I2C接口的eerom直接通过烧写MCU启动读写错误，debug模块没问题

发布于 2021-01-18 08:56:21 浏览：1199 订阅该版

2 个回答

杰瑞鼠 2021-01-18

2024龙行天下

iamyhw 2021-01-21

这家伙很懒，什么也没写！

杰瑞鼠 2021-01-21

2024龙行天下

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iamyhw 2021-01-21

这家伙很懒，什么也没写！

杰瑞鼠 2021-01-21

2024龙行天下

iamyhw 2021-01-23

这家伙很懒，什么也没写！

iamyhw 2021-01-23

这家伙很懒，什么也没写！

现在上班了,我贴出我的FRAM代码,你看看我是怎么处理的,不需要改驱动代码,如果你熟悉驱动的意图的话.
```c
#define EEPROM_I2CBUS_NAME  "i2c1" //连接到EEPROM的I2C总线的设备名称
#define EEPROM_ADDR         0x50   //EEPROM从设备地址

static struct rt_i2c_bus_device *i2c_bus_eeprom = RT_NULL;

#if 0
rt_err_t eeprom_write(rt_uint16_t addr, void *buf, rt_uint32_t len)
{
    rt_size_t size;
    rt_uint8_t addr_buf[2];

addr_buf[0] = (addr>>8)&0xFF;
    addr_buf[1] = addr & 0xFF;

size = rt_i2c_master_send(i2c_bus_eeprom, EEPROM_ADDR, RT_I2C_WR|RT_I2C_NO_END, addr_buf, 2);
    if (size != 2) {
        rt_kprintf("WR1.EEPROM write failed, size=%d\n", size);
        return -RT_ERROR;
    }
    size = rt_i2c_master_send(i2c_bus_eeprom, EEPROM_ADDR, RT_I2C_WR|RT_I2C_NO_START, buf, len);
    if (size != len) {
        rt_kprintf("WR2.EEPROM write failed, size=%d\n", size);
        return -RT_ERROR;
    }

return RT_EOK;
}
#else
#define EE_PAGESIZE 64
rt_err_t eeprom_write(rt_uint16_t addr, void *buf, rt_uint32_t len)
{
    rt_size_t size;
    rt_uint8_t addr_buf[2];
    rt_uint32_t wrlen;

do {
        wrlen = EE_PAGESIZE - addr % EE_PAGESIZE;
        if (wrlen > len) wrlen = len;
        //rt_kprintf("addr=%d, wrlen=%d\n", addr, wrlen); //DEBUG

addr_buf[0] = (addr>>8)&0xFF;
        addr_buf[1] = addr & 0xFF;

size = rt_i2c_master_send(i2c_bus_eeprom, EEPROM_ADDR, RT_I2C_WR|RT_I2C_NO_END, addr_buf, 2);
        if (size != 2) {
            rt_kprintf("WR1.EEPROM write failed, size is:%d\n", size);
            return -RT_ERROR;
        }
        size = rt_i2c_master_send(i2c_bus_eeprom, EEPROM_ADDR, RT_I2C_WR|RT_I2C_NO_START, buf, wrlen);
        if (size != wrlen) {
            rt_kprintf("WR2.EEPROM write failed, addr:%02X%02X, size=%d\n", addr_buf[0], addr_buf[1], size);
            return -RT_ERROR;
        }
        buf  += wrlen; //change to next page data align to EE_PAGESIZE bytes.
        addr += wrlen; //change to next page address.
        len  -= wrlen;
    } while (len);

return RT_EOK;
}
#endif

rt_err_t eeprom_read(rt_uint16_t addr, void *buf, rt_uint32_t len)
{
    rt_size_t size;
    rt_uint8_t addr_buf[2];

addr_buf[0] = (addr>>8)&0xFF;
    addr_buf[1] = addr & 0xFF;

size = rt_i2c_master_send(i2c_bus_eeprom, EEPROM_ADDR, RT_I2C_WR, addr_buf, 2);
    if (size != 2) {
        rt_kprintf("RD1.EEPROM write failed, size is:%d\n", size);
        return -RT_ERROR;
    }
    size = rt_i2c_master_recv(i2c_bus_eeprom, EEPROM_ADDR, RT_I2C_RD, buf, len);
    if (size != len) {
        rt_kprintf("RD2.EEPROM write failed, size is:%d\n", size);
        return -RT_ERROR;
    }

return RT_EOK;
}

int init_eeprom(void)
{
    struct rt_i2c_bit_ops *ops;
    i2c_bus_eeprom = rt_i2c_bus_device_find(EEPROM_I2CBUS_NAME);
    if(i2c_bus_eeprom == RT_NULL)
        return -1;
    ops = (struct rt_i2c_bit_ops *)i2c_bus_eeprom->priv;
    ops->delay_us = 0;
    return 0;
}
INIT_DEVICE_EXPORT(init_eeprom);
```
```c
static const struct rt_i2c_bit_ops stm32_bit_ops_default =
{
    .data     = RT_NULL,
    .set_sda  = stm32_set_sda,
    .set_scl  = stm32_set_scl,
    .get_sda  = stm32_get_sda,
    .get_scl  = stm32_get_scl,
    .udelay   = stm32_udelay,
    .delay_us = 1,
    .timeout  = 100
};
```
该结构是drv_soft_i2c驱动程序对应的一个默认参数,它相当于模板,用户可以使用默认的,也可以根据自己的情况来改变参数.