\u5ef6\u65f6 200ms，\u5faa\u73af\u91c7\u6837\u3002<\/li>\n\u8865\u5145：\u4f20\u611f\u5668\u5185\u90e8\u6570\u636e\u5237\u65b0 100Hz（10ms \u66f4\u65b0\u4e00\u6b21），\u7a0b\u5e8f 200ms \u5237\u65b0\u5c4f\u5e55，\u663e\u793a\u901f\u5ea6\u6ee1\u8db3\u5b9e\u9a8c\u89c2\u5bdf\u9700\u6c42\u3002<\/p>\n
main.c\u4ee3\u7801<\/h3>\n
\/*
\n * ADXL345 three-axis acceleration teaching demo
\n * ADXL345 SDA -> PA0, SCK\/SCL -> PA1
\n * OLED SCL -> PB8, SDA -> PB9
\n *\/
\n#include "delay.h"
\n#include "sys.h"
\n#include "oled.h"
\n#include "ADXL345.h"<\/p>\n
#define ADXL345_REFRESH_MS 200U<\/p>\n
static void ADXL345_ShowData(const ADXL345_DataTypeDef *data);
\nstatic void ADXL345_ShowError(u8 device_id);
\nstatic void OLED_ShowSignedNum(u8 x, u8 y, s32 value, u8 digits, u8 size);
\nstatic void OLED_ShowHexByte(u8 x, u8 y, u8 value, u8 size);<\/p>\n
int main(void)
\n{
\nADXL345_DataTypeDef sensor_data;
\nu8 sensor_ok;<\/p>\n
delay_init();
\nNVIC_Configuration();
\nOLED_Init();
\nOLED_ColorTurn(0);
\nOLED_DisplayTurn(0);<\/p>\n
OLED_Clear();
\nOLED_ShowString(36, 0, (u8 *)"ADXL345", 16);
\nOLED_ShowString(16, 22, (u8 *)"SDA PA0 SCK PA1", 12);
\nOLED_ShowString(25, 42, (u8 *)"Initializing", 12);
\nOLED_Refresh();<\/p>\n
sensor_ok = ADXL345_Init();<\/p>\n
while(1)
\n{
\nif((sensor_ok != 0U) && (ADXL345_ReadAcceleration(&sensor_data) != 0U))
\n{
\nADXL345_ShowData(&sensor_data);
\ndelay_ms(ADXL345_REFRESH_MS);
\n}
\nelse
\n{
\nADXL345_ShowError(ADXL345_ReadDeviceID());
\ndelay_ms(1000);
\nsensor_ok = ADXL345_Init();
\n}
\n}
\n}<\/p>\n
static void ADXL345_ShowData(const ADXL345_DataTypeDef *data)
\n{
\nOLED_Clear();
\nOLED_ShowString(16, 0, (u8 *)"ADXL345 +\/-16g", 12);<\/p>\n
OLED_ShowString(0, 16, (u8 *)"X:", 12);
\nOLED_ShowSignedNum(18, 16, ADXL345_RawToMilliG(data->x), 5U, 12);
\nOLED_ShowString(54, 16, (u8 *)" mg", 12);<\/p>\n
OLED_ShowString(0, 32, (u8 *)"Y:", 12);
\nOLED_ShowSignedNum(18, 32, ADXL345_RawToMilliG(data->y), 5U, 12);
\nOLED_ShowString(54, 32, (u8 *)" mg", 12);<\/p>\n
OLED_ShowString(0, 48, (u8 *)"Z:", 12);
\nOLED_ShowSignedNum(18, 48, ADXL345_RawToMilliG(data->z), 5U, 12);
\nOLED_ShowString(54, 48, (u8 *)" mg", 12);<\/p>\n
OLED_Refresh();
\n}<\/p>\n
static void ADXL345_ShowError(u8 device_id)
\n{
\nOLED_Clear();
\nOLED_ShowString(36, 0, (u8 *)"ADXL345", 16);
\nOLED_ShowString(22, 20, (u8 *)"Sensor error", 12);
\nOLED_ShowString(10, 36, (u8 *)"SDA PA0 SCK PA1", 12);
\nOLED_ShowString(34, 50, (u8 *)"ID:0x", 12);
\nOLED_ShowHexByte(64, 50, device_id, 12);
\nOLED_Refresh();
\n}<\/p>\n
static void OLED_ShowSignedNum(u8 x, u8 y, s32 value, u8 digits, u8 size)
\n{
\nu32 magnitude;<\/p>\n
if(value < 0)
\n{
\nOLED_ShowChar(x, y, '-', size);
\nmagnitude = (u32)(-value);
\n}
\nelse
\n{
\nOLED_ShowChar(x, y, '+', size);
\nmagnitude = (u32)value;
\n}
\nOLED_ShowNum((u8)(x + size \/ 2U), y, magnitude, digits, size);
\n}<\/p>\n
static void OLED_ShowHexByte(u8 x, u8 y, u8 value, u8 size)
\n{
\nu8 high;
\nu8 low;<\/p>\n
high = (u8)((value >> 4) & 0x0FU);
\nlow = (u8)(value & 0x0FU);
\nOLED_ShowChar(x, y, (high < 10U) ? (u8)('0' + high) : (u8)('A' + high – 10U), size);
\nOLED_ShowChar((u8)(x + size \/ 2U), y,
\n (low < 10U) ? (u8)('0' + low) : (u8)('A' + low – 10U), size);
\n}<\/p>\n
ADXL345.c\u4ee3\u7801<\/h3>\n
#include "ADXL345.h"
\n#include "delay.h"<\/p>\n
\/*
\n * ADXL345 \u8f6f\u4ef6 I2C \u9a71\u52a8
\n *
\n * \u786c\u4ef6\u8fde\u63a5：
\n * ADXL345 SDA -> STM32F103C8T6 PA0
\n * ADXL345 SCK\/SCL -> STM32F103C8T6 PA1
\n *
\n * PA0 \u548c PA1 \u914d\u7f6e\u6210\u5f00\u6f0f\u8f93\u51fa，\u901a\u8fc7\u8f6f\u4ef6\u6a21\u62df I2C \u65f6\u5e8f\u3002
\n * CS \u5f15\u811a\u5fc5\u987b\u63a5 3.3V \u4ee5\u9009\u62e9 I2C \u6a21\u5f0f；ALT ADDRESS\/SDO \u63a5\u5730\u65f6，
\n * ADXL345 \u7684 7 \u4f4d\u4ece\u673a\u5730\u5740\u4e3a 0x53，\u5bf9\u5e94\u5199\u5730\u5740 0xA6\u3001\u8bfb\u5730\u5740 0xA7\u3002
\n *\/<\/p>\n
\/* I2C \u4ece\u673a\u5730\u5740：\u6700\u4f4e\u4f4d\u7531\u8bfb\u5199\u65b9\u5411\u81ea\u52a8\u8865\u5145\u3002 *\/
\n#define ADXL345_I2C_ADDRESS 0x53U
\n#define ADXL345_WRITE_ADDRESS (ADXL345_I2C_ADDRESS << 1)
\n#define ADXL345_READ_ADDRESS ((ADXL345_I2C_ADDRESS << 1) | 0x01U)<\/p>\n
\/* \u672c\u9a71\u52a8\u4f7f\u7528\u7684 ADXL345 \u5bc4\u5b58\u5668\u5730\u5740\u3002 *\/
\n#define ADXL345_REG_DEVID 0x00U \/* \u5668\u4ef6\u6807\u8bc6\u5bc4\u5b58\u5668，\u56fa\u5b9a\u503c\u4e3a 0xE5 *\/
\n#define ADXL345_REG_OFSX 0x1EU \/* X \u8f74\u96f6\u504f\u6821\u51c6\u5bc4\u5b58\u5668 *\/
\n#define ADXL345_REG_OFSY 0x1FU \/* Y \u8f74\u96f6\u504f\u6821\u51c6\u5bc4\u5b58\u5668 *\/
\n#define ADXL345_REG_OFSZ 0x20U \/* Z \u8f74\u96f6\u504f\u6821\u51c6\u5bc4\u5b58\u5668 *\/
\n#define ADXL345_REG_BW_RATE 0x2CU \/* \u8f93\u51fa\u6570\u636e\u901f\u7387\u548c\u4f4e\u529f\u8017\u63a7\u5236\u5bc4\u5b58\u5668 *\/
\n#define ADXL345_REG_POWER_CTL 0x2DU \/* \u7535\u6e90\u6a21\u5f0f\u548c\u6d4b\u91cf\u6a21\u5f0f\u63a7\u5236\u5bc4\u5b58\u5668 *\/
\n#define ADXL345_REG_INT_ENABLE 0x2EU \/* \u4e2d\u65ad\u4f7f\u80fd\u5bc4\u5b58\u5668 *\/
\n#define ADXL345_REG_DATA_FORMAT 0x31U \/* \u91cf\u7a0b\u3001\u5168\u5206\u8fa8\u7387\u548c\u6570\u636e\u683c\u5f0f\u5bc4\u5b58\u5668 *\/
\n#define ADXL345_REG_DATAX0 0x32U \/* \u4e09\u8f74\u6570\u636e\u8d77\u59cb\u5730\u5740：DATAX0～DATAZ1 *\/
\n#define ADXL345_REG_FIFO_CTL 0x38U \/* FIFO \u5de5\u4f5c\u6a21\u5f0f\u63a7\u5236\u5bc4\u5b58\u5668 *\/<\/p>\n
\/* \u8f6f\u4ef6 I2C \u5f15\u811a\u64cd\u4f5c：\u5f00\u6f0f\u8f93\u51fa\u5199 1 \u8868\u793a\u91ca\u653e\u603b\u7ebf，\u5199 0 \u8868\u793a\u62c9\u4f4e\u603b\u7ebf\u3002 *\/
\n#define ADXL345_SDA_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_0)
\n#define ADXL345_SDA_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_0)
\n#define ADXL345_SCL_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_1)
\n#define ADXL345_SCL_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_1)
\n#define ADXL345_READ_SDA() GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)<\/p>\n
\/* \u8f6f\u4ef6 I2C \u5e95\u5c42\u51fd\u6570，\u53ea\u5728\u672c\u6587\u4ef6\u5185\u90e8\u4f7f\u7528\u3002 *\/
\nstatic void ADXL345_I2C_Delay(void);
\nstatic void ADXL345_I2C_Start(void);
\nstatic void ADXL345_I2C_Stop(void);
\nstatic void ADXL345_I2C_SendAck(u8 send_ack);
\nstatic u8 ADXL345_I2C_SendByte(u8 data);
\nstatic u8 ADXL345_I2C_ReadByte(void);
\nstatic void ADXL345_I2C_BusRecovery(void);<\/p>\n
\/*
\n * I2C \u65f6\u5e8f\u5ef6\u65f6\u3002
\n * 5us \u534a\u5468\u671f\u5bf9\u5e94\u7684\u603b\u7ebf\u901f\u5ea6\u4f4e\u4e8e 100kHz，\u9002\u5408\u6559\u5b66\u548c\u675c\u90a6\u7ebf\u8fde\u63a5\u73af\u5883\u3002
\n *\/
\nstatic void ADXL345_I2C_Delay(void)
\n{
\ndelay_us(5);
\n}<\/p>\n
\/*
\n * \u4ea7\u751f I2C \u8d77\u59cb\u4fe1\u53f7：
\n * SCL \u4e3a\u9ad8\u7535\u5e73\u65f6，SDA \u7531\u9ad8\u7535\u5e73\u53d8\u4e3a\u4f4e\u7535\u5e73\u3002
\n *\/
\nstatic void ADXL345_I2C_Start(void)
\n{
\nADXL345_SDA_HIGH();
\nADXL345_SCL_HIGH();
\nADXL345_I2C_Delay();
\nADXL345_SDA_LOW();
\nADXL345_I2C_Delay();
\nADXL345_SCL_LOW();
\nADXL345_I2C_Delay();
\n}<\/p>\n
\/*
\n * \u4ea7\u751f I2C \u505c\u6b62\u4fe1\u53f7：
\n * SCL \u4e3a\u9ad8\u7535\u5e73\u65f6，SDA \u7531\u4f4e\u7535\u5e73\u53d8\u4e3a\u9ad8\u7535\u5e73\u3002
\n *\/
\nstatic void ADXL345_I2C_Stop(void)
\n{
\nADXL345_SCL_LOW();
\nADXL345_SDA_LOW();
\nADXL345_I2C_Delay();
\nADXL345_SCL_HIGH();
\nADXL345_I2C_Delay();
\nADXL345_SDA_HIGH();
\nADXL345_I2C_Delay();
\n}<\/p>\n
\/*
\n * \u4ece\u6700\u9ad8\u4f4d\u5f00\u59cb\u5411 I2C \u603b\u7ebf\u53d1\u9001\u4e00\u4e2a\u5b57\u8282，\u5e76\u8bfb\u53d6\u4ece\u673a\u5e94\u7b54\u3002
\n * \u8fd4\u56de\u503c：1 \u8868\u793a\u6536\u5230 ACK，0 \u8868\u793a\u6536\u5230 NACK\u3002
\n *\/
\nstatic u8 ADXL345_I2C_SendByte(u8 data)
\n{
\nu8 i;
\nu8 acknowledged;<\/p>\n
\/* \u4f9d\u6b21\u53d1\u9001 D7～D0，\u6bcf\u4e2a\u65f6\u949f\u5468\u671f\u53d1\u9001\u4e00\u4f4d\u3002 *\/
\nfor(i = 0U; i < 8U; i++)
\n{
\nADXL345_SCL_LOW();
\nif((data & 0x80U) != 0U)
\nADXL345_SDA_HIGH();
\nelse
\nADXL345_SDA_LOW();
\nADXL345_I2C_Delay();
\nADXL345_SCL_HIGH();
\nADXL345_I2C_Delay();
\ndata <<= 1;
\n}<\/p>\n
\/*
\n * \u7b2c 9 \u4e2a\u65f6\u949f\u7528\u4e8e\u8bfb\u53d6\u5e94\u7b54：\u5148\u91ca\u653e SDA，\u518d\u7531 ADXL345 \u62c9\u4f4e SDA\u3002
\n * SDA \u4e3a\u4f4e\u8868\u793a ACK，\u8bf4\u660e\u4ece\u673a\u5df2\u7ecf\u6b63\u786e\u63a5\u6536\u5f53\u524d\u5b57\u8282\u3002
\n *\/
\nADXL345_SCL_LOW();
\nADXL345_SDA_HIGH();
\nADXL345_I2C_Delay();
\nADXL345_SCL_HIGH();
\nADXL345_I2C_Delay();
\nacknowledged = (ADXL345_READ_SDA() == Bit_RESET) ? 1U : 0U;
\nADXL345_SCL_LOW();
\nADXL345_I2C_Delay();<\/p>\n
return acknowledged;
\n}<\/p>\n
\/*
\n * \u4ece I2C \u603b\u7ebf\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282，\u6309 D7～D0 \u7684\u987a\u5e8f\u63a5\u6536\u3002
\n * \u672c\u51fd\u6570\u53ea\u8d1f\u8d23\u8bfb\u53d6 8 \u4f4d\u6570\u636e，\u8bfb\u5b8c\u540e\u7684 ACK\/NACK \u7531\u8c03\u7528\u8005\u53d1\u9001\u3002
\n *\/
\nstatic u8 ADXL345_I2C_ReadByte(void)
\n{
\nu8 i;
\nu8 data;<\/p>\n
data = 0U;
\nADXL345_SDA_HIGH();
\nfor(i = 0U; i < 8U; i++)
\n{
\nADXL345_SCL_LOW();
\nADXL345_I2C_Delay();
\nADXL345_SCL_HIGH();
\nADXL345_I2C_Delay();
\ndata <<= 1;
\nif(ADXL345_READ_SDA() != Bit_RESET)
\ndata |= 0x01U;
\n}
\nADXL345_SCL_LOW();
\nADXL345_I2C_Delay();<\/p>\n
return data;
\n}<\/p>\n
\/*
\n * \u4e3b\u673a\u5411\u4ece\u673a\u53d1\u9001\u5e94\u7b54\u4f4d\u3002
\n * send_ack = 1：\u53d1\u9001 ACK，\u8868\u793a\u8fd8\u8981\u7ee7\u7eed\u8bfb\u53d6\u540e\u7eed\u5b57\u8282；
\n * send_ack = 0：\u53d1\u9001 NACK，\u8868\u793a\u5f53\u524d\u5b57\u8282\u662f\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u3002
\n *\/
\nstatic void ADXL345_I2C_SendAck(u8 send_ack)
\n{
\nADXL345_SCL_LOW();
\nif(send_ack != 0U)
\nADXL345_SDA_LOW();
\nelse
\nADXL345_SDA_HIGH();
\nADXL345_I2C_Delay();
\nADXL345_SCL_HIGH();
\nADXL345_I2C_Delay();
\nADXL345_SCL_LOW();
\nADXL345_SDA_HIGH();
\nADXL345_I2C_Delay();
\n}<\/p>\n
\/*
\n * I2C \u603b\u7ebf\u6062\u590d：\u91ca\u653e SDA \u540e\u8f93\u51fa 9 \u4e2a SCL \u8109\u51b2，\u518d\u53d1\u9001\u505c\u6b62\u4fe1\u53f7\u3002
\n * \u5982\u679c\u4ece\u673a\u56e0\u4e0a\u6b21\u901a\u4fe1\u88ab\u610f\u5916\u4e2d\u65ad\u800c\u4e00\u76f4\u5360\u7528 SDA，\u8be5\u64cd\u4f5c\u53ef\u4f7f\u5176\u9000\u51fa\u672a\u5b8c\u6210\u72b6\u6001\u3002
\n *\/
\nstatic void ADXL345_I2C_BusRecovery(void)
\n{
\nu8 i;<\/p>\n
ADXL345_SDA_HIGH();
\nfor(i = 0U; i < 9U; i++)
\n{
\nADXL345_SCL_LOW();
\nADXL345_I2C_Delay();
\nADXL345_SCL_HIGH();
\nADXL345_I2C_Delay();
\n}
\nADXL345_I2C_Stop();
\n}<\/p>\n
\/*
\n * \u5411 ADXL345 \u7684\u6307\u5b9a\u5bc4\u5b58\u5668\u5199\u5165\u4e00\u4e2a\u5b57\u8282\u3002
\n * \u901a\u4fe1\u987a\u5e8f：\u8d77\u59cb\u4fe1\u53f7 -> \u5199\u5730\u5740 -> \u5bc4\u5b58\u5668\u5730\u5740 -> \u6570\u636e -> \u505c\u6b62\u4fe1\u53f7\u3002
\n * \u4efb\u610f\u9636\u6bb5\u672a\u6536\u5230 ACK \u90fd\u4f1a\u7acb\u5373\u505c\u6b62\u901a\u4fe1\u5e76\u8fd4\u56de 0\u3002
\n *\/
\nu8 ADXL345_WriteRegister(u8 register_address, u8 data)
\n{
\nADXL345_I2C_Start();
\nif(ADXL345_I2C_SendByte(ADXL345_WRITE_ADDRESS) == 0U)
\n{
\nADXL345_I2C_Stop();
\nreturn 0U;
\n}
\nif(ADXL345_I2C_SendByte(register_address) == 0U)
\n{
\nADXL345_I2C_Stop();
\nreturn 0U;
\n}
\nif(ADXL345_I2C_SendByte(data) == 0U)
\n{
\nADXL345_I2C_Stop();
\nreturn 0U;
\n}
\nADXL345_I2C_Stop();<\/p>\n
return 1U;
\n}<\/p>\n
\/*
\n * \u4ece\u6307\u5b9a\u8d77\u59cb\u5bc4\u5b58\u5668\u8fde\u7eed\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282\u3002
\n *
\n * \u5148\u4ee5\u5199\u65b9\u5411\u53d1\u9001\u5bc4\u5b58\u5668\u5730\u5740，\u518d\u53d1\u9001\u91cd\u590d\u8d77\u59cb\u4fe1\u53f7\u5e76\u5207\u6362\u5230\u8bfb\u65b9\u5411；
\n * \u9664\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u5916，\u6bcf\u8bfb\u5b8c\u4e00\u4e2a\u5b57\u8282\u90fd\u53d1\u9001 ACK，\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u53d1\u9001 NACK\u3002
\n *\/
\nu8 ADXL345_ReadRegisters(u8 start_address, u8 *data, u8 length)
\n{
\nu8 i;<\/p>\n
if((data == 0) || (length == 0U))
\nreturn 0U;<\/p>\n
ADXL345_I2C_Start();
\nif(ADXL345_I2C_SendByte(ADXL345_WRITE_ADDRESS) == 0U)
\n{
\nADXL345_I2C_Stop();
\nreturn 0U;
\n}
\nif(ADXL345_I2C_SendByte(start_address) == 0U)
\n{
\nADXL345_I2C_Stop();
\nreturn 0U;
\n}<\/p>\n
ADXL345_I2C_Start();
\nif(ADXL345_I2C_SendByte(ADXL345_READ_ADDRESS) == 0U)
\n{
\nADXL345_I2C_Stop();
\nreturn 0U;
\n}<\/p>\n
for(i = 0U; i < length; i++)
\n{
\ndata[i] = ADXL345_I2C_ReadByte();
\nADXL345_I2C_SendAck((i < (u8)(length – 1U)) ? 1U : 0U);
\n}
\nADXL345_I2C_Stop();<\/p>\n
return 1U;
\n}<\/p>\n
\/* \u4ece\u6307\u5b9a\u5bc4\u5b58\u5668\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282，\u662f\u8fde\u7eed\u8bfb\u53d6\u63a5\u53e3\u7684\u5355\u5b57\u8282\u5c01\u88c5\u3002 *\/
\nu8 ADXL345_ReadRegister(u8 register_address, u8 *data)
\n{
\nreturn ADXL345_ReadRegisters(register_address, data, 1U);
\n}<\/p>\n
\/*
\n * \u8bfb\u53d6\u5668\u4ef6\u6807\u8bc6\u5bc4\u5b58\u5668\u3002
\n * \u6b63\u5e38\u8fde\u63a5\u7684 ADXL345 \u5e94\u8fd4\u56de 0xE5；\u901a\u4fe1\u5931\u8d25\u65f6\u8fd4\u56de\u521d\u59cb\u503c 0x00\u3002
\n *\/
\nu8 ADXL345_ReadDeviceID(void)
\n{
\nu8 device_id;<\/p>\n
device_id = 0U;
\n(void)ADXL345_ReadRegister(ADXL345_REG_DEVID, &device_id);
\nreturn device_id;
\n}<\/p>\n
\/*
\n * \u521d\u59cb\u5316\u8f6f\u4ef6 I2C \u5f15\u811a\u548c ADXL345 \u5de5\u4f5c\u53c2\u6570\u3002
\n *
\n * \u914d\u7f6e\u8fc7\u7a0b：
\n * 1. \u5c06 PA0\u3001PA1 \u914d\u7f6e\u4e3a 50MHz \u5f00\u6f0f\u8f93\u51fa，\u5e76\u6062\u590d I2C \u603b\u7ebf；
\n * 2. \u8bfb\u53d6 DEVID，\u786e\u8ba4\u8fde\u63a5\u7684\u5668\u4ef6\u786e\u5b9e\u662f ADXL345；
\n * 3. \u8fdb\u5165\u5f85\u673a\u6a21\u5f0f\u540e\u914d\u7f6e\u5168\u5206\u8fa8\u7387\u3001\u00b116g \u548c 100Hz \u6570\u636e\u901f\u7387；
\n * 4. \u6e05\u96f6\u4e09\u8f74\u504f\u79fb\u91cf，\u5173\u95ed\u672c\u793a\u4f8b\u672a\u4f7f\u7528\u7684\u4e2d\u65ad\u548c FIFO；
\n * 5. \u8bbe\u7f6e MEASURE \u4f4d，\u5f00\u59cb\u8fde\u7eed\u6d4b\u91cf\u3002
\n *
\n * \u8fd4\u56de\u503c：1 \u8868\u793a\u521d\u59cb\u5316\u6210\u529f，0 \u8868\u793a\u5668\u4ef6\u6807\u8bc6\u9519\u8bef\u6216\u5bc4\u5b58\u5668\u5199\u5165\u5931\u8d25\u3002
\n *\/
\nu8 ADXL345_Init(void)
\n{
\nGPIO_InitTypeDef gpio_init_structure;<\/p>\n
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
\ngpio_init_structure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
\ngpio_init_structure.GPIO_Speed = GPIO_Speed_50MHz;
\ngpio_init_structure.GPIO_Mode = GPIO_Mode_Out_OD;
\nGPIO_Init(GPIOA, &gpio_init_structure);
\nADXL345_SDA_HIGH();
\nADXL345_SCL_HIGH();
\ndelay_ms(5);
\nADXL345_I2C_BusRecovery();<\/p>\n
if(ADXL345_ReadDeviceID() != ADXL345_DEVICE_ID)
\nreturn 0U;<\/p>\n
\/* \u4fee\u6539\u6d4b\u91cf\u53c2\u6570\u524d\u5148\u8fdb\u5165\u5f85\u673a\u6a21\u5f0f\u3002 *\/
\nif(ADXL345_WriteRegister(ADXL345_REG_POWER_CTL, 0x00U) == 0U)
\nreturn 0U;
\n\/* FULL_RES = 1\u3001Range = 11，\u9009\u62e9\u5168\u5206\u8fa8\u7387\u548c \u00b116g \u91cf\u7a0b\u3002 *\/
\nif(ADXL345_WriteRegister(ADXL345_REG_DATA_FORMAT, 0x0BU) == 0U)
\nreturn 0U;
\n\/* LOW_POWER = 0\u3001Rate = 0x0A，\u9009\u62e9\u6b63\u5e38\u529f\u8017\u548c 100Hz \u8f93\u51fa\u901f\u7387\u3002 *\/
\nif(ADXL345_WriteRegister(ADXL345_REG_BW_RATE, 0x0AU) == 0U)
\nreturn 0U;
\n\/* \u6559\u5b66\u6f14\u793a\u6682\u4e0d\u8fdb\u884c\u96f6\u504f\u6821\u51c6，\u4e09\u4e2a\u504f\u79fb\u5bc4\u5b58\u5668\u5747\u5199\u5165 0\u3002 *\/
\nif(ADXL345_WriteRegister(ADXL345_REG_OFSX, 0x00U) == 0U)
\nreturn 0U;
\nif(ADXL345_WriteRegister(ADXL345_REG_OFSY, 0x00U) == 0U)
\nreturn 0U;
\nif(ADXL345_WriteRegister(ADXL345_REG_OFSZ, 0x00U) == 0U)
\nreturn 0U;
\n\/* \u672c\u6559\u5b66\u6f14\u793a\u91c7\u7528\u8f6e\u8be2\u8bfb\u53d6，\u56e0\u6b64\u5173\u95ed\u4e2d\u65ad\u548c FIFO \u529f\u80fd\u3002 *\/
\nif(ADXL345_WriteRegister(ADXL345_REG_INT_ENABLE, 0x00U) == 0U)
\nreturn 0U;
\nif(ADXL345_WriteRegister(ADXL345_REG_FIFO_CTL, 0x00U) == 0U)
\nreturn 0U;
\n\/* POWER_CTL \u7684 MEASURE \u4f4d\u7f6e 1，\u9000\u51fa\u5f85\u673a\u5e76\u5f00\u59cb\u8fde\u7eed\u8f6c\u6362\u3002 *\/
\nif(ADXL345_WriteRegister(ADXL345_REG_POWER_CTL, 0x08U) == 0U)
\nreturn 0U;
\ndelay_ms(10);<\/p>\n
return 1U;
\n}<\/p>\n
\/*
\n * \u4e00\u6b21\u8fde\u7eed\u8bfb\u53d6 DATAX0～DATAZ1 \u5171 6 \u4e2a\u5bc4\u5b58\u5668\u3002
\n * ADXL345 \u6309\u4f4e\u5b57\u8282\u5728\u524d\u3001\u9ad8\u5b57\u8282\u5728\u540e\u7684\u987a\u5e8f\u8f93\u51fa\u6570\u636e，\u5408\u5e76\u540e\u8f6c\u6362\u4e3a s16，
\n * \u4ece\u800c\u4fdd\u7559\u8d1f\u52a0\u901f\u5ea6\u7684\u4e8c\u8fdb\u5236\u8865\u7801\u7b26\u53f7\u3002
\n *\/
\nu8 ADXL345_ReadAcceleration(ADXL345_DataTypeDef *data)
\n{
\nu8 buffer[6];<\/p>\n
if(data == 0)
\nreturn 0U;
\nif(ADXL345_ReadRegisters(ADXL345_REG_DATAX0, buffer, 6U) == 0U)
\nreturn 0U;<\/p>\n
\/* \u6bcf\u4e2a\u8f74\u7531\u76f8\u90bb\u7684\u4f4e\u3001\u9ad8\u4e24\u4e2a\u5b57\u8282\u7ec4\u6210\u3002 *\/
\ndata->x = (s16)(((u16)buffer[1] << 8) | buffer[0]);
\ndata->y = (s16)(((u16)buffer[3] << 8) | buffer[2]);
\ndata->z = (s16)(((u16)buffer[5] << 8) | buffer[4]);<\/p>\n
return 1U;
\n}<\/p>\n
\/*
\n * \u5c06\u67d0\u4e00\u8f74\u7684\u539f\u59cb\u6570\u636e\u6362\u7b97\u6210 mg（\u6beb\u91cd\u529b\u52a0\u901f\u5ea6）\u3002
\n *
\n * \u5f53\u524d\u4e3a\u5168\u5206\u8fa8\u7387\u6a21\u5f0f，\u5178\u578b\u7075\u654f\u5ea6\u4e3a 3.9mg\/LSB：
\n * \u52a0\u901f\u5ea6(mg) = \u539f\u59cb\u6570\u636e \u00d7 3.9
\n * \u4f7f\u7528\u201c\u5148\u4e58 39\u3001\u518d\u9664 10\u201d\u7684\u6574\u6570\u8fd0\u7b97，\u907f\u514d\u5f15\u5165\u6d6e\u70b9\u8fd0\u7b97\u4ee3\u7801\u3002
\n *\/
\ns32 ADXL345_RawToMilliG(s16 raw_value)
\n{
\nreturn ((s32)raw_value * 39L) \/ 10L;
\n}<\/p>\n
ADXL345.h\u4ee3\u7801<\/h3>\n
#ifndef __ADXL345_H
\n#define __ADXL345_H<\/p>\n
#include "sys.h"<\/p>\n
\/*
\n * ADXL345 \u4e09\u8f74\u52a0\u901f\u5ea6\u4f20\u611f\u5668\u9a71\u52a8\u5934\u6587\u4ef6
\n *
\n * \u786c\u4ef6\u8fde\u63a5：
\n * ADXL345 SDA -> STM32F103C8T6 PA0
\n * ADXL345 SCK\/SCL -> STM32F103C8T6 PA1
\n *
\n * \u6ce8\u610f：ADXL345 \u7684 CS \u5f15\u811a\u9700\u8981\u63a5 3.3V，\u624d\u80fd\u8fdb\u5165 I2C \u901a\u4fe1\u6a21\u5f0f；
\n * ALT ADDRESS\/SDO \u63a5\u5730\u65f6，\u5668\u4ef6\u7684 7 \u4f4d I2C \u5730\u5740\u4e3a 0x53\u3002
\n *\/<\/p>\n
\/* ADXL345 \u7684\u56fa\u5b9a\u5668\u4ef6\u6807\u8bc6，\u8bfb\u53d6 DEVID \u5bc4\u5b58\u5668\u5e94\u5f97\u5230 0xE5\u3002 *\/
\n#define ADXL345_DEVICE_ID 0xE5U<\/p>\n
\/* \u4fdd\u5b58\u4e00\u6b21\u91c7\u6837\u5f97\u5230\u7684 X\u3001Y\u3001Z \u4e09\u8f74\u539f\u59cb\u6709\u7b26\u53f7\u6570\u636e\u3002 *\/
\ntypedef struct
\n{
\ns16 x; \/* X \u8f74\u539f\u59cb\u6570\u636e *\/
\ns16 y; \/* Y \u8f74\u539f\u59cb\u6570\u636e *\/
\ns16 z; \/* Z \u8f74\u539f\u59cb\u6570\u636e *\/
\n} ADXL345_DataTypeDef;<\/p>\n
\/*
\n * \u521d\u59cb\u5316 GPIO \u548c ADXL345\u3002
\n * \u914d\u7f6e\u4e3a\u5168\u5206\u8fa8\u7387\u3001\u00b116g\u3001100Hz \u8f93\u51fa\u6570\u636e\u901f\u7387\u5e76\u8fdb\u5165\u6d4b\u91cf\u6a21\u5f0f\u3002
\n * \u8fd4\u56de\u503c：1 \u8868\u793a\u521d\u59cb\u5316\u6210\u529f，0 \u8868\u793a\u901a\u4fe1\u6216\u5668\u4ef6\u68c0\u6d4b\u5931\u8d25\u3002
\n *\/
\nu8 ADXL345_Init(void);<\/p>\n
\/* \u8bfb\u53d6 DEVID \u5bc4\u5b58\u5668，\u6b63\u5e38\u6a21\u5757\u5e94\u8fd4\u56de ADXL345_DEVICE_ID（0xE5）\u3002 *\/
\nu8 ADXL345_ReadDeviceID(void);<\/p>\n
\/* \u5411\u6307\u5b9a\u5bc4\u5b58\u5668\u5199\u5165\u4e00\u4e2a\u5b57\u8282，\u6210\u529f\u8fd4\u56de 1，\u5931\u8d25\u8fd4\u56de 0\u3002 *\/
\nu8 ADXL345_WriteRegister(u8 register_address, u8 data);<\/p>\n
\/* \u4ece\u6307\u5b9a\u5bc4\u5b58\u5668\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282，\u6210\u529f\u8fd4\u56de 1，\u5931\u8d25\u8fd4\u56de 0\u3002 *\/
\nu8 ADXL345_ReadRegister(u8 register_address, u8 *data);<\/p>\n
\/* \u4ece start_address \u5f00\u59cb\u8fde\u7eed\u8bfb\u53d6 length \u4e2a\u5b57\u8282\u3002 *\/
\nu8 ADXL345_ReadRegisters(u8 start_address, u8 *data, u8 length);<\/p>\n
\/* \u8fde\u7eed\u8bfb\u53d6 X\u3001Y\u3001Z \u4e09\u8f74\u52a0\u901f\u5ea6\u539f\u59cb\u6570\u636e\u3002 *\/
\nu8 ADXL345_ReadAcceleration(ADXL345_DataTypeDef *data);<\/p>\n
\/*
\n * \u5c06\u539f\u59cb\u6570\u636e\u6362\u7b97\u4e3a mg（\u6beb\u91cd\u529b\u52a0\u901f\u5ea6）\u3002
\n * \u5168\u5206\u8fa8\u7387\u6a21\u5f0f\u4e0b\u7684\u5178\u578b\u6bd4\u4f8b\u7cfb\u6570\u4e3a 3.9mg\/LSB，1000mg \u7ea6\u7b49\u4e8e 1g\u3002
\n *\/
\ns32 ADXL345_RawToMilliG(s16 raw_value);<\/p>\n
#endif<\/p>\n
\u516d\u3001OLED \u5c4f\u5e55\u663e\u793a\u6548\u679c\u89e3\u6790<\/h3>\n6.1 \u6b63\u5e38\u8fd0\u884c\u754c\u9762<\/h4>\n
ADXL345 +\/-16g
\nX:+00000 mg
\nY:+00000 mg
\nZ:+00998 mg <\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260803130116-6a70911c361ea.png\")
<\/p>\n
\u5b57\u6bb5\u91ca\u4e49：<\/p>\n
\n- +\/-16g：\u5f53\u524d\u4f20\u611f\u5668\u6d4b\u91cf\u91cf\u7a0b；<\/li>\n
- X\/Y\/Z：\u4e09\u8f74\u52a0\u901f\u5ea6，\u6b63\u8d1f\u53f7\u4ee3\u8868\u53d7\u529b\u65b9\u5411；<\/li>\n
- mg：\u6beb\u91cd\u529b\u52a0\u901f\u5ea6\u5355\u4f4d\u3002<\/li>\n<\/ul>\n
6.2 \u901a\u4fe1\u6545\u969c\u62a5\u9519\u754c\u9762<\/h4>\n
ADXL345
\nSensor error
\nSDA PA0 SCK PA1
\nID:0x00 <\/p>\n
\u51fa\u73b0\u62a5\u9519\u6392\u67e5\u987a\u5e8f：\u4f9b\u7535\u3001\u5171\u5730\u3001CS \u5f15\u811a\u3001SDO \u5730\u5740\u5f15\u811a\u3001SDA\/SCL \u63a5\u7ebf\u3001I2C \u4e0a\u62c9\u7535\u963b\u3002<\/p>\n
\u4e03\u3001\u91cf\u7a0b\u3001\u5206\u8fa8\u7387\u4e0e\u5b9e\u9a8c\u73b0\u8c61\u5206\u6790<\/h3>\n
ADXL345 \u652f\u6301 4 \u6863\u91cf\u7a0b：\u00b12g\u3001\u00b14g\u3001\u00b18g\u3001\u00b116g；\u672c\u5de5\u7a0b\u9009\u7528 \u00b116g，\u53ef\u6355\u6349\u5927\u5e45\u5ea6\u6643\u52a8\u3001\u51b2\u51fb，\u5168\u5206\u8fa8\u7387\u6a21\u5f0f\u4e0b\u6240\u6709\u91cf\u7a0b\u7edf\u4e00 3.9mg\/LSB，\u00b116g \u53ef\u8fbe 13 \u4f4d\u9ad8\u7cbe\u5ea6\u3002<\/p>\n
- \u503e\u659c\u5b9e\u9a8c \u8bbe\u5907\u7f13\u6162\u503e\u659c，\u91cd\u529b\u77e2\u91cf\u5728\u4e09\u8f74\u91cd\u65b0\u5206\u914d，\u4e00\u4e2a\u8f74\u6570\u503c\u51cf\u5c0f，\u53e6\u4e00\u8f74\u589e\u5927；\u9759\u6b62\u72b6\u6001\u4e0b\u4e09\u8f74\u5e73\u65b9\u548c\u5f00\u6839\u53f7\u22481000mg\u3002<\/li>\n
- \u6643\u52a8\u51b2\u51fb\u5b9e\u9a8c \u5feb\u901f\u6446\u52a8\u3001\u6572\u51fb\u4f20\u611f\u5668，\u52a8\u6001\u52a0\u901f\u5ea6\u53e0\u52a0\u91cd\u529b\u5206\u91cf，\u5355\u8f74\u8bfb\u6570\u4f1a\u8d85\u8fc7 \u00b11000mg，\u5c5e\u4e8e\u6b63\u5e38\u73b0\u8c61，\u975e\u786c\u4ef6\u635f\u574f\u3002<\/li>\n
- \u81ea\u7531\u843d\u4f53\u5b9e\u9a8c \u8131\u624b\u81ea\u7531\u4e0b\u843d\u77ac\u95f4\u4e09\u8f74\u8bfb\u6570\u5168\u90e8\u63a5\u8fd1 0mg，\u5931\u91cd\u68c0\u6d4b\u662f ADXL345 \u5185\u7f6e\u529f\u80fd，\u672c\u5de5\u7a0b\u672a\u542f\u7528\u4e2d\u65ad\u3002\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260803130117-6a70911d49db9.png\")
<\/p>\n<\/li>\n
\u516b\u3001\u4f20\u611f\u5668\u8bef\u5dee\u6765\u6e90\u4e0e\u7b80\u6613\u6821\u51c6\u65b9\u6848<\/h3>\n
\u5b9e\u9645\u91c7\u6837\u6570\u503c\u548c\u7406\u8bba\u503c\u5b58\u5728\u504f\u5dee，\u4e3b\u8981\u8bef\u5dee\u6765\u6e90：<\/p>\n
- \u96f6\u504f\u8bef\u5dee：\u65e0\u91cd\u529b\u5206\u91cf\u8f74\u5b58\u5728\u56fa\u5b9a\u51e0\u5341 mg \u504f\u79fb；<\/li>\n
- \u7075\u654f\u5ea6\u8bef\u5dee：1g \u4f4d\u7f6e\u8bfb\u6570\u504f\u79bb 1000mg；<\/li>\n
- \u5b89\u88c5\u673a\u68b0\u8bef\u5dee：PCB \u5b89\u88c5\u4e0d\u6c34\u5e73，\u91cd\u529b\u5206\u89e3\u81f3\u591a\u8f74；<\/li>\n
- \u5e72\u6270\u8bef\u5dee：\u7535\u6e90\u6ce2\u52a8\u3001\u957f\u7ebf\u63a5\u7ebf\u3001\u7535\u673a\u632f\u52a8\u3001\u6e29\u5ea6\u6f02\u79fb\u3002<\/li>\n
\u7b80\u6613\u6821\u51c6\u6b65\u9aa4<\/h4>\n
- \u4f20\u611f\u5668\u6c34\u5e73\u9759\u6b62\u653e\u7f6e，\u591a\u6b21\u91c7\u6837\u53d6\u5e73\u5747\u503c，\u964d\u4f4e\u968f\u673a\u6296\u52a8；<\/li>\n
- \u786e\u5b9a\u7406\u8bba\u6807\u51c6\u503c（\u5e73\u653e Z \u8f74 + 1000mg，X\/Y \u4e3a 0mg）；<\/li>\n
- \u5e73\u5747\u503c\u51cf\u53bb\u7406\u8bba\u503c，\u5f97\u5230\u4e09\u8f74\u96f6\u504f\u8865\u507f\u503c；<\/li>\n
- \u4e24\u79cd\u8865\u507f\u65b9\u5f0f：\u8f6f\u4ef6\u8bfb\u53d6\u540e\u624b\u52a8\u51cf\u6cd5\u3001\u5199\u5165 OFSX\/OFSY\/OFSZ \u786c\u4ef6\u504f\u79fb\u5bc4\u5b58\u5668\u3002<\/li>\n
\u62d3\u5c55\u4f18\u5316：\u591a\u6b21\u91c7\u6837\u6ed1\u52a8\u5e73\u5747\u6ee4\u6ce2\u3001\u4e00\u9636\u4f4e\u901a\u6ee4\u6ce2，\u6d88\u9664\u6570\u503c\u6296\u52a8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001\u524d\u8a00
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