75 lines
2.1 KiB
C
75 lines
2.1 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 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 <https://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#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_ */
|