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#include <board.h>
#include <support.h>
#include "i2c.h"
 
int i2c_rd_done, i2c_wr_done;
 
int i2c_pending_write;
 
int i2c_rd_ptr, i2c_wr_ptr;
 
int i2c_buf_overflow;
i2c_type i2c_data[I2C_BUF_LEN];
 
unsigned char start, pointer_write, write_hbyte, write_lbyte, read_hbyte, read_lbyte;
unsigned char cmd_list[5];
unsigned char dat_list[5];
int i2c_index;
int i2c_end;
 
i2c_type * i2c_get(void)
{
        if ( !i2c_rd_done )
                return NULL;
 
        i2c_rd_done--;
 
        int tmp;
        tmp = i2c_rd_ptr;
 
        if (i2c_rd_ptr < I2C_BUF_LEN-1)
                i2c_rd_ptr++;
        else
                i2c_rd_ptr = 0;
 
        return &i2c_data[tmp];
}
 
void i2c_init(void)
{
        REG8(I2C_BASE+I2C_PRESC_HI) = 0x00;
        REG8(I2C_BASE+I2C_PRESC_LO) = 49;       //100kHz
        REG8(I2C_BASE+I2C_CTR) = I2C_CTR_EN | I2C_CTR_IRQ_EN;
        i2c_rd_done = 0;
        i2c_wr_done = 0;
        i2c_index = 0;
        i2c_wr_ptr = 0;
        i2c_rd_ptr = 0;
        i2c_buf_overflow = 0;
}
 
void i2c_set_ack_lvl(int ack_lvl, int final_ack_lvl)
{
        int ack, final_ack;
 
        ack = ( ack_lvl ) ? I2C_CR_NACK : I2C_CR_ACK;
        final_ack = ( final_ack_lvl ) ? I2C_CR_NACK : I2C_CR_ACK;
 
        start = I2C_CR_STA | I2C_CR_WR | ack;
        pointer_write = I2C_CR_WR | ack;
        write_hbyte = I2C_CR_WR | ack;
        write_lbyte = I2C_CR_WR | I2C_CR_STO | final_ack;
        read_hbyte = I2C_CR_RD | ack;
        read_lbyte = I2C_CR_RD | I2C_CR_STO | final_ack;
}
 
void i2c_byte_transfer(void)
{
        if ( i2c_index > 0 )
                if ( cmd_list[i2c_index-1] == read_hbyte )
                        i2c_data[i2c_wr_ptr].data = (REG8(I2C_BASE+I2C_RXR) << 8) & 0xFF00;
 
        REG8(I2C_BASE+I2C_TXR) = dat_list[i2c_index];
        REG8(I2C_BASE+I2C_CR) = cmd_list[i2c_index];
 
        i2c_index++;
}
 
void i2c_irq(void)
{
        REG8(I2C_BASE+I2C_CR) = I2C_CR_CLR_IRQ;
        if (i2c_index <= i2c_end )
                i2c_byte_transfer();
        else
        {
                if ( cmd_list[i2c_index-1] == read_lbyte )
                        i2c_data[i2c_wr_ptr].data |= REG8(I2C_BASE+I2C_RXR);
 
                i2c_index = 0;
 
                if ( i2c_pending_write )
                        i2c_wr_done = 1;
                else
                {
                        if (i2c_wr_ptr < I2C_BUF_LEN-1)
                                i2c_wr_ptr++;
                        else
                                i2c_wr_ptr = 0;
 
                        if (i2c_wr_ptr == i2c_rd_ptr+1)
                        {
                                i2c_rd_done = 1;
                                i2c_buf_overflow++;
                        }
                        else
                                i2c_rd_done++;
                }
        }
}
 
int i2c_trans(i2c_mode * mode, i2c_type * data)
{
        if ( i2c_index != 0 )       //if previous command not fully processed, bail out
                return -1;
 
        i2c_wr_done = 0;
 
        int i = 0;
 
        if ( mode->ptr_set || mode->read_write )    //start conditions with pointer set: (write always set ptr)
        {
                dat_list[i] = (data->address << 1) & I2C_TXR_ADR;
                dat_list[i] |= I2C_TXR_W;
                cmd_list[i++] = start;
 
                dat_list[i] = data->pointer;
                cmd_list[i++] = pointer_write;
 
                if ( !mode->read_write )                //REstart for read, NO-REstart for write
                {
                        dat_list[i] = (data->address << 1) & I2C_TXR_ADR;
                        dat_list[i] |= I2C_TXR_R;
                        cmd_list[i++] = start;
                }
        }
        else                    //start conditions with NO pointer set (read only): ONE start
        {
                dat_list[i] = (data->address << 1) & I2C_TXR_ADR;
                dat_list[i] |= I2C_TXR_R;
                cmd_list[i++] = start;
        }
 
        if ( mode->byte_word )  //read/write high byte
        {
                dat_list[i] = data->data >> 8;
                cmd_list[i++] = (mode->read_write) ? write_hbyte : read_hbyte;
        }
 
        dat_list[i] = data->data;   //read/write low byte
        cmd_list[i] = (mode->read_write) ? write_lbyte : read_lbyte;
 
        i2c_end = i;
 
        if ( !mode->read_write )    //set data to 0 for read, avoid or implications ((short)data |= byte)
        {
                i2c_data[i2c_wr_ptr] = *data;
                i2c_data[i2c_wr_ptr].data = 0x0000;
        }
 
        i2c_pending_write = mode->read_write;
 
        i2c_index = 0;
        i2c_byte_transfer();
 
        return mode->read_write+1;
}

Line No.	Rev	Author	Line
1	80	rfajardo	`#include <board.h>`
2			`#include <support.h>`
3	36	rfajardo	`#include "i2c.h"`
4
5			`int i2c_rd_done, i2c_wr_done;`
6
7			`int i2c_pending_write;`
8
9			`int i2c_rd_ptr, i2c_wr_ptr;`
10
11			`int i2c_buf_overflow;`
12			`i2c_type i2c_data[I2C_BUF_LEN];`
13
14			`unsigned char start, pointer_write, write_hbyte, write_lbyte, read_hbyte, read_lbyte;`
15			`unsigned char cmd_list[5];`
16			`unsigned char dat_list[5];`
17			`int i2c_index;`
18			`int i2c_end;`
19
20			`i2c_type * i2c_get(void)`
21			`{`
22	53	ConX.	`if ( !i2c_rd_done )`
23			`return NULL;`
24	36	rfajardo
25	53	ConX.	`i2c_rd_done--;`
26	36	rfajardo
27	53	ConX.	`int tmp;`
28			`tmp = i2c_rd_ptr;`
29	36	rfajardo
30	53	ConX.	`if (i2c_rd_ptr < I2C_BUF_LEN-1)`
31			`i2c_rd_ptr++;`
32			`else`
33			`i2c_rd_ptr = 0;`
34	36	rfajardo
35	53	ConX.	`return &i2c_data[tmp];`
36	36	rfajardo	`}`
37
38			`void i2c_init(void)`
39			`{`
40	53	ConX.	`REG8(I2C_BASE+I2C_PRESC_HI) = 0x00;`
41			`REG8(I2C_BASE+I2C_PRESC_LO) = 49; //100kHz`
42			`REG8(I2C_BASE+I2C_CTR) = I2C_CTR_EN \| I2C_CTR_IRQ_EN;`
43			`i2c_rd_done = 0;`
44			`i2c_wr_done = 0;`
45			`i2c_index = 0;`
46			`i2c_wr_ptr = 0;`
47			`i2c_rd_ptr = 0;`
48			`i2c_buf_overflow = 0;`
49	36	rfajardo	`}`
50
51			`void i2c_set_ack_lvl(int ack_lvl, int final_ack_lvl)`
52			`{`
53	53	ConX.	`int ack, final_ack;`
54	36	rfajardo
55	53	ConX.	`ack = ( ack_lvl ) ? I2C_CR_NACK : I2C_CR_ACK;`
56			`final_ack = ( final_ack_lvl ) ? I2C_CR_NACK : I2C_CR_ACK;`
57	36	rfajardo
58	53	ConX.	`start = I2C_CR_STA \| I2C_CR_WR \| ack;`
59			`pointer_write = I2C_CR_WR \| ack;`
60			`write_hbyte = I2C_CR_WR \| ack;`
61			`write_lbyte = I2C_CR_WR \| I2C_CR_STO \| final_ack;`
62			`read_hbyte = I2C_CR_RD \| ack;`
63			`read_lbyte = I2C_CR_RD \| I2C_CR_STO \| final_ack;`
64	36	rfajardo	`}`
65
66			`void i2c_byte_transfer(void)`
67			`{`
68	53	ConX.	`if ( i2c_index > 0 )`
69			`if ( cmd_list[i2c_index-1] == read_hbyte )`
70			`i2c_data[i2c_wr_ptr].data = (REG8(I2C_BASE+I2C_RXR) << 8) & 0xFF00;`
71	36	rfajardo
72	53	ConX.	`REG8(I2C_BASE+I2C_TXR) = dat_list[i2c_index];`
73			`REG8(I2C_BASE+I2C_CR) = cmd_list[i2c_index];`
74
75			`i2c_index++;`
76	36	rfajardo	`}`
77
78			`void i2c_irq(void)`
79			`{`
80	53	ConX.	`REG8(I2C_BASE+I2C_CR) = I2C_CR_CLR_IRQ;`
81			`if (i2c_index <= i2c_end )`
82			`i2c_byte_transfer();`
83			`else`
84			`{`
85			`if ( cmd_list[i2c_index-1] == read_lbyte )`
86			`i2c_data[i2c_wr_ptr].data \|= REG8(I2C_BASE+I2C_RXR);`
87	36	rfajardo
88	53	ConX.	`i2c_index = 0;`
89	36	rfajardo
90	53	ConX.	`if ( i2c_pending_write )`
91			`i2c_wr_done = 1;`
92			`else`
93			`{`
94			`if (i2c_wr_ptr < I2C_BUF_LEN-1)`
95			`i2c_wr_ptr++;`
96			`else`
97			`i2c_wr_ptr = 0;`
98	36	rfajardo
99	53	ConX.	`if (i2c_wr_ptr == i2c_rd_ptr+1)`
100			`{`
101			`i2c_rd_done = 1;`
102			`i2c_buf_overflow++;`
103			`}`
104			`else`
105			`i2c_rd_done++;`
106			`}`
107			`}`
108	36	rfajardo	`}`
109
110			`int i2c_trans(i2c_mode * mode, i2c_type * data)`
111			`{`
112	53	ConX.	`if ( i2c_index != 0 ) //if previous command not fully processed, bail out`
113			`return -1;`
114	36	rfajardo
115	53	ConX.	`i2c_wr_done = 0;`
116	36	rfajardo
117	53	ConX.	`int i = 0;`
118	36	rfajardo
119	53	ConX.	`if ( mode->ptr_set \|\| mode->read_write ) //start conditions with pointer set: (write always set ptr)`
120			`{`
121	36	rfajardo	`dat_list[i] = (data->address << 1) & I2C_TXR_ADR;`
122			`dat_list[i] \|= I2C_TXR_W;`
123			`cmd_list[i++] = start;`
124
125	53	ConX.	`dat_list[i] = data->pointer;`
126			`cmd_list[i++] = pointer_write;`
127	36	rfajardo
128	53	ConX.	`if ( !mode->read_write ) //REstart for read, NO-REstart for write`
129			`{`
130			`dat_list[i] = (data->address << 1) & I2C_TXR_ADR;`
131			`dat_list[i] \|= I2C_TXR_R;`
132			`cmd_list[i++] = start;`
133			`}`
134			`}`
135			`else //start conditions with NO pointer set (read only): ONE start`
136			`{`
137			`dat_list[i] = (data->address << 1) & I2C_TXR_ADR;`
138			`dat_list[i] \|= I2C_TXR_R;`
139			`cmd_list[i++] = start;`
140			`}`
141	36	rfajardo
142	53	ConX.	`if ( mode->byte_word ) //read/write high byte`
143			`{`
144			`dat_list[i] = data->data >> 8;`
145			`cmd_list[i++] = (mode->read_write) ? write_hbyte : read_hbyte;`
146			`}`
147	36	rfajardo
148	53	ConX.	`dat_list[i] = data->data; //read/write low byte`
149			`cmd_list[i] = (mode->read_write) ? write_lbyte : read_lbyte;`
150	36	rfajardo
151	53	ConX.	`i2c_end = i;`
152	36	rfajardo
153	53	ConX.	`if ( !mode->read_write ) //set data to 0 for read, avoid or implications ((short)data \|= byte)`
154			`{`
155			`i2c_data[i2c_wr_ptr] = *data;`
156			`i2c_data[i2c_wr_ptr].data = 0x0000;`
157			`}`
158	36	rfajardo
159	53	ConX.	`i2c_pending_write = mode->read_write;`
160
161			`i2c_index = 0;`
162			`i2c_byte_transfer();`
163
164			`return mode->read_write+1;`
165	36	rfajardo	`}`

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[/] [minsoc/] [branches/] [verilator/] [sw/] [drivers/] [i2c.c] - Blame information for rev 163