Jlink ARM OB

   最近上淘寶買了一個很便宜的Jlink ARM OB, 剛好中間遇到過年, 所以等了快三週才收到,
簡單測試了一下真的是蠻方便使用的, 唯一美中不足的大概就是沒有把RESET Pin拉出來吧.

STM32F373/383 I2C Master Driver

1. 底下是stm32f373/stm32f383 I2C Master test code的簡易測試範例, 主要是利用I2C去
    對L3GD20做I2C R/W的測試.


2. Main Loop:

• Include I2C.h.

• Init I2C.

• Enable L3GD20 Normal Mode by I2C.(I2C Write)

• Get L3GD20 Chip ID.(I2C Read)

3. 測試波形如下:

• I2C Write:

• I2C Read:

4. I2C Driver Download Link:

• I2C.c

• I2C.h

bin2h tool

1. 有時候在執行一些bin file的操作時, 會很希望把bin file轉成hex buffer來操作, 剛好最近看到有
    一個Tool就可以做到這件事情, 先趕快把它記錄下來.

2. 先到官方網站上去下載最新版Tool.
    http://www.deadnode.org/sw/bin2h/

3. 接著將下載下來的bin2h.exe和希望轉換成hex buffer的bin file放在同一個目錄底下.
    ex: 希望將SysTick_Example.bin轉換成hex buffer, 並存在 systick.h檔案裡面.

4. 開啟DOS Command模式, 到存放bin2h.exe和bin file檔案的路徑底下, 輸入以下command:

    bin2h.exe -c -z <bin file name> output file name

    ex:  bin2h.exe -c -z <SysTick_Example.bin> systick.h

5. 轉換成功後, .h檔案會自己產生, 此時可以先用ultraedit檢查一下是否有轉換成功, 使用ultraedit
    開啟SysTick_Example.bin後, 可以看到右下方有顯示bin file的大小, 以本範例來看是1560bytes.

6. 於是我們也利用ultraedit來打開systick.h看看, 打開後就會看到如下所示的hex buffer,
    可以直接複製到project裡面使用, 而buffer size則在最下面.

7. 可以看到buffer size = 1560, 與我們從ultraedit上面觀察到的長度相同.

8. bin2h.exe and test files download link:

    bin2h.exe

    SysTick_Example.bin

    systick.h

Street Fighter V 開箱

巧虎藍光光碟機微開箱

    家裡之前都是用PS3來播巧虎的, 只是沒想到居然遇到了死亡黃燈, 於是只好再買一台PS4來繼續播放巧虎....T_T.

nRF51x22 Simple KeyScan

1. Test Schematic: (KEY1 = GPIO25)

2. Button.c
--------------------------------------------------------------------------------------------------------------------

#include "Button.h"

uint16_t  DebounceKeyCnt = 0;
uint8_t   KeyValue = 0; 
uint8_t   KeyState = 0;

void Button_Init(void)
{
 nrf_gpio_pin_dir_set(Button_GPIO_Pin,NRF_GPIO_PIN_DIR_INPUT);   //configurate pin direction to input
 nrf_gpio_cfg_input(Button_GPIO_Pin, NRF_GPIO_PIN_PULLUP); //pull-up
}

uint8_t KeyScan(void)
{
 KeyValue = nrf_gpio_pin_read(Button_GPIO_Pin);
 
 #ifdef high_active
  KeyValue = KeyValue;    //active high
 #endif
 
 #ifdef low_active
  KeyValue = !(KeyValue); //active low
 #endif
  
 if(KeyValue >= 1)
 {
  DebounceKeyCnt++;
 
                if(DebounceKeyCnt >= 5)
                {
   DebounceKeyCnt = 0;  
   KeyState = 1;
                }    
 }
 else
 {
  DebounceKeyCnt = 0;
  KeyState = 0;   
 } 
        
 return(KeyState);
}

3. Button.h
---------------------------------------------------------------------------------------------------------------------

#include "nrf_drv_gpiote.h"

#define Button_GPIO_Pin 25

#if 0
 #define high_active
#else
 #define low_active
#endif

void Button_Init(void);
uint8_t KeyScan(void);

nRF51x22 Simple Timer Code

1. 定義一個固定時間觸發的Timer.


2. 只需要Timer Init 和 Timer Handler這兩個function就可以用了.

Timer Init:
-------------------------------------------------------------------------------------------------------------------------

void Timer_Init(int32_t deltatime)  
{
    
    NRF_TIMER2->BITMODE     = TIMER_BITMODE_BITMODE_16Bit; //Set counter to 16 bit resolution
    NRF_TIMER2->MODE        = TIMER_MODE_MODE_Timer;
    NRF_TIMER2->PRESCALER   = 9;               //16MHz/(2^9) = 16MHz/512 = 31250Hz = 32usec
    NRF_TIMER2->CC[2]       = (deltatime/32);            //250 = 8msec , 500 = 16msec
    NRF_TIMER2->INTENSET    = TIMER_INTENSET_COMPARE2_Enabled << TIMER_INTENSET_COMPARE2_Pos;
    NRF_TIMER2->SHORTS      = (TIMER_SHORTS_COMPARE1_CLEAR_Enabled << TIMER_SHORTS_COMPARE1_CLEAR_Pos);
                
    NVIC_ClearPendingIRQ(TIMER2_IRQn);
    NVIC_SetPriority(TIMER2_IRQn,3);
    NVIC_EnableIRQ(TIMER2_IRQn);  
    NRF_TIMER2->TASKS_START = 1; 
}

Timer Handler:
-------------------------------------------------------------------------------------------------------------------------

void TIMER2_IRQHandler(void)  
{
    if((NRF_TIMER2->EVENTS_COMPARE[2] == 1) && (NRF_TIMER2->INTENSET & TIMER_INTENSET_COMPARE2_Msk))
    {
 NRF_TIMER2->EVENTS_COMPARE[2] = 0;
   
 //nrf_gpio_pin_toggle(20);      //debug gpio
       
 NRF_TIMER2->TASKS_CLEAR = 1; 
    }
}

3. 假設需要定義一個固定每10msec會觸發的Timer, 可以在Init的時候帶入這樣的參數.     Timer_Init(10000);

nRF51x22 I2C Master Driver

1. 最近開始接觸nRF51x22系列的東西, 真的是有點小複雜, 因此就把最近弄好的一些東西先簡
    易備份在Blogger上, 以方便之後有需要的時候容易能馬上使用.

2. 使用I2C Master Driver之前, 必須要先include以下的c & h file, 才能正常使用, 檔名及路徑如
    下:

• 測試的版本皆是在nRF51_SDK_9.0.0_2e23562.zip這個sdk版本下進行測試的.

• twi_hw_master.c:
  \components\drivers_nrf\twi_master\incubated\

• twi_master.h:
  \components\drivers_nrf\twi_master\incubated\

• twi_master_config.h:
  \components\drivers_nrf\twi_master\incubated\config\

3. 接著就是使用底下的i2c.c & i2c.h 這兩個檔案就可以使用了.

i2c.c:
--------------------------------------------------------------------------------------------------------------------------

#include "i2c.h"

void I2C_Master_Init(void)
{
 twi_master_init();
}

int I2C_Write(uint8_t DeviceAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t NumByteToWrite)
{
   #define i2c_write_data_len 6
   uint8_t w2_data[i2c_write_data_len+1], i;

   w2_data[0] = RegAddr;
   for ( i = 0 ; i < NumByteToWrite ; i++ ) {
 w2_data[i +1] = pBuffer[i];  
   }

   if(twi_master_transfer(DeviceAddr,w2_data,NumByteToWrite+1,TWI_ISSUE_STOP) == false)
        return -1;

   return 0;
}

int I2C_Read(uint8_t DeviceAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t NumByteToRead)
{
 
   if(twi_master_transfer(DeviceAddr, &RegAddr, 1, TWI_DONT_ISSUE_STOP) == false)
 return -1;

   if(twi_master_transfer(DeviceAddr|TWI_READ_BIT, pBuffer, NumByteToRead, TWI_ISSUE_STOP) == false)
 return -1;
  
   return 0; 
}

i2c.h:
--------------------------------------------------------------------------------------------------------------------------

#include "twi_master.h"

void I2C_Master_Init(void);
int I2C_Write(uint8_t DeviceAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t NumByteToWrite);
int I2C_Read(uint8_t DeviceAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t NumByteToRead);

4. 調整i2c speed的地方在twi_master_init()裡面:

TWI_FREQUENCY_FREQUENCY_K400 = 400KHz
TWI_FREQUENCY_FREQUENCY_K250 = 250KHz
TWI_FREQUENCY_FREQUENCY_K100 = 100KHz

5. 調整i2c gpio pin的地方在twi_master_config.h:

    SCL = 1U = GPIO1.

    SDA = 3U = GPIO3.