mirror of
https://github.com/EranMorkon/AMTS.git
synced 2023-12-28 16:48:38 +00:00
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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#include "bma.h"
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void init_bma(void)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
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GPIO_InitTypeDef gpio;
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GPIO_StructInit(&gpio);
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// SCL
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gpio.GPIO_Mode = GPIO_Mode_AF_PP;
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gpio.GPIO_Pin = GPIO_Pin_6;
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GPIO_Init(GPIOB, &gpio);
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// SDA
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gpio.GPIO_Mode = GPIO_Mode_AF_OD;
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gpio.GPIO_Pin = GPIO_Pin_7;
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GPIO_Init(GPIOB, &gpio);
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I2C_InitTypeDef i2c;
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I2C_StructInit(&i2c);
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i2c.I2C_ClockSpeed = 400000;
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I2C_Init(I2C1, &i2c);
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I2C_Cmd(I2C1, ENABLE);
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}
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void run_bma(float acc_f[3])
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{
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int16_t acc[3];
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// Select first register address to read
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I2C_GenerateSTART(I2C1, ENABLE);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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I2C_Send7bitAddress(I2C1, BMA_ADDR, I2C_Direction_Transmitter);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
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I2C_SendData(I2C1, 0x02);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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I2C_GenerateSTOP(I2C1, ENABLE);
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I2C_GenerateSTART(I2C1, ENABLE);
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I2C_AcknowledgeConfig(I2C1, ENABLE);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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I2C_Send7bitAddress(I2C1, BMA_ADDR, I2C_Direction_Receiver);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
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// X LSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
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acc[0] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
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// X MSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
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acc[0] = (I2C_ReceiveData(I2C1) & 0xFF) << 2 | (acc[0] & 0x0003);
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if(acc[0] & 0x0200) acc[0] |= 0xFC00;
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// Y LSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
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acc[1] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
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// Y MSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
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acc[1] = (I2C_ReceiveData(I2C1) & 0xFF) << 2 | (acc[1] & 0x0003);
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if(acc[1] & 0x0200) acc[1] |= 0xFC00;
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// Z LSB
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
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acc[2] = (I2C_ReceiveData(I2C1) & 0xC0) >> 6;
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// Z MSB
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I2C_AcknowledgeConfig(I2C1, DISABLE);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
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acc[2] = (I2C_ReceiveData(I2C1) & 0xFF) << 2 | (acc[2] & 0x0003);
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if(acc[2] & 0x0200) acc[2] |= 0xFC00;
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I2C_GenerateSTOP(I2C1, ENABLE);
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acc_f[0] = 2.0f * ((float)acc[0]/512);
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acc_f[1] = 2.0f * ((float)acc[1]/512);
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acc_f[2] = 2.0f * ((float)acc[2]/512);
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}
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void deinit_bma(void)
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{
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I2C_Cmd(I2C1, DISABLE);
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I2C_DeInit(I2C1);
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}
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