X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fstm%2Fao_serial_stm.c;h=c625471e4b1e9ce39caaf6b7c17a346be76e6953;hb=088ddbb177efc8be2fc467524dc1668553080d3b;hp=94138edc3f4bda884a07555584e8d0d962ca99fa;hpb=0b65402361f36a0c722977bcb63edb26fda0db28;p=fw%2Faltos diff --git a/src/stm/ao_serial_stm.c b/src/stm/ao_serial_stm.c index 94138edc..c625471e 100644 --- a/src/stm/ao_serial_stm.c +++ b/src/stm/ao_serial_stm.c @@ -3,7 +3,8 @@ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of @@ -16,6 +17,7 @@ */ #include +#include void ao_debug_out(char c) @@ -26,69 +28,123 @@ ao_debug_out(char c) stm_usart1.dr = c; } -static void +static int _ao_usart_tx_start(struct ao_stm_usart *usart) { - if (!ao_fifo_empty(usart->tx_fifo) && !usart->tx_started) - { - usart->tx_started = 1; - ao_fifo_remove(usart->tx_fifo, usart->reg->dr); + if (!ao_fifo_empty(usart->tx_fifo)) { +#if HAS_SERIAL_SW_FLOW + if (usart->gpio_cts && ao_gpio_get(usart->gpio_cts, usart->pin_cts, foo) == 1) { + ao_exti_enable(usart->gpio_cts, usart->pin_cts); + return 0; + } +#endif + if (usart->reg->sr & (1 << STM_USART_SR_TXE)) + { + usart->tx_running = 1; + usart->reg->cr1 |= (1 << STM_USART_CR1_TXEIE) | (1 << STM_USART_CR1_TCIE); + ao_fifo_remove(usart->tx_fifo, usart->reg->dr); + ao_wakeup(&usart->tx_fifo); + return 1; + } } + return 0; } +#if HAS_SERIAL_SW_FLOW static void -ao_usart_isr(struct ao_stm_usart *usart, int stdin) +_ao_usart_cts(struct ao_stm_usart *usart) { - uint32_t sr; - - sr = usart->reg->sr; - usart->reg->sr = 0; + if (_ao_usart_tx_start(usart)) + ao_exti_disable(usart->gpio_cts, usart->pin_cts); +} +#endif - if (sr & (1 << STM_USART_SR_RXNE)) { - char c = usart->reg->dr; - if (!ao_fifo_full(usart->rx_fifo)) - ao_fifo_insert(usart->rx_fifo, c); - ao_wakeup(&usart->rx_fifo); - if (stdin) - ao_wakeup(&ao_stdin_ready); - } - if (sr & (1 << STM_USART_SR_TC)) { - usart->tx_started = 0; - _ao_usart_tx_start(usart); - ao_wakeup(&usart->tx_fifo); +static void +_ao_usart_rx(struct ao_stm_usart *usart, int stdin) +{ + if (usart->reg->sr & (1 << STM_USART_SR_RXNE)) { + if (!ao_fifo_full(usart->rx_fifo)) { + ao_fifo_insert(usart->rx_fifo, usart->reg->dr); + ao_wakeup(&usart->rx_fifo); + if (stdin) + ao_wakeup(&ao_stdin_ready); +#if HAS_SERIAL_SW_FLOW + /* If the fifo is nearly full, turn off RTS and wait + * for it to drain a bunch + */ + if (usart->gpio_rts && ao_fifo_mostly(usart->rx_fifo)) { + ao_gpio_set(usart->gpio_rts, usart->pin_rts, usart->pin_rts, 1); + usart->rts = 0; + } +#endif + } else { + usart->reg->cr1 &= ~(1 << STM_USART_CR1_RXNEIE); + } } } -char -ao_usart_getchar(struct ao_stm_usart *usart) +static void +ao_usart_isr(struct ao_stm_usart *usart, int stdin) { - char c; - ao_arch_block_interrupts(); - while (ao_fifo_empty(usart->rx_fifo)) - ao_sleep(&usart->rx_fifo); - ao_fifo_remove(usart->rx_fifo, c); - ao_arch_release_interrupts(); - return c; + _ao_usart_rx(usart, stdin); + + if (!_ao_usart_tx_start(usart)) + usart->reg->cr1 &= ~(1<< STM_USART_CR1_TXEIE); + + if (usart->reg->sr & (1 << STM_USART_SR_TC)) { + usart->tx_running = 0; + usart->reg->cr1 &= ~(1 << STM_USART_CR1_TCIE); + if (usart->draining) { + usart->draining = 0; + ao_wakeup(&usart->tx_fifo); + } + } } -int -ao_usart_pollchar(struct ao_stm_usart *usart) +static int +_ao_usart_pollchar(struct ao_stm_usart *usart) { int c; - - ao_arch_block_interrupts(); + if (ao_fifo_empty(usart->rx_fifo)) c = AO_READ_AGAIN; else { uint8_t u; ao_fifo_remove(usart->rx_fifo,u); + if ((usart->reg->cr1 & (1 << STM_USART_CR1_RXNEIE)) == 0) { + if (ao_fifo_barely(usart->rx_fifo)) + usart->reg->cr1 |= (1 << STM_USART_CR1_RXNEIE); + } +#if HAS_SERIAL_SW_FLOW + /* If we've cleared RTS, check if there's space now and turn it back on */ + if (usart->gpio_rts && usart->rts == 0 && ao_fifo_barely(usart->rx_fifo)) { + ao_gpio_set(usart->gpio_rts, usart->pin_rts, foo, 0); + usart->rts = 1; + } +#endif c = u; } - ao_arch_release_interrupts(); return c; } -void +static char +ao_usart_getchar(struct ao_stm_usart *usart) +{ + int c; + ao_arch_block_interrupts(); + while ((c = _ao_usart_pollchar(usart)) == AO_READ_AGAIN) + ao_sleep(&usart->rx_fifo); + ao_arch_release_interrupts(); + return (char) c; +} + +static inline uint8_t +_ao_usart_sleep_for(struct ao_stm_usart *usart, uint16_t timeout) +{ + return ao_sleep_for(&usart->rx_fifo, timeout); +} + +static void ao_usart_putchar(struct ao_stm_usart *usart, char c) { ao_arch_block_interrupts(); @@ -99,12 +155,14 @@ ao_usart_putchar(struct ao_stm_usart *usart, char c) ao_arch_release_interrupts(); } -void +static void ao_usart_drain(struct ao_stm_usart *usart) { ao_arch_block_interrupts(); - while (!ao_fifo_empty(usart->tx_fifo)) + while (!ao_fifo_empty(usart->tx_fifo) || usart->tx_running) { + usart->draining = 1; ao_sleep(&usart->tx_fifo); + } ao_arch_release_interrupts(); } @@ -123,17 +181,20 @@ static const struct { [AO_SERIAL_SPEED_57600] = { AO_PCLK1 / 57600 }, + [AO_SERIAL_SPEED_115200] = { + AO_PCLK1 / 115200 + }, }; -void +static void ao_usart_set_speed(struct ao_stm_usart *usart, uint8_t speed) { - if (speed > AO_SERIAL_SPEED_57600) + if (speed > AO_SERIAL_SPEED_115200) return; usart->reg->brr = ao_usart_speeds[speed].brr; } -void +static void ao_usart_init(struct ao_stm_usart *usart) { usart->reg->cr1 = ((0 << STM_USART_CR1_OVER8) | @@ -144,7 +205,7 @@ ao_usart_init(struct ao_stm_usart *usart) (0 << STM_USART_CR1_PS) | (0 << STM_USART_CR1_PEIE) | (0 << STM_USART_CR1_TXEIE) | - (1 << STM_USART_CR1_TCIE) | + (0 << STM_USART_CR1_TCIE) | (1 << STM_USART_CR1_RXNEIE) | (0 << STM_USART_CR1_IDLEIE) | (1 << STM_USART_CR1_TE) | @@ -179,6 +240,15 @@ ao_usart_init(struct ao_stm_usart *usart) ao_usart_set_speed(usart, AO_SERIAL_SPEED_9600); } +#if HAS_SERIAL_HW_FLOW +static void +ao_usart_set_flow(struct ao_stm_usart *usart) +{ + usart->reg->cr3 |= ((1 << STM_USART_CR3_CTSE) | + (1 << STM_USART_CR3_RTSE)); +} +#endif + #if HAS_SERIAL_1 struct ao_stm_usart ao_stm_usart1; @@ -198,14 +268,27 @@ ao_serial1_putchar(char c) } int -ao_serial1_pollchar(void) +_ao_serial1_pollchar(void) +{ + return _ao_usart_pollchar(&ao_stm_usart1); +} + +uint8_t +_ao_serial1_sleep_for(uint16_t timeout) +{ + return _ao_usart_sleep_for(&ao_stm_usart1, timeout); +} + +void +ao_serial1_drain(void) { - return ao_usart_pollchar(&ao_stm_usart1); + ao_usart_drain(&ao_stm_usart1); } void ao_serial1_set_speed(uint8_t speed) { + ao_usart_drain(&ao_stm_usart1); ao_usart_set_speed(&ao_stm_usart1, speed); } #endif /* HAS_SERIAL_1 */ @@ -229,23 +312,45 @@ ao_serial2_putchar(char c) } int -ao_serial2_pollchar(void) +_ao_serial2_pollchar(void) +{ + return _ao_usart_pollchar(&ao_stm_usart2); +} + +uint8_t +_ao_serial2_sleep_for(uint16_t timeout) { - return ao_usart_pollchar(&ao_stm_usart2); + return _ao_usart_sleep_for(&ao_stm_usart2, timeout); +} + +void +ao_serial2_drain(void) +{ + ao_usart_drain(&ao_stm_usart2); } void ao_serial2_set_speed(uint8_t speed) { + ao_usart_drain(&ao_stm_usart2); ao_usart_set_speed(&ao_stm_usart2, speed); } + +#if HAS_SERIAL_SW_FLOW +void +ao_serial2_cts(void) +{ + _ao_usart_cts(&ao_stm_usart2); +} +#endif + #endif /* HAS_SERIAL_2 */ #if HAS_SERIAL_3 struct ao_stm_usart ao_stm_usart3; -void stm_usart3_isr(void) { ao_usart_isr(&ao_stm_usart3, USE_SERIAL_2_STDIN); } +void stm_usart3_isr(void) { ao_usart_isr(&ao_stm_usart3, USE_SERIAL_3_STDIN); } char ao_serial3_getchar(void) @@ -260,18 +365,53 @@ ao_serial3_putchar(char c) } int -ao_serial3_pollchar(void) +_ao_serial3_pollchar(void) +{ + return _ao_usart_pollchar(&ao_stm_usart3); +} + +uint8_t +_ao_serial3_sleep_for(uint16_t timeout) { - return ao_usart_pollchar(&ao_stm_usart3); + return _ao_usart_sleep_for(&ao_stm_usart3, timeout); } void ao_serial3_set_speed(uint8_t speed) { + ao_usart_drain(&ao_stm_usart3); ao_usart_set_speed(&ao_stm_usart3, speed); } + +void +ao_serial3_drain(void) +{ + ao_usart_drain(&ao_stm_usart3); +} #endif /* HAS_SERIAL_3 */ +#if HAS_SERIAL_SW_FLOW +static void +ao_serial_set_sw_rts_cts(struct ao_stm_usart *usart, + void (*isr)(void), + struct stm_gpio *port_rts, + int pin_rts, + struct stm_gpio *port_cts, + int pin_cts) +{ + /* Pull RTS low to note that there's space in the FIFO + */ + ao_enable_output(port_rts, pin_rts, foo, 0); + usart->gpio_rts = port_rts; + usart->pin_rts = pin_rts; + usart->rts = 1; + + ao_exti_setup(port_cts, pin_cts, AO_EXTI_MODE_FALLING|AO_EXTI_PRIORITY_MED, isr); + usart->gpio_cts = port_cts; + usart->pin_cts = pin_cts; +} +#endif + void ao_serial_init(void) { @@ -304,9 +444,9 @@ ao_serial_init(void) ao_usart_init(&ao_stm_usart1); stm_nvic_set_enable(STM_ISR_USART1_POS); - stm_nvic_set_priority(STM_ISR_USART1_POS, 4); -#if USE_SERIAL_1_STDIN - ao_add_stdio(ao_serial1_pollchar, + stm_nvic_set_priority(STM_ISR_USART1_POS, AO_STM_NVIC_MED_PRIORITY); +#if USE_SERIAL_1_STDIN && !DELAY_SERIAL_1_STDIN + ao_add_stdio(_ao_serial1_pollchar, ao_serial1_putchar, NULL); #endif @@ -324,26 +464,45 @@ ao_serial_init(void) stm_afr_set(&stm_gpioa, 2, STM_AFR_AF7); stm_afr_set(&stm_gpioa, 3, STM_AFR_AF7); +# if USE_SERIAL_2_FLOW +# if USE_SERIAL_2_SW_FLOW + ao_serial_set_sw_rts_cts(&ao_stm_usart2, + ao_serial2_cts, + SERIAL_2_PORT_RTS, + SERIAL_2_PIN_RTS, + SERIAL_2_PORT_CTS, + SERIAL_2_PIN_CTS); +# else + stm_afr_set(&stm_gpioa, 0, STM_AFR_AF7); + stm_afr_set(&stm_gpioa, 1, STM_AFR_AF7); +# endif +# endif #else #if SERIAL_2_PD5_PD6 stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIODEN); stm_afr_set(&stm_gpiod, 5, STM_AFR_AF7); stm_afr_set(&stm_gpiod, 6, STM_AFR_AF7); +#if USE_SERIAL_2_FLOW +#error "Don't know how to set flowcontrol for serial 2 on PD" +#endif #else #error "No SERIAL_2 port configuration specified" -#endif +#endif #endif /* Enable USART */ stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_USART2EN); ao_stm_usart2.reg = &stm_usart2; ao_usart_init(&ao_stm_usart2); +#if USE_SERIAL_2_FLOW && !USE_SERIAL_2_SW_FLOW + ao_usart_set_flow(&ao_stm_usart2); +#endif stm_nvic_set_enable(STM_ISR_USART2_POS); - stm_nvic_set_priority(STM_ISR_USART2_POS, 4); -#if USE_SERIAL_2_STDIN - ao_add_stdio(ao_serial2_pollchar, + stm_nvic_set_priority(STM_ISR_USART2_POS, AO_STM_NVIC_MED_PRIORITY); +#if USE_SERIAL_2_STDIN && !DELAY_SERIAL_2_STDIN + ao_add_stdio(_ao_serial2_pollchar, ao_serial2_putchar, NULL); #endif @@ -385,13 +544,11 @@ ao_serial_init(void) ao_usart_init(&ao_stm_usart3); stm_nvic_set_enable(STM_ISR_USART3_POS); - stm_nvic_set_priority(STM_ISR_USART3_POS, 4); -#if USE_SERIAL_3_STDIN - ao_add_stdio(ao_serial3_pollchar, + stm_nvic_set_priority(STM_ISR_USART3_POS, AO_STM_NVIC_MED_PRIORITY); +#if USE_SERIAL_3_STDIN && !DELAY_SERIAL_3_STDIN + ao_add_stdio(_ao_serial3_pollchar, ao_serial3_putchar, NULL); #endif #endif } - -