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bd929a3746
The QN908x has four FLEXCOMM interfaces that support a subset of UART, SPI or I2C each one. This patch adds generic support for dealing with the FLEXCOMM initialization and interrupts and adds a driver for RX/TX support in UART. With this patch is now possible to use a shell on the device over UART.
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*
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* Copyright (C) 2020 iosabi
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_qn908x
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*
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* @{
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*
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* @file
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* @brief Flexcomm interface functions.
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*
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* The FLEXCOMM blocks can operate in different modes such as UART, SPI and I2C,
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* but not all modules support all modes. These functions allow to initialize
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* and configure the FLEXCOMM, as well as route back the ISRs to the
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* corresponding module.
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*
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* @author iosabi <iosabi@protonmail.com>
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*/
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#ifndef FLEXCOMM_H
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#define FLEXCOMM_H
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#include <stdint.h>
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#include "periph_cpu.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Flexcomm PSELID values
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*
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* This value identifies the current function of a FLEXCOMM module.
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*/
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typedef enum {
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FLEXCOMM_ID_UART = 1, /**< UART mode. */
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FLEXCOMM_ID_SPI = 2, /**< SPI mode. */
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FLEXCOMM_ID_I2C = 3, /**< I2C mode. */
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} flexcom_pselid_t;
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/**
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* @brief Initialize a flexcomm module to operate as the selected mode.
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*
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* @returns -1 in case of error, otherwise returns the number of flexcomm
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* instance initialized, such as 2 for FLEXCOMM2.
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*/
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int flexcomm_init(FLEXCOMM_Type *dev, flexcom_pselid_t mode);
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/**
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* @brief Obtain the flexcomm block number (0-based) from the address.
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*
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* For example, the flexcomm block number of FLEXCOMM2, the pointer to the
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* FLEXCOMM_Type block is 2. If an invalid address is passed returns -1.
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*/
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int flexcomm_instance_from_addr(FLEXCOMM_Type *dev);
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#ifdef __cplusplus
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}
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#endif
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#endif /* FLEXCOMM_H */
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/** @} */
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