{"id":14383,"date":"2018-08-06T12:01:34","date_gmt":"2018-08-06T16:01:34","guid":{"rendered":"http:\/\/embedded-lab.com\/blog\/?p=14383"},"modified":"2023-09-06T02:56:18","modified_gmt":"2023-09-06T06:56:18","slug":"getting-started-nuvoton-8-bit-microcontrollers-coding-part-3","status":"publish","type":"post","link":"https:\/\/embedded-lab.com\/blog\/getting-started-nuvoton-8-bit-microcontrollers-coding-part-3\/","title":{"rendered":"Getting Started with Nuvoton 8-bit Microcontrollers \u2013 Coding Part 3"},"content":{"rendered":"

This post is a continuation of the previous post on Nuvoton N76E003 microcontroller\u00a0here<\/a>.<\/p>\n

\"s-l1600\"<\/a><\/p>\n

<\/p>\n

Communication Peripheral Overview <\/span><\/h1>\n

N76E003 packs basic serial communication peripherals for I2C, SPI and UART. These interfaces enable us to interface external EEPROM and flash memories, real-time clocks (RTC), sensors, etc.<\/p>\n

\"Comm<\/a><\/p>\n

N76E003 has two hardware UARTs, one SPI and one I2C peripheral. The UART interfaces can be further expanded to implement RS-485 and RS-422 communication protocols. With ordinary GPIOs and optionally with hardware timers we can implement software-based UART, SPI and I2C too. However, software methods are slow and resource-hungry. Software-based approach is, on the other hand, needed when we have to interface devices that don\u2019t use any of these communication topologies. For example, the one-wire protocol used by DHT series relative humidity and temperature sensors needs to be implemented by using an ordinary GPIO pin. Same goes for typical text and graphical LCDs.<\/p>\n

\"N76E003<\/a><\/p>\n

Note that there is a conflict between UART1 and alternative I2C pins. There are also similar conflicts with other hardware peripherals like PWMs, ADCs, etc since N76E003 packs lots of stuff in such a small form-factor. Every single GPIO pin is precious. Try to keep things with default GPIO pins in order to reduce conflicts with other hardware peripherals, coding and to maximize effective use of GPIOs. Likewise bear in mind that timers have also such conflicts as they are used to implement both hardware-based delays and the UART peripherals. You have to know for sure what you are doing, what do you want and with which stuffs you wish to accomplish your task.<\/p>\n

<\/p>\n

Serial Communication – UART<\/span><\/h1>\n

To date serial communication (UART) is perhaps the simplest and widely used form of communication in use. UART block is only block available in most microcontrollers that can be easily interfaced with a computer or a phone. Most communication modules like Bluetooth, Wi-Fi, GSM modems, GPS modules, etc are interfaced using UART. It has incredible range and is also the backbone of other communication methods like RS-485, RS-422, etc.<\/p>\n

\"HMC1022\"<\/a><\/p>\n

To learn more about UART visit the following link:<\/p>\n

https:\/\/learn.mikroe.com\/uart-serial-communication<\/a><\/p>\n

Code<\/span><\/h2>\n

HMC1022.h<\/strong><\/h3>\n
#define Get_Angular_Measurement\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0x31<\/span><\/pre>\n
#define Start_Calibration\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0xC0\u00a0<\/span><\/pre>\n
#define End_Calibration\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a00xC1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
#define Set_Magnetic_Declination_High_Byte\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a00x03\u00a0\u00a0<\/span><\/pre>\n
#define Set_Magnetic_Declination_Low_Byte\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a00x04<\/span><\/pre>\n
<\/pre>\n
\u00a0<\/p>\n
#define no_of_data_bytes_returned\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a00x08<\/span><\/pre>\n
<\/pre>\n
\u00a0<\/p>\n
#define calibration_LED\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0P15<\/span><\/pre>\n
<\/pre>\n
\u00a0<\/p>\n
<\/pre>\n
void read_heading(void);<\/span><\/pre>\n
void calibrate_compass(void);\u00a0<\/span><\/pre>\n
void factory_reset(void);<\/span><\/pre>\n
void set_declination_angle(unsigned long angle);<\/span><\/pre>\n
HMC1022.c<\/strong><\/h3>\n
#include \"N76E003.h\"<\/span><\/pre>\n
#include \"SFR_Macro.h\"<\/span><\/pre>\n
#include \"Function_define.h\"<\/span><\/pre>\n
#include \"Common.h\"<\/span><\/pre>\n
#include \"Delay.h\"<\/span><\/pre>\n
#include \"soft_delay.h\"<\/span><\/pre>\n
#include \"HMC1022.h\"<\/span><\/pre>\n
<\/pre>\n
unsigned char done = 0;<\/span><\/pre>\n
unsigned char data_bytes[no_of_data_bytes_returned] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};<\/span><\/pre>\n
<\/pre>\n
<\/pre>\n
void read_heading(void)<\/span><\/pre>\n
{\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 unsigned char s = 0;\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 unsigned long CRC = 0;<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 Send_Data_To_UART1(Get_Angular_Measurement);\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 for(s = 0; s < no_of_data_bytes_returned; s++)<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 {\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 data_bytes[s] = Receive_Data_From_UART1();<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(s < (no_of_data_bytes_returned - 1))\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CRC += data_bytes[s];<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 CRC = (CRC & 0xFF);<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 if(CRC == data_bytes[7])<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 {\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 done = 1;<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
void calibrate_compass(void)<\/span><\/pre>\n
{<\/span><\/pre>\n
\u00a0unsigned char s = 0x00;\u00a0\u00a0 \u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0Send_Data_To_UART1(Start_Calibration);<\/span><\/pre>\n
<\/pre>\n
\u00a0for(s = 0; s < 60; s++)<\/span><\/pre>\n
\u00a0{<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 calibration_LED = 1;\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 delay_ms(100);<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 calibration_LED = 0;<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 delay_ms(900);<\/span><\/pre>\n
\u00a0}\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0for(s = 0; s < 60; s++)\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0{<\/span><\/pre>\n
\u00a0\u00a0 \u00a0\u00a0calibration_LED = 1;\u00a0 \u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 delay_ms(400);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 calibration_LED = 0;<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 delay_ms(600);<\/span><\/pre>\n
\u00a0}\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0Send_Data_To_UART1(End_Calibration);<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
void factory_reset(void)<\/span><\/pre>\n
{<\/span><\/pre>\n
\u00a0Send_Data_To_UART1(0xA0);<\/span><\/pre>\n
\u00a0Send_Data_To_UART1(0xAA);<\/span><\/pre>\n
\u00a0Send_Data_To_UART1(0xA5);\u00a0<\/span><\/pre>\n
\u00a0Send_Data_To_UART1(0xC5);<\/span><\/pre>\n
}\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
<\/pre>\n
void set_declination_angle(unsigned long angle)<\/span><\/pre>\n
{<\/span><\/pre>\n
\u00a0unsigned long hb = 0;<\/span><\/pre>\n
\u00a0unsigned char lb = 0;<\/span><\/pre>\n
<\/pre>\n
\u00a0lb = (angle & 0x00FF);\u00a0\u00a0\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0hb = (angle & 0xFF00);<\/span><\/pre>\n
\u00a0hb >>= 8;\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0Send_Data_To_UART1(Set_Magnetic_Declination_High_Byte);\u00a0\u00a0 \u00a0<\/span><\/pre>\n
\u00a0Send_Data_To_UART1(hb);<\/span><\/pre>\n
<\/pre>\n
\u00a0Send_Data_To_UART1(Set_Magnetic_Declination_Low_Byte);<\/span><\/pre>\n
\u00a0Send_Data_To_UART1(lb);<\/span><\/pre>\n
}<\/span><\/pre>\n
main.c<\/strong><\/h3>\n
#include \"N76E003.h\"<\/span><\/pre>\n
#include \"SFR_Macro.h\"<\/span><\/pre>\n
#include \"Function_define.h\"<\/span><\/pre>\n
#include \"Common.h\"<\/span><\/pre>\n
#include \"Delay.h\"<\/span><\/pre>\n
#include \"soft_delay.h\"<\/span><\/pre>\n
#include \"LCD_2_Wire.h\"<\/span><\/pre>\n
#include \"HMC1022.h\"<\/span><\/pre>\n
<\/pre>\n
const unsigned char symbol[8] =<\/span><\/pre>\n
{<\/span><\/pre>\n
\u00a0\u00a0 0x00, 0x06, 0x09, 0x09, 0x06, 0x00, 0x00, 0x00<\/span><\/pre>\n
};<\/span><\/pre>\n
<\/pre>\n
extern unsigned char done;<\/span><\/pre>\n
extern unsigned char data_bytes[no_of_data_bytes_returned];<\/span><\/pre>\n
<\/pre>\n
void setup(void);<\/span><\/pre>\n
void lcd_symbol(void);<\/span><\/pre>\n
<\/pre>\n
void main(void)<\/span><\/pre>\n
{<\/span><\/pre>\n
\u00a0 setup();<\/span><\/pre>\n
<\/pre>\n
\u00a0 while(1)<\/span><\/pre>\n
\u00a0 {<\/span><\/pre>\n
\u00a0\u00a0\u00a0 read_heading();<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0 if(done)<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 {<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto(6, 1);<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar(data_bytes[2]);<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto(7, 1);<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar(data_bytes[3]);<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto(8, 1);<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar(data_bytes[4]);<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto(9, 1);<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar('.');<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_goto(10, 1);<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 LCD_putchar(data_bytes[6]);<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 done = 0;<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 }<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 P15 = ~P15;<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 delay_ms(200);<\/span><\/pre>\n
\u00a0 };<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
void setup(void)<\/span><\/pre>\n
{<\/span><\/pre>\n
\u00a0 P15_PushPull_Mode;<\/span><\/pre>\n
<\/pre>\n
\u00a0 LCD_init();<\/span><\/pre>\n
\u00a0 LCD_clear_home();<\/span><\/pre>\n
\u00a0 lcd_symbol();<\/span><\/pre>\n
\u00a0 LCD_goto(3, 0);<\/span><\/pre>\n
\u00a0 LCD_putstr(\"Heading\u00a0 N\");<\/span><\/pre>\n
\u00a0 LCD_goto(11, 0);<\/span><\/pre>\n
\u00a0 LCD_send(0, DAT);<\/span><\/pre>\n
<\/pre>\n
\u00a0 InitialUART1_Timer3(9600);<\/span><\/pre>\n
}<\/span><\/pre>\n
<\/pre>\n
void lcd_symbol(void)\u00a0<\/span><\/pre>\n
{<\/span><\/pre>\n
\u00a0 unsigned char s = 0;\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0 LCD_send(0x40, CMD);<\/span><\/pre>\n
<\/pre>\n
\u00a0 for(s = 0; s < 8; s++)<\/span><\/pre>\n
\u00a0 {<\/span><\/pre>\n
\u00a0\u00a0 LCD_send(symbol[s], DAT);<\/span><\/pre>\n
\u00a0 }<\/span><\/pre>\n
<\/pre>\n
\u00a0 LCD_send(0x80, CMD);<\/span><\/pre>\n
}<\/span><\/pre>\n
Schematic<\/span><\/h2>\n
\"UART<\/a><\/p>\n
Explanation<\/span><\/h2>\n
The following are the commands that HMC1022 acknowledges when sent via UART:<\/p>\n
\"HMC1022<\/a><\/p>\n
HMC1022 gives heading data when it is requested. The highlighted command is that command.<\/p>\n
Once requested it sends out a string of characters that carry heading information. The followings are the response package and its details:<\/p>\n
\"HMC1022<\/a><\/p>\n
From the above info, it is clear that HMC1022 will return 8 bytes when requested for heading. Out of these we need bytes 2, 3,4 and 6. The rest can be ignored for simplicity.<\/p>\n
Data from HM1022 is received by the following function:<\/p>\n
void read_heading(void)<\/span><\/pre>\n
{\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 unsigned char s = 0;\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 unsigned long CRC = 0;<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 Send_Data_To_UART1(Get_Angular_Measurement);\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 for(s = 0; s < no_of_data_bytes_returned; s++)<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 {\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 data_bytes[s] = Receive_Data_From_UART1();<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(s < (no_of_data_bytes_returned - 1))\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 CRC += data_bytes[s];<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 CRC = (CRC & 0xFF);<\/span><\/pre>\n
<\/pre>\n
\u00a0\u00a0\u00a0\u00a0 if(CRC == data_bytes[7])<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 {\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 done = 1;<\/span><\/pre>\n
\u00a0\u00a0\u00a0\u00a0 }\u00a0\u00a0\u00a0\u00a0<\/span><\/pre>\n
}<\/span><\/pre>\n
Note that the function Send_Data_To_UART1<\/em><\/strong> and Receive_Data_From_UART1<\/em><\/strong> are BSP functions. Likewise, InitialUART1_Timer3(9600)<\/em><\/strong> function is also a BSP function that initiates UART1 with Timer 3. As with ADC, BSP functions for UART are enough for basic setup. Try to use Timer 3 as it remains mostly free. If you need more control over the UART, you can manually configure the registers.<\/p>\n
In the main, the received bytes containing heading info are displayed.<\/p>\n
Demo<\/span><\/h2>\n
\"UART\"<\/a><\/p>\n