339 lines
8.9 KiB
C
339 lines
8.9 KiB
C
/*
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* ports.c
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*
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* Created on: Nov 26, 2011
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* Author: Doug
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*
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* Copyright (C) 2011-2012 Doug Brown
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "ports.h"
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#include "mcp23s17.h"
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// Save some time by not changing the register
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// unless the value has changed [SPI = relatively slow]
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static uint32_t savedDataDDR = 0;
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void Ports_Init(void)
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{
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// This module depends on the MPC23S17
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MCP23S17_Init();
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savedDataDDR = 0xFFFFFFFFUL;
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Ports_SetDataDDR(0);
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}
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void Ports_SetAddressOut(uint32_t data)
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{
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// NOTE: If any of PORTA or PORTC or PORTD pins 0, 1, 4, 5, or 6 are set as
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// inputs, this function might mess with their pull-up resistors.
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// Only use it under normal operation when all the address pins are being
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// used as outputs
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PORTA = (data & 0xFF); // A0-A7
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PORTC = ((data >> 8) & 0xFF); // A8-A15
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// A16-A20 are special because they are split up...(We use PORTD pins 0, 1, 4, 5, 6)
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uint8_t tmp = (data >> 16) & 0xFF;
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tmp = (tmp & 0x03) | ((tmp & 0x1C) << 2);
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// Now, turn off the pins we have to turn off, and turn on the pins we have to turn on
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// (without affecting other pins [2, 3, and 7] that we aren't supposed to touch)
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PORTD &= (0x8C | tmp); // This should turn off all '0' bits in tmp.
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PORTD |= tmp; // This should turn on all '1' bits in tmp
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}
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void Ports_AddressOut_RMW(uint32_t data, uint32_t modifyMask)
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{
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uint32_t modifiedDataOn = data & modifyMask;
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uint32_t modifiedDataOff = data | ~modifyMask;
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// Turn on/off requested bits in the PORT register.
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PORTA |= ((modifiedDataOn >> 0) & 0xFF);
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PORTA &= ((modifiedDataOff >> 0) & 0xFF);
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PORTC |= ((modifiedDataOn >> 8) & 0xFF);
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PORTC &= ((modifiedDataOff >> 8) & 0xFF);
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// A16-A20 are special because they are split up...(We use PORTD pins 0, 1, 4, 5, 6)
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uint8_t tmp = (modifiedDataOn >> 16) & 0xFF;
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tmp = (tmp & 0x03) | ((tmp & 0x1C) << 2);
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PORTD |= tmp;
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PORTD &= (0x8C | tmp);
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}
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void Ports_SetDataOut(uint32_t data)
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{
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// NOTE: If any pins of PORTE or PORTF are set as inputs, this
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// function might mess with their pull-up resistors.
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// Only use it under normal operation when all the address pins are being
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// used as outputs
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// Set the actual outputted values
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MCP23S17_SetPins((data >> 16) & 0xFFFF); // D0-D15
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PORTE = ((data >> 8) & 0xFF); // D16-D23
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PORTF = ((data >> 0) & 0xFF); // D24-D31
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}
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void Ports_DataOut_RMW(uint32_t data, uint32_t modifyMask)
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{
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uint32_t modifiedDataOn = data & modifyMask;
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uint32_t modifiedDataOff = data | ~modifyMask;
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// Read what's in it first...
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uint16_t outputLatches = MCP23S17_GetOutputs();
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outputLatches |= (modifiedDataOn >> 16) & 0xFFFF;
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outputLatches &= (modifiedDataOff >> 16) & 0xFFFF;
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MCP23S17_SetPins(outputLatches);
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// Turn on/off requested bits in the PORT register.
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PORTE |= ((modifiedDataOn >> 8) & 0xFF);
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PORTE &= ((modifiedDataOff >> 8) & 0xFF);
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PORTF |= ((modifiedDataOn >> 0) & 0xFF);
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PORTF &= ((modifiedDataOff >> 0) & 0xFF);
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}
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void Ports_SetAddressDDR(uint32_t ddr)
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{
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DDRA = (ddr & 0xFF); // A0-A7
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DDRC = ((ddr >> 8) & 0xFF); // A8-A15
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// A16-A20 are special because they are split up...(We use PORTD pins 0, 1, 4, 5, 6)
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uint8_t tmp = (ddr >> 16) & 0xFF;
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tmp = (tmp & 0x03) | ((tmp & 0x1C) << 2);
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// Now, turn off the DDR bits we have to turn off,
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// and turn on the DDR bits we have to turn on
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// (without affecting other bits [2, 3, and 7]
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// that we aren't supposed to touch)
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DDRD &= (0x8C | tmp); // This should turn off all '0' bits in tmp.
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DDRD |= tmp; // This should turn on all '1' bits in tmp
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}
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void Ports_AddressDDR_RMW(uint32_t ddr, uint32_t modifyMask)
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{
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uint32_t modifiedDataOn = ddr & modifyMask;
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uint32_t modifiedDataOff = ddr | ~modifyMask;
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// Turn on/off requested bits in the DDR register.
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DDRA |= ((modifiedDataOn >> 0) & 0xFF);
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DDRA &= ((modifiedDataOff >> 0) & 0xFF);
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DDRC |= ((modifiedDataOn >> 8) & 0xFF);
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DDRC &= ((modifiedDataOff >> 8) & 0xFF);
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// A16-A20 are special because they are split up...(We use PORTD pins 0, 1, 4, 5, 6)
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uint8_t tmp = (modifiedDataOn >> 16) & 0xFF;
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tmp = (tmp & 0x03) | ((tmp & 0x1C) << 2);
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DDRD |= tmp;
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DDRD &= (0x8C | tmp);
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}
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void Ports_SetDataDDR(uint32_t ddr)
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{
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if (savedDataDDR != ddr)
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{
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MCP23S17_SetDDR((ddr >> 16) & 0xFFFF); // D0-D15
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DDRE = ((ddr >> 8) & 0xFF); // D16-D23
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DDRF = ((ddr >> 0) & 0xFF); // D24-D31
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savedDataDDR = ddr;
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}
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}
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void Ports_DataDDR_RMW(uint32_t ddr, uint32_t modifyMask)
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{
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uint32_t newSavedDataDDR;
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uint32_t modifiedDataOn = ddr & modifyMask;
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uint32_t modifiedDataOff = ddr | ~modifyMask;
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// If we can get away with it, don't bother reading back...
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if (((modifyMask >> 16) & 0xFFFF) == 0xFFFF)
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{
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MCP23S17_SetDDR((modifiedDataOn >> 16) & 0xFFFF);
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// Remember what the new DDR will be
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newSavedDataDDR = (modifiedDataOn & 0xFFFF0000UL);
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}
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else // Otherwise, we have to read what's in it first...(unless I decide to keep a local cached copy)
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{
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uint16_t outputLatches = MCP23S17_GetDDR();
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outputLatches |= (modifiedDataOn >> 16) & 0xFFFF;
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outputLatches &= (modifiedDataOff >> 16) & 0xFFFF;
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MCP23S17_SetDDR(outputLatches);
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// Remember what the new DDR will be
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newSavedDataDDR = ((uint32_t)outputLatches << 16);
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}
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// Turn on/off requested bits in the DDR register.
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DDRE |= ((modifiedDataOn >> 8) & 0xFF);
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DDRE &= ((modifiedDataOff >> 8) & 0xFF);
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DDRF |= ((modifiedDataOn >> 0) & 0xFF);
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DDRF &= ((modifiedDataOff >> 0) & 0xFF);
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// Remember what the new DDR will be
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newSavedDataDDR |= ((uint32_t)DDRE) << 8;
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newSavedDataDDR |= ((uint32_t)DDRF) << 0;
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// Save the new DDR
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savedDataDDR = newSavedDataDDR;
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}
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void Ports_SetCSDDR(bool ddr)
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{
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if (ddr)
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{
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DDRB |= SIMM_CS;
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}
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else
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{
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DDRB &= ~SIMM_CS;
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}
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}
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void Ports_SetOEDDR(bool ddr)
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{
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if (ddr)
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{
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DDRB |= SIMM_OE;
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}
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else
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{
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DDRB &= ~SIMM_OE;
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}
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}
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void Ports_SetWEDDR(bool ddr)
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{
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if (ddr)
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{
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DDRB |= SIMM_WE;
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}
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else
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{
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DDRB &= ~SIMM_WE;
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}
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}
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void Ports_AddressPullups_RMW(uint32_t pullups, uint32_t modifyMask)
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{
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// Pull-ups are set by writing to the data register when in input mode.
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// MAKE SURE THE PINS ARE SET AS INPUTS FIRST!
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Ports_AddressOut_RMW(pullups, modifyMask);
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}
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void Ports_DataPullups_RMW(uint32_t pullups, uint32_t modifyMask)
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{
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// Pull-ups here are a little more tricky because the MCP23S17 has
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// separate registers for pull-up enable.
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uint32_t modifiedDataOn = pullups & modifyMask;
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uint32_t modifiedDataOff = pullups | ~modifyMask;
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// If we can get away with it, don't bother reading back...
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if (((modifyMask >> 16) & 0xFFFF) == 0xFFFF)
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{
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MCP23S17_SetPullups((modifiedDataOn >> 16) & 0xFFFF);
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}
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else // Otherwise, we have to read what's in it first...(unless I decide to keep a local cached copy)
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{
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uint16_t outputLatches = MCP23S17_GetPullups();
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outputLatches |= (modifiedDataOn >> 16) & 0xFFFF;
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outputLatches &= (modifiedDataOff >> 16) & 0xFFFF;
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MCP23S17_SetPullups(outputLatches);
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}
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// Turn on/off requested bits in the PORT register for the other 16 bits.
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PORTE |= ((modifiedDataOn >> 8) & 0xFF);
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PORTE &= ((modifiedDataOff >> 8) & 0xFF);
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PORTF |= ((modifiedDataOn >> 0) & 0xFF);
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PORTF &= ((modifiedDataOff >> 0) & 0xFF);
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}
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void Ports_SetCSPullup(bool pullup)
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{
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if (pullup)
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{
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PORTB |= SIMM_CS;
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}
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else
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{
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PORTB &= ~SIMM_CS;
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}
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}
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void Ports_SetOEPullup(bool pullup)
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{
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if (pullup)
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{
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PORTB |= SIMM_OE;
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}
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else
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{
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PORTB &= ~SIMM_OE;
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}
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}
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void Ports_SetWEPullup(bool pullup)
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{
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if (pullup)
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{
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PORTB |= SIMM_WE;
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}
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else
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{
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PORTB &= ~SIMM_WE;
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}
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}
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uint32_t Ports_ReadAddress(void)
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{
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uint32_t result = PINA;
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result |= (((uint32_t)PINC) << 8);
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uint8_t tmp = (PIND & 0x03) | ((PIND & 0x70) >> 2);
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result |= (((uint32_t)tmp) << 16);
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return result;
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}
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uint32_t Ports_ReadData(void)
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{
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uint32_t result = (uint32_t)MCP23S17_ReadPins() << 16;
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// Grab the other two bytes...
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result |= (((uint32_t)PINE) << 8);
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result |= (((uint32_t)PINF) << 0);
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return result;
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}
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bool Ports_ReadCS(void)
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{
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return (PINB & SIMM_CS) != 0;
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}
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bool Ports_ReadOE(void)
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{
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return (PINB & SIMM_OE) != 0;
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}
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bool Ports_ReadWE(void)
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{
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return (PINB & SIMM_WE) != 0;
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}
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