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drivers/soft_uart: implement inverted TX & RX

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In the current implementation, RX is flank based, so it's entirely level
agnostic.
I still chose to include a SOFT_UART_FLAG_INVERT_RX flag for symmetry and
to allow for a possible future, sampling based implementation.
This commit is contained in:
Benjamin Valentin 2020-06-23 17:52:25 +02:00 committed by Benjamin Valentin
parent 5d1dddb3fc
commit b080d3da7a
2 changed files with 17 additions and 1 deletions
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11
drivers/include/soft_uart.h
View File

@ -37,6 +37,16 @@
extern "C" {
#endif
/**
* @brief invert the level of the TX signal
*/
#define SOFT_UART_FLAG_INVERT_TX 0x1
/**
* @brief invert the level of the RX signal
*/
#define SOFT_UART_FLAG_INVERT_RX 0x2
/**
* @brief Software UART port descriptor
*/
@ -47,6 +57,7 @@ typedef struct {
tim_t tx_timer; /**< Hardware timer used for TX */
uint32_t timer_freq; /**< Operating frequency of the timer.
Should be a multiple of baudrate */
uint8_t flags; /**< Soft UART flags */
} soft_uart_conf_t;
/**

7
drivers/soft_uart/include/soft_uart_params.h
View File

@ -41,13 +41,18 @@ extern "C" {
#ifndef SOFT_UART_PARAM_FREQ
#define SOFT_UART_PARAM_FREQ MHZ(1)
#endif
#ifndef SOFT_UART_PARAM_FLAGS
#define SOFT_UART_PARAM_FLAGS (0)
#endif
#ifndef SOFT_UART_PARAMS
#define SOFT_UART_PARAMS { .rx_pin = SOFT_UART_PARAM_RX, \
.tx_pin = SOFT_UART_PARAM_TX, \
.rx_timer = SOFT_UART_PARAM_TIMER_RX, \
.tx_timer = SOFT_UART_PARAM_TIMER_TX, \
.timer_freq = SOFT_UART_PARAM_FREQ }
.timer_freq = SOFT_UART_PARAM_FREQ, \
.flags = SOFT_UART_PARAM_FLAGS, \
}
#endif
/**