BASE, data, 1);
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}
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int ths_init()
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{
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//Avoid random FIFO state (see datasheet p.37)
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I2C_write(I2CA_BASE, 0x00, 0);
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usleep(10);
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//Initialize all channels
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ths_writereg(THS_CH1, (THS_LPF_DEFAULT<<THS_LPF_OFFS));
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ths_writereg(THS_CH2, (THS_LPF_DEFAULT<<THS_LPF_OFFS));
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ths_writereg(THS_CH3, (THS_LPF_DEFAULT<<THS_LPF_OFFS));
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return (ths_readreg(THS_CH1) == (THS_LPF_DEFAULT<<THS_LPF_OFFS));
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}
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void ths_set_lpf(alt_u8 val)
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{
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alt_u8 status = ths_readreg(THS_CH1) & ~THS_LPF_MASK;
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status |= (val<<THS_LPF_OFFS);
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ths_writereg(THS_CH1, status);
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ths_writereg(THS_CH2, status);
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ths_writereg(THS_CH3, status);
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printf("THS LPF value set to 0x%x\n", val);
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}
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void ths_source_sel(ths_input_t input, alt_u8 lpf)
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{
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alt_u8 status = ths_readreg(THS_CH1) & ~(THS_SRC_MASK|THS_MODE_MASK);
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//alt_u8 status = 0x00;
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if (input == THS_STANDBY)
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status |= (THS_MODE_AVMUTE<<THS_MODE_OFFS);
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else
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status |= (THS_MODE_AC_BIAS | (input<<THS_SRC_OFFS));
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//status |= (lpf<<THS_LPF_OFFS);
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ths_writereg(THS_CH1, status);
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ths_writereg(THS_CH2, status);
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ths_writereg(THS_CH3, status);
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printf("THS source set to %u\n", input);
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}
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