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675dcc381c
- Move common code for USART (shared SPI / UART peripheral) to its
own file and allow sharing the USART peripheral to provide both
UART and SPI in round-robin fashion.
- Configure both UART and SPI bus via a `struct` in the board's
`periph_conf.h`
- this allows allocating the two UARTs as needed by the use case
- since both USARTs signals have a fixed connection to a single
GPIO, most configuration is moved to the CPU
- the board now only needs to decide which bus is provided by
which USART
Note: Sharing an USART used as UART requires cooperation from the app:
- If the UART is used in TX-only mode (no RX callback), the driver
will release the USART while not sending
- If the UART is used to also receive, the application needs to power
the UART down while not expecting something to send. An
`spi_acquire()` will be blocked while the UART is powered up.
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
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* Copyright (C) 2014 INRIA
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* 2015 Freie Universität Berlin
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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 boards_msb430
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* @{
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*
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* @file
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* @brief MSB-430 peripheral configuration
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*
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* @author Oliver Hahm <oliver.hahm@inria.fr>
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef PERIPH_CONF_H
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#define PERIPH_CONF_H
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#include "periph_cpu.h"
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#include "macros/units.h"
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#include "cfg_timer_a_smclk_b_aclk.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define CLOCK_CORECLOCK msp430_dco_freq
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/**
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* @brief Clock configuration
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*/
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static const msp430_clock_params_t clock_params = {
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.target_dco_frequency = MHZ(8),
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.lfxt1_frequency = 32768,
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.main_clock_source = MAIN_CLOCK_SOURCE_DCOCLK,
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.submain_clock_source = SUBMAIN_CLOCK_SOURCE_DCOCLK,
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.main_clock_divier = MAIN_CLOCK_DIVIDE_BY_1,
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.submain_clock_divier = SUBMAIN_CLOCK_DIVIDE_BY_1,
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.auxiliary_clock_divier = AUXILIARY_CLOCK_DIVIDE_BY_1,
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.has_r_osc = true,
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};
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/**
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* @name UART configuration
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* @{
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*/
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static const uart_conf_t uart_config[] = {
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{
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.uart = &usart1_as_uart,
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},
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};
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#define UART0_RX_ISR (USART1RX_VECTOR) /**< RX IRQ vector of UART 0 */
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#define UART0_TX_ISR (USART1TX_VECTOR) /**< TX IRQ vector of UART 0 */
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#define UART_NUMOF ARRAY_SIZE(uart_config)
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/** @} */
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/**
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* @name SPI configuration
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* @{
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*/
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static const spi_conf_t spi_config[] = {
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{
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/* beware of resource conflict with UART */
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.spi = &usart1_as_spi,
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},
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};
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#define SPI_NUMOF ARRAY_SIZE(spi_config)
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* PERIPH_CONF_H */
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/** @} */
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