[fix] update for ref/sig/cnt with 1024 point per period in test example
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e6251f3f03
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@ -13,8 +13,10 @@
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#define DEBUG_UART_PIN (GPIO_Pin_6)
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#define DEBUG_UART_BAUDRATE (2 * 1000 * 1000)
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#define DEBUG_CH_RAW (0)
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#define DEBUG_CHAN_MAX (1)
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#define DEBUG_CH_REF (0)
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#define DEBUG_CH_SIG (1)
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#define DEBUG_CH_CNT (2)
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#define DEBUG_CHAN_MAX (3)
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struct debug_data_s {
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uint8_t enable;
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@ -5,75 +5,59 @@
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#include "ltc1867.h"
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#include "debug.h"
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__attribute__((section(".bss_ccm"))) uint32_t ltc1867_samp_cnt = 0;
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__attribute__((section(".data_ccm"))) uint16_t ltc1867_spi_data[LTC1867_CH_CNT] = {0x9400, 0x8400}; /* order: ch2, ch0 */
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void ltc1867_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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TIM_OCInitTypeDef TIM_OCInitStructure;
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SPI_InitTypeDef SPI_InitStructure;
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/* TIM3 16bit for IRLED and sample */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
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NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
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/* TIM2 32bit for sample */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
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NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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/* Time base configuration */
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TIM_TimeBaseStructure.TIM_Period = 65535;
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TIM_TimeBaseStructure.TIM_Prescaler = TIMER_SRC_FREQ / LEDIR_FREQ / 65536 - 1;
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TIM_TimeBaseStructure.TIM_Period = TIMER_PERIOD_SAMPLE;
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TIM_TimeBaseStructure.TIM_Prescaler = 0;
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
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TIM_ARRPreloadConfig(TIM3, ENABLE);
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/* TIM3 channel3 pwm output */
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TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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TIM_OCInitStructure.TIM_Pulse = 32768;
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TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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TIM_OC3Init(TIM3, &TIM_OCInitStructure);
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TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
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/* TIM3 channel4 for sample interval */
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TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
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TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
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TIM_OCInitStructure.TIM_Pulse = 0;
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TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
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TIM_OC4Init(TIM3, &TIM_OCInitStructure);
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TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable);
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TIM_ITConfig(TIM3, TIM_IT_CC4, ENABLE);
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/* TIM2 enable counter */
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TIM_Cmd(TIM3, ENABLE);
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TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
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TIM_PrescalerConfig(TIM2, 0, TIM_PSCReloadMode_Immediate);
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TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
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TIM_Cmd(TIM2, ENABLE);
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/* TIM4 16bit for ADC conversion */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
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/* Time base configuration */
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/* TIM3 16bit for ADC conversion */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
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TIM_TimeBaseStructure.TIM_Period = TIMER_PERIOD_DELAY;
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TIM_TimeBaseStructure.TIM_Prescaler = 0;
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
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/* Prescaler configuration */
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TIM_PrescalerConfig(TIM4, 0, TIM_PSCReloadMode_Immediate);
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/* TIM4 disable counter, start when ltc1867 need delay */
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TIM_Cmd(TIM4, DISABLE);
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TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
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TIM_PrescalerConfig(TIM3, 0, TIM_PSCReloadMode_Immediate);
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TIM_Cmd(TIM3, DISABLE);
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/* LEDIR pin configure */
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GPIO_InitStructure.GPIO_Pin = PIN_LEDIR;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
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GPIO_Init(PORT_LEDIR, &GPIO_InitStructure);
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GPIO_PinAFConfig(PORT_LEDIR, GPIO_PinSource0, GPIO_AF_TIM3);
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ltc1867_ledir_off();
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/* LTC1867 conv pin configure */
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GPIO_InitStructure.GPIO_Pin = PIN_CONV;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
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GPIO_Init(PORT_LTC1867, &GPIO_InitStructure);
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/* config SPI for LTC1867 communication */
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@ -99,24 +83,39 @@ void ltc1867_init(void)
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SPI_InitStructure.SPI_CRCPolynomial = 7;
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SPI_Init(SPI1, &SPI_InitStructure);
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SPI_Cmd(SPI1, ENABLE);
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// ltc1867_spi_select();
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// ltc1867_transfer(ltc1867_spi_data[LTC1867_CH_CNT - 1]);
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ltc1867_spi_select();
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ltc1867_transfer(ltc1867_spi_data[LTC1867_CH_CNT - 1]);
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}
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void ltc1867_ledir_on(void)
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{
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GPIO_SetBits(PORT_LEDIR, PIN_LEDIR);
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}
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void ltc1867_ledir_off(void)
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{
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GPIO_ResetBits(PORT_LEDIR, PIN_LEDIR);
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}
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void ltc1867_ledir_toggle(void)
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{
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GPIO_ToggleBits(PORT_LEDIR, PIN_LEDIR);
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}
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void ltc1867_delay(void)
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{
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FlagStatus sts;
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TIM_SetCounter(TIM4, 0);
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TIM_ClearFlag(TIM4, TIM_FLAG_Update);
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TIM_Cmd(TIM4, ENABLE);
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TIM_SetCounter(TIM3, 0);
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TIM_ClearFlag(TIM3, TIM_FLAG_Update);
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TIM_Cmd(TIM3, ENABLE);
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while (1) {
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sts = TIM_GetFlagStatus(TIM4, TIM_FLAG_Update);
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sts = TIM_GetFlagStatus(TIM3, TIM_FLAG_Update);
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if (sts != RESET) {
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break;
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}
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}
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TIM_Cmd(TIM4, DISABLE);
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TIM_Cmd(TIM3, DISABLE);
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}
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void ltc1867_conv(void)
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@ -149,19 +148,36 @@ uint16_t ltc1867_transfer(uint16_t data_send)
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return SPI_I2S_ReceiveData(SPI1);
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}
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void TIM3_IRQHandler(void)
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void TIM2_IRQHandler(void)
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{
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uint16_t val_spi, val_tim;
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uint16_t val[LTC1867_CH_CNT];
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ltc1867_conv(); /* this point start convert */
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ltc1867_delay(); /* delay 3.5us for convert time, reference for LTC1867 datasheet */
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ltc1867_spi_select(); /* convert complete, make convert pin low for reading sample data by SPI */
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val_spi = ltc1867_transfer(0x8400); /* read convert data and send next channel information */
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TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
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TIM_ClearITPendingBit(TIM3, TIM_IT_CC4);
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val_tim = TIM_GetCapture4(TIM3);
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TIM_SetCompare4(TIM3, val_tim + TIMER_INTERVAL);
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/* for control led IR */
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ltc1867_samp_cnt++;
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if (ltc1867_samp_cnt == (SAMPLES_PER_PERIOD / 2)) {
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ltc1867_ledir_on();
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} else if (ltc1867_samp_cnt >= SAMPLES_PER_PERIOD) {
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ltc1867_ledir_off();
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ltc1867_samp_cnt = 0;
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}
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debug_write_data(0, (float)val_spi);
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/* sample multi channel adc data */
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for (uint8_t i = 0; i < LTC1867_CH_CNT; i++) {
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ltc1867_conv(); /* this point start convert */
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ltc1867_delay(); /* delay 3.5us for convert time, reference for LTC1867 datasheet */
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ltc1867_spi_select(); /* convert complete, make convert pin low for reading sample data by SPI */
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val[i] = ltc1867_transfer(ltc1867_spi_data[i]); /* read convert data and send next channel information */
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}
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debug_write_data(DEBUG_CH_REF, (float)val[0]);
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debug_write_data(DEBUG_CH_SIG, (float)val[1]);
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// debug_write_data(DEBUG_CH_CNT, (float)ltc1867_samp_cnt * (65536 / SAMPLES_PER_PERIOD));
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if (ltc1867_samp_cnt < SAMPLES_PER_PERIOD / 2) {
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debug_write_data(DEBUG_CH_CNT, (float)0);
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} else {
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debug_write_data(DEBUG_CH_CNT, (float)65535);
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}
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debug_send_frame();
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}
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@ -8,9 +8,12 @@
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#include "stm32f4xx.h"
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#define LEDIR_FREQ (8)
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#define SAMPLES_PER_PERIOD (1024)
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#define TIMER_SRC_FREQ (84 * 1000 * 1000)
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#define TIMER_PERIOD_SAMPLE (TIMER_SRC_FREQ / LEDIR_FREQ / SAMPLES_PER_PERIOD - 1)
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#define TIMER_PERIOD_DELAY (TIMER_SRC_FREQ / 1000 / 1000 * 35 / 10 - 1) /* 3.5us */
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#define TIMER_INTERVAL (32)
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#define LTC1867_CH_CNT (2)
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#define PORT_LEDIR (GPIOB)
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#define PIN_LEDIR (GPIO_Pin_0)
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@ -23,6 +26,9 @@
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#define PIN_SPI_SDI (GPIO_Pin_7)
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void ltc1867_init(void);
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void ltc1867_ledir_on(void);
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void ltc1867_ledir_off(void);
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void ltc1867_ledir_toggle(void);
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void ltc1867_delay(void);
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void ltc1867_conv(void);
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void ltc1867_spi_select(void);
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