Gd32f303 firmware library development (10) -- dual ADC polling mode scanning multiple channels

summary

Main configuration in this chapter , double ADC Polling mode scans multiple channels , Print through serial port .
Consult the manual to know ,PA9、PA10 It is a serial port 0 Output and input ports of .
Consult the manual to know ,PA9、PA10 It is a serial port 0 Output and input ports of . need GD The samples can be applied for group addition ：615061293 .

Video teaching

GD32F303 Firmware library development （10）---- double ADC Polling mode scans multiple channels

https://www.bilibili.com/video/BV1N94y1D7Yh/

csdn Course

The course is more detailed .
https://download.csdn.net/course/detail/37144

Hardware preparation

Here we are 1 Block development board for verification , Namely GD32303C_START Development board .

keil To configure

microlib Highly optimized to make the code small . Its function is better than the default C Library less , And don't have some ISO C characteristic . Some library functions also run slowly , If you want to use printf(), Must be turned on .

Enable serial port

  /*  Can make GPI0A, use PA9、PA10 It is a serial port  */
    rcu_periph_clock_enable(RCU_GPIOA);

    /* Enable serial port 0 The clock of  */
    rcu_periph_clock_enable(RCU_USART0);

    /* To configure USARTx_Tx(PA9) Push pull output for reuse */
    gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);
 
    /* To configure USARTx_RxPA9) Enter... For the float  */
    gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_10);

    /* USART  To configure  */
    usart_deinit(USART0);// Reset serial port 0
    usart_baudrate_set(USART0, 115200U);// Set the serial port 0 The baud rate of is 115200
    usart_word_length_set(USART0, USART_WL_8BIT);      	//  Frame data word length 
		usart_stop_bit_set(USART0, USART_STB_1BIT);      	 	//  Stop bit 1 position 
    usart_parity_config(USART0, USART_PM_NONE);       	//  No parity bit 
    usart_receive_config(USART0, USART_RECEIVE_ENABLE);// Enable the receiver 
    usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);// Enable the transmitter 
    usart_enable(USART0);// Can make USART

Serial port redirection

/* retarget the C library printf function to the USART */
int fputc(int ch, FILE *f)
{
    
    usart_data_transmit(USART0, (uint8_t)ch);
    while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));
    return ch;
}

The serial port can be used after resetting printf Print .

ADC Channel settings

ADC0 initialization

///************* Clock configuration ******************/

    /* Can make GPIOA The clock  */
    rcu_periph_clock_enable(RCU_GPIOA);
    /* Can make ADC The clock  */
    rcu_periph_clock_enable(RCU_ADC0);
    /*  To configure ADC rate  */
    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV8);

ADC0 To configure

/*------------------ADC GPIO To configure ------------------*/
//  Must be analog input 
    gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_MAX, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2);

/*------------------ADC Working mode configuration ------------------*/
		//  Set up adc Working in independent mode 
		adc_mode_config(ADC_MODE_FREE);
		//  Scan mode for multi-channel 
		// adc_special_function_config(ADC0, ADC_SCAN_MODE, ENABLE);
		//  Continuous conversion mode for single channel 
// adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, ENABLE); 


		//  Result conversion right alignment 
		adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);
		//  Switching channels 1 individual 
		adc_channel_length_config(ADC0, ADC_REGULAR_CHANNEL, 3);

    /* ADC regular channel config */
    adc_regular_channel_config(ADC0, 0, ADC_CHANNEL_0, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(ADC0, 1, ADC_CHANNEL_1, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(ADC0, 2, ADC_CHANNEL_2, ADC_SAMPLETIME_55POINT5);


		//  No external trigger conversion , Just open the software 
		adc_external_trigger_source_config(ADC0, ADC_REGULAR_CHANNEL, ADC0_1_2_EXTTRIG_REGULAR_NONE);
		adc_external_trigger_config(ADC0, ADC_REGULAR_CHANNEL, ENABLE);
    
		//  Can make ADC
		adc_enable(ADC0);
		delay_1ms(1);                                                   //  wait for 1ms
		//  Can make ADC calibration 
		adc_calibration_enable(ADC0);

ADC1 initialization

/************* Clock configuration ******************/

    /* Can make GPIOA The clock  */
    rcu_periph_clock_enable(RCU_GPIOB);
    /* Can make ADC The clock  */
    rcu_periph_clock_enable(RCU_ADC1);
    /*  To configure ADC rate  */
    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV8);	

ADC1 To configure

/*------------------ADC GPIO To configure ------------------*/
//  Must be analog input 
    gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_MAX, GPIO_PIN_7);
    gpio_init(GPIOB, GPIO_MODE_AIN, GPIO_OSPEED_MAX, GPIO_PIN_0 | GPIO_PIN_1);
/*------------------ADC Working mode configuration ------------------*/
		//  Set up adc Working in independent mode 
		adc_mode_config(ADC_MODE_FREE);
		//  Scan mode for multi-channel 
		// adc_special_function_config(ADC0, ADC_SCAN_MODE, ENABLE);
		//  Continuous conversion mode for single channel 
// adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, ENABLE); 


		//  Result conversion right alignment 
		adc_data_alignment_config(ADC1, ADC_DATAALIGN_RIGHT);
		//  Switching channels 1 individual 
		adc_channel_length_config(ADC1, ADC_REGULAR_CHANNEL, 3);

    /* ADC regular channel config */
    adc_regular_channel_config(ADC1, 0, ADC_CHANNEL_7, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(ADC1, 1, ADC_CHANNEL_8, ADC_SAMPLETIME_55POINT5);
    adc_regular_channel_config(ADC1, 2, ADC_CHANNEL_9, ADC_SAMPLETIME_55POINT5);


		//  No external trigger conversion , Just open the software 
		adc_external_trigger_source_config(ADC1, ADC_REGULAR_CHANNEL, ADC0_1_2_EXTTRIG_REGULAR_NONE);
		adc_external_trigger_config(ADC1, ADC_REGULAR_CHANNEL, ENABLE);
    
		//  Can make ADC
		adc_enable(ADC1);
		delay_1ms(1);                                                   //  wait for 1ms
		//  Can make ADC calibration 
		adc_calibration_enable(ADC1);

ADC Data collection

uint16_t  get_adc(uint32_t adc_periph , uint8_t adc_channel)
{
    
/*  Configure regular channel collection */
    adc_regular_channel_config(adc_periph, 0, adc_channel, ADC_SAMPLETIME_55POINT5);
		//  Because there is no external trigger , So use software to trigger ADC transformation 
		adc_software_trigger_enable(adc_periph, ADC_REGULAR_CHANNEL);   
				
		while(!adc_flag_get(adc_periph, ADC_FLAG_EOC));                       //  Wait for sampling to complete 
		adc_flag_clear(adc_periph, ADC_FLAG_EOC);                             //  Clear end flag 
				
		return  adc_regular_data_read(adc_periph);                         //  Read ADC data 
}

Data collection

    while (1){
    
        
		uint16_t adc0Value0 = 0;
		uint16_t adc0Value1 = 0;
		uint16_t adc0Value2 = 0;
	
		adc0Value0=get_adc(ADC0 ,ADC_CHANNEL_0);
		adc0Value1=get_adc(ADC0 ,ADC_CHANNEL_1);
		adc0Value2=get_adc(ADC0 ,ADC_CHANNEL_2);


	printf("\nadc0_IN0(PA0)=%4.0d, voltage =%1.4f",adc0Value0,adc0Value0*3.3f/4095);
	printf("\nadc0_IN1(PA1)=%4.0d, voltage =%1.4f",adc0Value1,adc0Value1*3.3f/4095);
	printf("\nadc0_IN2(PA2)=%4.0d, voltage =%1.4f",adc0Value2,adc0Value2*3.3f/4095);
			
		uint16_t adc1Value0 = 0;
		uint16_t adc1Value1 = 0;
		uint16_t adc1Value2 = 0;
		
		adc1Value0=get_adc(ADC1 ,ADC_CHANNEL_7);
		adc1Value1=get_adc(ADC1 ,ADC_CHANNEL_8);
		adc1Value2=get_adc(ADC1 ,ADC_CHANNEL_9);

	printf("\nadc1_IN7(PA7)=%4.0d, voltage =%1.4f",adc1Value0,adc1Value0*3.3f/4095);
	printf("\nadc1_IN8(PB0)=%4.0d, voltage =%1.4f",adc1Value1,adc1Value1*3.3f/4095);
	printf("\nadc1_IN9(PB1)=%4.0d, voltage =%1.4f",adc1Value2,adc1Value2*3.3f/4095);
	delay_1ms(1000);					
    }

test result

Input a fixed voltage for testing .

The test results are as follows .

Last

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