【东软载波ESF0654 PDS开发板活动】ADC及PWM调光测试 今天测试了板子的ADC功能及PWM调光功能，主要实现了根据ADC采集的板载电位器的值来使用PWM功能调节导光板的亮度。 ES32F0654LT集成的支持 1 路模数转换器（ADC0）。ADC（Analog to Digital Convertor）是 12 位分辨率的逐次逼近型模数转换器。它具有多达 19 个复用通道，可测量从管脚输入的 16 个外部信号、3 个内部信号。这些通道的模数转换可在单次、连续、扫描或不连续采样模式下进 行。ADC 的结果存储在一个左对齐或右对齐的 16 位数据寄存器中。 ESF0654 PDS开发板ADC接在PB0接口，PB0为ADC0的14通道。 IO引脚配置如下： - static void adc_pin_init(void)
- {
- /* Initialize ADC pin */
- gpio_init_t x;
- /* Initialize PB0 pin */
- x.mode = GPIO_MODE_INPUT;
- x.odos = GPIO_PUSH_PULL;
- x.pupd = GPIO_PUSH_UP;
- x.odrv = GPIO_OUT_DRIVE_NORMAL;
- x.flt = GPIO_FILTER_DISABLE;
- x.type = GPIO_TYPE_TTL;
- x.func = GPIO_FUNC_0;
- ald_gpio_init(GPIOB, GPIO_PIN_0, &x);
- return;
- }
ADC0的配置如下： - void adc_init(void)
- {
- /* clear lpuart_handle_t structure */
- memset(&h_adc, 0x0, sizeof(adc_handle_t));
- /* clear adc_nch_conf_t structure */
- memset(®_config, 0x0, sizeof(adc_nch_conf_t));
- adc_pin_init();
- /* Initialize adc */
- h_adc.perh = ADC0;
- h_adc.init.data_align = ADC_DATAALIGN_RIGHT;
- h_adc.init.scan_mode = DISABLE;
- h_adc.init.cont_mode = DISABLE;
- h_adc.init.nch_len = ADC_NCH_LEN_1;
- h_adc.init.disc_mode = ADC_ALL_DISABLE;
- h_adc.init.disc_nbr = ADC_DISC_NBR_1;
- h_adc.init.conv_res = ADC_CONV_RES_10;
- h_adc.init.clk_div = ADC_CKDIV_128;
- h_adc.init.neg_ref = ADC_NEG_REF_VSS;
- h_adc.init.pos_ref = ADC_POS_REF_VDD;
- ald_adc_init(&h_adc);
- /* Initialize regular convert channel */
- reg_config.channel = ADC_CHANNEL_14;
- reg_config.rank = ADC_NCH_RANK_1;
- reg_config.samp_time = ADC_SAMPLETIME_4;
- ald_adc_normal_channel_config(&h_adc, ®_config);
- return;
- }
ES32F0654LT集成通用定时器（GP16C2T）包含一个 16 位自动重载计数器，该计数器由可配置的预分频器驱动。支持 2 路通用定时器（GP16C2T0，GP16C2T1） 。GP16C2T 包含 2 个独立通道。 通用定时器（GP16C2T） 的用途广泛，可测量信号脉冲长度（输入捕获）或输出脉冲波形 （比较输出、PWM 及带死区时间插入的互补 PWM）。 本程序中使用了TIM3的1通道，对应引脚为PC6。 IO引脚初始化如下，对应IO的功能3： - static void tim3_pin_init(void)
- {
- gpio_init_t GPIO_InitStructure;
- /* Initialize tim0 ch1 pin */
- GPIO_InitStructure.mode = GPIO_MODE_OUTPUT;
- GPIO_InitStructure.odos = GPIO_PUSH_PULL;
- GPIO_InitStructure.pupd = GPIO_PUSH_UP;
- GPIO_InitStructure.odrv = GPIO_OUT_DRIVE_NORMAL;
- GPIO_InitStructure.flt = GPIO_FILTER_DISABLE;
- GPIO_InitStructure.type = GPIO_TYPE_TTL;
- GPIO_InitStructure.func = GPIO_FUNC_3;
- ald_gpio_init(GPIOC, GPIO_PIN_6, &GPIO_InitStructure)；
- }
TIM3初始化程序如下： - void tim3_init(timer_handle_t *tim_h, timer_oc_init_t *tim_ocinit, timer_clock_config_t *tim_clock)
- {
- /* Initialize pin */
- tim3_pin_init();
- /* Initialize TIM3 */
- tim_h->perh = GP16C2T1;
- tim_h->init.prescaler = 0;
- tim_h->init.mode = TIMER_CNT_MODE_UP;
- tim_h->init.period = (uint32_t)(255 - 1);
- tim_h->init.clk_div = TIMER_CLOCK_DIV1;
- tim_h->init.re_cnt = 0;
- ald_timer_pwm_init(tim_h);
- /* Initialize clock source */
- tim_clock->source = TIMER_SRC_INTER;
- ald_timer_config_clock_source(tim_h, tim_clock);
- /* Common configuration for all channels */
- tim_ocinit->oc_mode = TIMER_OC_MODE_PWM1;
- tim_ocinit->oc_polarity = TIMER_OC_POLARITY_HIGH;
- tim_ocinit->oc_fast_en = DISABLE;
- tim_ocinit->ocn_polarity = TIMER_OCN_POLARITY_HIGH;
- tim_ocinit->ocn_idle = TIMER_OCN_IDLE_RESET;
- tim_ocinit->oc_idle = TIMER_OC_IDLE_RESET;
- /* Set the pulse value for channel 1 */
- tim_ocinit->pulse = (uint32_t)(255 * 20 / 100);
- ald_timer_oc_config_channel(tim_h, tim_ocinit, TIMER_CHANNEL_1);
- /* Set the pulse value for channel 2 */
- tim_ocinit->pulse = (uint32_t)(255 * 50 / 100);
- ald_timer_oc_config_channel(tim_h, tim_ocinit, TIMER_CHANNEL_2);
- /* Start input pwm from tim2/3 channel 1 */
- ald_timer_oc_start(tim_h, TIMER_CHANNEL_1);
- }
主程序实现了根据ADC采用进行PWM调节控制外部导光板的亮度： - /* ADC测试 */
- value = adc_average();
- sprintf((char *)tx_buf, "ADC_Value: %d \n", value);
- ald_uart_send(&h_uart, tx_buf, sizeof("ADC_Value: %d \n"), 1000);
-
- /* TIM3 PWM测试 */
- duty = value/32.72;
- if(duty <= 1)
- duty = 1;
- ald_timer_pwm_set_duty(&tim3.tim_h, TIMER_CHANNEL_1, (uint16_t)duty);
实现现象如下：
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