diff --git a/boards/arm/stm32/stm32f4discovery/README.txt b/boards/arm/stm32/stm32f4discovery/README.txt index e893717a83..dba0004eca 100644 --- a/boards/arm/stm32/stm32f4discovery/README.txt +++ b/boards/arm/stm32/stm32f4discovery/README.txt @@ -38,6 +38,7 @@ Contents - Quadrature Encoder - FPU - STM32F4DIS-BB + - RTC DS1307 - SSD1289 - UG-2864AMBAG01 / UG-2864HSWEG01 - HCI UART @@ -417,6 +418,52 @@ On-board PIO usage: PC10 DAT2 ---------- ------------- ------------------------------ +RTC DS1307 +========== + +It is possible to use a low cost extern DS1307 RTC to keep date and time +always updated. These DS1307 RTC modules come with a 3V button battery, then +even when the board is turned OFF the Date/Time registers keep running. + +You can connect the module this way (STM32F4Discovery to DS1307 board): GND +to GND; 5V to VCC; PB9 to SDA; PB6 to SCL. In the NuttX menuconfig you need +to enable these options: + +System Type ---> + STM32 Peripheral Support ---> + [*] I2C1 + +Device Drivers ---> + Timer Driver Support ---> + [*] RTC Driver Support ---> + -*- Date/Time RTC Support + [*] External RTC Support + [*] DS130x/DS323x RTC Driver + Maxim Integrated RTC (DS1307) ---> + (100000) DS1307/DS323x I2C frequency + +Application Configuration ---> + NSH Library ---> + Disable Individual commands ---> + [ ] Disable date ( <-- Deselect ) + +It is also a good idea to enable the DEBUG to RTC initially, you will see: + +ABCDF +stm32_ds1307_init: Initialize I2C1 +stm32_ds1307_init: Bind the DS1307 RTC driver to I2C1 +rtc_dumptime: Returning: +rtc_dumptime: tm_sec: 00000039 +rtc_dumptime: tm_min: 00000001 +rtc_dumptime: tm_hour: 00000009 +rtc_dumptime: tm_mday: 00000016 +rtc_dumptime: tm_mon: 00000008 +rtc_dumptime: tm_year: 00000077 + +NuttShell (NSH) +nsh> date +Sep 22 09:01:58 2019 + SSD1289 ======= diff --git a/boards/arm/stm32/stm32f4discovery/src/Makefile b/boards/arm/stm32/stm32f4discovery/src/Makefile index 641af544ee..40c82487a1 100644 --- a/boards/arm/stm32/stm32f4discovery/src/Makefile +++ b/boards/arm/stm32/stm32f4discovery/src/Makefile @@ -125,6 +125,10 @@ ifeq ($(CONFIG_RGBLED),y) CSRCS += stm32_rgbled.c endif +ifeq ($(CONFIG_RTC_DS1307),y) +CSRCS += stm32_ds1307.c +endif + ifeq ($(CONFIG_PWM),y) CSRCS += stm32_pwm.c endif diff --git a/boards/arm/stm32/stm32f4discovery/src/stm32_bringup.c b/boards/arm/stm32/stm32f4discovery/src/stm32_bringup.c index 874b77afba..bcce36d0bf 100644 --- a/boards/arm/stm32/stm32f4discovery/src/stm32_bringup.c +++ b/boards/arm/stm32/stm32f4discovery/src/stm32_bringup.c @@ -329,6 +329,15 @@ int stm32_bringup(void) } #endif +#ifdef CONFIG_RTC_DS1307 + ret = stm32_ds1307_init(); + if (ret < 0) + { + syslog(LOG_ERR, "Failed to initialize DS1307 RTC driver: %d\n", ret); + return ret; + } +#endif + #ifdef HAVE_RTC_DRIVER /* Instantiate the STM32 lower-half RTC driver */ diff --git a/boards/arm/stm32/stm32f4discovery/src/stm32_ds1307.c b/boards/arm/stm32/stm32f4discovery/src/stm32_ds1307.c new file mode 100644 index 0000000000..fae6118f27 --- /dev/null +++ b/boards/arm/stm32/stm32f4discovery/src/stm32_ds1307.c @@ -0,0 +1,128 @@ +/**************************************************************************** + * boards/arm/stm32/stm32f4discovery/src/stm32_ds1307.c + * + * Copyright (C) 2019 Alan Carvalho de Assis. All rights reserved. + * Author: Alan Carvalho de Assis + * + * 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. Neither the name NuttX nor the names of its contributors may 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 OWNER 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include + +#include +#include + +#include +#include +#include + +#include "stm32.h" +#include "stm32_i2c.h" +#include "stm32f4discovery.h" + +#if defined(CONFIG_I2C) && defined(CONFIG_RTC_DS1307) + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +#define DS1307_I2C_ADDR 0x6f /* DS1307 I2C Address */ +#define DS1307_I2C_BUS 1 /* DS1307 is on I2C1 */ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: stm32_ds1307_init + * + * Description: + * Initialize and configure the DS1307 RTC + * + ****************************************************************************/ + +int stm32_ds1307_init(void) +{ + FAR struct i2c_master_s *i2c; + static bool initialized = false; + int ret; + + /* Have we already initialized? */ + + if (!initialized) + { + /* No.. Get the I2C bus driver */ + + rtcinfo("Initialize I2C%d\n", DS1307_I2C_BUS); + i2c = stm32_i2cbus_initialize(DS1307_I2C_BUS); + if (!i2c) + { + rtcerr("ERROR: Failed to initialize I2C%d\n", DS1307_I2C_BUS); + return -ENODEV; + } + + /* Now bind the I2C interface to the DS1307 RTC driver */ + + rtcinfo("Bind the DS1307 RTC driver to I2C%d\n", DS1307_I2C_BUS); + ret = dsxxxx_rtc_initialize(i2c); + if (ret < 0) + { + rtcerr("ERROR: Failed to bind I2C%d to the DS1307 RTC driver\n", + DS1307_I2C_BUS); + return -ENODEV; + } + +#ifdef CONFIG_I2C_DRIVER + /* Register the I2C to get the "nsh> i2c bus" command working */ + + ret = i2c_register(i2c, DS1307_I2C_BUS); + if (ret < 0) + { + rtcerr("ERROR: Failed to register I2C%d driver: %d\n", bus, ret); + return -ENODEV; + } +#endif + + /* Synchronize the system time to the RTC time */ + + clock_synchronize(); + + /* Now we are initialized */ + + initialized = true; + } + + return OK; +} + +#endif /* CONFIG_I2C && CONFIG_RTC_DS1307 */ diff --git a/boards/arm/stm32/stm32f4discovery/src/stm32f4discovery.h b/boards/arm/stm32/stm32f4discovery/src/stm32f4discovery.h index 54eaf261c8..08ca532fce 100644 --- a/boards/arm/stm32/stm32f4discovery/src/stm32f4discovery.h +++ b/boards/arm/stm32/stm32f4discovery/src/stm32f4discovery.h @@ -216,6 +216,7 @@ #endif /* STM32F4 Discovery GPIOs **************************************************/ + /* LEDs */ #define GPIO_LED1 (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_50MHz|\ @@ -497,6 +498,18 @@ int nunchuck_initialize(FAR char *devname); int stm32_max7219init(FAR const char *devpath); #endif +/**************************************************************************** + * Name: stm32_ds1307_init + * + * Description: + * Initialize and register the DS1307 RTC + * + ****************************************************************************/ + +#ifdef CONFIG_RTC_DS1307 +int stm32_ds1307_init(void); +#endif + /**************************************************************************** * Name: stm32_st7032init *