diff options
Diffstat (limited to 'src/sample/io_sample/TIM/PWM/main.c')
| -rw-r--r-- | src/sample/io_sample/TIM/PWM/main.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/sample/io_sample/TIM/PWM/main.c b/src/sample/io_sample/TIM/PWM/main.c new file mode 100644 index 0000000..777f366 --- /dev/null +++ b/src/sample/io_sample/TIM/PWM/main.c @@ -0,0 +1,174 @@ +/** +********************************************************************************************************* +* Copyright(c) 2019, Realtek Semiconductor Corporation. All rights reserved. +********************************************************************************************************** +* @file main.c +* @brief PWM demo and complementary output demo of PWM. +* @details +* @author yuan +* @date 2019-02-18 +* @version v1.0 +********************************************************************************************************* +*/ + +/* Includes ------------------------------------------------------------------*/ +#include <stdlib.h> +#include <string.h> +#include "rtl876x_nvic.h" +#include "rtl876x_pinmux.h" +#include "rtl876x_rcc.h" +#include "rtl876x_tim.h" +#include "trace.h" +#include "platform_utils.h" + +/* Defines --------------------------------------------------------------*/ +/** Define pwm output pin. + * P0_1 is connected to LED0 on the EVB. + */ +#define PWM_OUT_PIN P0_1 +/** Define pwm complementary output pin. + * P0_2 is connected to LED1 on the EVB. + */ +#define PWM_OUT_P_PIN P0_2 +#define PWM_OUT_N_PIN P2_2 + + +/** Define TIM num and pinmux of PWM output. + * Timer2 to Timer5 all have PWM output function. + * But only Timer2 support PWM complementary output function, other timers do not support it. + */ +#define PWM_TIMER_NUM TIM2 +#define PWM_OUT_PIN_PINMUX TIM_PWM2//timer_pwm2 +#define PWM_OUT_P_PIN_PINMUX PWM2_P +#define PWM_OUT_N_PIN_PINMUX PWM2_N + +/* Config PWM_PERIOD and PWM_DUTY_CYCLE */ +#define PWM_PERIOD 100000 //uint:us +#define PWM_DUTY_CYCLE 50 //uint:percent + +/* PWM_HIGH_COUNT = */ +#define PWM_HIGH_COUNT (((PWM_PERIOD)*((PWM_DUTY_CYCLE*40)/100))-1) //PWM CLOCK = 40000000 +#define PWM_LOW_COUNT (((PWM_PERIOD)*(((100-PWM_DUTY_CYCLE)*40)/100))-1) + +#define PWM_DEAD_ZONE_CLOCK_SOURCE_5M 0 +#define PWM_DEAD_ZONE_BYPASS 0 +#define PWM_COMPL_OUTPUT_EM_STOP_TEST 0 + +/** Config PWM_DEAD_ZONE_TIME. Max 8ms/32k, 51us/5M. + * When dead time is set, PWM2_P and PWM2_N will + * delay one dead time longer than PWM2 at high output level. + * When the dead_zone time is longer than the high-level time of PWM, + * PWM_P will always output low-level. + * When the dead_zone time is longer than the low-level time of PWM, + * PWM_N will always output low-level. + */ +#if PWM_DEAD_ZONE_CLOCK_SOURCE_5M +#define PWM_DEAD_ZONE_TIME 4 //uint:us +#define PWM_DEAD_ZONE_SIZE ((PWM_DEAD_ZONE_TIME)*5-1) +#else +#define PWM_DEAD_ZONE_TIME 5 //uint:ms +#define PWM_DEAD_ZONE_SIZE ((PWM_DEAD_ZONE_TIME)*32-1) +#endif + +/** + * @brief Initialization of pinmux settings and pad settings. + * @param No parameter. + * @return void +*/ +void board_pwm_init(void) +{ + Pad_Config(PWM_OUT_PIN, PAD_PINMUX_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE, PAD_OUT_HIGH); + Pad_Config(PWM_OUT_P_PIN, PAD_PINMUX_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE, + PAD_OUT_HIGH); + Pad_Config(PWM_OUT_N_PIN, PAD_PINMUX_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE, + PAD_OUT_HIGH); + + /* Normal mode */ + Pinmux_Config(PWM_OUT_PIN, PWM_OUT_PIN_PINMUX); + /* Deadzone mode */ + Pinmux_Config(PWM_OUT_P_PIN, PWM_OUT_P_PIN_PINMUX); + Pinmux_Config(PWM_OUT_N_PIN, PWM_OUT_N_PIN_PINMUX); + +} + +/** + * @brief Initialize tim peripheral. + * @param No parameter. + * @return void +*/ +void driver_pwm_init(void) +{ + RCC_PeriphClockCmd(APBPeriph_TIMER, APBPeriph_TIMER_CLOCK, ENABLE); +#if PWM_DEAD_ZONE_CLOCK_SOURCE_5M + RCC_ClockSrc5MCmd(); +#endif + + TIM_TimeBaseInitTypeDef TIM_InitStruct; + + TIM_StructInit(&TIM_InitStruct); + TIM_InitStruct.TIM_Mode = TIM_Mode_UserDefine; + TIM_InitStruct.TIM_PWM_En = PWM_ENABLE; + TIM_InitStruct.TIM_PWM_High_Count = PWM_HIGH_COUNT; + TIM_InitStruct.TIM_PWM_Low_Count = PWM_LOW_COUNT; + TIM_InitStruct.PWM_Stop_State_P = PWM_STOP_AT_HIGH; + TIM_InitStruct.PWM_Stop_State_N = PWM_STOP_AT_LOW; + TIM_InitStruct.PWMDeadZone_En = DEADZONE_ENABLE; //enable to use pwn p/n output + TIM_InitStruct.PWM_Deazone_Size = PWM_DEAD_ZONE_SIZE; + TIM_TimeBaseInit(TIM2, &TIM_InitStruct); + +#if PWM_DEAD_ZONE_CLOCK_SOURCE_5M + TIM_PWMChangeDZClockSrc(TIMER_PWM2_CR, ENABLE); +#endif + + TIM_Cmd(TIM2, ENABLE); + +#if PWM_DEAD_ZONE_BYPASS + TIM_PWMDZBypassCmd(TIMER_PWM2_CR, ENABLE); +#endif +} + +/** + * @brief Demo code of operation about PWM. + * @param No parameter. + * @return void + */ +void pwm_demo(void) +{ + /* Configure PAD and pinmux firstly! */ + board_pwm_init(); + + /* Initialize TIM peripheral */ + driver_pwm_init(); +} + +/** + * @brief Entry of app code + * @return int (To avoid compile warning) + */ +int main(void) +{ + extern uint32_t random_seed_value; + srand(random_seed_value); + pwm_demo(); + + while (1) + { +#if PWM_COMPL_OUTPUT_EM_STOP_TEST + platform_delay_ms(2000); + //PWM complementary output emergency stop. + TIM_PWMComplOutputEMCmd(PWM2, ENABLE); + platform_delay_ms(2000); + //Resume PWM complementary output. + TIM_PWMComplOutputEMCmd(PWM2, DISABLE); +#else + __nop(); + __nop(); + __nop(); + __nop(); + __nop(); + __nop(); +#endif + } +} + +/******************* (C) COPYRIGHT 2019 Realtek Semiconductor Corporation *****END OF FILE****/ |