項(xiàng)目簡(jiǎn)介

此次項(xiàng)目主要是基于PSOC6 英飛凌 PSoC?62 with CAPSENSE? evaluation kit 實(shí)現(xiàn)OLED 顯示溫度、氣壓室內(nèi)信息。

整體框架如下：

1.通過板載的dap 和uart 進(jìn)行串口log 打印及程序刷寫
2.通過I2C 進(jìn)行BMP280 的驅(qū)動(dòng)
3.通過I2C 進(jìn)行oled SSD1306的顯示

實(shí)現(xiàn)步驟

1.rtt 中添加 軟件包

使能sensor 驅(qū)動(dòng) iic 驅(qū)動(dòng) uart驅(qū)動(dòng)

2.默認(rèn)的bmp280 包不能使用，由于使用最新的rt版本 不兼容，進(jìn)行驅(qū)動(dòng)層修改

#ifndef SENSOR_BS_BMP280_H__
#define SENSOR_BS_BMP280_H__
#include "drivers/sensor.h"
#include "bmp280.h"
#define BMP280_ADDR_DEFAULT BMP280_I2C_ADDR_SEC
#define BMP280_I2CBUS_NAME "i2c1"
int rt_hw_bmp280_init(const char *name, struct rt_sensor_config *cfg);
#endif
定義I2C bus名稱
定義BMP280 默認(rèn)地址
硬件初始化

static struct rt_sensor_ops sensor_ops =
{
_bmp280_fetch_data,
_bmp280_control
};
int rt_hw_bmp280_init(const char *name, struct rt_sensor_config *cfg)
{
int result;
rt_sensor_t sensor_pres = RT_NULL, sensor_temp = RT_NULL;
result = _rt_bmp280_init(&cfg->intf);
if (result != RT_EOK)
{
LOG_E("_rt_bmp280_init err code: %d", result);
return -RT_ERROR;
}
else
{
sensor_pres = rt_calloc(1, sizeof(struct rt_sensor_device));
if (sensor_pres == RT_NULL)
{
LOG_E("rt_calloc error");
return -RT_ERROR;
}
sensor_pres->info.type = RT_SENSOR_TYPE_BARO;
sensor_pres->info.vendor = RT_SENSOR_VENDOR_BOSCH;
sensor_pres->info.name = "bmp280_pres";
sensor_pres->info.unit = RT_SENSOR_UNIT_PA;
sensor_pres->info.intf_type = RT_SENSOR_INTF_I2C;
sensor_pres->info.scale.range_max = SENSOR_PRES_RANGE_MAX;
sensor_pres->info.scale.range_min = SENSOR_PRES_RANGE_MIN;
//sensor_pres->info.period_min = 0;
rt_memcpy(&sensor_pres->config, cfg, sizeof(struct rt_sensor_config));
sensor_pres->ops = &sensor_ops;
result = rt_hw_sensor_register(sensor_pres, name, RT_DEVICE_FLAG_RDWR, (void *)RT_NULL);
if (result != RT_EOK)
{
LOG_E("device register err code: %d", result);
goto __exit;
}
sensor_temp = rt_calloc(1, sizeof(struct rt_sensor_device));
if (sensor_temp == RT_NULL)
{
LOG_E("rt_calloc error");
goto __exit;
}
sensor_temp->info.type = RT_SENSOR_TYPE_TEMP;
sensor_temp->info.vendor = RT_SENSOR_VENDOR_BOSCH;
sensor_temp->info.name = "bmp280_temp";
sensor_temp->info.unit = RT_SENSOR_UNIT_CELSIUS;
sensor_temp->info.intf_type = RT_SENSOR_INTF_I2C;
sensor_temp->info.scale.range_max = SENSOR_TEMP_RANGE_MAX;
sensor_temp->info.scale.range_min = SENSOR_TEMP_RANGE_MIN;
//sensor_temp->info.period_min = 0;
rt_memcpy(&sensor_temp->config, cfg, sizeof(struct rt_sensor_config));
sensor_temp->ops = &sensor_ops;
result = rt_hw_sensor_register(sensor_temp, name, RT_DEVICE_FLAG_RDWR, RT_NULL);
if (result != RT_EOK)
{
LOG_E("device register err code: %d", result);
goto __exit;
}
}
LOG_I("bmp280_sensor init success");
return RT_EOK;
__exit:
if (sensor_pres)
rt_free(sensor_pres);
if (sensor_temp)
rt_free(sensor_temp);
return -RT_ERROR;
}
rt_sensor_info 結(jié)構(gòu)體改變了很多，需要根據(jù)sensor 驅(qū)動(dòng)進(jìn)行相應(yīng)的修改
設(shè)置 bmp 280 更新速度

static rt_err_t _bmp280_set_odr(rt_sensor_t sensor, rt_uint32_t args)
{
int8_t rslt;
struct bmp280_config conf;
if(args==1||args==2||args==4||args==8||args==16||args==2048||args==BMP280_ODR_2000_MS||args==BMP280_ODR_4000_MS)
{
rslt = bmp280_get_config(&conf, &bmp);
if(rslt!=BMP280_OK)
{
print_rslt(" bmp280_get_config status", rslt);
return -RT_ERROR;
}
switch(args)
{
case 1 : conf.odr = BMP280_ODR_1000_MS; break;
case 2 : conf.odr = BMP280_ODR_500_MS; break;
case 4 : conf.odr = BMP280_ODR_250_MS; break;
case 8 : conf.odr = BMP280_ODR_125_MS; break;
case 16 : conf.odr = BMP280_ODR_62_5_MS; break;
case 2048 : conf.odr = BMP280_ODR_0_5_MS; break;
case BMP280_ODR_2000_MS : conf.odr = BMP280_ODR_2000_MS; break;
case BMP280_ODR_4000_MS : conf.odr = BMP280_ODR_4000_MS; break;
default: return -RT_ERROR;
}
rslt = bmp280_set_config(&conf, &bmp);
if(rslt!=BMP280_OK)
{
print_rslt(" bmp280_set_config status", rslt);
return -RT_ERROR;
}
return RT_EOK;
}
else
{
// LOG_E("only 1,2,4,8,16,2048,BMP280_ODR_2000_MS,BMP280_ODR_4000_MS could set");
return -RT_ERROR;
}
}
最新版本的sensor control 去掉了好多控制，做了相應(yīng)的注釋

static rt_err_t _bmp280_control(struct rt_sensor_device *sensor, int cmd, void *args)
{
rt_err_t result = RT_EOK;
switch (cmd)
{
case RT_SENSOR_CTRL_GET_ID:
result = _bmp280_get_id(sensor,args);
break;
#if 0
case RT_SENSOR_CTRL_SET_RANGE:
result = -RT_ERROR;
break;
case RT_SENSOR_CTRL_SET_ODR:
result = _bmp280_set_odr(sensor,(rt_uint32_t)args & 0xffff);
break;
case RT_SENSOR_CTRL_SET_MODE:
break;
case RT_SENSOR_CTRL_SET_POWER:
result = _bmp280_set_POWER(sensor,(rt_uint32_t)args & 0xff);
break;
#endif
case RT_SENSOR_CTRL_SELF_TEST:
result = -RT_ERROR;
break;
default:
// LOG_E("only RT_SENSOR_CTRL_GET_ID,RT_SENSOR_CTRL_SET_POWER,RT_SENSOR_CTRL_SET_ODR could set");
return -RT_ERROR;
}
return result;
}
3.bmp280 app 初始化

#include
#include
#include
#include "sensor_bs_bmp280.h"
#define BMP_NAME "bmp280"
int bmp280_port(void)
{
struct rt_sensor_config cfg;
cfg.intf.dev_name = BMP280_I2CBUS_NAME;
rt_hw_bmp280_init("bmp280", &cfg);
return 0;
}
INIT_APP_EXPORT(bmp280_port);

上電log 打印可以看到device 已經(jīng)注冊(cè)成功

4.oled 顯示驅(qū)動(dòng)

oled 顯示通過u8g2進(jìn)行驅(qū)動(dòng),這里參考ssd1306 I2C 初始化過程 代碼如下：

u8g2_t u8g2;
// Initialization
u8g2_Setup_ssd1306_i2c_128x64_noname_f( &u8g2, U8G2_R0, u8x8_byte_sw_i2c, u8x8_gpio_and_delay_rtthread);
u8x8_SetPin(u8g2_GetU8x8(&u8g2), U8X8_PIN_I2C_CLOCK, OLED_I2C_PIN_SCL);
u8x8_SetPin(u8g2_GetU8x8(&u8g2), U8X8_PIN_I2C_DATA, OLED_I2C_PIN_SDA);

顯示初始化前 ，先尋找驅(qū)動(dòng)

rt_device_t temp_dev =RT_NULL;
  rt_device_t baro_dev =RT_NULL;
  rt_size_t res =0;
  temp_dev = rt_device_find(BMP_TEMP);
  if(temp_dev == RT_NULL)
  {
      rt_kprintf("can not find bmp280 tempn");
      return ;
  }
  baro_dev = rt_device_find(BMP_BARO);
  if(temp_dev == RT_NULL)
  {
      rt_kprintf("can not find bmp280 baron");
      return ;
  }
  if (rt_device_open(temp_dev, RT_DEVICE_FLAG_RDWR) != RT_EOK) {
      rt_kprintf("open device failed!n");
      return;
  }
  if (rt_device_open(baro_dev, RT_DEVICE_FLAG_RDWR) != RT_EOK) {
      rt_kprintf("open device failed!n");
      return;
  }

然后顯示線程的主循環(huán)中按一定的間隔進(jìn)行sensor 數(shù)據(jù)讀取，然后更新顯示到oled 上

res = rt_device_read(temp_dev, 0, &temp_data, 1);
      if (res != 1) {
          rt_kprintf("read data failed!size is %dn", res);
          rt_device_close(temp_dev);
          return;
      }
      res = rt_device_read(baro_dev, 0, &baro_data, 1);
      if (res != 1) {
          rt_kprintf("read data failed!size is %dn", res);
          rt_device_close(baro_dev);
          return;
      }
      u8g2_ClearBuffer(&u8g2);
      u8g2_DrawStr(&u8g2, 12, 12, "psoc6 demo");
      temp_int =temp_data.data.temp;
      //sprintf(buf,"temp:%.2f C",temp_data.data.temp);
      sprintf(buf,"temp:%d.%d C",temp_int /10,temp_int %10);
      u8g2_DrawStr(&u8g2, 32, 40, buf);
      sprintf(buf,"baro:%.0fPa",baro_data.data.baro );
      u8g2_DrawStr(&u8g2, 32, 56, buf);
      u8g2_SendBuffer(&u8g2);
      rt_thread_mdelay(100);