Coo1Runner-Ⅱ器件实现SPI控制状态机 摘要:SPI ControISTate Machine:SPI控制状态机此状态机如图所示,主要功能如下。(1)产生从片选信号。(2)控制和装载SPI发送移位寄存器。(3)监控SPI总线,以确定节传输完成。(4)产生时钟屏蔽信号,以控制输出到SPI总线的时钟。(5)控制START信号,完成数据传输。(6)控制SCK按照CPOL的...
state is when createData => if (start = '1') then -- Start state machine state <= writeData; else state <= createData; end if; when writeData => data_out := std_logic_vector(to_unsigned(data, n)); -- Write data state <= delay; when delay => state ...
1概述 SPI的发送器驱动程序主要围绕SPI_MOSI以及SPI_SCLK来设计。通过前面的SPI协议学习,我们这里设计的SPI驱动程序需要支持CPHA=0 CPOL=0; CPHA=1 CPOL=0; CPHA=0 CPOL=1; CPHA=1 CPOL=1四种情况。CPHA用于控制SPI接收器的采样时钟位置,CPOL用于设置SPI_SCLK的初始电平是高电平还是低电平。 2程序设计 2.1系统...
// SPI_IDLE set to 1 is the default state of the SPI state machine,&...
//spi send state machine always@(posedgeI_sysclk)begin if(!I_rstn)begin//拉低复位 spi_tx_req <=1'b0; spi_tx_data <=8'd0; M_S <=2'd0; end elsebegin case(M_S) 0:if(!spi_busy)begin//总线不忙启动传输 spi_tx_req <=1'b1;//req信号拉高,开始传输 ...
Multiple configurations are provided for a programmable logic device (PLD), such as a field programmable gate array (FPGA), when connected to a serial peripheral interface programmable read only memory (SPI PROM) by using a programmable SPI address register incorporated into a SPI state machine of...
由于串行外设接口(Serial Peripheral Interface,SPI)总线协议具有全双工模式、占用I/O端口少、协议灵活等优点,在实时时钟、AD转换器、数字信号处理器和数字信号解码器之间得到了广泛应用[3-4]。 目前,SPIIP核已经成为SoC的标准配置,相关人员也做了很多研究。例如,周雪荣等人面向AD9222设计的一款SPI模块[5],可以配置为...
UCB2CTL1 &= ~UCSWRST; // **Initialize USCI state machine** UCB2IE |= UCRXIE; // Enable USCI_A0 RX interrupt //P1OUT &= ~0x02; // Now with SPI signals initialized, // P1OUT |= 0x02; // reset slave __delay_cycles(100); // Wait for slave to initialize ...
/* initialise fiq handler */ s3c24xx_spi_initfiq(hw); /* 初始化s3c24xx_spi结构体中的handler,为其绑定中断处理函数 */ /* setup the master state. */ /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; master->num_chipsel...
//spi send state machine always @(posedge I_clk)begin if(!I_rstn) begin//拉低复位 spi_tx_req <=1'b0; spi_tx_data <=8'd0; M_S <=2'd0; end else begin case(M_S) 0:if(!spi_busy)begin//总线不忙启动传输 spi_tx_req <=1'b1;//req信号拉高,开始传输 ...