This post was last edited by damiaa on 2024-3-13 23:59
[ST NUCLEO-U5A5ZJ-Q development board review] 8 serial port printing and clock
The clock is always an important peripheral in embedded devices. Many devices that interact with people need to use clocks, such as alarm clocks, watches, mobile phones, etc. Therefore, it is very necessary to be familiar with the peripheral processing of the clock.
Now let’s start the experiment in this area.
1. Open stm32cubeide and configure the clock
RCC configuration HSE and LSE external crystal
RTC selects Activate Clock Source and Activate Calendar
Then check the clock configuration (Clock Config) and select LSE
There are clocks and calendars, which can be configured here or set at runtime
If you add an alarm, some parameters of the alarm will appear below. You can configure them here or set them at runtime.
And there are alarm interruptions to choose from:
The 32.768 external clock is now connected to the RTC and the clock calendar is also configured.
2. Introduction to Generated Code
Select and save to generate the code.
In main.c, there is
Definition of Rtc structure handle
There is RTC initialization procedure
stm32u5xx_it.c has the addition of alarm interrupt
The RTC initialization program contains the clock calendar setting and alarm setting code, which can be copied and used directly.
3. Add code
Because alarm interrupt A is selected, if you want to handle this interrupt, you must add this callback function to the main program (if other interrupts are selected, you must add callback functions for other interrupts).
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
}
If alarm B or other interrupts are selected, the processing is similar.
Regarding the callback function, ST also provides a HAL_RTC_RegisterCallback to register your own callback function, but you also need to configure USE_HAL_RTC_REGISTER_CALLBACKS to 1. This is troublesome. It is better to use the callback function with the same name. In fact, other interrupts also have this operation, such as serial ports.
As for the time and calendar settings, they are already in the initialization and can be copied here.
How to read the time and calendar, we can find their prototypes in stm32u5xx_hal_rtc.c .
Finally, add code to the main program
- The time, date, alarm, etc. are set during initialization, so we won’t worry about that here.
- Do a serial port read command analysis:
getDT +0x0d (Enter)
- Then read out the date, time and week
- Add a read command parsing program to the callback function, and make a mark if there is a read command.
- When the main program finds a read flag, it reads the time, date, and week and sends them to the serial port.
- At the same time, turn on a green light to remind you
Add parsing command to void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
if((rx1_b[0] == 'g')&&(rx1_b[1] == 'e')&&(rx1_b[2] == 't')&&(rx1_b[3] == 'D')&&(rx1_b[4] == 'T')&&(rx1_b_index >=6))
{
setRTCflag=0x11;
}
Processing in the main program:
switch(setRTCflag)
{
case 0x03:
//setT 12 30 09
//setD 2 2 11 2024
//setA 23 32 00 00
if (HAL_RTC_SetTime(&hrtc, &sTime2, RTC_FORMAT_BCD) != HAL_OK)
{
Error_Handler();
}
break;
case 0x05:
if (HAL_RTC_SetDate(&hrtc, &sDate2, RTC_FORMAT_BCD) != HAL_OK)
{
Error_Handler();
}
break;
/** Enable the Alarm A*/
case 0x09:
if (HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm2, RTC_FORMAT_BCD) != HAL_OK)
{
Error_Handler();
}
break;
case 0x11:
if(HAL_RTC_GetTime(&hrtc, &sTime2, RTC_FORMAT_BIN) == HAL_OK)
{
char uart_buf[100]={0};
HAL_RTC_GetDate(&hrtc, &sDate2, RTC_FORMAT_BIN);
char str[25]={0};
switch(sDate2.WeekDay)
{
case 1:
sprintf(str,"WeekDay is MONDAY\n");
break;
case 2:
sprintf(str,"WeekDay is TUESDAY\n");
break;
case 3:
sprintf(str,"WeekDay is WEDNESDAY\n");
break;
case 4:
sprintf(str,"WeekDay is THURSDAY\n");
break;
case 5:
sprintf(str,"WeekDay is FRIDAY\n");
break;
case 6:
sprintf(str,"WeekDay is SATURDAY\n");
break;
case 7:
sprintf(str,"WeekDay is SUNDAY\n");
break;
}
sprintf(uart_buf,"Date is 20%2d-%02d-%02d \n Time is %02d : %02d : %02d \n %s\n ",sDate2.Year,sDate2.Month,sDate2.Date,sTime2.Hours,sTime2.Minutes,sTime2.Seconds,str);
HAL_UART_Transmit_IT(&huart1,(const uint8_t*)&uart_buf[0], 100);
HAL_GPIO_WritePin(LED_GREEN_GPIO_Port, LED_GREEN_Pin, GPIO_PIN_SET);
HAL_Delay(100);
HAL_GPIO_WritePin(LED_GREEN_GPIO_Port, LED_GREEN_Pin, GPIO_PIN_RESET);
}
break;
default:break;
}
setRTCflag =0;
Compile, download, debug, and verify experimentally:
The time setting part is in the initialization code, so I won't introduce it here. I'll report here first. Thank you
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