mirror of
https://github.com/EranMorkon/AMTS.git
synced 2023-12-28 16:48:38 +00:00
83 lines
3 KiB
C
83 lines
3 KiB
C
/*
|
|
Demo program for the 2017/18 open door day at HTL Hollabrunn
|
|
Copyright (C) 2018 Andreas Mieke
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "bma.h"
|
|
|
|
#define BMA_ADDR (uint8_t)0x70 // 0b01110000
|
|
// ---- Vendor address part
|
|
// --- User address part
|
|
// - Keep free for R/W bit (set by I2C_Send7bitAddress())
|
|
|
|
void bma_init(void)
|
|
{
|
|
i2c1_init();
|
|
}
|
|
|
|
void bma_get_acc(uint8_t *X, uint8_t *Y, uint8_t *Z)
|
|
{
|
|
int16_t acc[3];
|
|
// Send first register address to read
|
|
I2C_GenerateSTART(I2C1, ENABLE);
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
|
|
I2C_Send7bitAddress(I2C1, BMA_ADDR, I2C_Direction_Transmitter);
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
|
|
I2C_SendData(I2C1, 0x02);
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
|
|
I2C_GenerateSTOP(I2C1, ENABLE);
|
|
|
|
// Start Rx transmission
|
|
I2C_GenerateSTART(I2C1, ENABLE);
|
|
I2C_AcknowledgeConfig(I2C1, ENABLE);
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
|
|
I2C_Send7bitAddress(I2C1, BMA_ADDR, I2C_Direction_Receiver);
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
|
|
|
|
// Read X LSB
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
|
|
acc[0] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
|
|
// Read X MSB
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
|
|
acc[0] = (I2C_ReceiveData(I2C1) & 0xFF) << 2 | (acc[0] & 0x0003);
|
|
if(acc[0] & 0x0200) acc[0] |= 0xFC00;
|
|
|
|
// Read Y LSB
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
|
|
acc[1] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
|
|
// Read Y MSB
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
|
|
acc[1] = (I2C_ReceiveData(I2C1) & 0xFF) << 2 | (acc[1] & 0x0003);
|
|
if(acc[1] & 0x0200) acc[1] |= 0xFC00;
|
|
|
|
// Read Z LSB
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
|
|
acc[2] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
|
|
// Read Z MSB
|
|
I2C_AcknowledgeConfig(I2C1, DISABLE);
|
|
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
|
|
acc[2] = (I2C_ReceiveData(I2C1) & 0xFF) << 2 | (acc[2] & 0x0003);
|
|
if(acc[2] & 0x0200) acc[2] |= 0xFC00;
|
|
|
|
// Stop condition
|
|
I2C_GenerateSTOP(I2C1, ENABLE);
|
|
|
|
// Calculate display values, with a maximum amplitude of 2.0g, as described in the datasheet
|
|
*X = (acc[0]/4) + 128;
|
|
*Y = (acc[1]/4) + 128;
|
|
*Z = (acc[2]/4) + 128;
|
|
}
|