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lincaigui 7 months ago
parent 0b5f410c06
commit de5054a911
1 changed files with 161 additions and 15 deletions
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174
rtl/i2c_ctrl.v
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@ -10,13 +10,18 @@ parameter I2C_CLK_DIV = 5'd24,
MAX = 10'd1000,
SLAVE_ID = 7'h73;
//状态机参数定义
parameter IDLE = 3'd0,
START = 3'd1,
SLAVE_ADDR= 3'd2,
WAIT = 3'd3,
STOP = 3'd4;
reg [2: 0] state_c;
reg [2: 0] state_n;
parameter IDLE = 4'd0,
START = 4'd1,
SLAVE_ADDR = 4'd2,
ACK_1 = 4'd3,
ACK_2 = 4'd4,
ACK_3 = 4'd5,
DEVICE_ADDR = 4'd6,
DATA = 4'd7,
WAIT = 4'd8,
STOP = 4'd9;
reg [3: 0] state_c;
reg [3: 0] state_n;
////
//i2c时钟计数器
@ -26,7 +31,8 @@ reg i2c_clk;
//中间信号定义
reg [9: 0] cnt_wait ;//1000us
reg skip_en_1 ;//跳转信号
reg skip_en_1 ;//步骤1跳转信号
reg skip_en_2 ;//步骤2跳转信号
reg [2: 0] step ;//步骤
reg [1: 0] cnt_i2c_clk ;//i2c计数器
reg [2: 0] cnt_bit ;//bit计数器
@ -38,8 +44,9 @@ reg i2c_scl ;
reg [7: 0] slave_addr ;
reg [7: 0] device_addr ;
reg [7: 0] wr_data ;
reg ack ;//接受信号
//三态门
assign sda_en = 1'b1;//主机控制从机
assign sda_en = ((state_c == ACK_1) || (state_c == ACK_2) || (state_c == ACK_3)) ? 1'b0: 1'b1;//发送主机控制从机，接受主机释放
assign sda_in = sda;
assign sda = (sda_en == 1'b1)? i2c_sda : 1'bz;
//i2c驱动时钟设计
@ -79,13 +86,13 @@ end
//状态机第二段
always @(*)begin
case(state_c)
IDLE: if(skip_en_1 == 1'b1)begin
IDLE: if((skip_en_1 == 1'b1) || (skip_en_2 == 1'b1))begin
state_n = START;
end
else begin
state_n = IDLE;
end
START: if(skip_en_1 == 1'b1)begin
START: if((skip_en_1 == 1'b1) || (skip_en_2 == 1'b1))begin
state_n = SLAVE_ADDR;
end
else begin
@ -94,16 +101,49 @@ always @(*)begin
SLAVE_ADDR: if(skip_en_1 == 1'b1)begin
state_n = WAIT;
end
else if(skip_en_2 == 1'b1)begin
state_n = ACK_1;
end
else begin
state_n = SLAVE_ADDR;
end
ACK_1: if(skip_en_2 == 1'b1)begin
state_n = DEVICE_ADDR;
end
else begin
state_n = ACK_1;
end
DEVICE_ADDR:if(skip_en_2 == 1'b1)begin
state_n = ACK_2;
end
else begin
state_n = DEVICE_ADDR;
end
ACK_2: if(skip_en_2 == 1'b1)begin
state_n = DATA;
end
else begin
state_n = ACK_2;
end
DATA: if(skip_en_2 == 1'b1)begin
state_n = ACK_3;
end
else begin
state_n = DATA;
end
ACK_3: if(skip_en_2 == 1'b1)begin
state_n = STOP;
end
else begin
state_n = ACK_3;
end
WAIT: if(skip_en_1 == 1'b1)begin
state_n = STOP;
end
else begin
state_n = WAIT;
end
STOP: if(skip_en_1 == 1'b1)begin
STOP: if((skip_en_1 == 1'b1) || (skip_en_2 == 1'b1))begin
state_n = IDLE;
end
else begin
@ -119,6 +159,7 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
if(!sys_rst_n)begin
cnt_wait <= 10'd0;
skip_en_1 <= 1'b0;
skip_en_2 <= 1'b0;//步骤2跳转信号
step <= 3'd0;
cnt_i2c_clk <= 2'd0;
cnt_bit <= 3'd0;
@ -127,7 +168,7 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
else begin
case(state_c)
IDLE: begin
if(cnt_wait >= MAX - 1)begin
if(cnt_wait == MAX - 1)begin
cnt_wait <= 10'd0;
end
else begin
@ -139,6 +180,12 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
else begin
skip_en_1 <= 1'b0;
end
if((cnt_wait == MAX - 2'd2) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
end
START: begin
cnt_i2c_clk <= cnt_i2c_clk + 1'd1;
@ -148,6 +195,12 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
else begin
skip_en_1 <= 1'b0;
end
if((cnt_i2c_clk == 2'd2) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
end
SLAVE_ADDR: begin
cnt_i2c_clk <= cnt_i2c_clk + 1'd1;
@ -157,6 +210,12 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
else begin
skip_en_1 <= 1'b0;
end
if((cnt_i2c_clk == 2'd2) && (step == 3'd1) && (cnt_bit == 3'd7))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
if((cnt_bit == 3'd7) && (cnt_i2c_clk == 2'd3))begin
cnt_bit <= 3'd0;
end
@ -167,6 +226,69 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
cnt_bit <= cnt_bit;
end
end
ACK_1: begin
cnt_i2c_clk <= cnt_i2c_clk + 1'd1;
if((ack == 1'b1) && (cnt_i2c_clk == 2'd2) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
end
DEVICE_ADDR:begin
cnt_i2c_clk <= cnt_i2c_clk + 1'b1;
if((cnt_i2c_clk == 2'd3) && (cnt_bit == 3'd7))begin
cnt_bit <= 3'd0;
end
else if(cnt_i2c_clk == 2'd3)begin
cnt_bit <= cnt_bit + 1'b1;
end
else begin
cnt_bit <= cnt_bit;
end
if((cnt_i2c_clk == 2'd2) && (cnt_bit == 3'd7) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
end
ACK_2: begin
cnt_i2c_clk <= cnt_i2c_clk + 1;
if((ack == 1'b1) && (cnt_i2c_clk == 2'd2) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
end
DATA: begin
cnt_i2c_clk <= cnt_i2c_clk + 1'b1;
if((cnt_i2c_clk == 2'd3) && (cnt_bit == 3'd7))begin
cnt_bit <= 3'd0;
end
else if(cnt_i2c_clk == 2'd3)begin
cnt_bit <= cnt_bit + 1'b1;
end
else begin
cnt_bit <= cnt_bit;
end
if((cnt_i2c_clk == 2'd2) && (cnt_bit == 3'd7) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
end
ACK_3: begin
cnt_i2c_clk <= cnt_i2c_clk + 1;
if((ack == 1'b1) && (cnt_i2c_clk == 2'd2) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
end
WAIT: begin
if(cnt_wait == MAX - 1'd1)begin
cnt_wait <= 10'd0;
@ -189,6 +311,12 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
else begin
skip_en_1 <= 1'b0;
end
if((cnt_i2c_clk == 2'd2) && (step == 3'd1))begin
skip_en_2 <= 1'b1;
end
else begin
skip_en_2 <= 1'b0;
end
if(cnt_i2c_clk == 2'd2)begin
i2c_end <= 1'b1;
end
@ -205,6 +333,7 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
default: begin
cnt_wait <= 10'd0;
skip_en_1 <= 1'b0;
skip_en_2 <= 1'b0;
step <= step;
cnt_i2c_clk <= 2'd0;
cnt_bit <= 3'd0;
@ -213,6 +342,13 @@ always @(posedge i2c_clk or negedge sys_rst_n)begin
endcase
end
end
//ack
always @(*)begin
case(state_c)
ACK_1, ACK_2, ACK_3: ack = ~sda_in;
default: ack = 1'b0;
endcase
end
//step
always @(*)begin
case(step)
@ -221,6 +357,11 @@ always @(*)begin
device_addr = 8'h0;
wr_data = 8'h0;
end
3'd1: begin
slave_addr = {SLAVE_ID, 1'b0};
device_addr= {8'hef};
wr_data = {8'h00};
end
default:begin
slave_addr = 8'h0;
device_addr = 8'h0;
@ -233,7 +374,8 @@ always @(*)begin
case(state_c)
IDLE: i2c_scl = 1'b1;
START: i2c_scl = (cnt_i2c_clk <= 2'd2) ? 1'b1 : 1'b0;
SLAVE_ADDR: i2c_scl = ((cnt_i2c_clk == 2'd1) || (cnt_i2c_clk == 2'd2)) ? 1'b1 : 1'b0;
SLAVE_ADDR, DEVICE_ADDR, DATA, ACK_1, ACK_2, ACK_3:
i2c_scl = ((cnt_i2c_clk == 2'd1) || (cnt_i2c_clk == 2'd2)) ? 1'b1 : 1'b0;
WAIT: i2c_scl = 1'b0;
STOP: i2c_scl = (cnt_i2c_clk >= 2'd1) ? 1'b1 : 1'b0;
endcase
@ -244,6 +386,10 @@ always @(*)begin
IDLE: i2c_sda = 1'b1;
START: i2c_sda = (cnt_i2c_clk > 2'd1) ? 1'b0 : 1'b1;
SLAVE_ADDR: i2c_sda = slave_addr[7 - cnt_bit];
DEVICE_ADDR:i2c_sda = device_addr[7 - cnt_bit];
DATA: i2c_sda = wr_data[7 - cnt_bit];
ACK_1, ACK_2, ACK_3:
i2c_sda = 1'b0;
WAIT: i2c_sda = 1'b0;
STOP: i2c_sda = (cnt_i2c_clk >= 2'd2) ? 1'b1 : 1'b0;
default: i2c_sda = 1'b1;

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