//------------------------------------------------------------------- // Filename: dma_bma.c // Description: dma_bma module library (I2C) //------------------------------------------------------------------- //------------------------------------------------------------------- // INCLUDES //------------------------------------------------------------------- /****************************************************************************** * INCLUDES */ #include "ioCC2530.h" //#include "hal_types.h" #include "hal_defs.h" #include "BMA020.h" #define BM(n) (1 << (n)) #define MCU_IO_TRISTATE 1 #define MCU_IO_PULLUP 2 #define MCU_IO_PULLDOWN 3 #define MCU_IO_OUTPUT(port, pin, val) MCU_IO_OUTPUT_PREP(port, pin, val) #define MCU_IO_OUTPUT_PREP(port, pin, val) st( P##port##SEL &= ~BM(pin); P##port##_##pin## = val; P##port##DIR |= BM(pin); ) #define MCU_IO_INPUT(port, pin, func) MCU_IO_INPUT_PREP(port, pin, func) #define MCU_IO_INPUT_PREP(port, pin, func) st( P##port##SEL &= ~BM(pin); P##port##DIR &= ~BM(pin); switch (func) { case MCU_IO_PULLUP: P##port##INP &= ~BM(pin); P2INP &= ~BM(port + 5); break; case MCU_IO_PULLDOWN: P##port##INP &= ~BM(pin); P2INP |= BM(port + 5); break; default: P##port##INP |= BM(pin); break; } ) #define MCU_IO_GET(port, pin) MCU_IO_GET_PREP(port, pin) #define MCU_IO_GET_PREP(port, pin) (P##port## & BM(pin)) #define HAL_BOARD_IO_SHT_SCK_PORT 1 #define HAL_BOARD_IO_SHT_SCK_PIN 6 #define HAL_BOARD_IO_SHT_SDA_PORT 1 #define HAL_BOARD_IO_SHT_SDA_PIN 5 #define HAL_BOARD_IO_E2PROM_SCL_PORT HAL_BOARD_IO_SHT_SCK_PORT #define HAL_BOARD_IO_E2PROM_SCL_PIN HAL_BOARD_IO_SHT_SCK_PIN #define HAL_E2PROM_SCK_DIR_OUT() MCU_IO_OUTPUT(HAL_BOARD_IO_SHT_SCK_PORT, HAL_BOARD_IO_SHT_SCK_PIN,0) #define HAL_E2PROM_SCK_SET() MCU_IO_OUTPUT(HAL_BOARD_IO_SHT_SCK_PORT, HAL_BOARD_IO_SHT_SCK_PIN,1) #define HAL_E2PROM_SCK_CLR() MCU_IO_OUTPUT(HAL_BOARD_IO_SHT_SCK_PORT, HAL_BOARD_IO_SHT_SCK_PIN,0) #define HAL_E2PROM_SCL_DIR_OUT HAL_E2PROM_SCK_DIR_OUT #define HAL_E2PROM_SCL_SET HAL_E2PROM_SCK_SET #define HAL_E2PROM_SCL_CLR HAL_E2PROM_SCK_CLR #define HAL_E2PROM_SDA_SET() MCU_IO_OUTPUT(HAL_BOARD_IO_SHT_SDA_PORT, HAL_BOARD_IO_SHT_SDA_PIN,1) #define HAL_E2PROM_SDA_CLR() MCU_IO_OUTPUT(HAL_BOARD_IO_SHT_SDA_PORT, HAL_BOARD_IO_SHT_SDA_PIN,0) #define HAL_E2PROM_SDA_DIR_OUT() MCU_IO_OUTPUT(HAL_BOARD_IO_SHT_SDA_PORT, HAL_BOARD_IO_SHT_SDA_PIN,1) #define HAL_E2PROM_SDA_DIR_IN() MCU_IO_INPUT(HAL_BOARD_IO_SHT_SDA_PORT, HAL_BOARD_IO_SHT_SDA_PIN,2) #define HAL_E2PROM_SDA_VAL() MCU_IO_GET(HAL_BOARD_IO_SHT_SDA_PORT, HAL_BOARD_IO_SHT_SDA_PIN) #define halMcuWaitUs McuWaitUs #define NOP() asm("NOP") //------------------------------------------------------------------- // LOCAL FUNCTIONS //------------------------------------------------------------------- static void McuWaitUs2(uint16 usec); void McuWaitUs2(uint16 usec) { usec >>= 1; while (usec--) { NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); NOP(); //NOP(); } } //------------------------------------------------------------------- // LOCAL FUNCTIONS //------------------------------------------------------------------- static void M2_I2cStart(void); void M2_I2cStart(void)//在SCL保持高电平期间，SDA由高变低，为起始信号 { HAL_E2PROM_SCL_SET(); //SCL=1 HAL_E2PROM_SDA_SET(); //SDA=1 McuWaitUs2(2); HAL_E2PROM_SDA_CLR(); //SDA=0 McuWaitUs2(2); HAL_E2PROM_SCL_CLR(); //SCL=0 McuWaitUs2(2); } //------------------------------------------------------------------- static void M2_I2cStop(void); void M2_I2cStop(void)//在SCL保持高电平期间，SDA由低变高，为停止信号 { HAL_E2PROM_SCL_SET(); //SCL=1 McuWaitUs2(2); HAL_E2PROM_SDA_CLR(); //SDA=0 McuWaitUs2(2); HAL_E2PROM_SDA_SET(); //SDA=1 McuWaitUs2(2); HAL_E2PROM_SCL_CLR(); //SCL=0 McuWaitUs2(2); } //------------------------------------------------------------------- static void M2_I2cAck(void); void M2_I2cAck(void)//当SDA=0时产生应答信号 { HAL_E2PROM_SCL_SET(); McuWaitUs2(2); HAL_E2PROM_SDA_CLR(); McuWaitUs2(2); HAL_E2PROM_SCL_CLR(); McuWaitUs2(2); } //------------------------------------------------------------------- static void M2_I2cNack(void); void M2_I2cNack(void)//当SDA=1时产生非应答信号 { HAL_E2PROM_SCL_SET(); McuWaitUs2(2); HAL_E2PROM_SDA_SET(); McuWaitUs2(2); HAL_E2PROM_SCL_CLR(); McuWaitUs2(2); } //------------------------------------------------------------------- static void M2_I2cWrite(uint8 dat); void M2_I2cWrite(uint8 dat)//在传送数据时，数据线保持稳定不能有跳变 { uint8 i; for (i = 0; i < 8; i++) { if (dat &0x80) { HAL_E2PROM_SDA_SET(); } else { HAL_E2PROM_SDA_CLR(); } HAL_E2PROM_SCL_SET();//当时钟线为高电平(SCL=1)时开始传送数据 dat = dat << 1; McuWaitUs2(2); HAL_E2PROM_SCL_CLR();//传送完后释放总线（SCL=0） McuWaitUs2(2); } } //------------------------------------------------------------------- static uint8 M2_I2cRead(void); uint8 M2_I2cRead(void) { uint8 res = 0; uint8 cnt; HAL_E2PROM_SDA_SET();//在读数据之前，把数据线拉高（datesheet上有介绍）,然后把数据线端口对CPU设置成输入端口 HAL_E2PROM_SDA_DIR_IN(); McuWaitUs2(2); for (cnt = 0; cnt < 8; cnt++) { HAL_E2PROM_SCL_SET(); res <<= 1; if (HAL_E2PROM_SDA_VAL())//cpu获取SDA端口上的值 { res |= 0x01; } McuWaitUs2(2); HAL_E2PROM_SCL_CLR(); McuWaitUs2(2); } HAL_E2PROM_SDA_DIR_OUT();//cpu获取完一个字节后，再将SDA端口设置成输出，且置高此端口 return res; } //------------------------------------------------------------------- // GLOBAL FUNCTIONS //------------------------------------------------------------------- static void M2_Init(void); void M2_Init(void)//初始化 SDA=1、SCL=1 { HAL_E2PROM_SDA_DIR_OUT(); MCU_IO_OUTPUT(HAL_BOARD_IO_E2PROM_SCL_PORT, HAL_BOARD_IO_E2PROM_SCL_PIN,1); } //------------------------------------------------------------------- static void M2_WriteEEPROM(uint8 addr, uint8 ch); void M2_WriteEEPROM(uint8 addr, uint8 ch)//往EEPROM里写数据（先写地址，在写数据） { M2_I2cStart(); M2_I2cWrite(0x70);//写器件地址，对于AT24C02来说，高四位固定为1010,后三位没有意义，最后一位为0时写，为1时读 M2_I2cAck(); M2_I2cWrite(addr); M2_I2cAck(); M2_I2cWrite(ch); //data M2_I2cAck(); M2_I2cStop(); // halMcuWaitMs(5); } //------------------------------------------------------------------- static uint8 M3_ReadEEPROM(uint8 addr); uint8 M3_ReadEEPROM(uint8 addr) { uint8 res; M2_I2cStart(); M2_I2cWrite(0x70); //器件设置为写状态 M2_I2cAck(); M2_I2cWrite(addr); M2_I2cAck(); M2_I2cStart(); M2_I2cWrite(0x71); //器件设置为写状态 M2_I2cAck(); res = M2_I2cRead(); M2_I2cNack(); M2_I2cStop(); return res; } /****************************************************************************** * 名称 BMA_Pooling * 功能 读取bma020的X,Y Z的重力加速度值 * 入口参数 (int16 *BMA_X_Value,int16 *BMA_Y_Value,int16 *BMA_Z_Value) *BMA_X_Value：X的重力加速度值存放地址 *BMA_Y_Value：Y的重力加速度值存放地址 *BMA_Z_Value：Z的重力加速度值存放地址 加速度值为16位有符号数，分辨率为 2/512 (g), g=9.8m/s * 出口参数 无 *****************************************************************************/ void BMA_Pooling(int16 *BMA_X_Value,int16 *BMA_Y_Value,int16 *BMA_Z_Value) { uint16 BMA_XM_Value,BMA_YM_Value,BMA_ZM_Value; uint16 BMA_XL_Value,BMA_YL_Value,BMA_ZL_Value; int16 value; M2_Init(); BMA_XL_Value = M3_ReadEEPROM(0x02); BMA_XM_Value = M3_ReadEEPROM(0x03); BMA_YL_Value = M3_ReadEEPROM(0x04); BMA_YM_Value = M3_ReadEEPROM(0x05); BMA_ZL_Value = M3_ReadEEPROM(0x06); BMA_ZM_Value = M3_ReadEEPROM(0x07); value = (BMA_XM_Value << 8) | ((BMA_XL_Value&0xc0)); *BMA_X_Value= value/64; value = (BMA_YM_Value << 8) | ((BMA_YL_Value&0xc0)); *BMA_Y_Value= value/64; value = (BMA_ZM_Value << 8) | ((BMA_ZL_Value&0xc0)); *BMA_Z_Value= value/64; }