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William Clark 2024-01-08 19:44:36 +00:00
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@ -14,6 +14,7 @@ A C89 driver for the 3-axis accelerometer LIS3DH. Supports both I2C and SPI.
> - Double-click detection > - Double-click detection
> - 4D/6D orientation detection > - 4D/6D orientation detection
> - Sleep-to-Wake/Return-to-Sleep > - Sleep-to-Wake/Return-to-Sleep
> - Self test
## Examples ## Examples
@ -22,7 +23,7 @@ See the `example/` dir for complete code examples and explanations of LIS3DH ter
## Implementation ## Implementation
This driver requires the user to implement the following interface functions: This driver requires the user to implement the following interface functions:
This project has example interface code for I2C and SPI used on Raspberry Pi 4, and for STM32. This project has example interface code for I2C and SPI used on Raspberry Pi 4
```c ```c
/* initialise the "interface" */ /* initialise the "interface" */
int init(void); int init(void);
@ -59,32 +60,3 @@ int lis3dh_fifo_reset(lis3dh_t *lis3dh);
``` ```
All functions return `0` on success, and any non-zero value on error. All functions return `0` on success, and any non-zero value on error.
## STM32
Example i2c and SPI functions that work
### i2c
```c
#define LIS3DH_I2C_ADDR 0x18 /* can also be 0x19 */
int i2c_write(uint8_t reg, uint8_t value) {
uint8_t buf[2] = { reg, value };
HAL_I2C_Master_Transmit(&hi2c2, LIS3DH_I2C_ADDR << 1, buf, 2, HAL_MAX_DELAY);
return 0;
}
int i2c_read(uint8_t reg, uint8_t *dst, uint32_t size) {
if (size > 1) {
reg |= 0x80; /* auto-increment bit */
}
uint8_t send[2] = { reg, 0x00 };
HAL_I2C_Master_Transmit(&hi2c2, LIS3DH_I2C_ADDR << 1, send, 2, HAL_MAX_DELAY);
HAL_I2C_Master_Receive(&hi2c2, LIS3DH_I2C_ADDR << 1, dst, size, HAL_MAX_DELAY);
return 0;
}
```
### SPI
```c
TODO
```