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CH32F10X系列BSP移植

1 工程结构

wch\arm\ch32f103c8-core
wch\arm\Libraries
wch\arm\Libraries\ch32_drivers
wch\arm\Libraries\CH32F10x_StdPeriph_Driver
wch\arm\tools

ch32f103c8-core为移植到具体芯片的BSP, Libraries存放的是厂商的驱动库(CH32F10x_StdPeriph_Driver等)和适配rt-thread的驱动(ch32_drivers), tools是在env环境下使用scons --dist所需要的依赖工具

1.1 已适配rt-thread的驱动(ch32_drivers)：

现已支持以下驱动(支持的驱动，使用到的宏开关，需要实现的接口)：

GPIO
- RT_USING_PIN
UART 1/2/3
- RT_USING_SERIAL
- BSP_USING_UART
  - BSP_USING_UART1
  - BSP_USING_UART2
  - BSP_USING_UART3

void ch32f1_usart_clock_and_io_init(USART_TypeDef* usartx);

SPI 1/2
- RT_USING_SPI
- BSP_USING_SPI
  - BSP_USING_SPI1
  - BSP_USING_SPI2

void ch32f1_spi_clock_and_io_init(SPI_TypeDef* spix);
rt_uint32_t ch32f1_spi_clock_get(SPI_TypeDef* spix);

I2C(hardware) 1/2
- RT_USING_I2C
- BSP_USING_HWI2C
  - BSP_USING_HWI2C1
  - BSP_USING_HWI2C2

void ch32f1_i2c_clock_and_io_init(I2C_TypeDef* i2cx);
void ch32f1_i2c_config(I2C_TypeDef* i2cx);

WDT
- RT_USING_WDT
- BSP_USING_IWDT
  - LSI_VALUE
RTC
- RT_USING_RTC
- BSP_USING_RTC
  - BSP_USING_RTC_LSI
  - LSI_VALUE
HWTIMER 1/2/3/4
- RT_USING_HWTIMER
- BSP_USING_HWTIMER
  - BSP_USING_TIM1_HWTIMER
  - BSP_USING_TIM2_HWTIMER
  - BSP_USING_TIM3_HWTIMER
  - BSP_USING_TIM4_HWTIMER

void ch32f1_tim_clock_init(TIM_TypeDef *timx);
rt_uint32_t ch32f1_tim_clock_get(TIM_TypeDef *timx);

struct rt_hwtimer_info* ch32f1_hwtimer_info_config_get(TIM_TypeDef *timx);

PWM 4(timer) x 4 (channel)
- RT_USING_PWM
- BSP_USING_TIM1_PWM
  - BSP_USING_TIM1_PWM_CH1
  - BSP_USING_TIM1_PWM_CH2
  - BSP_USING_TIM1_PWM_CH3
  - BSP_USING_TIM1_PWM_CH4
- BSP_USING_TIM2_PWM
  - BSP_USING_TIM2_PWM_CH1
  - BSP_USING_TIM2_PWM_CH2
  - BSP_USING_TIM2_PWM_CH3
  - BSP_USING_TIM2_PWM_CH4
- BSP_USING_TIM3_PWM
  - BSP_USING_TIM3_PWM_CH1
  - BSP_USING_TIM3_PWM_CH2
  - BSP_USING_TIM3_PWM_CH3
  - BSP_USING_TIM3_PWM_CH4
- BSP_USING_TIM4_PWM
  - BSP_USING_TIM4_PWM_CH1
  - BSP_USING_TIM4_PWM_CH2
  - BSP_USING_TIM4_PWM_CH3
  - BSP_USING_TIM4_PWM_CH4

void ch32f1_pwm_io_init(TIM_TypeDef *timx, rt_uint8_t channel);

其中需要依赖定时器的接口：

void ch32f1_tim_clock_init(TIM_TypeDef *timx);
rt_uint32_t ch32f1_tim_clock_get(TIM_TypeDef *timx);

1.2 需要实现的接口：

除了使用上面驱动提及的接口外，以下的接口必须实现：

rt_uint32_t ch32_get_sysclock_frequency(void);

2 构建具体芯片BSP

以ch32f103c8-core为例，在ENV环境下，使用MDK，至少需要准备

ch32f103c8-core (具体的BSP名)
ch32f103c8-core\applications
ch32f103c8-core\applications\SConscript
ch32f103c8-core\applications\main.c
ch32f103c8-core\board
ch32f103c8-core\board\linker_scripts
ch32f103c8-core\board\linker_scripts\link.sct
ch32f103c8-core\board\board.c
ch32f103c8-core\board\board.h
ch32f103c8-core\board\ch32f10x_conf.h
ch32f103c8-core\board\system_ch32f10x.c
ch32f103c8-core\board\Kconfig
ch32f103c8-core\board\SConscript
ch32f103c8-core\Kconfig
ch32f103c8-core\rtconfig.py
ch32f103c8-core\SConscript
ch32f103c8-core\SConstruct
ch32f103c8-core\template.uvprojx

2.1 创建template.uvprojx

新建名为template的MDK工程，删除多余的子目录target1，将目录改名为rtthread-ch32f103x，options选项栏device设置具体芯片，user编译后的动作, 如"fromelf --bin !L --output rtthread.bin"

2.2 编写board/Kconfig

menu "Hardware Drivers Config"

config SOC_CH32F103C8
        bool
        select SOC_ARM_SERIES_CH32F103
        select RT_USING_COMPONENTS_INIT
        select RT_USING_USER_MAIN
        default y

SOC_CH32F103C8为具体的芯片，SOC_ARM_SERIES_CH32F103在Libraries\Kconfig下已定义。 RT_USING_COMPONENTS_INIT，RT_USING_USER_MAIN为rt-thread设备框架默认选项。

使用适配的驱动根据宏开关编写即可，以串口驱动为例：

BSP_USING_XXX
- select RT_USING_XXX
  - BSP_USING_XXX1
  - BSP_USING_XXX2

menu "On-chip Peripheral Drivers"

config BSP_USING_UART
        bool "using onchip usart"
        select RT_USING_SERIAL
        default n

        if BSP_USING_UART
                config BSP_USING_UART1
                        bool "using uart1"
                        default n

                config BSP_USING_UART2
                        bool "using uart2"
                        default n

                config BSP_USING_UART3
                        bool "using uart3"
                        default n
        endif

比较特殊的定时器和PWM驱动额外定义了以下宏开关，详见ch32f103c8-core。

BSP_USING_TIM
- BSP_USING_TIM1
- BSP_USING_TIM2
- BSP_USING_TIM3
- BSP_USING_TIM4

2.3 在board/board.h加入接口，并在board/board.c实现

使用适配的驱动根据宏开关编写即可,如串口驱动：

BSP_USING_XXX

#ifdef BSP_USING_UART
void ch32f1_usart_clock_and_io_init(USART_TypeDef* usartx);
#endif

比较特殊的定时器和PWM驱动使用额外定义了的宏开关

#ifdef BSP_USING_TIM
void ch32f1_tim_clock_init(TIM_TypeDef *timx);
rt_uint32_t ch32f1_tim_clock_get(TIM_TypeDef *timx);

#ifdef BSP_USING_HWTIMER
struct rt_hwtimer_info* ch32f1_hwtimer_info_config_get(TIM_TypeDef *timx);
#endif

#ifdef BSP_USING_PWM
void ch32f1_pwm_io_init(TIM_TypeDef *timx, rt_uint8_t channel);
#endif
#endif

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