Bare metal training_03_timers_pwm
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This document provides an overview of a training on timers and PWM for bare metal embedded systems. The goals are to learn clock control, generate 1Hz signals using delays and timers, and create PWM signals at predefined duty cycles. It explains clock control diagrams and settings, and provides code examples to generate a 1Hz signal using delays, use Timer4 to toggle a pin in an interrupt handler, and set up PWM on Timer4 Channel 3. Finally, it lists an individual task to control 4 LEDs with PWM using different channels and buttons to fade the LEDs in/out.
Bare metal training_03_timers_pwm
- 1. GlobalLogic Embedded Starter Kit Timers and PWM Training 03 Bare Metal Trainings
- 2. Contents Assignments and Goals Theory Practice Individual task 19.10.2020 15:13 Bare Metal Training 03 2
- 3. Assignments and Goals Learn about clock control Create firmware that generate 1Hz signal Create firmware that works with Timers to generate signals Create firmware that generate PWM signal with predefined duty cycle 19.10.2020 15:13 Bare Metal Training 03 3
- 4. Clock control diagram 19.10.2020 15:13 Bare Metal Training 03 4
- 5. Clock control settings 19.10.2020 15:13 Bare Metal Training 03 5
- 6. Clock control settings 19.10.2020 15:13 Bare Metal Training 03 6
- 7. Create FW that generates 1Hz signal 19.10.2020 15:13 Bare Metal Training 03 7 /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { HAL_Delay(500); HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_13); /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */
- 8. Create FW that generates 1Hz signal 19.10.2020 15:13 Bare Metal Training 03 8
- 9. Timers 19.10.2020 15:13 Bare Metal Training 03 9
- 10. Timer4 diagram 19.10.2020 15:13 Bare Metal Training 03 10
- 11. Create FW that work with Timer4 19.10.2020 15:13 Bare Metal Training 03 11
- 12. Create FW that work with Timer4 19.10.2020 15:13 Bare Metal Training 03 12
- 13. Create FW that work with Timer4 19.10.2020 15:13 Bare Metal Training 03 13 In main() { HAL_TIM_Base_Start_IT(&htim4); while (1) {} } void TIM4_IRQHandler(void) { /* USER CODE BEGIN TIM4_IRQn 0 */ HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_15); /* USER CODE END TIM4_IRQn 0 */ HAL_TIM_IRQHandler(&htim4); /* USER CODE BEGIN TIM4_IRQn 1 */ /* USER CODE END TIM4_IRQn 1 */ }
- 14. Create FW that work with Timer4 19.10.2020 15:13 Bare Metal Training 03 14
- 15. Create FW that work with PWM 19.10.2020 15:13 Bare Metal Training 03 15
- 16. Create FW that work with PWM 19.10.2020 15:13 Bare Metal Training 03 16 In main() { HAL_TIM_PWM_Start(&htim4, TIM_CHANNEL_3); TIM4->CCR3=100; while (1) {} }
- 17. Create FW that work with PWM 19.10.2020 15:13 Bare Metal Training 03 17
- 18. Individual task Enable 4 PWMs to control LEDs (PD15, PD14, PD13, PD12) Blink LED without interrupts and main loop (by timer HW) Fade In/Out LEDs with help of buttons (or automatically by algorithm) 19.10.2020 15:13 Bare Metal Training 03 18