BMA456 initialization failure

[Minhwan]

Yes, you are right, if the value of 0x2A register is 0x00, it means BMA456 isn't initialized yet. 

I will check it once you upload it. 

Thanks, 

[MBEonas · Accepted solution]

I found the issue while investigating the I2C.

Our I2C driver inserted a start and stopp after writing the first byte (the register address) of the burst transfer. Once we got rid of this behaviour, the BMA456 responds correctly after initialization.

Best Regards

[QQW]

我使用STM32进行计步但是在对bma456写入配置时出错，在此前每一步都是成功的，但是去读0X2A的状态是0，这意味着并没有初始化，怎么回事? 我使用了IIc接口 请尽快回复 谢谢！

 附上我们的程序：

[Jayesh]

@MBEonas

Can you please suggest how to did you remove the start/stop condition after the first register write of the burst. Or how can I confirm if I am facing the same issue?

[Aisha]

Hello,

may i ask how you performed the linkage for i2c read and write functions, i have some problem linking those, i tried to copy some of the bits from the code you provided, so i have the following:

BMA4_INTF_RET_TYPE bma4_i2c_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, void *intf_ptr)
{
uint8_t dev_addr = *(uint8_t*)intf_ptr;

return i2c_burst_read(intf_ptr, 0x18, reg_addr, reg_data, len);

}

/*!
* I2C write function map to COINES platform
*/
BMA4_INTF_RET_TYPE bma4_i2c_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t len, void *intf_ptr)
{
uint8_t dev_addr = *(uint8_t*)intf_ptr;
return i2c_burst_write(intf_ptr, 0x18, reg_addr, reg_data, len);
}

and in the init function i have:

struct device *i2c_dev = device_get_binding("I2C_2");

and:

bma->intf = BMA4_I2C_INTF;
bma->bus_read = bma4_i2c_read;
bma->bus_write = bma4_i2c_write;
bma->intf_ptr = i2c_dev;

i have a bus fault possabily cased by a null pointer some where. it would be great if you showed me the steps for doing this linkage.