Renesas R7FA8D1BH (Cortex®-M85) 生成4路PWM

目录

 概述

1 软硬件环境

1.1 软件版本信息

1.2 硬件接口

2 FSP生成配置

2.1 配置参数

 2.2 创建Stack和配置PWM参数

3 FSP库函数介绍

3.1 R_GPT_Open()

3.2 R_GPT_Stop() 

3.3  R_GPT_Start() 

3.4 R_GPT_Enable() 

3.5  R_GPT_PeriodSet()

3.6  R_GPT_DutyCycleSet()

3.7 R_GPT_OutputEnable()

 3.8 R_GPT_PwmOutputDelaySet()

3.9 R_GPT_OutputDisable()

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 概述

本文主要介绍使用Renesas 提供的FSP工具配置参数实现PWM功能，内容包括参数配置，PWM功能代码的实现，以及如何生成项目工程，还使用逻辑分析仪捕捉波形，以验证PWM波形的准确性。

1 软硬件环境

1.1 软件版本信息

软硬件信息	版本信息
Renesas MCU	R7FA8D1BH(Cortex®-M85)
Keil	MDK ARM 5.38
FSP 版本	5.3.0
调试工具：dap-link	CMSIS-DAP-NSLink V2.0.0

1.2 硬件接口

1) GPT-1:   P105

2) GPT-2:   P102

3) GPT-6:   PA11 and PA12  

2 FSP生成配置

2.1 配置参数

1）配置GPT参数（GPT1）

2）配置GPT参数（GPT2）

3)  配置GPT参数（GPT6）

 2.2 创建Stack和配置PWM参数

1) 创建Stack

2) 配置参数

 配置channel-1参数

 配置channel-2参数

  配置channel-6参数

3 FSP库函数介绍

3.1 R_GPT_Open()

函数原型：

fsp_err_t R_GPT_Open	(	timer_ctrl_t *const 	p_ctrl,timer_cfg_t const *const 	p_cfg 
)	

初始化定时器模块并应用配置。实现timer_api_t::开放。

GPT硬件本身不支持一次性功能。当使用单镜头模式时，计时器将在请求的时间段过去后在ISR中停止。

通用定时器的GPT实现可以接受gpt_extended_cfg_t扩展参数。

应用范例：

/* Initializes the module. */err = R_GPT_Open(&g_timer0_ctrl, &g_timer0_cfg);

 返回值：

Return values

FSP_SUCCESS	Initialization was successful and timer has started.
FSP_ERR_ASSERTION	A required input pointer is NULL or the source divider is invalid.
FSP_ERR_ALREADY_OPEN	Module is already open.
FSP_ERR_IRQ_BSP_DISABLED	timer_cfg_t::mode is TIMER_MODE_ONE_SHOT or timer_cfg_t::p_callback is not NULL, but ISR is not enabled. ISR must be enabled to use one-shot mode or callback.
FSP_ERR_INVALID_MODE	Triangle wave PWM is only supported if GPT_CFG_OUTPUT_SUPPORT_ENABLE is 2. Selected channel does not support external count sources. External and event count sources not are available in this mode.
FSP_ERR_IP_CHANNEL_NOT_PRESENT	The channel requested in the p_cfg parameter is not available on this device.

3.2 R_GPT_Stop() 

函数原型：

fsp_err_t R_GPT_Stop	(	timer_ctrl_t *const 	p_ctrl	)	

应用案例：

  /* (Optional) Stop the timer. */(void) R_GPT_Stop(&g_timer0_ctrl);

返回值

Return values

FSP_SUCCESS	Timer successfully stopped.
FSP_ERR_ASSERTION	p_ctrl was NULL.
FSP_ERR_NOT_OPEN	The instance is not opened.

3.3  R_GPT_Start() 

函数原型

fsp_err_t R_GPT_Start	(	timer_ctrl_t *const 	p_ctrl	)	

应用范例：

/* Start the timer. */(void) R_GPT_Start(&g_timer0_ctrl);

返回值：

Return values

FSP_SUCCESS	Timer successfully started.
FSP_ERR_ASSERTION	p_ctrl was NULL.
FSP_ERR_NOT_OPEN	The instance is not opened.

3.4 R_GPT_Enable() 

函数原型：

fsp_err_t R_GPT_Enable	(	timer_ctrl_t *const 	p_ctrl	)	

使用案例：

/* Enable captures. Captured values arrive in the interrupt. */(void) R_GPT_Enable(&g_timer0_ctrl);

返回值：

Return values

FSP_SUCCESS	External events successfully enabled.
FSP_ERR_ASSERTION	p_ctrl was NULL.
FSP_ERR_NOT_OPEN	The instance is not opened.

3.5  R_GPT_PeriodSet()

函数原型：

fsp_err_t R_GPT_PeriodSet	(	timer_ctrl_t *const 	p_ctrl,uint32_t const 	period_counts 
)		

设置提供的周期值。

如果定时器正在运行，则在下一个计数器溢出后更新周期。如果计时器停止，该函数重置计数器并更新周期。实现timer_api_t:: periodSet。

警告
如果使用周期性输出，则占空比缓冲寄存器在周期缓冲寄存器之后更新。如果在计时器运行时调用此函数，并且在处理过程中发生GPT溢出，则在处理完成后计数器溢出之前，占空比将不会是期望的50%占空比。

应用范例：

  /* Get the source clock frequency (in Hz). There are 3 ways to do this in FSP:*  - If the PCLKD frequency has not changed since reset, the source clock frequency is*    BSP_STARTUP_PCLKD_HZ >> timer_cfg_t::source_div*  - Use the R_GPT_InfoGet function (it accounts for the divider).*  - Calculate the current PCLKD frequency using R_FSP_SystemClockHzGet(FSP_PRIV_CLOCK_PCLKD) and right shift*    by timer_cfg_t::source_div.** This example uses the 3rd option (R_FSP_SystemClockHzGet).*/uint32_t pclkd_freq_hz = R_FSP_SystemClockHzGet(FSP_PRIV_CLOCK_PCLKD) >> g_timer0_cfg.source_div;/* Calculate the desired period based on the current clock. Note that this calculation could overflow if the* desired period is larger than UINT32_MAX / pclkd_freq_hz. A cast to uint64_t is used to prevent this. */uint32_t period_counts =(uint32_t) (((uint64_t) pclkd_freq_hz * GPT_EXAMPLE_DESIRED_PERIOD_MSEC) / GPT_EXAMPLE_MSEC_PER_SEC);/* Set the calculated period. */err = R_GPT_PeriodSet(&g_timer0_ctrl, period_counts);assert(FSP_SUCCESS == err);

3.6  R_GPT_DutyCycleSet()

函数原型：

fsp_err_t R_GPT_DutyCycleSet	(	timer_ctrl_t *const 	p_ctrl,uint32_t const 	duty_cycle_counts,uint32_t const 	pin 
)	

在请求引脚上设置占空比。实现timer_api_t:: dutyCycleSet。

占空比在缓冲寄存器中更新。更新后的占空比在下一个周期结束后反映(计数器溢出)。

应用案例：

 /* Get the current period setting. */timer_info_t info;(void) R_GPT_InfoGet(&g_timer0_ctrl, &info);uint32_t current_period_counts = info.period_counts;/* Calculate the desired duty cycle based on the current period. Note that if the period could be larger than* UINT32_MAX / 100, this calculation could overflow. A cast to uint64_t is used to prevent this. The cast is* not required for 16-bit timers. */uint32_t duty_cycle_counts =(uint32_t) (((uint64_t) current_period_counts * GPT_EXAMPLE_DESIRED_DUTY_CYCLE_PERCENT) /GPT_EXAMPLE_MAX_PERCENT);/* Set the calculated duty cycle. */err = R_GPT_DutyCycleSet(&g_timer0_ctrl, duty_cycle_counts, GPT_IO_PIN_GTIOCB);assert(FSP_SUCCESS == err);

3.7 R_GPT_OutputEnable()

函数原型：

fsp_err_t R_GPT_OutputEnable	(	timer_ctrl_t *const 	p_ctrl,
gpt_io_pin_t 	pin 
)	

Enable output for GTIOCA and/or GTIOCB.

Return values

FSP_SUCCESS	Output is enabled.
FSP_ERR_ASSERTION	p_ctrl or p_status was NULL.
FSP_ERR_NOT_OPEN	The instance is not opened.

 3.8 R_GPT_PwmOutputDelaySet()

函数原型：

fsp_err_t R_GPT_PwmOutputDelaySet	(	timer_ctrl_t *const 	p_ctrl,
gpt_pwm_output_delay_edge_t 	edge,
gpt_pwm_output_delay_setting_t 	delay_setting,
uint32_t const 	pin 
)		

Set the Output Delay setting for the PWM output pin.

Return values

FSP_SUCCESS	The output delay was set.
FSP_ERR_ASSERTION	An input parameter was invalid.
FSP_ERR_NOT_OPEN	The instance is not opened.
FSP_ERR_INVALID_CHANNEL	The channel does not support this feature.
FSP_ERR_NOT_INITIALIZED	The PWM Output Delay Circuit has not been initialized.
FSP_ERR_INVALID_STATE	The PWM Output Delay setting cannot be updated in the current state.
FSP_ERR_UNSUPPORTED	This feature is not supported on this MCU.

3.9 R_GPT_OutputDisable()

函数原型：

fsp_err_t R_GPT_OutputDisable	(	timer_ctrl_t *const 	p_ctrl,gpt_io_pin_t 	pin 
)	

Disable output for GTIOCA and/or GTIOCB.

Return values

FSP_SUCCESS	Output is disabled.
FSP_ERR_ASSERTION	p_ctrl or p_status was NULL.
FSP_ERR_NOT_OPEN	The instance is not opened.