SSD1306 using I2C in RA2L1

Question

Hi, Is there any library for RA2L1MCU's SSD1306 OLED using I2C interface, If yes please provide the link, Thanks.

Sergey (SWF) · Answer

Maybe wrong initialization. Have you changed the display dimensions in the Adafruit_SSD1306.h file? 
 
 You need to uncomment "#define SSD1306_128_64" and comment the "#define SSD1306_64_32". 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

OK, seems like I've found it. 
 In your project in the oled_display function you use this code: 
 
 And in the library I used this code looks different 
 
 So in your code it sends only one line while in my code it sends the whole display 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

Hello Nikhil Kumar, 
 You need to assign the value I2C_MASTER_EVENT_ABORTED to the i2cMaster_event variable before the transmission because otherwise it keeps I2C_MASTER_EVENT_TX_COMPLETE and the loop finishes instantly. 
 Please check my function i2c_write from the above C++ library I provided. 
 void Adafruit_SSD1306::i2c_write(uint8_t* buf, uint16_t len)
{
 fsp_err_t err;
 uint32_t timeout_ms = I2C_TRANSACTION_BUSY_DELAY;

 /* Send data to I2C slave */
 g_i2c_callback_event = I2C_MASTER_EVENT_ABORTED;

 err = R_IIC_MASTER_Write(&g_i2c_master0_ctrl, buf, len, false);
 if (err == FSP_SUCCESS)
 {
 /* Since there is nothing else to do, block until Callback triggers*/
 while ((I2C_MASTER_EVENT_TX_COMPLETE != g_i2c_callback_event) && timeout_ms)
 {
 R_BSP_SoftwareDelay(1U, BSP_DELAY_UNITS_MILLISECONDS);
 timeout_ms--;;
 }
 if (I2C_MASTER_EVENT_ABORTED == g_i2c_callback_event)
 {
 __BKPT(0);
 }
 }
} 
 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

I frankly don't see any reason for such behavior unless your MCU is reset for some reason in the middle of data transfer. Check the behavior with the step-by-step execution. Check the content of the "buffer"array after the "clearbuffer" function to make sure it's really clear. 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

Hello Nikhil, 
 Have you increased the heap size of the project? The sprintf function uses the heap for its operation, and if it's size is 0 then the data may be corrupted. 
 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

Try these files. I've changed them a bit for you, and now they seem to work, at least on my side. 
 Kind regards, 
 Sergey 
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 src.zip

Sergey (SWF) · Answer

Hello izrtn, 
 I've made such library for RA2A1 MCU but I'm pretty sure it will work for RA2L1 as well. Here is the tutorial about it, and the link is at the end of it. https://www.circuitbread.com/tutorials/renesas-ra-8-porting-the-arduino-oled-library-to-the-renesas-ra-family 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

ssd1306.zip 
 This is the port of the C library for RL78 MCU. You will just need to change some functions in the Adafruit_SSD1306.c file. Also please pay attention to the resolution of the display. In my program it's 64x32. 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

Hello Nikhil Kumar, 
 If you use the display on the board you don't need any pull-up resistors as they already are attached on this board. Also please refer to this tutorial https://www.circuitbread.com/tutorials/renesas-ra-8-porting-the-arduino-oled-library-to-the-renesas-ra-family . Even if you use C instead of C++ you still can use the same functions to work with the I2C as in this tutorial. 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

Hello Nikhil Kumar, 
 You can eliminate this loop, but in this case you will need to check the i2cMaster_event variable every time before attempting to send the data, and start transmission only if it is I2C_MASTER_EVENT_TX_COMPLETE. 
 So it's easier to use this loop. Moreover, if the bus works fine, the delay caused by it will be very insignificant. 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

Hello Nikhil Kumar, 
 Sorry for the late reply. I've remade the code, so it sends all the buffer at a time, and you don't need to wait while the transmission is done. With such an approach you may don't even need the DTC. Just make sure you don't update the LCD very often, as it's not safe now because we don't wait while the transmission is done. 
 ssd1306_oled.zip 
 Kind regards, 
 Sergey 
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SSD1306 using I2C in RA2L1

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