STM8单片机ADC、Timer、USART寄存器直接操作实用例程

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STM8 单片机ADC、Timer、USART实用例程

这是一个我花了较长时间摸索出来的STM8L－051的例程，它控制LED灯，Timer2定时100us进入中断，软件启动ADC，采样10 次后取平均，将结果通过UASART发送至PC机，在超级终端上显示的实用程序，因其内存极小，不能用printf等函数，因此对于想用这款资源极少的MCU的开发者来说，读这篇文章会大大节约你的研发时间。有不会的问题请发邮件johnwa@21cn.com。 #include #include \#include \

#define LED_GPIO_PORT GPIOA

#define LED_GPIO_PINS GPIO_Pin_2 | GPIO_Pin_3

/* Private function prototypes -----------------------------------------------*/ #define ADC1_DR_ADDRESS ((uint16_t)0x5344) #define BUFFER_SIZE ((uint8_t) 0x02) #define BUFFER_ADDRESS ((uint16_t)(&Buffer)) #define ASCII_NUM_0 ((uint8_t) 48)

#define ADC_RATIO ((uint16_t) 806) /*ADC_RATIO = ( 3.3 * 1000 * 1000)/4095*/ #define SampleADC ((uint8_t) 0x0A)

/* Private variables ---------------------------------------------------------*/ uint8_t Buffer[4] = {0, 0, 0, 0}; uint16_t ADCdata = 0; uint16_t ADCvalue = 0; unsigned char LED =1; unsigned char c = 8;

uint16_t acode = 1234; //43 \

void Delay(__IO uint16_t nCount) {

/* Decrement nCount value */ while (nCount != 0) { nCount--; } }

//int putchar(int c) //{

// while ((USART1_SR&0x80)==0x00); // UART2_sendchar((u8)c); // return (c); //}

static void CLK_Config(void) {

/* Select HSI as system clock source */ CLK_SYSCLKSourceSwitchCmd(ENABLE);

CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSI);

/*High speed external clock prescaler: 1*/

CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);

while (CLK_GetSYSCLKSource() != CLK_SYSCLKSource_HSI) {}

/* Enable ADC1 clock */

CLK_PeripheralClockConfig(CLK_Peripheral_ADC1, ENABLE);

/* Enable DMA1 clock */

// CLK_PeripheralClockConfig(CLK_Peripheral_DMA1, ENABLE);

/* Enable TIM2 clock */

CLK_PeripheralClockConfig(CLK_Peripheral_TIM2, ENABLE);

CLK_PeripheralClockConfig(CLK_Peripheral_USART1, ENABLE); }

static void GPIO_Config(void) {

PC_DDR = 0X20; PC_CR1 = 0X20; PA_DDR = 0X0C; PA_CR1 = 0X0C; }

static void USART1_Config(void) {

// ADCvalue = USART1_DR; USART1_BRR2 = 0x03;

USART1_BRR1 = 0x68; //16M/9600=683

USART1_CR2 = 0x0C; //Transmitter & receiver enable }

static void ADC_Config(void) {

ADC1_CR2 = 0x22; //risign edge, softwae start, sampling time 16 ADC clock ADC1_SQR3 = 0x80; //ADC = 15channel

ADC1_TRIGR1 = 0x10; //use internal ref,sampling time 16 ADC clock for Ref RI_ASCR1 = 0x00; }

void TIM2_Config(void) {

TIM2_PSCR = 0x07; // 应是16，但只能置三位，所以是111 fCK_PSC / 2(PSC[2:0]). // TIM2_PSCRL = 0x3F; // PSCR=0x1F3F，f=8M/(0x1F3F+1)=1000Hz，每个计数周期1ms TIM2_ARRH = 0x00; // 自动重载寄存器ARR=0x01F4=500

TIM2_ARRL = 0x18; // 24X4us=96us 每记数500次产生一次中断，即500ms TIM2_IER = 0x01; // 允许更新中断

TIM2_CR1 = 0x05; // 计数器使能，开始计数,只允许更新中断请求 }

void Delay (uint16_t nCount);

/* Private functions ---------------------------------------------------------*/ //#pragma vector = ADC1_EOC_vector //__interrupt void ADC1_EOC(void) //{

// ADCdata = ADC_GetConversionValue(ADC1); // }

#pragma vector =TIM2_OVR_UIF_vector __interrupt void TIM2_OVR_UIF(void) {

asm(\

static uint8_t measurements = SampleADC; static uint32_t accumulator = 0; uint32_t average = 0; uint16_t factor10 = 1000; int8_t i ; ADCdata = 0;

TIM2_SR1 = 0x00; //Clear UIF ADC1_SR = 0x00; //Clear EOC

ADC1_CR1 = 0x03; // EOC interrupt unable, software set start, ADC enable // while (!(ADC1_SR & 0x01));

/*最后一位不是1，结果就是全零，结果为False,!则是True,循环下去；若是1，则跳出。*/

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