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[/] [hf-risc/] [trunk/] [software/] [lib/] [mcp23s17.c] - Blame information for rev 13

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/* file:          mcp23s17.c
 * description:   Microchip mcp23s17 chip driver
 * date:          09/2015
 * author:        Sergio Johann Filho <sergio.filho@pucrs.br>
 */
 
#include <hf-risc.h>
#include <mcp23s17.h>
 
void mcp23s17_dir(uint8_t device, uint8_t bank, uint8_t reg){
        spi_start();
        spi_sendrecv(MCP23x17_ADDR | ((device & 0x07) << 1));
        if (bank)
                spi_sendrecv(MCP23x17_IODIRB);
        else
                spi_sendrecv(MCP23x17_IODIRA);
        spi_sendrecv(reg);
        spi_stop();
}
 
uint8_t mcp23s17_read(uint8_t device, uint8_t bank){
        uint8_t reg;
 
        spi_start();
        spi_sendrecv(MCP23x17_ADDR | ((device & 0x07) << 1) | 0x01);
        if (bank)
                spi_sendrecv(MCP23x17_GPIOB);
        else
                spi_sendrecv(MCP23x17_GPIOA);
        reg = spi_sendrecv(0);
        spi_stop();
 
        return reg;
}
 
void mcp23s17_write(uint8_t device, uint8_t bank, uint8_t reg){
        spi_start();
        spi_sendrecv(MCP23x17_ADDR | ((device & 0x07) << 1));
        if (bank)
                spi_sendrecv(MCP23x17_GPIOB);
        else
                spi_sendrecv(MCP23x17_GPIOA);
        spi_sendrecv(reg);
        spi_stop();
}
 
void mcp23s17_inten(uint8_t device, uint8_t bank, uint8_t reg){
        spi_start();
        spi_sendrecv(MCP23x17_ADDR | ((device & 0x07) << 1));
        if (bank)
                spi_sendrecv(MCP23x17_GPINTENB);
        else
                spi_sendrecv(MCP23x17_GPINTENA);
        spi_sendrecv(reg);
        spi_stop();
}
 
void mcp23s17_init(uint8_t device, uint8_t portdir_a, uint8_t portdir_b){
        uint8_t byte;
 
        spi_setup();
 
        // configure device, enable device addressing
        spi_start();
        spi_sendrecv(MCP23x17_ADDR | ((device & 0x07) << 1));
        spi_sendrecv(MCP23x17_IOCON);
        spi_sendrecv(0x00
                        | (0 << MCP23x17_IOCON_BANK)
                        | (0 << MCP23x17_IOCON_MIRROR)
                        | (0 << MCP23x17_IOCON_SEQOP)
                        | (0 << MCP23x17_IOCON_DISSLW)
                        | (1 << MCP23x17_IOCON_HAEN)
                        | (0 << MCP23x17_IOCON_ODR)
                        | (1 << MCP23x17_IOCON_INTPOL)
        );
        spi_stop();
 
        // set pin direction on both ports
        mcp23s17_dir(device, 0, portdir_a);
        mcp23s17_dir(device, 1, portdir_b);
        mcp23s17_write(device, 0, 0x00);
        mcp23s17_write(device, 1, 0x00);
 
        // enable weak internal pull-ups on both ports
        spi_start();
        spi_sendrecv(MCP23x17_ADDR | ((device & 0x07) << 1));
        spi_sendrecv(MCP23x17_GPPUA);
        spi_sendrecv(0xff);
        spi_sendrecv(0xff);
        spi_stop();
}

Line No.	Rev	Author	Line
1	13	serginhofr	`/* file: mcp23s17.c`
2			`* description: Microchip mcp23s17 chip driver`
3			`* date: 09/2015`
4			`* author: Sergio Johann Filho <sergio.filho@pucrs.br>`
5			`*/`
6
7			`#include <hf-risc.h>`
8			`#include <mcp23s17.h>`
9
10			`void mcp23s17_dir(uint8_t device, uint8_t bank, uint8_t reg){`
11			`spi_start();`
12			`spi_sendrecv(MCP23x17_ADDR \| ((device & 0x07) << 1));`
13			`if (bank)`
14			`spi_sendrecv(MCP23x17_IODIRB);`
15			`else`
16			`spi_sendrecv(MCP23x17_IODIRA);`
17			`spi_sendrecv(reg);`
18			`spi_stop();`
19			`}`
20
21			`uint8_t mcp23s17_read(uint8_t device, uint8_t bank){`
22			`uint8_t reg;`
23
24			`spi_start();`
25			`spi_sendrecv(MCP23x17_ADDR \| ((device & 0x07) << 1) \| 0x01);`
26			`if (bank)`
27			`spi_sendrecv(MCP23x17_GPIOB);`
28			`else`
29			`spi_sendrecv(MCP23x17_GPIOA);`
30			`reg = spi_sendrecv(0);`
31			`spi_stop();`
32
33			`return reg;`
34			`}`
35
36			`void mcp23s17_write(uint8_t device, uint8_t bank, uint8_t reg){`
37			`spi_start();`
38			`spi_sendrecv(MCP23x17_ADDR \| ((device & 0x07) << 1));`
39			`if (bank)`
40			`spi_sendrecv(MCP23x17_GPIOB);`
41			`else`
42			`spi_sendrecv(MCP23x17_GPIOA);`
43			`spi_sendrecv(reg);`
44			`spi_stop();`
45			`}`
46
47			`void mcp23s17_inten(uint8_t device, uint8_t bank, uint8_t reg){`
48			`spi_start();`
49			`spi_sendrecv(MCP23x17_ADDR \| ((device & 0x07) << 1));`
50			`if (bank)`
51			`spi_sendrecv(MCP23x17_GPINTENB);`
52			`else`
53			`spi_sendrecv(MCP23x17_GPINTENA);`
54			`spi_sendrecv(reg);`
55			`spi_stop();`
56			`}`
57
58			`void mcp23s17_init(uint8_t device, uint8_t portdir_a, uint8_t portdir_b){`
59			`uint8_t byte;`
60
61			`spi_setup();`
62
63			`// configure device, enable device addressing`
64			`spi_start();`
65			`spi_sendrecv(MCP23x17_ADDR \| ((device & 0x07) << 1));`
66			`spi_sendrecv(MCP23x17_IOCON);`
67			`spi_sendrecv(0x00`
68			`\| (0 << MCP23x17_IOCON_BANK)`
69			`\| (0 << MCP23x17_IOCON_MIRROR)`
70			`\| (0 << MCP23x17_IOCON_SEQOP)`
71			`\| (0 << MCP23x17_IOCON_DISSLW)`
72			`\| (1 << MCP23x17_IOCON_HAEN)`
73			`\| (0 << MCP23x17_IOCON_ODR)`
74			`\| (1 << MCP23x17_IOCON_INTPOL)`
75			`);`
76			`spi_stop();`
77
78			`// set pin direction on both ports`
79			`mcp23s17_dir(device, 0, portdir_a);`
80			`mcp23s17_dir(device, 1, portdir_b);`
81			`mcp23s17_write(device, 0, 0x00);`
82			`mcp23s17_write(device, 1, 0x00);`
83
84			`// enable weak internal pull-ups on both ports`
85			`spi_start();`
86			`spi_sendrecv(MCP23x17_ADDR \| ((device & 0x07) << 1));`
87			`spi_sendrecv(MCP23x17_GPPUA);`
88			`spi_sendrecv(0xff);`
89			`spi_sendrecv(0xff);`
90			`spi_stop();`
91			`}`

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[/] [hf-risc/] [trunk/] [software/] [lib/] [mcp23s17.c] - Blame information for rev 13