blob: fed23fa9ec2af5e46748aaf8583237007e652f7d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/**
* @file pinmux.c
*
* @ingroup tms570
*
* @brief I/O Multiplexing Module (IOMM) basic support
*/
/*
* Copyright (c) 2015 Premysl Houdek <kom541000@gmail.com>
*
* Google Summer of Code 2014 at
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp/tms570.h>
#include <bsp/tms570-pinmux.h>
/**
* @brief select desired function of pin/ball
*
* The function setups multiplexer to interconnect pin with
* specified function/peripheral. Pin number is index into pinmux
* entries array. Predefined values for pins are in a format
* TMS570_BALL_<column><row> (for example TMS570_BALL_N19).
* The multiplexer allows to interconnect one pin to multiple
* signal sources/sinks in the theory but it is usually bad choice.
* The function sets only specified function and clears all other
* connections.
*
* @param[in] pin_num pin/ball identifier (index into pinmux array)
* @param[in] pin_fnc function number 0 .. 7, if value TMS570_PIN_FNC_AUTO
* is specified then pin function is extracted from
* pin_num argument
* @retval Void
*/
void
tms570_bsp_pin_set_function(int pin_num, int pin_fnc)
{
unsigned int pin_shift;
volatile uint32_t *pinmmrx;
if ( pin_fnc == TMS570_PIN_FNC_AUTO ) {
pin_fnc = (pin_num & TMS570_PIN_FNC_MASK) >> TMS570_PIN_FNC_SHIFT;
}
tms570_bsp_pin_to_pinmmrx(&pinmmrx, &pin_shift, pin_num);
*pinmmrx = (*pinmmrx & ~(0xff << pin_shift)) | (1 << (pin_fnc + pin_shift));
}
/**
* @brief clear connection between pin and specified peripherals/function
*
* This function switches off given connection and leaves rest
* of multiplexer setup intact.
*
* @param[in] pin_num pin/ball identifier (index into pinmux array)
* @param[in] pin_fnc function number 0 .. 7, if value TMS570_PIN_FNC_AUTO
* is specified then pin function is extracted from
* pin_num argument
* @retval Void
*/
void
tms570_bsp_pin_clear_function(int pin_num, int pin_fnc)
{
unsigned int pin_shift;
volatile uint32_t *pinmmrx;
if ( pin_fnc == TMS570_PIN_FNC_AUTO ) {
pin_fnc = (pin_num & TMS570_PIN_FNC_MASK) >> TMS570_PIN_FNC_SHIFT;
}
tms570_bsp_pin_to_pinmmrx(&pinmmrx, &pin_shift, pin_num);
*pinmmrx = *pinmmrx & ~(1 << (pin_fnc+pin_shift));
}
|
