About kilohercas

in C, you can do like this: uint8_t *pointer; pointer = malloc(temp_len * sizeof(uint8_t )); I guess it's right way to do it. ... View more

ussually devices are MSB first, like most of bosh sensors ... View more

Very nice Bosh, very nice. So while reading forum i noticed, that read bit is not LSB, but MSB !!!! Now lets see what datasheet is saying: So bit zero is actually 0x80 or 10000000. Switched code for MSB bit for read operation, and what do you know, right answer in first time 🙂 Pseudo code: CSA LOW SEND(ADR | 0x80) SEND(0)//DUMMY DATA=SEND(0) CSA HIGH STM32L5 code: uint8_t BMI085_Read_Register_ACC(uint8_t adr) { uint8_t data = 0; SPI1_CSG_GPIO_Port->HIGH = SPI1_CSA_Pin|SPI1_CSG_Pin; SPI1_CSG_GPIO_Port->LOW = SPI1_CSA_Pin; asm("nop");asm("nop");asm("nop");asm("nop");asm("nop"); SPI1_Send_Recieve_byte(adr|0x80); SPI1_Send_Recieve_byte(0); data = SPI1_Send_Recieve_byte(0); asm("nop");asm("nop");asm("nop");asm("nop");asm("nop"); asm("nop");asm("nop");asm("nop");asm("nop");asm("nop"); asm("nop");asm("nop");asm("nop");asm("nop");asm("nop"); SPI1_CSG_GPIO_Port->HIGH = SPI1_CSA_Pin|SPI1_CSG_Pin; return data; } Please fix datasheet and add some complete SPI timing diagram. Just as i suspected, extremely poorly written datasheet !   ... View more

I was about to create thread with same error. in BMI085 API, i get two errors while compiling, by dynamicly alocating array in wrong way. static int8_t get_regs(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, struct bmi08x_dev *dev) { int8_t rslt = BMI08X_OK; uint16_t index; uint32_t temp_len = len + dev->dummy_byte; uint8_t temp_buff[temp_len]; //Error[Pe028]:temp_len expression must have a constant value ... View more