WIFI 模组8286驱动

 原理图：

 注：使用的数串口1的引脚，PA1是发送端引脚，PA3是接收端引脚，PA7串口的使能位。

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1.0  WIFI模组驱动

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驱动初始化函数：

void WifiModuleDrvInit(void)
{WifiGpioInit();WifiUartInit(115200);WifiDmaInit();HwresetWifiModule();
}

宏定义串口地址...

#define USART1_DATA_ADDR		(USART1 + 0x04)					// 串口2的数据寄存器16进制地址值
#define MAX_BUF_SIZE			256
static uint8_t	g_recvDataBuf[MAX_BUF_SIZE];

创建结构体：

typedef struct
{uint32_t uartNo;rcu_periph_enum rcuUart;rcu_periph_enum rcuGpio;uint32_t gpio;uint32_t txPin;uint32_t rxPin;uint8_t irq;uint32_t dmaNo;rcu_periph_enum rcuDma;dma_channel_enum dmaCh;
}UartHwInfo_t;

创建结构体数组：

static UartHwInfo_t g_uartHwInfo = 
{USART1,RCU_USART1,RCU_GPIOA,GPIOA,GPIO_PIN_2,GPIO_PIN_3,USART1_IRQn,DMA0,RCU_DMA0,DMA_CH5
};

GPIO初始化

static void WifiGpioInit(void)
{rcu_periph_clock_enable(RCU_GPIOA);gpio_init(GPIOA, GPIO_MODE_OUT_PP, GPIO_OSPEED_2MHZ, GPIO_PIN_7);rcu_periph_clock_enable(g_uartHwInfo.rcuGpio);gpio_init(g_uartHwInfo.gpio, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, g_uartHwInfo.txPin);gpio_init(g_uartHwInfo.gpio, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, g_uartHwInfo.txPin);
}

串口初始化：

static void WifiUartInit(uint32_t baudRate)
{rcu_periph_clock_enable(g_uartHwInfo.rcuUart);usart_deinit(g_uartHwInfo.uartNo);usart_baudrate_set(g_uartHwInfo.uartNo, baudRate);usart_transmit_config(g_uartHwInfo.uartNo, USART_TRANSMIT_ENABLE);usart_receive_config(g_uartHwInfo.uartNo, USART_RECEIVE_ENABLE);usart_interrupt_enable(g_uartHwInfo.uartNo, USART_INT_IDLE);// 使能串口中断，嵌套中断向量控制器nvic_irq_enable(g_uartHwInfo.irq, 0, 0);// 在USART_CTL0寄存器中设置UEN位，使能UARTusart_enable(g_uartHwInfo.uartNo);	
}

DMA初始化：

static void WifiDmaInit(void)
{// 使能DMA时钟rcu_periph_clock_enable(g_uartHwInfo.rcuDma);// 复位DMA通道dma_deinit(g_uartHwInfo.dmaNo, g_uartHwInfo.dmaCh);// DMA结构体初始化dma_parameter_struct dmaStructure;// 配置数据传输方向dmaStructure.direction = DMA_PERIPHERAL_TO_MEMORY;// 配置数据的源地址dmaStructure.periph_addr = USART1_DATA_ADDR;// 配置源地址数固定地址还是增长,配置为固定地址dmaStructure.periph_inc = DMA_PERIPH_INCREASE_DISABLE;// 配置数据传输位宽dmaStructure.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;// 配置数据目的地址dmaStructure.memory_addr = (uint32_t)g_recvDataBuf;// 配置目的地址是固定的还是增长的dmaStructure.memory_inc = DMA_MEMORY_INCREASE_ENABLE;// 配置目的数据传输位宽dmaStructure.memory_width = DMA_MEMORY_WIDTH_8BIT;// 配置数据传输最大次数dmaStructure.number = MAX_BUF_SIZE;// 配置DMA通道优先级dmaStructure.priority = DMA_PRIORITY_HIGH;// 初始化DMAdma_init(g_uartHwInfo.dmaNo, g_uartHwInfo.dmaCh, &dmaStructure);// 使能串口接收数据使用DMAusart_dma_receive_config(g_uartHwInfo.uartNo, USART_RECEIVE_DMA_ENABLE);// 使能DMA通道dma_channel_enable(g_uartHwInfo.dmaNo, g_uartHwInfo.dmaCh);}

wifi驱动复位

void HwresetWifiModule(void)
{DBG_log("wifi module,now hwreset it!\n");gpio_bit_reset(GPIOA, GPIO_PIN_7);DelayNms(100);gpio_bit_set(GPIOA, GPIO_PIN_7);
}

串口中断服务函数：

void USART1_IRQHandle(void)
{if (usart_interrupt_flag_get(g_uartHwInfo.uartNo, USART_INT_FLAG_IDLE) != RESET){// 获取中断标志位后清除中断标志位usart_interrupt_flag_clear(g_uartHwInfo.uartNo, USART_INT_FLAG_IDLE);usart_data_receive(g_uartHwInfo.uartNo);DBG_log("uart recv str:%s\n", g_recvDataBuf);dma_channel_disable(g_uartHwInfo.dmaNo, g_uartHwInfo.dmaCh);dma_transfer_number_config(g_uartHwInfo.dmaNo, g_uartHwInfo.dmaCh, MAX_BUF_SIZE);dma_channel_enable(g_uartHwInfo.dmaNo, g_uartHwInfo.dmaCh);}
}

获取接受和发送字符：

char *RecvWifiModuleStr(void)
{return (char*)g_recvDataBuf;
}void ClearRecvWifiStr(void)
{memset(g_recvDataBuf, 0, MAX_BUF_SIZE);
}void SendWifiModuleStr(const char *sendStr)
{DBG_log("uart send str:%d\n",sendStr);while(*sendStr != '\0'){usart_data_transmit(g_uartHwInfo.uartNo, *sendStr);while(RESET == usart_flag_get(g_uartHwInfo.uartNo, USART_FLAG_TBE));sendStr++;}
}

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2.0 头文件

#ifndef _WIFI_DRV_H_
#define _WIFI_DRV_H_
#include <stdint.h>void HwresetWifiModule(void);
void WifiModuleDrvInit(void);
void USART1_IRQHandle(void);
char *RecvWifiModuleStr(void);
void ClearRecvWifiStr(void);
void SendWifiModuleStr(const char *sendStr);#endif