input [7:0] adc_data的MSB LSB是多少

在 Verilog HDL 中，`[7:0]` 的写法表示一个 8 位的信号，其中 `7` 是信号的 Most Significant Bit (MSB)，即最高位，而 `0` 是信号的 Least Significant Bit (LSB)，即最低位。因此，`adc_data` 的 MSB 是第 7 位，LSB 是第 0 位。

相关问题

使用vivado2020.2，用zybo板，气压温度湿度传感器(BME280)，128x32像素单色OLED屏Pmod OLED开发一个软件，要求：利用气压温度湿度传感器测量环境，并将数据显示在128x32像素单色OLED屏上，请给出详细verilog代码和详细的实现过程

以下是一个基本的实现思路，包含部分Verilog代码，供参考：

1. 确定硬件接口：BME280可以通过I2C接口与ZYBO板连接，而Pmod OLED则可以通过SPI接口与ZYBO板连接。

2. 编写I2C和SPI通信的Verilog模块，这些模块需要定义通信协议和相应的寄存器地址。以下是一个简单的I2C通信模块的例子：

module i2c_master (
    input rst, clk,
    input sda_in,
    output reg sda_out,
    output reg sck
);

reg [7:0] addr;
reg [7:0] data;
reg [2:0] state;

localparam IDLE = 0, START = 1, SEND_ADDR = 2, SEND_DATA = 3, STOP = 4;

always @(posedge clk or posedge rst) begin
    if (rst) begin
        state <= IDLE;
        sda_out <= 1;
        sck <= 1;
    end else begin
        case (state)
            IDLE:
                sda_out <= 1;
                if (!sda_in) begin
                    state <= START;
                end
            START:
                sda_out <= 0;
                sck <= 0;
                state <= SEND_ADDR;
            SEND_ADDR:
                if (sda_in) begin
                    state <= STOP;
                end else begin
                    sda_out <= addr[7];
                    addr <= addr << 1;
                    if (addr == 0) begin
                        state <= SEND_DATA;
                    end
                end
            SEND_DATA:
                if (sda_in) begin
                    state <= STOP;
                end else begin
                    sda_out <= data[7];
                    data <= data << 1;
                    if (data == 0) begin
                        state <= STOP;
                    end
                end
            STOP:
                sda_out <= 0;
                sck <= 1;
                state <= IDLE;
        endcase
    end
end

endmodule

3. 编写BME280的数据读取模块，通过I2C接口读取传感器数据，并将其存储在适当的寄存器中。可以参考BME280的数据手册，确定需要读取的寄存器地址和读取方式。以下是一个简单的BME280数据读取模块的例子：

module bme280 (
    input rst, clk,
    output [31:0] temp, humi, press,
    output reg [7:0] status
);

localparam BME280_ADDR = 8'h76;
localparam CTRL_HUM_ADDR = 8'hf2;
localparam CTRL_MEAS_ADDR = 8'hf4;
localparam CONFIG_ADDR = 8'hf5;
localparam PRESS_MSB_ADDR = 8'hf7;
localparam PRESS_LSB_ADDR = 8'hf8;
localparam PRESS_XLSB_ADDR = 8'hf9;
localparam TEMP_MSB_ADDR = 8'hfa;
localparam TEMP_LSB_ADDR = 8'hfb;
localparam TEMP_XLSB_ADDR = 8'hfc;
localparam HUM_MSB_ADDR = 8'fd;
localparam HUM_LSB_ADDR = 8'he;

reg [7:0] ctrl_hum;
reg [7:0] ctrl_meas;
reg [7:0] config;

reg [23:0] adc_press;
reg [23:0] adc_temp;
reg [23:0] adc_humi;

reg [15:0] t1, t2, t3;
reg [15:0] p1, p2, p3, p4, p5, p6, p7, p8, p9;
reg [15:0] h1, h2, h3, h4, h5, h6;

reg [3:0] state;
localparam IDLE = 0, START = 1, READ_CTRL_HUM = 2, WRITE_CTRL_MEAS = 3, WRITE_CONFIG = 4,
    READ_PRESS_MSB = 5, READ_PRESS_LSB = 6, READ_PRESS_XLSB = 7,
    READ_TEMP_MSB = 8, READ_TEMP_LSB = 9, READ_TEMP_XLSB = 10,
    READ_HUM_MSB = 11, READ_HUM_LSB = 12;

i2c_master i2c (
    .rst(rst), .clk(clk),
    .sda_in(sda_in), .sda_out(sda_out),
    .sck(sck)
);

reg [7:0] addr;
reg [7:0] data;
wire sda_in;
wire sda_out;
wire sck;

assign temp = {adc_temp[19:4], 4'b0} * t1 + ((adc_temp[3:0] * t2) >> 11) -
              ((adc_temp[3:0] * adc_temp[3:0]) * t3) >> 20;
assign press = ((temp - p1) * p5) >> 15 + ((adc_press - p6) * p4) >> 15 +
               p7 + ((temp - p1) * p6) >> 16 + ((temp - p1) * ((temp - p1) * p8) >> 20) + p9;
assign humi = temp - (((temp - h1) * (temp - h1)) * h6) >> 10 -
             ((temp - h1) * h5) >> 10 + h2;

always @(posedge clk or posedge rst) begin
    if (rst) begin
        state <= IDLE;
        status <= 8'hff;
    end else begin
        case (state)
            IDLE:
                addr <= CTRL_HUM_ADDR;
                data <= 8'h01;
                state <= START;
            START:
                if (status[0]) begin
                    state <= READ_CTRL_HUM;
                end else begin
                    state <= WRITE_CTRL_MEAS;
                end
            READ_CTRL_HUM:
                if (status[1]) begin
                    state <= WRITE_CTRL_MEAS;
                end else begin
                    addr <= CTRL_HUM_ADDR;
                    state <= START;
                end
            WRITE_CTRL_MEAS:
                if (status[2]) begin
                    state <= WRITE_CONFIG;
                end else begin
                    addr <= CTRL_MEAS_ADDR;
                    data <= 8'h5f;
                    state <= START;
                end
            WRITE_CONFIG:
                if (status[3]) begin
                    state <= READ_PRESS_MSB;
                end else begin
                    addr <= CONFIG_ADDR;
                    data <= 8'h00;
                    state <= START;
                end
            READ_PRESS_MSB:
                if (status[4]) begin
                    state <= READ_PRESS_LSB;
                end else begin
                    addr <= PRESS_MSB_ADDR;
                    state <= START;
                end
            READ_PRESS_LSB:
                if (status[5]) begin
                    state <= READ_PRESS_XLSB;
                end else begin
                    addr <= PRESS_LSB_ADDR;
                    state <= START;
                end
            READ_PRESS_XLSB:
                if (status[6]) begin
                    state <= READ_TEMP_MSB;
                end else begin
                    addr <= PRESS_XLSB_ADDR;
                    state <= START;
                end
            READ_TEMP_MSB:
                if (status[7]) begin
                    state <= READ_TEMP_LSB;
                end else begin
                    addr <= TEMP_MSB_ADDR;
                    state <= START;
                end
            READ_TEMP_LSB:
                if (status[8]) begin
                    state <= READ_TEMP_XLSB;
                end else begin
                    addr <= TEMP_LSB_ADDR;
                    state <= START;
                end
            READ_TEMP_XLSB:
                if (status[9]) begin
                    state <= READ_HUM_MSB;
                end else begin
                    addr <= TEMP_XLSB_ADDR;
                    state <= START;
                end
            READ_HUM_MSB:
                if (status[10]) begin
                    state <= READ_HUM_LSB;
                end else begin
                    addr <= HUM_MSB_ADDR;
                    state <= START;
                end
            READ_HUM_LSB:
                if (status[11]) begin
                    state <= IDLE;
                end else begin
                    addr <= HUM_LSB_ADDR;
                    state <= START;
                end
        endcase
    end
end

always @(posedge clk or posedge rst) begin
    if (rst) begin
        ctrl_hum <= 0;
        ctrl_meas <= 0;
        config <= 0;
        adc_press <= 0;
        adc_temp <= 0;
        adc_humi <= 0;
        t1 <= 0;
        t2 <= 0;
        t3 <= 0;
        p1 <= 0;
        p2 <= 0;
        p3 <= 0;
        p4 <= 0;
        p5 <= 0;
        p6 <= 0;
        p7 <= 0;
        p8 <= 0;
        p9 <= 0;
        h1 <= 0;
        h2 <= 0;
        h3 <= 0;
        h4 <= 0;
        h5 <= 0;
        h6 <= 0;
    end else begin
        case (state)
            READ_CTRL_HUM:
                ctrl_hum <= data;
                status[0] <= 0;
            READ_PRESS_MSB:
                adc_press[23:16] <= data;
            READ_PRESS_LSB:
                adc_press[15:8] <= data;
            READ_PRESS_XLSB:
                adc_press[7:0] <= data;
            READ_TEMP_MSB:
                adc_temp[23:16] <= data;
            READ_TEMP_LSB:
                adc_temp[15:8] <= data;
            READ_TEMP_XLSB:
                adc_temp[7:0] <= data;
            READ_HUM_MSB:
                adc_humi[23:16] <= data;
            READ_HUM_LSB:
                adc_humi[15:8] <= data;
                status[1] <= 0;
            default:
                status <= 12'hfff;
        endcase
    end
end

endmodule

4. 编写OLED显示模块，通过SPI接口将解析后的数据显示在屏幕上。可以参考Pmod OLED的数据手册，确定需要设置的寄存器地址和显示方式。以下是一个简单的OLED显示模块