add cortex-v7a support
How To Run:
see TencentOS-tiny\board\ALPHA_I.MX_emmc_256ddr\README.md
TODO Next:
1. VFP support
2. fault diagnosis support
3. qemu vexpress ca9 support
4. raspberry pi support
5. SMP support
This commit is contained in:
daishengdong
315
board/ALPHA_I.MX_emmc_256ddr/bsp/i2c/bsp_i2c.c
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315
board/ALPHA_I.MX_emmc_256ddr/bsp/i2c/bsp_i2c.c
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@@ -0,0 +1,315 @@
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/***************************************************************
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Copyright © zuozhongkai Co., Ltd. 1998-2019. All rights reserved.
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文件名 : bsp_i2c.c
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作者 : 左忠凯
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版本 : V1.0
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描述 : IIC驱动文件。
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其他 : 无
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论坛 : www.openedv.com
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日志 : 初版V1.0 2019/1/15 左忠凯创建
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***************************************************************/
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#include "bsp_i2c.h"
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#include "bsp_delay.h"
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#include "printf.h"
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/*
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* @description : 初始化I2C，波特率100KHZ
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* @param - base : 要初始化的IIC设置
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* @return : 无
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*/
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void i2c_init(I2C_Type *base)
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{
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/* 1、配置I2C */
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base->I2CR &= ~(1 << 7); /* 要访问I2C的寄存器，首先需要先关闭I2C */
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/* 设置波特率为100K
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* I2C的时钟源来源于IPG_CLK_ROOT=66Mhz
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* IC2 时钟 = PERCLK_ROOT/dividison(IFDR寄存器)
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* 设置寄存器IFDR,IFDR寄存器参考IMX6UL参考手册P1260页，表29-3，
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* 根据表29-3里面的值，挑选出一个还是的分频数，比如本例程我们
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* 设置I2C的波特率为100K， 因此当分频值=66000000/100000=660.
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* 在表29-3里面查找，没有660这个值，但是有640，因此就用640,
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* 即寄存器IFDR的IC位设置为0X15
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*/
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base->IFDR = 0X15 << 0;
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/*
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* 设置寄存器I2CR，开启I2C
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* bit[7] : 1 使能I2C,I2CR寄存器其他位其作用之前，此位必须最先置1
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*/
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base->I2CR |= (1<<7);
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}
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/*
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* @description : 发送重新开始信号
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* @param - base : 要使用的IIC
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* @param - addrss : 设备地址
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* @param - direction : 方向
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* @return : 0 正常 其他值 出错
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*/
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unsigned char i2c_master_repeated_start(I2C_Type *base, unsigned char address, enum i2c_direction direction)
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{
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/* I2C忙并且工作在从模式,跳出 */
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if(base->I2SR & (1 << 5) && (((base->I2CR) & (1 << 5)) == 0))
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return 1;
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/*
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* 设置寄存器I2CR
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* bit[4]: 1 发送
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* bit[2]: 1 产生重新开始信号
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*/
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base->I2CR |= (1 << 4) | (1 << 2);
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/*
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* 设置寄存器I2DR
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* bit[7:0] : 要发送的数据，这里写入从设备地址
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* 参考资料:IMX6UL参考手册P1249
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*/
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base->I2DR = ((unsigned int)address << 1) | ((direction == kI2C_Read)? 1 : 0);
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return 0;
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}
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/*
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* @description : 发送开始信号
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* @param - base : 要使用的IIC
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* @param - addrss : 设备地址
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* @param - direction : 方向
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* @return : 0 正常 其他值 出错
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*/
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unsigned char i2c_master_start(I2C_Type *base, unsigned char address, enum i2c_direction direction)
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{
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if(base->I2SR & (1 << 5)) /* I2C忙 */
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return 1;
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/*
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* 设置寄存器I2CR
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* bit[5]: 1 主模式
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* bit[4]: 1 发送
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*/
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base->I2CR |= (1 << 5) | (1 << 4);
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/*
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* 设置寄存器I2DR
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* bit[7:0] : 要发送的数据，这里写入从设备地址
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* 参考资料:IMX6UL参考手册P1249
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*/
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base->I2DR = ((unsigned int)address << 1) | ((direction == kI2C_Read)? 1 : 0);
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return 0;
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}
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/*
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* @description : 检查并清除错误
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* @param - base : 要使用的IIC
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* @param - status : 状态
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* @return : 状态结果
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*/
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unsigned char i2c_check_and_clear_error(I2C_Type *base, unsigned int status)
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{
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/* 检查是否发生仲裁丢失错误 */
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if(status & (1<<4))
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{
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base->I2SR &= ~(1<<4); /* 清除仲裁丢失错误位 */
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base->I2CR &= ~(1 << 7); /* 先关闭I2C */
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base->I2CR |= (1 << 7); /* 重新打开I2C */
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return I2C_STATUS_ARBITRATIONLOST;
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}
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else if(status & (1 << 0)) /* 没有接收到从机的应答信号 */
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{
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return I2C_STATUS_NAK; /* 返回NAK(No acknowledge) */
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}
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return I2C_STATUS_OK;
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}
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/*
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* @description : 停止信号
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* @param - base : 要使用的IIC
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* @param : 无
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* @return : 状态结果
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*/
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unsigned char i2c_master_stop(I2C_Type *base)
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{
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unsigned short timeout = 0xffff;
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/*
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* 清除I2CR的bit[5:3]这三位
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*/
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base->I2CR &= ~((1 << 5) | (1 << 4) | (1 << 3));
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/* 等待忙结束 */
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while((base->I2SR & (1 << 5)))
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{
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timeout--;
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if(timeout == 0) /* 超时跳出 */
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return I2C_STATUS_TIMEOUT;
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}
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return I2C_STATUS_OK;
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}
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/*
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* @description : 发送数据
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* @param - base : 要使用的IIC
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* @param - buf : 要发送的数据
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* @param - size : 要发送的数据大小
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* @param - flags : 标志
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* @return : 无
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*/
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void i2c_master_write(I2C_Type *base, const unsigned char *buf, unsigned int size)
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{
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/* 等待传输完成 */
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while(!(base->I2SR & (1 << 7)));
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base->I2SR &= ~(1 << 1); /* 清除标志位 */
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base->I2CR |= 1 << 4; /* 发送数据 */
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while(size--)
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{
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base->I2DR = *buf++; /* 将buf中的数据写入到I2DR寄存器 */
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while(!(base->I2SR & (1 << 1))); /* 等待传输完成 */
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base->I2SR &= ~(1 << 1); /* 清除标志位 */
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/* 检查ACK */
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if(i2c_check_and_clear_error(base, base->I2SR))
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break;
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}
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base->I2SR &= ~(1 << 1);
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i2c_master_stop(base); /* 发送停止信号 */
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}
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/*
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* @description : 读取数据
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* @param - base : 要使用的IIC
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* @param - buf : 读取到数据
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* @param - size : 要读取的数据大小
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* @return : 无
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*/
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void i2c_master_read(I2C_Type *base, unsigned char *buf, unsigned int size)
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{
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volatile uint8_t dummy = 0;
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dummy++; /* 防止编译报错 */
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/* 等待传输完成 */
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while(!(base->I2SR & (1 << 7)));
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base->I2SR &= ~(1 << 1); /* 清除中断挂起位 */
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base->I2CR &= ~((1 << 4) | (1 << 3)); /* 接收数据 */
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/* 如果只接收一个字节数据的话发送NACK信号 */
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if(size == 1)
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base->I2CR |= (1 << 3);
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dummy = base->I2DR; /* 假读 */
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while(size--)
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{
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while(!(base->I2SR & (1 << 1))); /* 等待传输完成 */
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base->I2SR &= ~(1 << 1); /* 清除标志位 */
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if(size == 0)
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{
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i2c_master_stop(base); /* 发送停止信号 */
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}
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if(size == 1)
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{
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base->I2CR |= (1 << 3);
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}
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*buf++ = base->I2DR;
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}
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}
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/*
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* @description : I2C数据传输，包括读和写
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* @param - base: 要使用的IIC
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* @param - xfer: 传输结构体
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* @return : 传输结果,0 成功，其他值 失败;
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*/
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unsigned char i2c_master_transfer(I2C_Type *base, struct i2c_transfer *xfer)
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{
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unsigned char ret = 0;
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enum i2c_direction direction = xfer->direction;
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base->I2SR &= ~((1 << 1) | (1 << 4)); /* 清除标志位 */
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/* 等待传输完成 */
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while(!((base->I2SR >> 7) & 0X1)){};
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/* 如果是读的话，要先发送寄存器地址，所以要先将方向改为写 */
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if ((xfer->subaddressSize > 0) && (xfer->direction == kI2C_Read))
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{
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direction = kI2C_Write;
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}
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ret = i2c_master_start(base, xfer->slaveAddress, direction); /* 发送开始信号 */
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if(ret)
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{
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return ret;
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}
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while(!(base->I2SR & (1 << 1))){}; /* 等待传输完成 */
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ret = i2c_check_and_clear_error(base, base->I2SR); /* 检查是否出现传输错误 */
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if(ret)
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{
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i2c_master_stop(base); /* 发送出错，发送停止信号 */
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return ret;
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}
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/* 发送寄存器地址 */
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if(xfer->subaddressSize)
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{
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do
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{
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base->I2SR &= ~(1 << 1); /* 清除标志位 */
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xfer->subaddressSize--; /* 地址长度减一 */
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base->I2DR = ((xfer->subaddress) >> (8 * xfer->subaddressSize)); //向I2DR寄存器写入子地址
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while(!(base->I2SR & (1 << 1))); /* 等待传输完成 */
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/* 检查是否有错误发生 */
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ret = i2c_check_and_clear_error(base, base->I2SR);
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if(ret)
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{
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i2c_master_stop(base); /* 发送停止信号 */
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return ret;
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}
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} while ((xfer->subaddressSize > 0) && (ret == I2C_STATUS_OK));
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if(xfer->direction == kI2C_Read) /* 读取数据 */
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{
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base->I2SR &= ~(1 << 1); /* 清除中断挂起位 */
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i2c_master_repeated_start(base, xfer->slaveAddress, kI2C_Read); /* 发送重复开始信号和从机地址 */
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while(!(base->I2SR & (1 << 1))){};/* 等待传输完成 */
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/* 检查是否有错误发生 */
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ret = i2c_check_and_clear_error(base, base->I2SR);
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if(ret)
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{
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ret = I2C_STATUS_ADDRNAK;
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i2c_master_stop(base); /* 发送停止信号 */
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return ret;
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}
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}
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}
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/* 发送数据 */
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if ((xfer->direction == kI2C_Write) && (xfer->dataSize > 0))
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{
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i2c_master_write(base, xfer->data, xfer->dataSize);
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}
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/* 读取数据 */
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if ((xfer->direction == kI2C_Read) && (xfer->dataSize > 0))
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{
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i2c_master_read(base, xfer->data, xfer->dataSize);
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}
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return 0;
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}
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61
board/ALPHA_I.MX_emmc_256ddr/bsp/i2c/bsp_i2c.h
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61
board/ALPHA_I.MX_emmc_256ddr/bsp/i2c/bsp_i2c.h
Normal file
@@ -0,0 +1,61 @@
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#ifndef _BSP_I2C_H
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#define _BSP_I2C_H
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/***************************************************************
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Copyright © zuozhongkai Co., Ltd. 1998-2019. All rights reserved.
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文件名 : bsp_i2c.c
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作者 : 左忠凯
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版本 : V1.0
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描述 : IIC驱动文件。
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其他 : 无
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||||
论坛 : www.openedv.com
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||||
日志 : 初版V1.0 2019/1/15 左忠凯创建
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***************************************************************/
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#include "bsp.h"
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/* 相关宏定义 */
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#define I2C_STATUS_OK (0)
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#define I2C_STATUS_BUSY (1)
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#define I2C_STATUS_IDLE (2)
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#define I2C_STATUS_NAK (3)
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#define I2C_STATUS_ARBITRATIONLOST (4)
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#define I2C_STATUS_TIMEOUT (5)
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#define I2C_STATUS_ADDRNAK (6)
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/*
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* I2C方向枚举类型
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*/
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enum i2c_direction
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{
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kI2C_Write = 0x0, /* 主机向从机写数据 */
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kI2C_Read = 0x1, /* 主机从从机读数据 */
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} ;
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/*
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* 主机传输结构体
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*/
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struct i2c_transfer
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{
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unsigned char slaveAddress; /* 7位从机地址 */
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enum i2c_direction direction; /* 传输方向 */
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unsigned int subaddress; /* 寄存器地址 */
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unsigned char subaddressSize; /* 寄存器地址长度 */
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unsigned char *volatile data; /* 数据缓冲区 */
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volatile unsigned int dataSize; /* 数据缓冲区长度 */
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};
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/*
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*函数声明
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*/
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void i2c_init(I2C_Type *base);
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unsigned char i2c_master_start(I2C_Type *base, unsigned char address, enum i2c_direction direction);
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unsigned char i2c_master_repeated_start(I2C_Type *base, unsigned char address, enum i2c_direction direction);
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unsigned char i2c_check_and_clear_error(I2C_Type *base, unsigned int status);
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unsigned char i2c_master_stop(I2C_Type *base);
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void i2c_master_write(I2C_Type *base, const unsigned char *buf, unsigned int size);
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void i2c_master_read(I2C_Type *base, unsigned char *buf, unsigned int size);
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unsigned char i2c_master_transfer(I2C_Type *base, struct i2c_transfer *xfer);
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#endif
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