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BV RS485: add timer for baud rate detection

This commit is contained in:
King Kévin 2018-07-13 18:32:15 +02:00
parent 6b8255c5d9
commit 1fe300335d
1 changed files with 16 additions and 0 deletions
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16
lib/busvoodoo_rs485.c
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@ -24,6 +24,7 @@
#include <string.h> // string utilities
/* STM32 (including CM3) libraries */
#include <libopencm3/cm3/nvic.h> // interrupt utilities
#include <libopencm3/stm32/gpio.h> // general purpose input output library
#include <libopencm3/stm32/rcc.h> // real-time control clock library
#include <libopencm3/stm32/usart.h> // USART utilities
@ -67,6 +68,9 @@ static void busvoodoo_rs485_receive_disable(void)
gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to disable RS-485 transceiver receiver
}
#define BUSVOODOO_RS485_RX_TIMER 2 /**< timer ID to capture RX edges */
#define BUSVOODOO_RS485_RX_CHANNEL 4 /**< channel ID used as input capture to capture RX edges */
/** RS-485 specific methods that will be called by the generic methods */
static const struct busvoodoo_uart_generic_specific_t busvoodoo_uart_generic_rs485 = {
.usart = USART(BUSVOODOO_RS485_USART),
@ -90,6 +94,18 @@ static const struct busvoodoo_uart_generic_specific_t busvoodoo_uart_generic_rs4
.cts_port = 0,
.cts_pin = 0,
.cts_rcc = 0,
.timer = TIM(BUSVOODOO_RS485_RX_TIMER),
.timer_rcc = RCC_TIM(BUSVOODOO_RS485_RX_TIMER),
.timer_port = TIM_CH_PORT(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
.timer_port_rcc = RCC_TIM_CH(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
.timer_pin = TIM_CH_PIN(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
.timer_ic = TIM_IC(BUSVOODOO_RS485_RX_CHANNEL),
.timer_ic_in_ti = TIM_IC_IN_TI(BUSVOODOO_RS485_RX_CHANNEL),
.timer_sr_ccif = TIM_SR_CCIF(BUSVOODOO_RS485_RX_CHANNEL),
.timer_sr_ccof = TIM_SR_CCOF(BUSVOODOO_RS485_RX_CHANNEL),
.timer_ccr = &TIM_CCR(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
.timer_dier_ccie = TIM_DIER_CCIE(BUSVOODOO_RS485_RX_CHANNEL),
.timer_nvic_irq = NVIC_TIM_IRQ(BUSVOODOO_RS485_RX_TIMER),
};
/** setup RS-485 mode