mac-rom-simm-programmer/hal/spi.h
2023-06-25 11:38:41 -07:00

76 lines
2.2 KiB
C

/*
* spi.h
*
* Created on: Nov 14, 2020
* Author: Doug
*
* Copyright (C) 2011-2023 Doug Brown
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef HAL_SPI_H_
#define HAL_SPI_H_
#include "gpio.h"
#include "spi_private.h"
/// CPHA bit in the SPI mode parameter of SPI_InitDevice
#define SPI_CPHA (1 << 0)
/// CPOL bit in the SPI mode parameter of SPI_InitDevice
#define SPI_CPOL (1 << 1)
/// Friendly names for modes 0-3 when dealing with CPHA/CPOL in SPI_InitDevice
#define SPI_MODE_0 (0 | 0)
#define SPI_MODE_1 (0 | SPI_CPHA)
#define SPI_MODE_2 (SPI_CPOL | 0)
#define SPI_MODE_3 (SPI_CPOL | SPI_CPHA)
/// SPI controller
typedef struct SPIController
{
/// The serial clock pin
GPIOPin sckPin;
/// The master out/slave in pin
GPIOPin mosiPin;
/// The master in/slave out pin
GPIOPin misoPin;
} SPIController;
/// SPI device
typedef struct SPIDevice
{
// These two members should be filled in the struct by hand
/// The GPIO pin used for chip select
GPIOPin csPin;
/// The SPI controller this device belongs to
SPIController *controller;
// Everything below here is private
SPIDevicePrivate private;
} SPIDevice;
SPIController *SPI_Controller(uint8_t index);
void SPI_InitController(SPIController *c);
bool SPI_InitDevice(SPIDevice *spi, uint32_t maxClock, uint8_t mode);
void SPI_RequestBus(SPIDevice *spi);
void SPI_ReleaseBus(SPIDevice *spi);
void SPI_Assert(SPIDevice *spi);
void SPI_Deassert(SPIDevice *spi);
uint8_t SPI_RWByte(SPIDevice *spi, uint8_t b);
#endif /* HAL_SPI_H_ */