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watch library: implement UART

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This commit is contained in:
Joey Castillo 2022-01-26 19:31:49 -05:00
parent 71ea3b9de9
commit 0c78fdf535
5 changed files with 150 additions and 40 deletions
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1
make.mk
View file

@ -95,6 +95,7 @@ SRCS += \
$(TOP)/watch-library/hardware/hal/src/hal_gpio.c \
$(TOP)/watch-library/hardware/hal/src/hal_i2c_m_sync.c \
$(TOP)/watch-library/hardware/hal/src/hal_spi_m_sync.c \
$(TOP)/watch-library/hardware/hal/src/hal_usart_sync.c \
$(TOP)/watch-library/hardware/hal/src/hal_init.c \
$(TOP)/watch-library/hardware/hal/src/hal_io.c \
$(TOP)/watch-library/hardware/hal/src/hal_slcd_sync.c \

3
watch-library/hardware/hw/driver_init.h
View file

@ -33,6 +33,7 @@ extern "C" {
#include <hal_ext_irq.h>
#include <hal_i2c_m_sync.h>
#include <hal_spi_m_sync.h>
#include <hal_usart_sync.h>
#include <hal_delay.h>
#include <hal_slcd_sync.h>
@ -40,6 +41,8 @@ extern struct adc_sync_descriptor ADC_0;
extern struct i2c_m_sync_desc I2C_0;
extern struct usart_sync_descriptor USART_0;
extern struct slcd_sync_descriptor SEGMENT_LCD_0;
void I2C_0_CLOCK_init(void);

98
watch-library/hardware/watch/watch_uart.c
View file

@ -22,6 +22,103 @@
* SOFTWARE.
*/
#include "watch_uart.h"
#include <string.h>
struct usart_sync_descriptor USART_0;
struct io_descriptor *uart_io;
void watch_enable_uart(const uint8_t tx_pin, const uint8_t rx_pin, uint32_t baud) {
SERCOM_USART_CTRLA_Type ctrla;
SERCOM_USART_CTRLB_Type ctrlb;
ctrla.reg = SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE(1);
ctrlb.reg = SERCOM_USART_CTRLB_CHSIZE(0);
MCLK->APBCMASK.reg |= MCLK_APBCMASK_SERCOM3;
GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN(0) | GCLK_PCHCTRL_CHEN;
while (0 == (GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg & GCLK_PCHCTRL_CHEN)) {
// wait
}
usart_sync_init(&USART_0, SERCOM3, (void *)NULL);
SERCOM3->USART.CTRLA.reg &= ~SERCOM_USART_CTRLA_ENABLE;
switch (tx_pin) {
case A2:
gpio_set_pin_direction(tx_pin, GPIO_DIRECTION_OUT);
gpio_set_pin_function(tx_pin, PINMUX_PB02C_SERCOM3_PAD0);
ctrla.reg |= SERCOM_USART_CTRLA_TXPO(0);
ctrlb.reg |= SERCOM_USART_CTRLB_TXEN;
break;
case A4:
gpio_set_pin_direction(tx_pin, GPIO_DIRECTION_OUT);
gpio_set_pin_function(tx_pin, PINMUX_PB00C_SERCOM3_PAD2);
ctrla.reg |= SERCOM_USART_CTRLA_TXPO(1);
ctrlb.reg |= SERCOM_USART_CTRLB_TXEN;
break;
default:
break;
}
switch (rx_pin) {
case A1:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB01C_SERCOM3_PAD3);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(3);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
case A2:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB02C_SERCOM3_PAD0);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(0);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
case A3:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB03C_SERCOM3_PAD1);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(1);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
case A4:
gpio_set_pin_direction(rx_pin, GPIO_DIRECTION_IN);
gpio_set_pin_function(rx_pin, PINMUX_PB00C_SERCOM3_PAD2);
ctrla.reg |= SERCOM_USART_CTRLA_RXPO(2);
ctrlb.reg |= SERCOM_USART_CTRLB_RXEN;
break;
default:
break;
}
SERCOM3->USART.CTRLA.reg = ctrla.reg;
SERCOM3->USART.CTRLB.reg = ctrlb.reg;
if (hri_usbdevice_get_CTRLA_ENABLE_bit(USB)) {
uint64_t br = 65536 - ((65536 * 16.0f * baud) / 8000000);
SERCOM3->USART.BAUD.reg = (uint16_t)br;
} else {
uint64_t br = 65536 - ((65536 * 16.0f * baud) / 4000000);
SERCOM3->USART.BAUD.reg = (uint16_t)br;
}
SERCOM3->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
usart_sync_enable(&USART_0);
usart_sync_get_io_descriptor(&USART_0, &uart_io);
}
void watch_uart_puts(char *s) {
io_write(uart_io, (uint8_t *)s, strlen(s));
}
char watch_uart_getc(void) {
uint8_t retval;
io_read(uart_io, &retval, 1);
return retval;
}
// Begin deprecated functions
/*
* UART methods are Copyright (c) 2014-2017, Alex Taradov <alex@taradov.com>
* All rights reserved.
@ -50,7 +147,6 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "watch_uart.h"
#include "peripheral_clk_config.h"
void watch_enable_debug_uart(uint32_t baud) {

39
watch-library/shared/watch/watch_uart.h
View file

@ -27,32 +27,49 @@
#include "watch.h"
/** @addtogroup debug Debug UART
* @brief This section covers functions related to the debug UART, available on
* pin D1 of the 9-pin connector.
* @warning These functions were used early on in development, before the TinyUSB
* CDC was implemented. You can now print debug messages to the USB console
* using printf, rendering this bit irrelevant. These methods will likely
* be refactored out in the future, in favor of a more full-featured UART
* on the nine-pin connector.
/** @addtogroup debug UART
* @brief This section covers functions related to the UART peripheral.
**/
/// @{
/** @brief Initializes the debug UART.
* @param tx_pin The pin the watch will use to transmit, or 0 for a receive-only UART.
* If specified, must be either A2 or A4.
* @param rx_pin The pin the watch will use to receive, or 0 for a transmit-only UART.
* If specified, must be A1, A2, A3 or A4 (pin A0 cannot receive UART data).
* @param baud The baud rate for the UART. A typical value is 19200.
*/
void watch_enable_uart(const uint8_t tx_pin, const uint8_t rx_pin, uint32_t baud);
/** @brief Transmits a string of bytes on the UART's TX pin.
* @param s A null-terminated string containing the bytes you wish to transmit.
*/
void watch_uart_puts(char *s);
/** @brief Receives a single byte from the UART's RX pin.
* @return the received byte.
* @note This method will block until a byte is received!
*/
char watch_uart_getc(void);
// Begin deprecated functions:
/** @brief Initializes the debug UART.
* @param baud The baud rate
*/
__attribute__((deprecated("Use printf to log debug messages over USB.")))
__attribute__((deprecated("Use watch_enable_uart to enable the UART.")))
void watch_enable_debug_uart(uint32_t baud);
/** @brief Outputs a single character on the debug UART.
* @param c The character you wish to output.
*/
__attribute__((deprecated("Use printf to log debug messages over USB.")))
__attribute__((deprecated("Use watch_uart_puts to print to the UART, or printf to log debug messages over USB.")))
void watch_debug_putc(char c);
/** @brief Outputs a string on the debug UART.
* @param s A null-terminated string.
*/
__attribute__((deprecated("Use printf to log debug messages over USB.")))
__attribute__((deprecated("Use watch_uart_puts to print to the UART, or printf to log debug messages over USB.")))
void watch_debug_puts(char *s);
/// @}
#endif

49
watch-library/simulator/watch/watch_uart.c
View file

@ -22,37 +22,30 @@
* SOFTWARE.
*/
/*
* UART methods are Copyright (c) 2014-2017, Alex Taradov <alex@taradov.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "watch_uart.h"
#include "peripheral_clk_config.h"
static bool tx_enable = false;
static bool rx_enable = false;
void watch_enable_uart(const uint8_t tx_pin, const uint8_t rx_pin, uint32_t baud) {
tx_enable = !!tx_pin;
rx_enable = !!rx_pin;
}
void watch_uart_puts(char *s) {
if (tx_enable) {
// TODO: hook up to UI
}
}
char watch_uart_getc(void) {
if (rx_enable) {
// TODO: hook up to UI
}
return 0;
}
void watch_enable_debug_uart(uint32_t baud) {}
void watch_debug_putc(char c) {}