/* * 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 #define LS1C_SPI_0 (0) #define LS1C_SPI_1 (1) // 片选 #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) // 寄存器偏移 #define LS1C_SPI_SPCR_OFFSET (0) // 控制寄存器 #define LS1C_SPI_SPSR_OFFSET (1) // 状态寄存器 #define LS1C_SPI_TxFIFO_OFFSET (2) // 发送的数据寄存器,与接收数据寄存器的偏移相同 #define LS1C_SPI_RxFIFO_OFFSET (2) // 接收的数据寄存器,与发送数据寄存器的偏移相同 #define LS1C_SPI_SPER_OFFSET (3) // 外部寄存器 #define LS1C_SPI_SFC_PARAM_OFFSET (4) // 参数控制寄存器 #define LS1C_SPI_SFC_SOFTCS_OFFSET (5) // 片选控制寄存器 #define LS1C_SPI_SFC_TIMING_OFFSET (6) // 时序控制寄存器 // 寄存器SPCR中的位域 #define LS1C_SPI_SPCR_SPIE_BIT (7) #define LS1C_SPI_SPCR_SPIE_MASK (0x01 << LS1C_SPI_SPCR_SPIE_BIT) #define LS1C_SPI_SPCR_SPE_BIT (6) #define LS1C_SPI_SPCR_SPE_MASK (0x01 << LS1C_SPI_SPCR_SPE_BIT) #define LS1C_SPI_SPCR_CPOL_BIT (3) #define LS1C_SPI_SPCR_CPOL_MASK (0x01 << LS1C_SPI_SPCR_CPOL_BIT) #define LS1C_SPI_SPCR_CPHA_BIT (2) #define LS1C_SPI_SPCR_CPHA_MASK (0x01 << LS1C_SPI_SPCR_CPHA_BIT) #define LS1C_SPI_SPCR_SPR_BIT (0) #define LS1C_SPI_SPCR_SPR_MASK (0x03 << LS1C_SPI_SPCR_SPR_BIT) // 寄存器SPSR中的位域 #define LS1C_SPI_SPSR_SPIF_BIT (7) #define LS1C_SPI_SPSR_SPIF_MASK (0x01 << LS1C_SPI_SPSR_SPIF_BIT) #define LS1C_SPI_SPSR_WCOL_BIT (6) #define LS1C_SPI_SPSR_WCOL_MASK (0x01 << LS1C_SPI_SPSR_WCOL_BIT) // 寄存器SPER中的位域 #define LS1C_SPI_SPER_SPRE_BIT (0) #define LS1C_SPI_SPER_SPRE_MASK (0x3 << LS1C_SPI_SPER_SPRE_BIT) // 寄存器SFC_SOFTCS的位域 #define LS1C_SPI_SFC_SOFTCS_CSN_BIT (4) #define LS1C_SPI_SFC_SOFTCS_CSN_MASK (0x0f << LS1C_SPI_SFC_SOFTCS_CSN_BIT) #define LS1C_SPI_SFC_SOFTCS_CSEN_BIT (0) #define LS1C_SPI_SFC_SOFTCS_CSEN_MASK (0x0f << LS1C_SPI_SFC_SOFTCS_CSEN_BIT) // 发送超时的门限值 #define LS1C_SPI_TX_TIMEOUT (20000) /* * 获取指定SPI模块的基地址 * @SPIx SPI模块的编号 */ inline void *ls1c_spi_get_base(unsigned char SPIx); /* * 设置时钟 * @spi_base 基地址 * @max_hz 最大频率,单位hz */ void ls1c_spi_set_clock(void *spi_base, unsigned long max_hz); /* * 设置通信模式(时钟极性和相位) * @spi_base 基地址 * @cpol 时钟极性 * @cpha 时钟相位 */ void ls1c_spi_set_mode(void *spi_base, unsigned char cpol, unsigned char cpha); /* * 设置指定片选为指定状态 * @spi_base 基地址 * @cs 片选 * @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 ls1c_spi_set_cs(void *spi_base, unsigned char cs, 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_base 基地址 * @tx_ch 待发送的数据 * @ret 收到的数据 */ unsigned char ls1c_spi_txrx_byte(void *spi_base, unsigned char tx_ch); /* * 打印指定SPI模块的所有寄存器的值 * @spi_base 基地址 */ void ls1c_spi_print_all_regs_info(void *spi_base); #endif