RA8P1 Titan Board RGB Usage Instructions
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Introduction
This example is the first and simplest example in the SDK, similar to the “Hello World” program that programmers encounter as their first program. The main function of this example is to make the onboard RGB-LED blink periodically.
Hardware Description
As shown in the diagram above, the Titan Board provides three user LEDs: LED_R (RED), LED_B (BLUE), and LED_G (GREEN). The BLUE LED corresponds to pin P012 on the MCU. To turn on the LED, a low level signal is output from the MCU pin, and to turn it off, a high level signal is output.
The positions of the LEDs on the development board are shown in the diagram below:
Software Description
The source code for this example is located in /projects/Titan_basic_blink_led. The MCU pin definitions for the RGB LEDs and the RGB control logic can be found insrc/hal_entry.c.
/* Configure LED pins */
#define LED_PIN_R BSP_IO_PORT_00_PIN_13
#define LED_PIN_B BSP_IO_PORT_00_PIN_12
#define LED_PIN_G BSP_IO_PORT_06_PIN_13
/* Define the LED on/off level */
#define LED_ON (0)
#define LED_OFF (1)
/* Define eight groups of LED flash tables whose order is R B G */
static const rt_uint8_t _blink_tab[][3] =
{
{LED_OFF, LED_OFF, LED_OFF},
{LED_ON, LED_OFF, LED_OFF},
{LED_OFF, LED_ON, LED_OFF},
{LED_OFF, LED_OFF, LED_ON},
{LED_ON, LED_OFF, LED_ON},
{LED_ON, LED_ON, LED_OFF},
{LED_OFF, LED_ON, LED_ON},
{LED_ON, LED_ON, LED_ON},
};
void hal_entry(void)
{
rt_kprintf("\nHello RT-Thread!\n");
rt_kprintf("==================================================\n");
rt_kprintf("This example project is a RGB flicker routine!\n\n");
rt_kprintf("==================================================\n");
unsigned int count = 0;
unsigned int group_num = sizeof(_blink_tab)/sizeof(_blink_tab[0]);
unsigned int group_current;
/* Set the RGB lamp pin to output mode */
rt_pin_mode(LED_PIN_R, PIN_MODE_OUTPUT);
rt_pin_mode(LED_PIN_G, PIN_MODE_OUTPUT);
rt_pin_mode(LED_PIN_B, PIN_MODE_OUTPUT);
rt_pin_write(LED_PIN_R, LED_OFF);
rt_pin_write(LED_PIN_G, LED_OFF);
rt_pin_write(LED_PIN_B, LED_OFF);
do
{
/* Get the group number */
group_current = count % group_num;
/* Control RGB LEDs */
rt_pin_write(LED_PIN_R, _blink_tab[group_current][0]);
rt_pin_write(LED_PIN_B, _blink_tab[group_current][1]);
rt_pin_write(LED_PIN_G, _blink_tab[group_current][2]);
/* Output LOG information */
LOG_D("group: %d | red led [%-3.3s] | | blue led [%-3.3s] | | green led [%-3.3s]",
group_current,
_blink_tab[group_current][0] == LED_ON ? "ON" : "OFF",
_blink_tab[group_current][1] == LED_ON ? "ON" : "OFF",
_blink_tab[group_current][2] == LED_ON ? "ON" : "OFF");
count++;
/* Delay for a short time */
rt_thread_mdelay(500);
}while(count > 0);
}
Compilation & Download
RT-Thread Studio: In RT-Thread Studio’s package manager, download the Titan Board resource package, create a new project, and compile it.
After compilation, connect the development board’s JLink interface to the PC and download the firmware to the development board.
Run Effect
After pressing the reset button to restart the development board, observe the actual effect of the RGB-LED on the development board. When the program is running normally, the RGB LEDs will change periodically.
At this point, you can also open the default serial port of the development board using a terminal tool on the PC, with the baud rate set to 115200N. The board’s runtime log information will be output in real-time.
\ | /
- RT - Thread Operating System
/ | \ 5.2.0 build Jul 30 2025 13:29:07
2006 - 2024 Copyright by RT-Thread team
Hello RT-Thread!
==================================================
This example project is an RGB flicker routine!
==================================================
[D/main] group: 0 | red led [OFF] | | blue led [OFF] | | green led [OFF]
[D/main] group: 1 | red led [ON ] | | blue led [OFF] | | green led [OFF]
[D/main] group: 2 | red led [OFF] | | blue led [ON ] | | green led [OFF]
[D/main] group: 3 | red led [OFF] | | blue led [OFF] | | green led [ON ]
[D/main] group: 4 | red led [ON ] | | blue led [OFF] | | green led [ON ]
[D/main] group: 5 | red led [ON ] | | blue led [ON ] | | green led [OFF]
[D/main] group: 6 | red led [OFF] | | blue led [ON ] | | green led [ON ]
[D/main] group: 7 | red led [ON ] | | blue led [ON ] | | green led [ON ]