Outline ![]()
Files ![]()
loading...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
/**
******************************************************************************
* @file Examples_LL/TIM/TIM_DMA/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use DMA with TIM3 Update request to
* transfer Data from memory to TIM3 Capture Compare Register 3 (CCR3)
* using the STM32F4xx TIM LL API.
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup TIM_DMA
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define CC_VALUE_NB 3
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Capture Compare buffer */
static uint32_t aCCValue[CC_VALUE_NB] = {0};
/* TIM3 Clock */
static uint32_t TimOutClock = 1;
/* Private function prototypes -----------------------------------------------*/
__STATIC_INLINE void SystemClock_Config(void);
__STATIC_INLINE void Configure_DMA(void);
__STATIC_INLINE void Configure_TIM(void);
__STATIC_INLINE void LED_Init(void);
__STATIC_INLINE void LED_Blinking(uint32_t Period);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 80 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Configure DMA transfer */
Configure_DMA();
/* Configure timer instance */
Configure_TIM();
/* Infinite loop */
while (1)
{
}
}
/**
* @brief This function enables the peripheral clock for the DMA,
* configures the DMA transfer, configures the NVIC for DMA and
* enables the DMA.
* @param None
* @retval None
*/
__STATIC_INLINE void Configure_DMA(void)
{
/******************************************************/
/* Configure NVIC for DMA transfer related interrupts */
/******************************************************/
NVIC_SetPriority(DMA1_Stream7_IRQn, 0);
NVIC_EnableIRQ(DMA1_Stream7_IRQn);
/*****************************/
/* Peripheral clock enabling */
/*****************************/
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA1);
/******************************/
/* DMA transfer Configuration */
/******************************/
LL_DMA_ConfigTransfer(DMA1, LL_DMA_STREAM_7, LL_DMA_DIRECTION_MEMORY_TO_PERIPH |
LL_DMA_PRIORITY_HIGH |
LL_DMA_MODE_CIRCULAR |
LL_DMA_PERIPH_NOINCREMENT |
LL_DMA_MEMORY_INCREMENT |
LL_DMA_PDATAALIGN_WORD |
LL_DMA_MDATAALIGN_WORD);
LL_DMA_SetChannelSelection(DMA1, LL_DMA_STREAM_7, LL_DMA_CHANNEL_5);
LL_DMA_ConfigAddresses(DMA1, LL_DMA_STREAM_7, (uint32_t)&aCCValue, (uint32_t)&TIM3->CCR3, LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_STREAM_7));
LL_DMA_SetDataLength(DMA1, LL_DMA_STREAM_7, CC_VALUE_NB);
LL_DMA_EnableIT_TC(DMA1, LL_DMA_STREAM_7);
LL_DMA_EnableIT_TE(DMA1, LL_DMA_STREAM_7);
/***************************/
/* Enable the DMA transfer */
/***************************/
LL_DMA_EnableStream(DMA1, LL_DMA_STREAM_7);
}
/**
* @brief This function configures TIM3 channel 3 to generate a PWM edge
* aligned signal with a frequency equal to 17.57 KHz and a variable
* duty cycle that is changed by the DMA after a specific number of
* update DMA requests. The number of this repetitive requests is
* defined by the TIM3 repetition counter, each 4 update requests, the
* TIM3 Channel 3 Duty Cycle changes to the next new value defined by
* the aCCValue.
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @retval None
*/
__STATIC_INLINE void Configure_TIM(void)
{
/*************************/
/* GPIO AF configuration */
/*************************/
/* Enable the peripheral clock of GPIOs */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);
/* GPIO TIM3_CH3 configuration */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_0, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_0, LL_GPIO_PULL_DOWN);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_0, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetAFPin_0_7(GPIOB, LL_GPIO_PIN_0, LL_GPIO_AF_2);
/******************************************************/
/* Configure the NVIC to handle TIM3 update interrupt */
/******************************************************/
NVIC_SetPriority(TIM3_IRQn, 0);
NVIC_EnableIRQ(TIM3_IRQn);
/******************************/
/* Peripheral clocks enabling */
/******************************/
/* Enable the peripheral clock of TIM3 */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM3);
/***************************/
/* Time base configuration */
/***************************/
/* Set counter mode */
/* Reset value is LL_TIM_COUNTERMODE_UP */
//LL_TIM_SetCounterMode(TIM3, LL_TIM_COUNTERMODE_UP);
/* Set the TIM3 auto-reload register to get a PWM frequency at 17.57 KHz */
/* Note that the timer pre-scaler isn't used, therefore the timer counter */
/* clock frequency is equal to the timer frequency. */
/* In this example TIM3 input clock (TIM3CLK) frequency is set to APB1 clock*/
/* (PCLK1), since APB1 pre-scaler is equal to 2 and it is twice PCLK2. */
/* TIM3CLK = PCLK2 */
/* PCLK2 = HCLK */
/* => TIM3CLK = HCLK = SystemCoreClock (100 Mhz) */
/* TIM3CLK = SystemCoreClock / (APB prescaler & multiplier) */
TimOutClock = SystemCoreClock/1;
LL_TIM_SetAutoReload(TIM3, __LL_TIM_CALC_ARR(TimOutClock, LL_TIM_COUNTERMODE_UP, 17570));
/* Set the repetition counter in order to generate one update event every 4 */
/* counter cycles. */
LL_TIM_SetRepetitionCounter(TIM3, 4-1);
/*********************************/
/* Output waveform configuration */
/*********************************/
/* Set output channel 3 in PWM1 mode */
LL_TIM_OC_SetMode(TIM3, LL_TIM_CHANNEL_CH3, LL_TIM_OCMODE_PWM1);
/* TIM3 channel 3 configuration: */
LL_TIM_OC_ConfigOutput(TIM3, LL_TIM_CHANNEL_CH3, LL_TIM_OCPOLARITY_HIGH | LL_TIM_OCIDLESTATE_HIGH);
/* Compute compare value to generate a duty cycle at 75% */
aCCValue[0] = (uint32_t)(((uint32_t) 75 * (LL_TIM_GetAutoReload(TIM3) - 1)) / 100);
/* Compute compare value to generate a duty cycle at 50% */
aCCValue[1] = (uint32_t)(((uint32_t) 50 * (LL_TIM_GetAutoReload(TIM3) - 1)) / 100);
/* Compute compare value to generate a duty cycle at 25% */
aCCValue[2] = (uint32_t)(((uint32_t) 25 * (LL_TIM_GetAutoReload(TIM3) - 1)) / 100);
/* Set PWM duty cycle for TIM3 channel 3*/
LL_TIM_OC_SetCompareCH3(TIM3, aCCValue[0]);
/* Enable register preload for TIM3 channel 3 */
LL_TIM_OC_EnablePreload(TIM3, LL_TIM_CHANNEL_CH3);
/****************************/
/* TIM3 DMA requests set-up */
/****************************/
/* Enable DMA request on update event */
LL_TIM_EnableDMAReq_UPDATE(TIM3);
/* Enable TIM3 Channel 3 DMA request */
LL_TIM_EnableDMAReq_CC3(TIM3);
/**********************************/
/* Start output signal generation */
/**********************************/
/* Enable TIM3 channel 3 */
LL_TIM_CC_EnableChannel(TIM3, LL_TIM_CHANNEL_CH3);
/* Enable TIM3 outputs */
LL_TIM_EnableAllOutputs(TIM3);
/* Enable counter */
LL_TIM_EnableCounter(TIM3);
/* Force update generation */
LL_TIM_GenerateEvent_UPDATE(TIM3);
}
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
__STATIC_INLINE void LED_Init(void)
{
/* Enable the LED2 Clock */
LED2_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED2 */
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
}
/**
* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
__STATIC_INLINE void LED_Blinking(uint32_t Period)
{
/* Toggle IO in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(Period);
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Timer update interrupt processing
* @param None
* @retval None
*/
void TimerUpdate_Callback(void)
{
static uint32_t UpdateEventCnt = 0;
/* At every update event the CCR3 register is updated with a new value */
/* which is DMA transferred from aCCValue[]. */
/* Note that the update event (UEV) is generated after upcounting is */
/* repeated for the number of times programmed in the repetition */
/* counter register (TIM1_RCR) + 1 */
if (LL_TIM_OC_GetCompareCH3(TIM3) != aCCValue[UpdateEventCnt])
{
LED_Blinking(LED_BLINK_ERROR);
}
else
{
UpdateEventCnt = (UpdateEventCnt+1) % CC_VALUE_NB;
}
}
/**
* @brief DMA transfer complete callback
* @note This function is executed when the transfer complete interrupt
* is generated after DMA transfer
* @retval None
*/
void TransferComplete_Callback()
{
/* Once the DMA transfer is completed the CCR3 value must match */
/* the value of the last element of aCCValue[]. */
if (LL_TIM_OC_GetCompareCH3(TIM3) != aCCValue[CC_VALUE_NB-1])
{
LED_Blinking(LED_BLINK_ERROR);
}
}
/**
* @brief DMA transfer error callback
* @note This function is executed when the transfer error interrupt
* is generated during DMA transfer
* @retval None
*/
void TransferError_Callback()
{
LED_Blinking(LED_BLINK_ERROR);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/