From 8d908671821bad9136be1bc5cbc3c5dbd966541c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=8B=A4=E4=B8=BA=E6=9C=AC?= <1207280597@qq.com> Date: Wed, 6 Sep 2017 12:11:46 +0800 Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E9=BE=99=E8=8A=AF1c=E7=A1=AC?= =?UTF-8?q?=E4=BB=B6I2C=E6=8E=A5=E5=8F=A3?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- bsp/ls1cdev/libraries/ls1c_gpio.c | 7 +- bsp/ls1cdev/libraries/ls1c_i2c.c | 373 ++++++++++++++++++++++++++++ bsp/ls1cdev/libraries/ls1c_i2c.h | 134 ++++++++++ bsp/ls1cdev/libraries/ls1c_public.c | 22 ++ bsp/ls1cdev/libraries/ls1c_public.h | 16 ++ bsp/ls1cdev/libraries/ls1c_regs.h | 5 + 6 files changed, 555 insertions(+), 2 deletions(-) create mode 100644 bsp/ls1cdev/libraries/ls1c_i2c.c create mode 100644 bsp/ls1cdev/libraries/ls1c_i2c.h diff --git a/bsp/ls1cdev/libraries/ls1c_gpio.c b/bsp/ls1cdev/libraries/ls1c_gpio.c index d0f0633b4e..ee073b7c4b 100644 --- a/bsp/ls1cdev/libraries/ls1c_gpio.c +++ b/bsp/ls1cdev/libraries/ls1c_gpio.c @@ -211,8 +211,8 @@ unsigned int gpio_get(unsigned int gpio) */ void gpio_set_irq_type(unsigned int gpio, gpio_irq_type_t type) { - volatile unsigned int *int_pol; // 中断极性选择寄存器 - volatile unsigned int *int_edge; // 中断边沿选择寄存器 + volatile unsigned int *int_pol = NULL; // 中断极性选择寄存器 + volatile unsigned int *int_edge = NULL; // 中断边沿选择寄存器 unsigned int port = GPIO_GET_PORT(gpio); unsigned int pin = GPIO_GET_PIN(gpio); @@ -257,6 +257,9 @@ void gpio_set_irq_type(unsigned int gpio, gpio_irq_type_t type) *int_pol &= ~(1 << pin); *int_edge &= ~(1 << pin); break; + + default: + break; } return ; diff --git a/bsp/ls1cdev/libraries/ls1c_i2c.c b/bsp/ls1cdev/libraries/ls1c_i2c.c new file mode 100644 index 0000000000..6a1622471c --- /dev/null +++ b/bsp/ls1cdev/libraries/ls1c_i2c.c @@ -0,0 +1,373 @@ +/* + * File : ls1c_i2c.c + * 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 + * 2017-09-06 勤为本 first version + */ + +// 封装硬件i2c接口 + + +#include "ls1c_public.h" +#include "ls1c_regs.h" +#include "ls1c_clock.h" +#include "ls1c_i2c.h" +#include "ls1c_delay.h" + + + +/* + * I2C各个寄存器相对基地址的偏移 + * 发送数据寄存器和接收数据寄存器的偏移是相同的 + * 命令寄存器和状态寄存器的偏移是相同的，不同的是命令寄存器只写，状态寄存器只读 + */ +#define LS1C_I2C_PRER_LOW_OFFSET (0) // 分频锁存器低字节寄存器偏移 +#define LS1C_I2C_PRER_HIGH_OFFSET (1) // 分频锁存器高字节寄存器偏移 +#define LS1C_I2C_CONTROL_OFFSET (2) // 控制寄存器偏移 +#define LS1C_I2C_DATA_OFFSET (3) // 发送数据寄存器和接收数据寄存器的偏移是相同的 +#define LS1C_I2C_CMD_OFFSET (4) // 命令寄存器偏移，只写 +#define LS1C_I2C_STATUS_OFFSET (4) // 状态寄存器偏移，只读 + + +// 控制寄存器的位域 +#define LS1C_I2C_CONTROL_EN (0x80) // i2c模块使能 +#define LS1C_I2C_CONTROL_IEN (0x40) // 中断使能 + +// 命令寄存器的位域 +#define LS1C_I2C_CMD_START (0x90) // 产生START信号 +#define LS1C_I2C_CMD_STOP (0x40) // 产生STOP信号 +#define LS1C_I2C_CMD_READ (0x20) // 产生读信号，即产生ACK信号 +#define LS1C_I2C_CMD_WRITE (0x10) // 产生写信号 +#define LS1C_I2C_CMD_READ_ACK (0x20) // 产生ACK信号，与读信号相同 +#define LS1C_I2C_CMD_READ_NACK (0x28) // 产生NACK信号 +#define LS1C_I2C_CMD_IACK (0x00) // 产生中断应答信号 + +// 状态寄存器的位域 +#define LS1C_I2C_STATUS_IF (0x01) // 中断标志位 +#define LS1C_I2C_STATUS_TIP (0x02) // 指示传输的过程。1，正在传输；0，传输完成 +#define LS1C_I2C_STATUS_ARBLOST (0x20) // I2C核失去I2C总线的控制权 +#define LS1C_I2C_STATUS_BUSY (0x40) // I2C总线忙标志 +#define LS1C_I2C_STATUS_NACK (0x80) // 应答位标志。1，没收到应答位；0，收到应答位 + + +/* + * 获取指定i2c模块的基地址 + * @I2Cx I2C模块的编号 + */ +void *i2c_get_base(ls1c_i2c_t I2Cx) +{ + void *base = NULL; + + switch (I2Cx) + { + case LS1C_I2C_0: + base = (void *)LS1C_I2C0_BASE; + break; + + case LS1C_I2C_1: + base = (void *)LS1C_I2C1_BASE; + break; + + case LS1C_I2C_2: + base = (void *)LS1C_I2C2_BASE; + break; + + default: + base = NULL; + break; + } + + return base; +} + + +/* + * 向命令寄存器写命令 + * @i2c_info_p i2c模块信息 + * @cmd 命令 + */ +void i2c_cmd(ls1c_i2c_info_t *i2c_info_p, unsigned char cmd) +{ + void *i2c_base = i2c_get_base(i2c_info_p->I2Cx); + + reg_write_8(cmd, i2c_base + LS1C_I2C_CMD_OFFSET); + + return ; +} + + +/* + * 执行START命令，发送START信号 + * @i2c_info_p i2c模块信息 + */ +void i2c_cmd_start(ls1c_i2c_info_t *i2c_info_p) +{ + i2c_cmd(i2c_info_p, LS1C_I2C_CMD_START); + return ; +} + + +/* + * 执行STOP命令，发送STOP信号 + * @i2c_info_p i2c模块信息 + */ +void i2c_cmd_stop(ls1c_i2c_info_t *i2c_info_p) +{ + i2c_cmd(i2c_info_p, LS1C_I2C_CMD_STOP); + return ; +} + + +/* + * 执行写命令 + * @i2c_info_p i2c模块信息 + */ +void i2c_cmd_write(ls1c_i2c_info_t *i2c_info_p) +{ + i2c_cmd(i2c_info_p, LS1C_I2C_CMD_WRITE); + return ; +} + + +/* + * 执行读ack命令，发送读ack信号 + * @i2c_info_p i2c模块信息 + */ +void i2c_cmd_read_ack(ls1c_i2c_info_t *i2c_info_p) +{ + i2c_cmd(i2c_info_p, LS1C_I2C_CMD_READ_ACK); + return ; +} + + +/* + * 执行读nack命令,发送读nack信号 + * @i2c_info_p i2c模块信息 + */ +void i2c_cmd_read_nack(ls1c_i2c_info_t *i2c_info_p) +{ + i2c_cmd(i2c_info_p, LS1C_I2C_CMD_READ_NACK); + return ; +} + + +/* + * 发送中断应答信号 + * @i2c_info_p i2c模块信息 + */ +void i2c_cmd_iack(ls1c_i2c_info_t *i2c_info_p) +{ + i2c_cmd(i2c_info_p, LS1C_I2C_CMD_IACK); + return ; +} + + +/* + * 获取状态寄存器的值 + * @i2c_info_p i2c模块信息 + * @ret 状态寄存器的值 + */ +unsigned char i2c_get_status(ls1c_i2c_info_t *i2c_info_p) +{ + void *i2c_base = i2c_get_base(i2c_info_p->I2Cx); + + return reg_read_8(i2c_base + LS1C_I2C_STATUS_OFFSET); +} + + +/* + * Poll the i2c status register until the specified bit is set. + * Returns 0 if timed out (100 msec). + * @i2c_info_p i2c模块信息 + * @bit 寄存器的某一位 + * @ret true or false + */ +int i2c_poll_status(ls1c_i2c_info_t *i2c_info_p, unsigned long bit) +{ + int loop_cntr = 20000; + + do { + delay_us(1); + } while ((i2c_get_status(i2c_info_p) & bit) && (0 < --loop_cntr)); + + return (0 < loop_cntr); +} + + +/* + * 初始化指定i2c模块 + * @i2c_info_p 某个i2c模块的信息 + */ +void i2c_init(ls1c_i2c_info_t *i2c_info_p) +{ + void *i2c_base = i2c_get_base(i2c_info_p->I2Cx); + unsigned long i2c_clock = i2c_info_p->clock; + unsigned char ctrl = reg_read_8(i2c_base + LS1C_I2C_CONTROL_OFFSET); + unsigned long prescale = 0; + + /* make sure the device is disabled */ + ctrl = ctrl & ~(LS1C_I2C_CONTROL_EN | LS1C_I2C_CONTROL_IEN); + reg_write_8(ctrl, i2c_base + LS1C_I2C_CONTROL_OFFSET); + + // 设置时钟 + i2c_clock = MIN(i2c_clock, LS1C_I2C_CLOCK_MAX); // 限制在最大允许范围内 + prescale = clk_get_apb_rate(); + prescale = (prescale / (5 * i2c_clock)) - 1; + reg_write_8(prescale & 0xff, i2c_base + LS1C_I2C_PRER_LOW_OFFSET); + reg_write_8(prescale >> 8, i2c_base + LS1C_I2C_PRER_HIGH_OFFSET); + + // 使能 + i2c_cmd_iack(i2c_info_p); + ctrl = ctrl | LS1C_I2C_CONTROL_EN; + reg_write_8(ctrl, i2c_base + LS1C_I2C_CONTROL_OFFSET); + + return ; +} + + +/* + * (再发送一个字节数据之后)接收从机发送的ACK信号 + * @i2c_info_p i2c模块信息 + * @ret LS1C_I2C_ACK or LS1C_I2C_NACK + */ +ls1c_i2c_ack_t i2c_receive_ack(ls1c_i2c_info_t *i2c_info_p) +{ + ls1c_i2c_ack_t ret = LS1C_I2C_NACK; + + if (LS1C_I2C_STATUS_NACK & i2c_get_status(i2c_info_p)) + { + ret = LS1C_I2C_NACK; + } + else + { + ret = LS1C_I2C_ACK; + } + + return ret; +} + + +/* + * 接收数据 + * @i2c_info_p i2c模块信息 + * @buf 数据缓存 + * @len 待接收数据的长度 + */ +ls1c_i2c_ret_t i2c_receive_data(ls1c_i2c_info_t *i2c_info_p, unsigned char *buf, int len) +{ + void *i2c_base = i2c_get_base(i2c_info_p->I2Cx); + int i = 0; + + for (i=0; iI2Cx); + unsigned char data = 0; + + // 等待i2c总线空闲 + if (!i2c_poll_status(i2c_info_p, LS1C_I2C_STATUS_BUSY)) + return LS1C_I2C_RET_TIMEOUT; + + // 填充地址到数据寄存器 + data = (slave_addr << 1) | ((LS1C_I2C_DIRECTION_READ == direction) ? 1 : 0); + reg_write_8(data , i2c_base + LS1C_I2C_DATA_OFFSET); + + // 开始发送 + i2c_cmd_start(i2c_info_p); + + // 等待，直到发送完成 + if (!i2c_poll_status(i2c_info_p, LS1C_I2C_STATUS_TIP)) + return LS1C_I2C_RET_TIMEOUT; + + return LS1C_I2C_RET_OK; +} + + +/* + * 发送数据 + * @i2c_info_p i2c模块信息 + * @data 待发送的数据 + * @len 待发送数据的长度 + */ +ls1c_i2c_ret_t i2c_send_data(ls1c_i2c_info_t *i2c_info_p, unsigned char *data, int len) +{ + void *i2c_base = i2c_get_base(i2c_info_p->I2Cx); + int i = 0; + + for (i=0; i