自己整理的STM32代码

1、用户可通过多个预分频器配置ahb、高速apb(apb2)和低速apb(apb1)域的频率。ahb和apb2域的最大频率是72mhz。apb1域的最大允许频率是36mhz。rcc通过ahb时钟8分频后供给cortex系统定时器的外部时钟。通过对systick控制与状态寄存器的设置，可选择上述时钟或cortex ahb时钟作为systick时钟。adc时钟由高速apb2时钟经2、4、6或8分频后获得。定时器时钟频率是其所在apb总线频率的两倍。然而，如果相应的apb预分频系数是1，定时器的时钟频率与所在apb总线频率一致。fclk是cortex-m3的自由运行时钟。详情见arm的cortex-m3

2、技术参考手册。定时器计算公式：(1+tim_prescaler )/72m)*(1+tim_period )=(1+7199)/72m)*(1+9999)=1秒 定时器初始化程序 pwm计算公式：输出频率=时钟/（arr+1） 占空比=ccrx/arr x 100%void inittimer2_tim(void) tim_timebaseinittypedef tim_initstructure; nvic_inittypedef nvic_initstructure; nvic_initstructure.nvic_irqchannel = tim2_irqchannel; nvic_in

3、itstructure.nvic_irqchannelpreemptionpriority = 2; nvic_initstructure.nvic_irqchannelsubpriority = 1; nvic_initstructure.nvic_irqchannelcmd = enable; nvic_init(&nvic_initstructure); /配置时钟 rcc_apb1periphclockcmd(rcc_apb1periph_tim2, enable); tim_cmd(tim2, disable); tim_initstructure.tim_period = 3600

4、; /设置自动装载寄存器，4ms tim_initstructure.tim_countermode = tim_countermode_up; /向上计数 tim_initstructure.tim_prescaler = 79; /预分频 tim_initstructure.tim_clockdivision = tim_ckd_div1; /输入内部时钟频率是否倍频 /tim_initstructure.tim_repetitioncounter=0; tim_timebaseinit(tim2, &tim_initstructure); tim_itconfig(tim2, tim_i

5、t_update, enable); /开定时中断 tim_cmd(tim2, enable); /使能timer2 usart口初始化程序#include all.h/#define send_mode_dma/dma发送方式开关/#define usart1_use#define usart3_use#define usart1_rate 4800#define usart2_rate 4800#define usart3_rate 4800static void inithw_usart(void);/*初始化部分* *初始化硬件包括： *rcc初始化 *gpio初始化 *nvic初始化

6、 *配置初始化：包括使能、传输模式等 *变量初始化： *发送和接收缓存区初始化 */static void inithw_usart(void) usart_inittypedef usart_initstructure; gpio_inittypedef gpio_initstructure; nvic_inittypedef nvic_initstructure;#ifdef usart2_use /配置485收发控制io（默认接收，低电平） gpio_initstructure.gpio_pin = gpio_pin_0; gpio_initstructure.gpio_speed =

7、gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_out_pp; gpio_init(gpioa, &gpio_initstructure); gpio_resetbits(gpioa, gpio_pin_0); /使能时钟 rcc_apb1periphclockcmd(rcc_apb1periph_usart2, enable); /中断优先级 nvic_initstructure.nvic_irqchannel = usart2_irqchannel; nvic_initstructure.nvic_irqchannelp

8、reemptionpriority = 0; nvic_initstructure.nvic_irqchannelsubpriority = 0; nvic_initstructure.nvic_irqchannelcmd = enable; nvic_init(&nvic_initstructure); /配置接收管脚pa3 gpio_initstructure.gpio_pin = gpio_pin_3; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_in

9、_floating; gpio_init(gpioa, &gpio_initstructure); /配置发送管脚pa2 gpio_initstructure.gpio_pin = gpio_pin_2; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_af_pp; gpio_init(gpioa, &gpio_initstructure); /波特率、字长、停止位、奇偶校验位、硬件流控制、异步串口为默认（被屏蔽字设置） usart_initstructure.

10、usart_baudrate = usart2_rate; usart_initstructure.usart_wordlength = usart_wordlength_8b; usart_initstructure.usart_stopbits = usart_stopbits_1; usart_initstructure.usart_parity = usart_parity_no; usart_initstructure.usart_hardwareflowcontrol = usart_hardwareflowcontrol_none; usart_initstructure.usa

11、rt_mode = usart_mode_rx | usart_mode_tx; usart_init(usart2, &usart_initstructure); /开接收中断 usart_itconfig(usart2, usart_it_rxne, enable); /#ifdef send_mode_dma /发送启用dma模式 / usart_dmacmd(usart2, usart_dmareq_tx, enable); #else /开发送中断 usart_itconfig(usart2, usart_it_tc, enable); /#endif /使能usart usart_

12、cmd(usart2, enable);#endif #ifdef usart3_use /使能时钟 rcc_apb1periphclockcmd(rcc_apb1periph_usart3, enable); /中断优先级 nvic_initstructure.nvic_irqchannel = usart3_irqchannel; nvic_initstructure.nvic_irqchannelpreemptionpriority = 0; nvic_initstructure.nvic_irqchannelsubpriority = 0; nvic_initstructure.nvi

13、c_irqchannelcmd = enable; nvic_init(&nvic_initstructure); /配置接收管脚pb11 gpio_initstructure.gpio_pin = gpio_pin_11; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_in_floating; gpio_init(gpiob, &gpio_initstructure); /配置发送管脚pb10 gpio_initstructure.gpio_pin = gp

14、io_pin_10; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_af_pp; gpio_init(gpiob, &gpio_initstructure); /波特率、字长、停止位、奇偶校验位、硬件流控制、异步串口为默认（被屏蔽字设置） usart_initstructure.usart_baudrate = usart3_rate; usart_initstructure.usart_wordlength = usart_wordlength_8b; us

15、art_initstructure.usart_stopbits = usart_stopbits_1; usart_initstructure.usart_parity = usart_parity_no; usart_initstructure.usart_hardwareflowcontrol = usart_hardwareflowcontrol_none; usart_initstructure.usart_mode = usart_mode_rx | usart_mode_tx; usart_init(usart3, &usart_initstructure); usart_cmd

16、(usart3, enable);#endif /-u16 k=0;void init_usart(void) /此函数在sys_cfg()中初始化 inithw_usart();int main(void) /系统初始化 sys_cfg(); g_carderrcode=init_sd(); /sd检测标志位，g_carderrcode=0表示sd卡正常 ，为g_carderrcode=1表示sd卡有问题 /*铁电检测程序*/ writedata_fram( us0, 0x1000, 10, null, 0); delay1us(10000); readdata_fram( us1, 0x1

17、000, 10,null, 0); delay1us(10000); readdata_fram( us1, 0x1000, 10,null, 0); /writesendbuf_usart(us0, 10, 3); gpio_setbits(gpioe, gpio_pin_10 | gpio_pin_11 | gpio_pin_12 | gpio_pin_13 | gpio_pin_14 | gpio_pin_15); rddisplay_led(); /数码管显示函数 while(1) usart_senddata(usart3, 0xbb); k=usart_receivedata(us

18、art3); delay1us(10); k=0; 我用的是usart3，其余的usart口都一样，在网上的代码大多都不是很全，上述相关代码是我自己测试时编写的，拿过来就可以用，需要传输大量数据时自己做个函数就可以了。方便大家学习。stm32的spi配置程序（此程序只是个stm32的配置程序，没有接外围器件所以片选位可以用）static void inithw_spi(void) spi_inittypedef spi_initstructure; gpio_inittypedef gpio_initstructure; nvic_inittypedef nvic_initstructure;

19、#ifdef spi1_use /输出时钟 rcc_apb2periphclockcmd(rcc_apb2periph_gpioa | rcc_apb2periph_gpiob | rcc_apb2periph_spi1, enable); spi_cmd(spi1, disable); gpio_setbits(gpioa, gpio_pin_4); /中断优先级 nvic_initstructure.nvic_irqchannel = spi1_irqchannel; nvic_initstructure.nvic_irqchannelpreemptionpriority = 3; nvi

20、c_initstructure.nvic_irqchannelsubpriority = 2; nvic_initstructure.nvic_irqchannelcmd = enable; nvic_init(&nvic_initstructure); /配置片选 gpio_initstructure.gpio_pin = gpio_pin_4; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_out_pp; gpio_init(gpioa, &gpio_in

21、itstructure); /配置3线制io gpio_initstructure.gpio_pin = gpio_pin_5 | gpio_pin_6 | gpio_pin_7; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_af_pp; gpio_init(gpioa, &gpio_initstructure); /配置spi模式：主、双向、8位、模式0、软件片选（3线制）、18m波特率 spi_initstructure.spi_direction =

22、spi_direction_2lines_fullduplex; spi_initstructure.spi_mode = spi_mode_master; spi_initstructure.spi_datasize = spi_datasize_8b; spi_initstructure.spi_cpol = spi_cpol_low; spi_initstructure.spi_cpha = spi_cpha_1edge; spi_initstructure.spi_nss = spi_nss_soft; spi_initstructure.spi_baudrateprescaler =

23、 spi_baudrateprescaler_8; spi_initstructure.spi_firstbit = spi_firstbit_msb; spi_initstructure.spi_crcpolynomial = 7; spi_init(spi1, &spi_initstructure); /无效片选 gpio_setbits(gpioa, gpio_pin_4); /禁止crc spi_calculatecrc(spi1, disable); /开接收中断 /spi_itconfig(spi1, spi_it_rxne, enable); /使能spi spi_cmd(spi

24、1, enable);#endif #ifdef spi2_use /输出时钟 rcc_apb1periphclockcmd(rcc_apb1periph_spi2, enable); /中断优先级 nvic_initstructure.nvic_irqchannel = spi2_irqchannel; nvic_initstructure.nvic_irqchannelpreemptionpriority = 3; nvic_initstructure.nvic_irqchannelsubpriority = 3; nvic_initstructure.nvic_irqchannelcmd

25、 = enable; nvic_init(&nvic_initstructure); /配置片选 gpio_initstructure.gpio_pin = gpio_pin_12; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_out_pp; gpio_init(gpiob, &gpio_initstructure); /配置3线制io gpio_initstructure.gpio_pin = gpio_pin_13 | gpio_pin_14 | gpi

26、o_pin_15; gpio_initstructure.gpio_speed = gpio_speed_50mhz; gpio_initstructure.gpio_mode = gpio_mode_af_pp; gpio_init(gpiob, &gpio_initstructure); /配置spi模式：主、双向、8位、模式3、软件片选（3线制）、18m波特率 spi_initstructure.spi_direction = spi_direction_2lines_fullduplex; spi_initstructure.spi_mode = spi_mode_master; sp

27、i_initstructure.spi_datasize = spi_datasize_8b; spi_initstructure.spi_cpol = spi_cpol_low; spi_initstructure.spi_cpha = spi_cpha_1edge; spi_initstructure.spi_nss = spi_nss_soft; spi_initstructure.spi_baudrateprescaler = spi_baudrateprescaler_4; spi_initstructure.spi_firstbit = spi_firstbit_msb; spi_

28、initstructure.spi_crcpolynomial = 7; spi_init(spi2, &spi_initstructure); /片选 gpio_setbits(gpiob, gpio_pin_12); /禁止crc spi_calculatecrc(spi2, disable); /开接收中断 / spi_itconfig(spi2, spi_it_rxne, enable); /使能spi spi_cmd(spi2, enable);#endif pwm初始化/*/代码在pa1引脚上产生一个10k左右 50%占空比的方波输出/*/void tim_configuratio

29、n(void)tim_timebaseinittypedef tim_timebasesturcture;tim_ocinittypedef tim_ocinitstructure;gpio_inittypedef gpio_initstructure;/*开启gpioa时钟*/rcc_apb2periphclockcmd(rcc_apb2periph_gpioa ,enable);/*开启tim2时钟*/rcc_apb1periphclockcmd(rcc_apb1periph_tim2,enable);/*初始化pa1，tim2-ch2通道*/gpio_initstructure.gpio

30、_pin = gpio_pin_1;gpio_initstructure.gpio_mode = gpio_mode_af_pp;gpio_initstructure.gpio_speed = gpio_speed_50mhz;gpio_init(gpioa,&gpio_initstructure);/*tim2基本初始化*/tim_timebasesturcture.tim_period = 512; /*周期0ffff*/tim_timebasesturcture.tim_prescaler = 12; /*时钟分频*/tim_timebasesturcture.tim_clockdivi

31、sion = 0; /*时钟分割*/tim_timebasesturcture.tim_countermode = tim_countermode_up; /*模式*/tim_timebaseinit(tim2, &tim_timebasesturcture);/*pwm 通道 初始化*/tim_ocinitstructure.tim_ocmode = tim_ocmode_pwm1; /*工作状态*/tim_ocinitstructure.tim_outputstate = tim_outputstate_enable; /*设定为输出，需要pwm输出才需要这行代码*/tim_ocinits

32、tructure.tim_pulse = 256; /*占空长度 0 周期(max)*/tim_ocinitstructure.tim_ocpolarity = tim_ocpolarity_high; /*高电平*/tim_oc2init(tim2, &tim_ocinitstructure); /*通道初始化*/*开启tim2模块*/tim_cmd(tim2, enable);/*测温程序（内部adc）内部传感器采集误差比较大*/void adc_hardinit(void) adc_inittypedef adc_initstructure; rcc_apb2periphclockcmd

33、(rcc_apb2periph_adc1, enable); /* adc1 configuration -*/ adc_initstructure.adc_mode = adc_mode_independent; adc_initstructure.adc_scanconvmode = enable; adc_initstructure.adc_continuousconvmode = enable; adc_initstructure.adc_externaltrigconv = adc_externaltrigconv_none; adc_initstructure.adc_dataal

34、ign = adc_dataalign_right; adc_initstructure.adc_nbrofchannel = 1; adc_init(adc1, &adc_initstructure); /* adc1 regular channel14 configuration */ adc_regularchannelconfig(adc1, adc_channel_16, 1, adc_sampletime_239cycles5 ); /* enable adc1 */ adc_cmd(adc1, enable); /* enable adc1 reset calibaration

35、register */ adc_resetcalibration(adc1); /* check the end of adc1 reset calibration register */ while(adc_getresetcalibrationstatus(adc1); /* start adc1 calibaration */ adc_startcalibration(adc1); /* check the end of adc1 calibration */ while(adc_getcalibrationstatus(adc1);u16 adc_filter(void)u16 res

36、ult=0;u8 i;for(i=16;i0;i-) /delay2us(1); result += value;return result/16;/u8 adc_getchannel(u8 channel, u16* value) switch (channel) case 0x16: channel = adc_channel_16; adc_tempsensorvrefintcmd(enable); break; case 0x17: channel = adc_channel_17; break; default: channel = adc_channel_16; break; /*

37、 adc1 regular channel14 configuration */ adc_regularchannelconfig(adc1, channel, 1, adc_sampletime_239cycles5); adc_softwarestartconvcmd(adc1, enable); delay2us(100); *value = adc_getconversionvalue(adc1); if(channel = 0x16) adc_tempsensorvrefintcmd(disable); return 0; vs8 temperature=0;temperature_

38、detect() u16 adc; u16 wd; if(!adc_getchannel(0x16, &value) /*supported temperature range: 40 to 125 degrees precision: 1.5 c */ /*temperature (in c) = (v25 - vsense) / avg_slope + 25. avg_slope = 4.3 mv/c v25 = 1.43 v注：这里应用的全为典型值，在datasheet上可以查取。 */ adc=adc_filter(); wd = (1.43 - adc*3.3/4096)*1000/

39、4.35 + 25; delay2us(10); /*stm32的18b20程序*/#include #include all.h/* private define -*/ /rom操作指令/读rom#define read_rom 0x33/匹配rom#define match_rom 0x55/跳过rom#define skip_rom 0xcc/搜索rom#define search_rom 0xf0/告警搜索#define alarm_search 0xec /存储器操作指令/写暂存存储器#define write_scratchpad 0x4e/读暂存存储器#define read_

40、scratchpad 0xbe/复制暂存存储器#define copy_scratchpad 0x48/温度变换#define convert_temperature 0x44/重新调出#define recall_eprom 0xb8/读电源#define read_power_supply 0xb4 /* private macro -*/ u16 ds18b20_pin = (16); /接ds18b20的引脚/#define ds18b20_pin (1odr = (gpiod-odr & ds18b20_pin) | (x ? ds18b20_pin : 0) /具体使用那个端口修改

41、此处#define read_dq gpio_readinputdatabit(gpiod,ds18b20_pin) /也要修改 void us_delay (u16 us) while(us-);void gpioint(void) /pass gpio_inittypedef gpio_initstructure; rcc_apb2periphclockcmd(rcc_apb2periph_gpiod,enable); /打开时钟 gpio_initstructure.gpio_pin = gpio_pin_6; /选择引脚 gpio_initstructure.gpio_mode = g

42、pio_mode_out_od; gpio_initstructure.gpio_speed = gpio_speed_2mhz; gpio_init(gpiod,&gpio_initstructure); /* function name : dqreset* description :送一个复位脉冲(最少保持480s的低电平信号)，然后释放总线，mcu进入接收状态，ds1820 在探测到引脚上的上升沿后，延时1560s后，ds1820发出存在脉冲（60240s的低电平信号）。* input : none* output : none* return : none*/u8 dqreset(void) /pass u8 temp; dq(1); us_delay(10