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cpu/stm32_common: init RX pin only if RX is active

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This commit is contained in:
Hauke Petersen 2017-02-09 10:42:03 +01:00
parent b0def58927
commit c3f54e9d7f
1 changed files with 10 additions and 5 deletions
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15
cpu/stm32_common/periph/uart.c
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@ -1,5 +1,5 @@
/*
* Copyright (C) 2014-2016 Freie Universität Berlin
* Copyright (C) 2014-2017 Freie Universität Berlin
* Copyright (C) 2016 OTA keys
*
* This file is subject to the terms and conditions of the GNU Lesser
@ -8,7 +8,7 @@
*/
/**
* @ingroup cpu_stm32f2
* @ingroup cpu_stm32_common
* @{
*
* @file
@ -56,8 +56,7 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
isr_ctx[uart].rx_cb = rx_cb;
isr_ctx[uart].arg = arg;
/* configure RX and TX pin */
gpio_init(uart_config[uart].rx_pin, GPIO_IN);
/* configure TX pin */
gpio_init(uart_config[uart].tx_pin, GPIO_OUT);
/* set TX pin high to avoid garbage during further initialization */
gpio_set(uart_config[uart].tx_pin);
@ -65,8 +64,14 @@ int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
gpio_init_af(uart_config[uart].tx_pin, GPIO_AF_OUT_PP);
#else
gpio_init_af(uart_config[uart].tx_pin, uart_config[uart].tx_af);
gpio_init_af(uart_config[uart].rx_pin, uart_config[uart].rx_af);
#endif
/* configure RX pin */
if (rx_cb) {
gpio_init(uart_config[uart].rx_pin, GPIO_IN);
#ifndef CPU_FAM_STM32F1
gpio_init_af(uart_config[uart].rx_pin, uart_config[uart].rx_af);
#endif
}
/* enable the clock */
periph_clk_en(uart_config[uart].bus, uart_config[uart].rcc_mask);