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CW32 SPI
芯源cw32f003的spi参考初始化程序
- void SPI_FLASH_Init(void)
- {
- SPI_InitTypeDef SPI_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- /************************GPIO Configuration***********************/
- RCC_AHBPeriphClk_Enable(FLASH_SPI_SCK_GPIO_CLK | FLASH_SPI_MISO_GPIO_CLK | FLASH_SPI_MOSI_GPIO_CLK | FLASH_SPI_CS_GPIO_CLK, ENABLE);
- RCC_APBPeriphClk_Enable2(RCC_APB2_PERIPH_SPI, ENABLE);
- //SPI SCK MOSI MISO 复用
- FLASH_SPI_AF_SCK;
- FLASH_SPI_AF_MISO;
- FLASH_SPI_AF_MOSI;
- //CS
- GPIO_InitStructure.Pins = FLASH_SPI_CS_GPIO_PIN;
- GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
- GPIO_Init(FLASH_SPI_CS_GPIO_PORT, GPIO_InitStructure);
- //SCK
- GPIO_InitStructure.Pins = FLASH_SPI_SCK_GPIO_PIN;
- GPIO_Init(FLASH_SPI_SCK_GPIO_PORT, GPIO_InitStructure);
- //MOSI
- GPIO_InitStructure.Pins = FLASH_SPI_MOSI_GPIO_PIN;
- GPIO_Init(FLASH_SPI_MOSI_GPIO_PORT, GPIO_InitStructure);
- //MISO
- GPIO_InitStructure.Pins = FLASH_SPI_MISO_GPIO_PIN;
- GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
- GPIO_Init(FLASH_SPI_MISO_GPIO_PORT, GPIO_InitStructure);
- //拉高CS
- FLASH_SPI_CS_HIGH();
- /************************SPI Configuration***********************/
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; // 双线全双工
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master; // 主机模式
- SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; // 帧数据长度为8bit
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; // 时钟空闲电平为高
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; // 第二个边沿采样
- SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; // 片选信号由SSI寄存器控制
- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; // 波特率为PCLK的8分频
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; // 最高有效位 MSB 收发在前
- SPI_InitStructure.SPI_Speed = SPI_Speed_Low; // 低速SPI
- SPI_Init( SPI_InitStructure);
- SPI_Cmd(ENABLE);
- }
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