4181179985
This patch adds support for IO pinmuxing and GPIO on first generation Intel Galileo boards.
131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/*
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* Copyright (C) 2016, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "cy8c9540a.h"
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#include <assert.h>
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#include "i2c.h"
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#include <stdio.h>
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/* Change this to 0x21 if J2 is set to 1-2
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* (covering the pin marked with the white triangle). */
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#define I2C_ADDR 0x20
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#define REG_PORT_SEL 0x18
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#define REG_PORT_DIR 0x1C
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#define PORT_CNT 6
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/* Cache the current state of each port to obviate the need for reading before
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* writing to output ports when simply updating a single pin.
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*/
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static uint8_t out_cache[PORT_CNT];
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/*---------------------------------------------------------------------------*/
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static void
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write_reg(uint8_t reg, uint8_t data)
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{
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uint8_t pkt[] = { reg, data };
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assert(quarkX1000_i2c_polling_write(pkt, sizeof(pkt), I2C_ADDR) == 0);
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}
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/*---------------------------------------------------------------------------*/
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static uint8_t
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read_reg(uint8_t reg)
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{
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uint8_t data;
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assert(quarkX1000_i2c_polling_write(®, 1, I2C_ADDR) == 0);
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assert(quarkX1000_i2c_polling_read(&data, 1, I2C_ADDR) == 0);
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return data;
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}
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/*---------------------------------------------------------------------------*/
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void
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cy8c9540a_init(void)
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{
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uint8_t status;
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/* has to init after I2C master */
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assert(quarkX1000_i2c_is_available());
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status = read_reg(0x2E);
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if((status >> 4) != 4) {
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fprintf(stderr, "Failed to communicate with CY8C9540A. Perhaps jumper J2 "
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"is not set to 2-3? Halting.\n");
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halt();
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}
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Set the direction (in or out) for the indicated GPIO pin.
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*/
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void
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cy8c9540a_set_port_dir(cy8c9540a_bit_addr_t addr, cy8c9540a_port_dir_t dir)
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{
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uint8_t mask;
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assert(addr.port < PORT_CNT);
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write_reg(REG_PORT_SEL, addr.port);
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mask = read_reg(REG_PORT_DIR);
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mask &= ~(1 << addr.pin);
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mask |= ((uint8_t)dir) << addr.pin;
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write_reg(REG_PORT_DIR, mask);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Set the drive mode for the indicated GPIO pin.
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*/
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void
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cy8c9540a_set_drive_mode(cy8c9540a_bit_addr_t addr,
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cy8c9540a_drive_mode_t drv_mode)
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{
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assert(addr.port < PORT_CNT);
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write_reg(REG_PORT_SEL, addr.port);
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write_reg((uint8_t)drv_mode, 1 << addr.pin);
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}
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/*---------------------------------------------------------------------------*/
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bool
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cy8c9540a_read(cy8c9540a_bit_addr_t addr)
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{
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assert(addr.port < PORT_CNT);
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return ((read_reg(addr.port) >> addr.pin) & 1) == 1;
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}
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/*---------------------------------------------------------------------------*/
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void
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cy8c9540a_write(cy8c9540a_bit_addr_t addr, bool val)
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{
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assert(addr.port < PORT_CNT);
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out_cache[addr.port] &= ~(1 << addr.pin);
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out_cache[addr.port] |= ((uint8_t)val) << addr.pin;
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write_reg(8 + addr.port, out_cache[addr.port]);
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}
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/*---------------------------------------------------------------------------*/
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