RTEMS: bsps/arm/tms570/start/pinmux.c File Reference

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pinmux.c File Reference
Board Support Packages » ARM » TMS570

I/O Multiplexing Module (IOMM) basic support. More...

`#include <bsp/tms570.h>`
`#include <bsp/tms570-pinmux.h>`
`#include <bsp/irq.h>`

## Functions
void | tms570_bsp_pin_set_function (int pin_num, int pin_fnc)
| select desired function of pin/ball
void | tms570_bsp_pin_clear_function (int pin_num, int pin_fnc)
| clear connection between pin and specified peripherals/function
void | tms570_bsp_pin_config_one (uint32_t pin_num_and_fnc)
| configure one pin according to its function specification
void | tms570_bsp_pinmmr_config (const uint32_t *pinmmr_values, int reg_start, int reg_count)
| configure block or whole pin multiplexer

## Variables
uint32_t | tms570_bsp_pinmmr_kick_key0 = 0x83E70B13U
uint32_t | tms570_bsp_pinmmr_kick_key1 = 0x95A4F1E0U

## Detailed Description

I/O Multiplexing Module (IOMM) basic support.

## Function Documentation

## ◆ tms570_bsp_pin_clear_function()

void tms570_bsp_pin_clear_function | ( | int | pin_num,
|  | int | pin_fnc
| ) |  |

clear connection between pin and specified peripherals/function

This function switches off given connection and leaves rest of multiplexer setup intact.

Parameters

  [in] | pin_num | pin/ball identifier (index into pinmux array)
  [in] | pin_fnc | function number 0 .. 7, if value `TMS570_PIN_FNC_AUTO` is specified then pin function is extracted from pin_num argument

Return values

  Void |

## ◆ tms570_bsp_pin_config_one()

void tms570_bsp_pin_config_one | ( | uint32_t | pin_num_and_fnc | ) |

configure one pin according to its function specification

The function setups multiplexer to interconnect pin with specified function/peripheral. Predefined values for pins combined with function are in a format TMS570_BALL_ `column` `row` `function` (for example `TMS570_BALL_W3_SCIRX`). If the function can be connected to more pins then specification includes infomation which allows to disconnect alternative pin to peripheral input connection or switch input multiplexer to right pin.

Parameters

  [in] | pin_num_and_fnc | pin function descriptor is build by macro `TMS570_PIN_AND_FNC` which takes pin/pinmmr specification build by `TMS570_BALL_WITH_MMR` and function index in output multiplexer. If the peripheral can be connected to other input alternative then actual pin description and alternative to disconnected/reconnect are combined together by `TMS570_PIN_WITH_IN_ALT` macro. If clear of alternative connection is required then flag `TMS570_PIN_CLEAR_RQ_MASK` is ored to alternative description.

Return values

  Void |

## ◆ tms570_bsp_pin_set_function()

void tms570_bsp_pin_set_function | ( | int | pin_num,
|  | int | pin_fnc
| ) |  |

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.

Parameters

  [in] | pin_num | pin/ball identifier (index into pinmux array),
  [in] | pin_fnc | function number 0 .. 7, if value `TMS570_PIN_FNC_AUTO` is specified then pin function is extracted from pin_num argument

Return values

  Void |

## ◆ tms570_bsp_pinmmr_config()

void tms570_bsp_pinmmr_config | ( | const uint32_t * | pinmmr_values,
|  | int | reg_start,
|  | int | reg_count
| ) |  |

configure block or whole pin multiplexer

Function change multiplexer content. It is intended for initial chip setup and does not use locking. If complete reconfiguration is required at runtime then it is application responsibility to protect and serialize change with peripherals drivers and parallel calls

Parameters

  [in] | pinmmr_values | pointer to array with required multiplexer setup
  [in] | reg_start | starting register, this allows to configure non-consecutive registers groups found on some MCU family members
  [in] | reg_count | number of words in initialization array to set to corresponding registers

Return values

  Void |