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Arduino for STM32 Everything relating to using STM32 boards with the Arduino IDE Skip to content Search… Search Advanced search Quick links Unanswered topics Active topics Search The team FAQ Login Home Board index Arduino for STM32 Projects Search [SOLVED] 3 channel PWM generator using timer-triggered DMA Post Reply Print view Search this topic… Search Advanced search 40 posts Previous 1 2 3 4 ted Posts: 312 Joined: Sun Jul 16, 2017 9:57 pm Re: STM32 Timers Quote Post by ted » Fri Jul 06, 2018 8:51 pm This two lines are causing the problems. Code: Select all //timer_dma_enable_req(dev3, cc_channel3);// Code: Select all //ret = dma_tube_cfg(DMA1, DMA_CHX, &dma_cfg); Top User avatar Rick Kimball Posts: 1400 Joined: Tue Apr 28, 2015 1:26 am Location: Eastern NC, US Contact: Contact Rick Kimball Website Re: STM32 Timers Quote Post by Rick Kimball » Fri Jul 06, 2018 9:01 pm @stevestrong gave you the answer on which pins to use back here: viewtopic.php?f=19&t=3820#p46900 #if 1 static const int WS281X_PIN = PB1; #define DMA_REQ_SRC_TIMX_CHNX DMA_REQ_SRC_TIM3_CH4 #define TIMER_DMA_BASE_CCRX TIMER_DMA_BASE_CCR4 #define DMA_CHX DMA_CH3 #elif 0 static const int WS281X_PIN = PB7; #define DMA_REQ_SRC_TIMX_CHNX DMA_REQ_SRC_TIM4_CH2 #define TIMER_DMA_BASE_CCRX TIMER_DMA_BASE_CCR2 #define DMA_CHX DMA_CH4 #elif 0 static const int WS281X_PIN = PA8; #define DMA_REQ_SRC_TIMX_CHNX DMA_REQ_SRC_TIM1_CH1 #define TIMER_DMA_BASE_CCRX TIMER_DMA_BASE_CCR1 #define DMA_CHX DMA_CH2 #elif 0 static const int WS281X_PIN = PB0; #define DMA_REQ_SRC_TIMX_CHNX DMA_REQ_SRC_TIM3_CH3 #define TIMER_DMA_BASE_CCRX TIMER_DMA_BASE_CCR3 #define DMA_CHX DMA_CH2 #endif -rick Top ted Posts: 312 Joined: Sun Jul 16, 2017 9:57 pm Re: STM32 Timers Quote Post by ted » Fri Jul 06, 2018 10:32 pm I changed to PB1, no conflicts and no signal on PB1. Code: Select all #define SAMPLES 100 #include dma_tube_config dma_cfg, dma_cfg2, dma_cfg3; /* /////////////// // PB0 TIM3 CH3 uses DMA CH2 #define DMA_REQ_SRC_TIMX_CHX DMA_REQ_SRC_TIM3_CH3 #define TIMER_DMA_BASE_CCRX TIMER_DMA_BASE_CCR3 #define DMA_CHX DMA_CH2 ///////////////// */ //////////////////////// //static const int WS281X_PIN = PB1; #define DMA_REQ_SRC_TIMX_CHNX DMA_REQ_SRC_TIM3_CH4 #define TIMER_DMA_BASE_CCRX TIMER_DMA_BASE_CCR4 #define DMA_CHX DMA_CH3 //////////////////////// int flag1 = 0; int flag2 = 0; int flag3 = 0; int out1 = PB7; int out2 = PA8; int out3 = PB1; int val1[SAMPLES]; int val2[SAMPLES]; int val3[SAMPLES]; int16 shift = 0; int amp = 35; int cnt = 0; int time_track = 0; float stp = 6.2831 / SAMPLES; int ret = 17; timer_dev *dev1 = PIN_MAP[out1].timer_device; timer_dev *dev2 = PIN_MAP[out2].timer_device; uint8 cc_channel1 = PIN_MAP[out1].timer_channel; uint8 cc_channel2 = PIN_MAP[out2].timer_channel; /////////////////////////////// timer_dev *dev3 = PIN_MAP[out3].timer_device; uint8 cc_channel3 = PIN_MAP[out3].timer_channel; ////////////////////////// void fun() { flag1++; } void fun2() { flag2++; } void fun3() { flag3++; } void timer_conf() { //T4 timer_dma_set_base_addr(dev1, TIMER_DMA_BASE_CCR2); timer_dma_set_burst_len(dev1, 1); timer_dma_enable_req(dev1, cc_channel1); timer_set_reload(dev1, 102); timer_set_prescaler(dev1, 0); //T2 timer_dma_set_base_addr(dev2, TIMER_DMA_BASE_CCR1); timer_dma_set_burst_len(dev2, 1); timer_dma_enable_req(dev2, cc_channel2); timer_set_reload(dev2, 102); timer_set_prescaler(dev2, 0); //////////////////////////////////// timer_dma_set_base_addr(dev3, TIMER_DMA_BASE_CCR4); // timer_dma_set_burst_len(dev3, 1); // conflict #1 timer_dma_enable_req(dev3, cc_channel3);// timer_set_reload(dev3, 102); timer_set_prescaler(dev3, 0); /////////////////////////////////// } void dma_conf() { dma_init(DMA1); /* T4C2 DMA C4 */ dma_cfg.tube_dst = &(dev1->regs.gen->DMAR); dma_cfg.tube_dst_size = DMA_SIZE_32BITS; dma_cfg.tube_src = val1; dma_cfg.tube_src_size = DMA_SIZE_32BITS; dma_cfg.tube_nr_xfers = SAMPLES; dma_cfg.tube_flags = DMA_CFG_SRC_INC | DMA_CFG_CIRC | DMA_CFG_CMPLT_IE; dma_cfg.tube_req_src = DMA_REQ_SRC_TIM4_CH2; dma_cfg.target_data = 0; ret = dma_tube_cfg(DMA1, DMA_CH4, &dma_cfg); /* T1C1 DMA C2 */ dma_cfg.tube_dst = &(dev2->regs.gen->DMAR); dma_cfg.tube_dst_size = DMA_SIZE_32BITS; dma_cfg.tube_src = val2; dma_cfg.tube_src_size = DMA_SIZE_32BITS; dma_cfg.tube_nr_xfers = SAMPLES; dma_cfg.tube_flags = DMA_CFG_SRC_INC | DMA_CFG_CIRC | DMA_CFG_CMPLT_IE; dma_cfg.tube_req_src = DMA_REQ_SRC_TIM1_CH1; dma_cfg.target_data = 0; ret = dma_tube_cfg(DMA1, DMA_CH2, &dma_cfg); /////////////////////// /* T3C3 DMA C2 */ dma_cfg.tube_dst = &(dev3->regs.gen->DMAR); dma_cfg.tube_dst_size = DMA_SIZE_32BITS; dma_cfg.tube_src = val3; dma_cfg.tube_src_size = DMA_SIZE_32BITS; dma_cfg.tube_nr_xfers = SAMPLES; dma_cfg.tube_flags = DMA_CFG_SRC_INC | DMA_CFG_CIRC | DMA_CFG_CMPLT_IE; //dma_cfg.tube_req_src = DMA_REQ_SRC_TIMX_CHX; // dma_cfg.tube_req_src = DMA_REQ_SRC_TIM3_CH4; // dma_cfg.target_data = 0; // conflict #2 ret = dma_tube_cfg(DMA1, DMA_CH3, &dma_cfg); ////////////////////// } void dma_start() { dma_attach_interrupt(DMA1, DMA_CH4, fun); dma_enable(DMA1, DMA_CH4); timer_resume(dev1); dma_attach_interrupt(DMA1, DMA_CH2, fun2); dma_enable(DMA1, DMA_CH2); timer_resume(dev2); //////////////////////////// dma_attach_interrupt(DMA1, DMA_CH3, fun3); dma_enable(DMA1, DMA_CH4); timer_resume(dev3); //////////////////////////// } void init_wave() { int i; for (i = 0; i < SAMPLES; i++) { val1[i] = 50 + amp * sin(stp * i); val2[i] = val1[i]; val3[i] = val1[i]; } } void setup() { int i; pinMode(out1, PWM); pinMode(out2, PWM); pinMode(out3, PWM); timer_conf(); dma_conf(); dma_start(); init_wave(); } void loop() { } Last edited by ted on Fri Jul 06, 2018 10:36 pm, edited 1 time in total. Top User avatar Rick Kimball Posts: 1400 Joined: Tue Apr 28, 2015 1:26 am Location: Eastern NC, US Contact: Contact Rick Kimball Website Re: STM32 Timers Quote Post by Rick Kimball » Fri Jul 06, 2018 10:33 pm I don't think we can help you ... we have explained it 6 ways from Sunday -rick Top ted Posts: 312 Joined: Sun Jul 16, 2017 9:57 pm Re: STM32 Timers Quote Post by ted » Fri Jul 06, 2018 10:40 pm Thanks Rick for your help, I will try to solve that problem. Regards Ted Top ted Posts: 312 Joined: Sun Jul 16, 2017 9:57 pm Re: STM32 Timers Quote Post by ted » Fri Jul 06, 2018 10:41 pm Thanks all of you Top User avatar Rick Kimball Posts: 1400 Joined: Tue Apr 28, 2015 1:26 am Location: Eastern NC, US Contact: Contact Rick Kimball Website Re: STM32 Timers Quote Post by Rick Kimball » Fri Jul 06, 2018 10:59 pm Tested and works: Code: Select all #define SAMPLES 100 #include dma_tube_config dma_cfg, dma_cfg2, dma_cfg3; int val1[SAMPLES]; int val2[SAMPLES]; int val3[SAMPLES]; int amp = 35; int cnt = 0; int time_track = 0; float stp = 6.2831 / SAMPLES; int ret = 17; int out1 = PB7; // TIM4_CH2 DMA_CH4 timer_dev *dev1 = PIN_MAP[out1].timer_device; int out2 = PA8; // TIM1_CH1 DMA_CH2 timer_dev *dev2 = PIN_MAP[out2].timer_device; int out3 = PB1; // TIM3_CH4 DMA CH3 timer_dev *dev3 = PIN_MAP[out3].timer_device; void timer_conf() { // PB7 TIM4_CH2 DMA_CH4 timer_dma_set_base_addr(dev1, TIMER_DMA_BASE_CCR2); timer_dma_set_burst_len(dev1, 1); timer_dma_enable_req(dev1, PIN_MAP[out1].timer_channel); timer_set_reload(dev1, 102); timer_set_prescaler(dev1, 0); // PA8 TIM1_CH1 DMA_CH2 timer_dma_set_base_addr(dev2, TIMER_DMA_BASE_CCR1); timer_dma_set_burst_len(dev2, 1); timer_dma_enable_req(dev2, PIN_MAP[out2].timer_channel); timer_set_reload(dev2, 102); timer_set_prescaler(dev2, 0); // PB1 TIM3_CH4 DMA CH3 timer_dma_set_base_addr(dev3, TIMER_DMA_BASE_CCR4); // timer_dma_set_burst_len(dev3, 1); timer_dma_enable_req(dev3, PIN_MAP[out3].timer_channel);// timer_set_reload(dev3, 102); timer_set_prescaler(dev3, 0); } void dma_conf() { dma_init(DMA1); // PB7 TIM4_CH2 DMA_CH4 dma_cfg.tube_dst = &(dev1->regs.gen->DMAR); dma_cfg.tube_dst_size = DMA_SIZE_32BITS; dma_cfg.tube_src = val1; dma_cfg.tube_src_size = DMA_SIZE_32BITS; dma_cfg.tube_nr_xfers = SAMPLES; dma_cfg.tube_flags = DMA_CFG_SRC_INC | DMA_CFG_CIRC; dma_cfg.tube_req_src = DMA_REQ_SRC_TIM4_CH2; dma_cfg.target_data = 0; ret = dma_tube_cfg(DMA1, DMA_CH4, &dma_cfg); // PA8 TIM1_CH1 DMA_CH2 dma_cfg.tube_dst = &(dev2->regs.gen->DMAR); dma_cfg.tube_dst_size = DMA_SIZE_32BITS; dma_cfg.tube_src = val2; dma_cfg.tube_src_size = DMA_SIZE_32BITS; dma_cfg.tube_nr_xfers = SAMPLES; dma_cfg.tube_flags = DMA_CFG_SRC_INC | DMA_CFG_CIRC; dma_cfg.tube_req_src = DMA_REQ_SRC_TIM1_CH1; dma_cfg.target_data = 0; ret = dma_tube_cfg(DMA1, DMA_CH2, &dma_cfg); // PB1 TIM3_CH4 DMA CH3 dma_cfg.tube_dst = &(dev3->regs.gen->DMAR); dma_cfg.tube_dst_size = DMA_SIZE_32BITS; dma_cfg.tube_src = val3; dma_cfg.tube_src_size = DMA_SIZE_32BITS; dma_cfg.tube_nr_xfers = SAMPLES; dma_cfg.tube_flags = DMA_CFG_SRC_INC | DMA_CFG_CIRC; dma_cfg.tube_req_src = DMA_REQ_SRC_TIM3_CH4; // dma_cfg.target_data = 0; ret = dma_tube_cfg(DMA1, DMA_CH3, &dma_cfg); } void dma_start() { // PB7 TIM4_CH2 DMA_CH4 dma_enable(DMA1, DMA_CH4); timer_resume(dev1); // PA8 TIM1_CH1 DMA_CH2 dma_enable(DMA1, DMA_CH2); timer_resume(dev2); // PB1 TIM3_CH4 DMA CH3 dma_enable(DMA1, DMA_CH3); timer_resume(dev3); } void init_wave() { int i; for (i = 0; i < SAMPLES; i++) { val1[i] = 50 + amp * sin(stp * i); val2[i] = val1[i]; val3[i] = 50 + amp * sin(stp * i); } } void setup() { pinMode(out1, PWM); pinMode(out2, PWM); pinMode(out3, PWM); timer_conf(); dma_conf(); dma_start(); init_wave(); } void loop() { } -rick Top ted Posts: 312 Joined: Sun Jul 16, 2017 9:57 pm Re: STM32 Timers Quote Post by ted » Fri Jul 06, 2018 11:44 pm Thanks Rick, you are the best. There is small issue with phase correction,comparing to PB7, PB1 is shifted approximately 10 deg. and PA8 60 deg, I think I can manage this. Thanks again. I did this - no changes. Code: Select all { val1[i] = 50 + amp * sin(stp * i); //val2[i] = val1[i]; val2[i] = 50 + amp * sin(stp * i); val3[i] = 50 + amp * sin(stp * i); } Top ted Posts: 312 Joined: Sun Jul 16, 2017 9:57 pm Re: STM32 Timers - Solved by Mr. Rick Quote Post by ted » Sat Jul 07, 2018 12:29 am Solved by Mr. Rick Top Col68 Posts: 72 Joined: Thu Mar 15, 2018 2:37 pm Re: STM32 Timers - Solved by Mr. Rick Quote Post by Col68 » Sun Jul 08, 2018 4:14 pm ted wrote: ↑ Sat Jul 07, 2018 12:29 am Solved by Mr. Rick Congratulations and good luck :) when i saw Rick assist you, i thought "he will succeed" because Rick is too strong. 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