AMTS/Mieke/SW/MT/bma.c

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/*
Manufacturing tests for the new cortex minimal system
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/>.
*/
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#include "bma.h"
void init_bma(void)
{
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// Init GPIOB and I2C1 clocks
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
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// Create gpio struct and fill it with default values
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GPIO_InitTypeDef gpio;
GPIO_StructInit(&gpio);
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// Change default values for SCL port, init port
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gpio.GPIO_Mode = GPIO_Mode_AF_PP;
gpio.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOB, &gpio);
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// Change default values for SDA port, init port
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gpio.GPIO_Mode = GPIO_Mode_AF_OD;
gpio.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &gpio);
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// Create i2c struct, fill it with default values, change clock to 400 kHz and init I2C
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I2C_InitTypeDef i2c;
I2C_StructInit(&i2c);
i2c.I2C_ClockSpeed = 400000;
I2C_Init(I2C1, &i2c);
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// Enable I2C1 interface
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I2C_Cmd(I2C1, ENABLE);
}
void run_bma(float acc_f[3])
{
int16_t acc[3];
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// Send first register address to read
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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);
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// Start Rx transmission
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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));
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// Read X LSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
acc[0] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
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// Read X MSB
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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;
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// Read Y LSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
acc[1] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
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// Read Y MSB
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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;
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// Read Z LSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
acc[2] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
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// Read Z MSB
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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;
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// Stop condition
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I2C_GenerateSTOP(I2C1, ENABLE);
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// Calculate float values, with a maximum amplitude of 2.0g, as described in the datasheet
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acc_f[0] = 2.0f * ((float)acc[0]/512);
acc_f[1] = 2.0f * ((float)acc[1]/512);
acc_f[2] = 2.0f * ((float)acc[2]/512);
}
void deinit_bma(void)
{
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// Disable I2C1 and de-init it
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I2C_Cmd(I2C1, DISABLE);
I2C_DeInit(I2C1);
}