101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
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* File : ls1c_spi.h
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2017-10-23 勤为本 first version
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*/
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// 硬件spi接口的头文件
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#ifndef __OPENLOONGSON_SPI_H
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#define __OPENLOONGSON_SPI_H
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// SPI模块编号
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typedef enum
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{
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LS1C_SPI_0 = 0,
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LS1C_SPI_1,
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}ls1c_spi_t;
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// 片选
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#define LS1C_SPI_INVALID_CS (-1)
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#define LS1C_SPI_CS_0 (0)
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#define LS1C_SPI_CS_1 (1)
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#define LS1C_SPI_CS_2 (2)
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#define LS1C_SPI_CS_3 (3)
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// 时钟极性和相位
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#define SPI_CPOL_1 (1)
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#define SPI_CPOL_0 (0)
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#define SPI_CPHA_1 (1)
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#define SPI_CPHA_0 (0)
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// 硬件SPI信息
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typedef struct
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{
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ls1c_spi_t SPIx; // SPI模块编号
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unsigned long max_speed_hz; // 最大通信速度，单位hz
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unsigned char cs; // 片选
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unsigned char cpol; // 时钟极性
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unsigned char cpha; // 时钟相位
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}ls1c_spi_info_t;
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/*
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* 初始化指定SPI模块
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* @spi_info_p SPI模块信息
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*/
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void spi_init(ls1c_spi_info_t *spi_info_p);
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/*
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* 设置指定片选为指定状态
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* @spi_info_p SPI模块信息
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* @new_status 片选引脚的新状态，取值为0或1，即高电平或低电平
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*/
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void spi_set_cs(ls1c_spi_info_t *spi_info_p, int new_status);
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/*
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* 通过指定SPI发送接收一个字节
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* 注意，在多任务的系统中，此函数需要互斥。
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* 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
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* 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
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* @spi_info_p SPI接口
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* @tx_ch 待发送的数据
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* @ret 收到的数据
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*/
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unsigned char spi_txrx_byte(ls1c_spi_info_t *spi_info_p, unsigned char tx_ch);
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/*
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* 打印指定SPI模块的所有寄存器的值
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* @spi_info_p SPI模块信息
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*/
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void spi_print_all_regs_info(ls1c_spi_info_t *spi_info_p);
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#endif
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