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分享iCore4T移植RT-Thread过程的点点滴滴——DAY 8
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iCore4T ARM+FPGA双核心板I2C总线挂有三个设备，分别为AXP152电源管理芯片，LM75A温度传感器，EEPROM存储器，在DAY 7里我给大家分享了LM75A驱动的添加过程，今天我给大家分享最后一个I2C设备EEPROM驱动的添加过程。
EEPROM是一个带电可擦可编程只读存储器，iCore4T ARM+FPGA双核心板挂有一片容量为4KBit的EEPROM可用于一些参数信息的存储。
1、修改kconfig文件，在menuconfig中添加配置EEPROM的选项。
2、添加eeprom驱动程序，并将该文件放在../bsp/stm32/libraries/HAL_Drivers，我把源码贴在下面。
- /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date Author Notes
- * 2020-02-17 zh. first version
- */
-
- #include <board.h>
- #include <drv_qspi.h>
- #include <rtdevice.h>
- #include <rthw.h>
- #include <finsh.h>
- #ifdef BSP_USING_I2C_EEPROM
- /* For eeprom i2c bus*/
- #define EEPROM_I2CBUS_NAME "i2c1"
- #define _24LC04B (0xA0 >> 1)
- static struct rt_i2c_bus_device *eeprom_i2c_bus = RT_NULL;
- static rt_err_t i2c_write_nbyte(rt_uint8_t slave_addr, rt_uint8_t cmd, rt_uint8_t *value, rt_uint32_t len)
- {
- rt_uint32_t i;
- rt_uint8_t *buffer;
- rt_size_t result;
-
- buffer = rt_malloc(len + 1);
-
- buffer[0] = cmd;
- for(i = 0;i < len;i ++)
- {
- buffer[i+1] = value[i];
- }
- result = rt_i2c_master_send(eeprom_i2c_bus, slave_addr, RT_I2C_WR, buffer, len+1);
-
- rt_free(buffer);
-
- if (result == (len+1))
- {
- return RT_EOK;
- }
- else
- {
- return -RT_ERROR;
- }
- }
- static rt_err_t i2c_read_nbyte(rt_uint8_t slave_addr, rt_uint8_t cmd, rt_uint8_t *buf, rt_uint32_t len)
- {
- rt_i2c_master_send(eeprom_i2c_bus, slave_addr, RT_I2C_WR, &cmd, 1);
-
- rt_i2c_master_recv(eeprom_i2c_bus, slave_addr, RT_I2C_RD, buf, len);
-
- return RT_EOK;
- }
- rt_uint32_t eeprom_write(rt_uint32_t addr, rt_uint8_t dat)
- {
- rt_uint8_t madd;
- if (addr > 255)
- {
- /* select block 0~255 / 256 ~ 511 */
- madd = _24LC04B | 0X01;
- addr -= 256;
- }
- else
- {
- madd = _24LC04B;
- }
-
- i2c_write_nbyte(madd, addr, &dat, 1);
- rt_thread_mdelay(10);
- return 0;
- }
- rt_uint8_t eeprom_read(rt_uint32_t addr)
- {
- rt_uint8_t madd;
- rt_uint8_t dat;
- if(addr > 255)
- {
- /* select block 0~255 / 256 ~ 511 */
- madd = _24LC04B | 0X01;
- addr -= 256;
- }
- else
- {
- madd = _24LC04B;
- }
- i2c_read_nbyte(madd, addr, &dat, 1);
- return dat;
- }
- static int eerpom_init(void)
- {
- eeprom_i2c_bus = rt_i2c_bus_device_find(EEPROM_I2CBUS_NAME);
- if(eeprom_i2c_bus == RT_NULL)
- {
- rt_kprintf("i2c_bus %s for lm75a not found!\n", eeprom_i2c_bus);
- return -RT_ERROR;
- }
- else
- {
- return RT_EOK;
- }
- }
- INIT_COMPONENT_EXPORT(eerpom_init);
- static int eeprom(int argc, char **argv)
- {
- int i;
- unsigned char write_buffer[512];
- unsigned char read_buffer[512];
- int result = RT_EOK;
- int address;
- unsigned char data;
- int errors = 0;
-
- if (argc > 1)
- {
- if(!strcmp(argv[0],"eeprom"))
- {
- if (!strcmp(argv[1], "write"))
- {
- if (argc == 4)
- {
- address = atoi(argv[2]);
- data = atoi(argv[3]);
- if(address < 512 && data <= 255)
- {
- rt_kprintf("address:%d data:%d\n",address,data);
- eeprom_write(address,data);
- }
- else
- {
- rt_kprintf("address or data is error!\n");
- }
- }
- else
- {
- rt_kprintf("Bad command. Please enter 'eeprom' for help\n");
- }
- }
- else if (!strcmp(argv[1], "read"))
- {
- if (argc == 3)
- {
- address = atoi(argv[2]);
-
- if(address < 512)
- {
- data = eeprom_read(address);
- rt_kprintf("Read eeprom address %d is %d\n",address,data);
- }
- else
- {
- rt_kprintf("address is error!\n");
- }
- }
- else
- {
- rt_kprintf("Bad command. Please enter 'eeprom' for help\n");
- }
- }
- else if (!strcmp(argv[1], "test"))
- {
- if (argc == 2)
- {
- for(i = 0;i < 512;i ++)
- {
- write_buffer[i] = i % 256;
- }
-
- for(i = 0;i < 512;i ++)
- {
- eeprom_write(i,write_buffer[i]);
- }
-
- for(i = 0;i < 512;i ++)
- {
- read_buffer[i] = eeprom_read(i);
- }
-
- for(i = 0;i < 512;i ++)
- {
- if(read_buffer[i] != write_buffer[i])
- {
- errors ++;
- rt_kprintf("eeprom error:0x%02x 0x%02x\n",write_buffer[i],read_buffer[i]);
- }
- }
- if(errors)
- {
- rt_kprintf("eeprom fail!\n");
- }
- else
- {
- rt_kprintf("eeprom ok!\n");
- }
- }
- else
- {
- rt_kprintf("Bad command. Please enter 'eeprom' for help\n");
- }
- }
- else
- {
- rt_kprintf("Bad command. Please enter 'eeprom' for help\n");
- }
- }
- else
- {
- rt_kprintf("Bad command. Please enter 'eeprom' for help\n");
- }
- }
- else
- {
- rt_kprintf("Usage: \n");
- rt_kprintf("eeprom write <address> <data> - write data to eeprom\n");
- rt_kprintf("eeprom read <address> - read data from eeprom\n");
- rt_kprintf("eeprom test - write & read test eeprom\n");
- result = -RT_ERROR;
- }
-
- return result;
- }
- MSH_CMD_EXPORT(eeprom, eeprom function);
- #endif /* BSP_USING_I2C_EEPROM */
3、打开该文件夹下的SConscript文件，添加文件路径，这样生成工程的时候可以自动将该文件加入MDK工程。
4、进入stm32h750-gingko-icore4t文件夹下，右击选择ConEmu Here，打开menuconfig，配置EEPROM。
5、使用scons命令，键入scons --target=mdk5，生成MDK5工程，编译，烧录，就可以进行EEPROM测试了。
6、打开终端，键入eeprom，我们可以看到共有三个函数分别为eeprom测试函数，eeprom写函数，eeprom读函数。
7、读写测试eeprom为整片读写测试，键入eeprom test，测试完成后弹出测试结果。
8、单字节读写操作，我们向空间地址300，写入数据111，并读出进行测试。
至此说明我们的eeprom驱动已经添加成功。
9、源代码
源代码可以稳步这里下载：
链接：https://pan.baidu.com/s/1fcLU4WaRDlgr0mNYwZj1Yg 提取码：zstq
我将在DAY9里面为大家分享W25Q64加入文件系统的过程。
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