SDK API 使用指南

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2023-12-01

API接口按模块划分。如下图：

涉及的模块有：

GPIO
I2C
SPI
PWM
声音输入
声音输出和播放
UART

下面给出开发常用的api参考接口，其它模块具体的可以到对应driver下去查询。

GPIO

参考代码在：vsp\mcu\drivers\gpio\gpio_nre.c

typedef enum {
    GPIO_DIRECTION_INPUT = 0,
    GPIO_DIRECTION_OUTPUT
} GPIO_DIRECTION;

GPIO_DIRECTION GpioGetDirection(unsigned int port);
int GpioSetDirection(unsigned int port, GPIO_DIRECTION direction);

typedef enum {
    GPIO_LEVEL_LOW = 0,
    GPIO_LEVEL_HIGH
} GPIO_LEVEL;

GPIO_LEVEL GpioGetLevel(unsigned int port);
int GpioSetLevel(unsigned int port, GPIO_LEVEL level);

//-------------------------------------------------------------------------------------------------
// GPIO trigger function
typedef enum {
    GPIO_TRIGGER_EDGE_FALLING   = 0x01,
    GPIO_TRIGGER_EDGE_RISING    = 0x02,
    GPIO_TRIGGER_EDGE_BOTH      = 0x03,
    GPIO_TRIGGER_LEVEL_HIGH     = 0x04,
    GPIO_TRIGGER_LEVEL_LOW      = 0x08,
} GPIO_TRIGGER_EDGE;

typedef int (*GPIO_CALLBACK)(unsigned int port, void *pdata);

void GpioMaskTrigger(unsigned int port);
void GpioUnmaskTrigger(unsigned int port);
int GpioEnableTrigger(unsigned int port, GPIO_TRIGGER_EDGE edge, GPIO_CALLBACK callback, void *pdata);
int GpioDisableTrigger(unsigned int port);
void GpioSuspend(void);
void GpioResume(void);

PWM

参考代码在：vsp\mcu\drivers\gpio\gpio_nre.c

// GPIO PWM function
int GpioEnablePWM(unsigned int port, unsigned int freq, unsigned int duty);
int GpioDisablePWM(unsigned int port);

I2C

参考代码在：vsp\mcu\drivers\i2c\drv_dw_i2c.c

/* i2c master*/
void *gx_i2c_open(unsigned int id);
int gx_i2c_set_speed(unsigned int id, unsigned int speed);
int gx_i2c_transfer(void *dev, struct i2c_msg *msgs, int num);
int gx_i2c_tx(int bus_id, unsigned int devid, unsigned int reg_address, unsigned char *tx_data, unsigned int count);
int gx_i2c_rx(int bus_id, unsigned int devid, unsigned int reg_address, unsigned char *rx_data, unsigned int count);
int gx_i2c_close(void *dev);

/* i2c slave*/
void *gx_i2c_slave_open(unsigned int id, unsigned int devid, i2c_slave_cb_t callback);
int gx_i2c_slave_close(void *dev);

SPI

参考代码在：vsp\mcu\drivers\spi\dw_spi.c

int spi_device_init(struct spi_device* spi_device);
int spi_xfer(const struct spi_device* spi_device, const uint8_t *tx, uint8_t *rx, uint32_t len);
int spi_write_then_read(const struct spi_device* spi_device,
        const uint8_t *txbuf, unsigned int n_tx,
        void *rxbuf, unsigned int n_rx);

UART

参考代码在：vsp\mcu\drivers\uart\dw_uart.c

支持同步读写和异步读写

我们实现了套串口交互协议，称为：uart message 2.0 协议。参考：vsp\mcu\vsp\common\uart_message_v2.c