mirror of
https://github.com/RT-Thread/rt-thread.git
synced 2026-09-03 22:18:33 +08:00
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
|
|
* File : ls1c_spi.h
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
|
|
*
|
|
* 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.
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2017-10-23 勤为本 first version
|
|
*/
|
|
|
|
// 硬件spi接口的头文件
|
|
|
|
#ifndef __OPENLOONGSON_SPI_H
|
|
#define __OPENLOONGSON_SPI_H
|
|
|
|
|
|
// SPI模块编号
|
|
typedef enum
|
|
{
|
|
LS1C_SPI_0 = 0,
|
|
LS1C_SPI_1,
|
|
}ls1c_spi_t;
|
|
|
|
|
|
// 片选
|
|
#define LS1C_SPI_INVALID_CS (-1)
|
|
#define LS1C_SPI_CS_0 (0)
|
|
#define LS1C_SPI_CS_1 (1)
|
|
#define LS1C_SPI_CS_2 (2)
|
|
#define LS1C_SPI_CS_3 (3)
|
|
|
|
// 时钟极性和相位
|
|
#define SPI_CPOL_1 (1)
|
|
#define SPI_CPOL_0 (0)
|
|
#define SPI_CPHA_1 (1)
|
|
#define SPI_CPHA_0 (0)
|
|
|
|
|
|
// 硬件SPI信息
|
|
typedef struct
|
|
{
|
|
ls1c_spi_t SPIx; // SPI模块编号
|
|
unsigned long max_speed_hz; // 最大通信速度，单位hz
|
|
unsigned char cs; // 片选
|
|
unsigned char cpol; // 时钟极性
|
|
unsigned char cpha; // 时钟相位
|
|
}ls1c_spi_info_t;
|
|
|
|
|
|
|
|
/*
|
|
* 初始化指定SPI模块
|
|
* @spi_info_p SPI模块信息
|
|
*/
|
|
void spi_init(ls1c_spi_info_t *spi_info_p);
|
|
|
|
|
|
/*
|
|
* 设置指定片选为指定状态
|
|
* @spi_info_p SPI模块信息
|
|
* @new_status 片选引脚的新状态，取值为0或1，即高电平或低电平
|
|
*/
|
|
void spi_set_cs(ls1c_spi_info_t *spi_info_p, int new_status);
|
|
|
|
|
|
/*
|
|
* 通过指定SPI发送接收一个字节
|
|
* 注意，在多任务的系统中，此函数需要互斥。
|
|
* 即保证在和某个从设备收发某个字节的过程中，不能被切换到其它任务同时与另外的在同一个SPI总线上的从设备通信
|
|
* 因为龙芯1c的每路SPI上可能接有不同的从设备，通信频率、模式等可能不同
|
|
* @spi_info_p SPI接口
|
|
* @tx_ch 待发送的数据
|
|
* @ret 收到的数据
|
|
*/
|
|
unsigned char spi_txrx_byte(ls1c_spi_info_t *spi_info_p, unsigned char tx_ch);
|
|
|
|
|
|
/*
|
|
* 打印指定SPI模块的所有寄存器的值
|
|
* @spi_info_p SPI模块信息
|
|
*/
|
|
void spi_print_all_regs_info(ls1c_spi_info_t *spi_info_p);
|
|
|
|
|
|
#endif
|
|
|