Configuration

Name

Configuration -- Platform-specific Configuration Options

Overview

The STM3210C-EVAL board platform HAL package is loaded automatically when eCos is configured for an stm3210c_eval target. It should never be necessary to load this package explicitly. Unloading the package should only happen as a side effect of switching target hardware.

Startup

The STM3210C-EVAL board platform HAL package supports three separate startup types:

RAM

This is the startup type which is normally used during application development. The board has GDB stubs programmed into internal Flash at location 0x08000000 and uses internal RAM at location 0x20000000. arm-eabi-gdb is then used to load a RAM startup application into memory from 0x20001000 and debug it. It is assumed that the hardware has already been initialized by the stubs. By default the application will use the eCos virtual vectors mechanism to obtain services from the stubs, including diagnostic output.

ROM

This startup type can be used for finished applications which will be programmed into internal ROM at location 0x08000000. Data and BSS will be put into internal RAM starting from 0x20000400. The application will be self-contained with no dependencies on services provided by other software. The program expects to boot from reset with ROM mapped at location zero. It will then transfer control to the 0x08000000 region. eCos startup code will perform all necessary hardware initialization.

JTAG

This is the startup type used to build applications that are loaded via a JTAG interface. The application will be self-contained with no dependencies on services provided by other software. The program expects to be loaded from 0x20000400 and entered at that address. eCos startup code will perform all necessary hardware initialization.

Monitors and Virtual Vectors

If the application is intended to act as a ROM monitor, providing services for other applications, then the configuration option CYGSEM_HAL_ROM_MONITOR should be set. Typically this option is set only when building the Stubrom.

If the application is supposed to make use of services provided by a ROM monitor, via the eCos virtual vector mechanism, then the configuration option CYGSEM_HAL_USE_ROM_MONITOR should be set. By default this option is enabled when building for a RAM startup, disabled otherwise. It can be manually disabled for a RAM startup, making the application self-contained, as a testing step before switching to ROM startup.

If the application does not rely on a ROM monitor for diagnostic services then serial port 0 will be claimed for HAL diagnostics.

UART Serial Driver

The STM3210C-EVAL board uses the STM32's internal UART serial support. As well as the polled HAL diagnostic interface, there is also a CYGPKG_IO_SERIAL_CORTEXM_STM32 package which contains all the code necessary to support interrupt-driven operation with greater functionality. All five UARTs can be supported by this driver, although only USART1 is actually routed to an external connector. Note that it is not recommended to enable this driver on the port used for HAL diagnostic I/O. This driver is not active until the CYGPKG_IO_SERIAL_DEVICES configuration option within the generic serial driver support package CYGPKG_IO_SERIAL is enabled in the configuration.

Ethernet Driver

The STM3210C-EVAL board is fitted with an Ethernet port connected via a DP83848 PHY to the STM32's on-chip Ethernet MAC. This is supported in eCosPro with a driver for the lwIP networking stack, contained in the package CYGPKG_DEVS_ETH_CORTEXM_STM32. At the present time it only supports the lwIP networking stack, and cannot be used for either the BSD networking stack, nor RedBoot.

The driver will be inactive (not built and greyed out in the eCos Configuration Tool) unless the platform HAL option "STM32 Ethernet Support" (CYGPKG_HAL_CORTEXM_STM32_STM3210C_EVAL_ETH0) is enabled. This option in turn is only active if the "Common Ethernet support" (CYGPKG_IO_ETH_DRIVERS) package is included in your configuration. As the STM32 ethernet driver is an lwIP-only driver, it is most appropriate to choose the lwip_eth template as a starting point when choosing an eCos configuration, which will cause the necessary packages to be automatically included.

The STM32 ethernet driver defines a further configuration option "Use MCO as PHY clock" (CYGHWR_DEVS_ETH_CORTEXM_STM32_PHY_CLK_MCO) which indicates whether the MCO1 clock signal is used as the 25MHz clock for the Ethernet PHY. With this option disabled, the on-board 25MHz crystal oscillator located at X1 can be used instead, although in that case the board jumper JP4 must be changed. You may wish to make this change if you wish to use the MCO1 clock output for another purpose. Consult the STM32 clock and ethernet documentation for more details.

I²C Driver

The STM32 variant HAL provides the main I²C hardware driver itself, configured at CYGPKG_HAL_STM32_I2C. But the platform I²C support can also be configured separately at CYGPKG_HAL_CORTEXM_STM32_STM3210C_EVAL_I2C. This ensures that the M24C64 serial EEPROM is instantiated and becomes available for applications from <cyg/io/i2c.h>, and also ensures the STM32's I²C bus 1 is enabled for it. This option also allows the m24c64.c test is built. In order to allow writes to the serial EEPROM, you must ensure that the STM3210C-EVAL jumper JP17 is fitted. The m24c64.c test will not pass otherwise.

SPI Driver

An SPI bus driver is available for the STM32 in the package "ST STM32 SPI driver" (CYGPKG_DEVS_SPI_CORTEXM_STM32).

The only SPI device instantiated by default is for an external Aardvark SPI test board, connected to SPI bus 3 with the SD card attached to chip select 0 on PA4 and the Aardvark AT25080 to chip select 1 on PD2 (CN8 pin 24). To disable the Aardvark device support, the platform HAL contains an option "SPI devices" (CYGPKG_HAL_CORTEXM_STM32_STM3210C_EVAL_SPI) which can be disabled. No other SPI devices are instantiated.

Consult the generic SPI driver API documentation in the eCosPro Reference Manual for further details on SPI support in eCosPro, along with the configuration options in the STM32 SPI device driver.

ADC Driver

The STM32 processor variant HAL provides an ADC driver. The STM3210C-EVAL platform HAL enables the support for the devices ADC1, ADC2 and ADC3 and for configuration of the respective ADC device input channels.

Consult the generic ADC driver API documentation in the eCosPro Reference Manual for further details on ADC support in eCosPro, along with the configuration options in the STM32 ADC device driver.

2017-02-09
Documentation license for this page: eCosPro License