add bh1750 demo on tos_evb_aiot board

board/TencentOS_tiny_EVB_AIoT/BSP/Hardware/BH1750-IIC/bh1750_i2c_drv.c

@@ -0,0 +1,145 @@
+#include "bh1750_i2c_drv.h"
+
+#if defined(USE_ST_HAL)
+static void bh1750_i2c_init(void)
+{
+    // it will be called in main.
+    // MX_I2C1_Init();
+}
+
+static int bh1750_send_cmd(uint8_t cmd)
+{
+    return HAL_I2C_Master_Transmit(&BH1750_I2C_HANDLE, BH1750_ADDR_WRITE, &cmd, 1, 0xFFFF);
+}
+
+static int bh1750_read_dat(uint8_t* dat)
+{
+    return HAL_I2C_Master_Receive(&BH1750_I2C_HANDLE, BH1750_ADDR_READ, dat, 2, 0xFFFF);
+}
+
+#elif defined(USE_NXP_FSL)
+static void bh1750_i2c_init(void)
+{
+    lpi2c_master_config_t masterConfig;
+    
+    /*Clock setting for LPI2C */
+    CLOCK_SetMux(kCLOCK_Lpi2cMux, LPI2C_CLOCK_SOURCE_SELECT);
+    CLOCK_SetDiv(kCLOCK_Lpi2cDiv, LPI2C_CLOCK_SOURCE_DIVIDER);
+    
+    /*
+     * masterConfig.debugEnable = false;
+     * masterConfig.ignoreAck = false;
+     * masterConfig.pinConfig = kLPI2C_2PinOpenDrain;
+     * masterConfig.baudRate_Hz = 100000U;
+     * masterConfig.busIdleTimeout_ns = 0;
+     * masterConfig.pinLowTimeout_ns = 0;
+     * masterConfig.sdaGlitchFilterWidth_ns = 0;
+     * masterConfig.sclGlitchFilterWidth_ns = 0;
+     */
+    LPI2C_MasterGetDefaultConfig(&masterConfig);
+
+    /* Change the default baudrate configuration */
+    masterConfig.baudRate_Hz = LPI2C_BAUDRATE;
+
+    /* Initialize the LPI2C master peripheral */
+    LPI2C_MasterInit(BH1750_I2C_MASTER, &masterConfig, LPI2C_MASTER_CLOCK_FREQUENCY);
+}
+
+static int bh1750_send_cmd(uint8_t cmd)
+{
+    status_t reVal = kStatus_Fail;
+    
+    /* Send master blocking data to slave */
+    if (kStatus_Success != LPI2C_MasterStart(BH1750_I2C_MASTER, BH1750_DEVICE_ADDR_7BIT, kLPI2C_Write))
+    {
+        return -1;
+    }
+    
+    /* Check communicate with slave successful or not */
+    if (LPI2C_MasterGetStatusFlags(BH1750_I2C_MASTER) & kLPI2C_MasterNackDetectFlag)
+    {
+        return kStatus_LPI2C_Nak;
+    }
+
+    reVal = LPI2C_MasterSend(BH1750_I2C_MASTER, (uint8_t *)&cmd, 1);
+    if (reVal != kStatus_Success)
+    {
+        if (reVal == kStatus_LPI2C_Nak)
+        {
+            LPI2C_MasterStop(BH1750_I2C_MASTER);
+        }
+        return -1;
+    }
+
+    reVal = LPI2C_MasterStop(BH1750_I2C_MASTER);
+    if (reVal != kStatus_Success)
+    {
+        return -1;
+    }
+    
+    return 0;
+}
+
+static int bh1750_read_dat(uint8_t* dat)
+{
+    status_t reVal = kStatus_Fail;
+    
+    if (kStatus_Success != LPI2C_MasterStart(BH1750_I2C_MASTER, BH1750_DEVICE_ADDR_7BIT, kLPI2C_Read)) {
+        return -1;
+    }
+    
+    reVal = LPI2C_MasterReceive(BH1750_I2C_MASTER, dat, 2);
+    if (reVal != kStatus_Success)
+    {
+        if (reVal == kStatus_LPI2C_Nak)
+        {
+            LPI2C_MasterStop(BH1750_I2C_MASTER);
+        }
+        return -1;
+    }
+
+    reVal = LPI2C_MasterStop(BH1750_I2C_MASTER);
+    if (reVal != kStatus_Success)
+    {
+        return -1;
+    }
+    
+    return 0;
+}
+#endif /* USE_ST_HAL or USE_NXP_FSL */
+
+static uint16_t bh1750_dat2lux(uint8_t* dat)
+{
+    uint16_t lux = 0;
+    
+    lux = dat[0];
+    lux <<= 8;
+    lux += dat[1];
+    lux = (int)(lux / 1.2);
+	
+    return lux;
+}
+
+int bh1750_init(void)
+{
+    bh1750_i2c_init();
+    return 0;
+}
+
+int bh1750_start(bh1750_mode_t mode)
+{
+    return bh1750_send_cmd(mode);
+}
+
+int bh1750_read_lux(uint16_t *lux)
+{
+    uint8_t dat[2] = {0};
+    
+    if (bh1750_read_dat(dat) != 0) {
+        return -1;
+    }
+    
+    *lux = bh1750_dat2lux(dat);
+    
+    return 0;
+}

board/TencentOS_tiny_EVB_AIoT/BSP/Hardware/BH1750-IIC/bh1750_i2c_drv.h

@@ -0,0 +1,50 @@
+#ifndef	_BH1750_I2C_DRV_H_
+#define	_BH1750_I2C_DRV_H_
+
+//#define USE_ST_HAL
+#define USE_NXP_FSL
+
+#if defined(USE_ST_HAL)
+
+#include "stm32l4xx_hal.h"
+
+// address(7 bit) + read or write(1 bit)
+#define	BH1750_ADDR_WRITE	0x46
+#define	BH1750_ADDR_READ	0x47
+#define BH1750_I2C_HANDLE   hi2c1
+
+#elif defined(USE_NXP_FSL)
+
+#include "fsl_lpi2c.h"
+
+#define	BH1750_DEVICE_ADDR_7BIT     0x23
+#define BH1750_I2C_MASTER           LPI2C1
+/* Select USB1 PLL (480 MHz) as master lpi2c clock source */
+#define LPI2C_CLOCK_SOURCE_SELECT (0U)
+/* Clock divider for master lpi2c clock source */
+#define LPI2C_CLOCK_SOURCE_DIVIDER (5U)
+/* Get frequency of lpi2c clock */
+#define LPI2C_CLOCK_FREQUENCY ((CLOCK_GetFreq(kCLOCK_Usb1PllClk) / 8) / (LPI2C_CLOCK_SOURCE_DIVIDER + 1U))
+#define LPI2C_MASTER_CLOCK_FREQUENCY LPI2C_CLOCK_FREQUENCY
+#define LPI2C_BAUDRATE 100000U
+
+#endif /* USE_ST_HAL or USE_NXP_FSL */
+
+typedef enum
+{
+    POWER_OFF_CMD	=	0x00,	// Power off
+    POWER_ON_CMD	=	0x01,	// Power on
+    RESET_REGISTER	=	0x07,	// Reset digital register
+    CONT_H_MODE		=	0x10,	// Continuous high resolution mode, measurement time 120ms
+    CONT_H_MODE2	=	0x11,	// Continuous high resolution mode2, measurement time 120ms
+    CONT_L_MODE		=	0x13,	// Continuous low resolution mode, measurement time 16ms
+    ONCE_H_MODE		=	0x20,	// Once high resolution mode, measurement time 120ms
+    ONCE_H_MODE2	=	0x21,	// Once high resolution mode2, measurement time 120ms
+    ONCE_L_MODE		=	0x23	// Once low resolution mode2, measurement time 120ms
+} bh1750_mode_t;
+
+int bh1750_init(void);
+int bh1750_start(bh1750_mode_t mode);
+int bh1750_read_lux(uint16_t *lux);
+
+#endif