diff options
Diffstat (limited to 'nuttx/configs/mirtoo/README.txt')
| -rw-r--r-- | nuttx/configs/mirtoo/README.txt | 111 |
1 files changed, 101 insertions, 10 deletions
diff --git a/nuttx/configs/mirtoo/README.txt b/nuttx/configs/mirtoo/README.txt index 7934ea7e4..24f6314ef 100644 --- a/nuttx/configs/mirtoo/README.txt +++ b/nuttx/configs/mirtoo/README.txt @@ -13,6 +13,7 @@ Contents Loading NuttX with ICD3 LED Usage UART Usage + Analog Input PIC32MX Configuration Options Configurations @@ -385,9 +386,9 @@ Toolchains information about using the Pinguino mips-elf toolchain in this thread: http://tech.groups.yahoo.com/group/nuttx/message/1821 - Experimental (and untested) support for the Pinguino mips-elf toolchain has - been included in the Mirtoo configurations. Use this configuration option to - select the Pinguino mips-elf toolchain: + Support for the Pinguino mips-elf toolchain has been included in the Mirtoo + configurations. Use one of these configuration options to select the Pinguino + mips-elf toolchain: CONFIG_PIC32MX_PINGUINOW - Pinguino mips-elf toolchain for Windows CONFIG_PIC32MX_PINGUINOL - Pinguino mips toolchain for Linux @@ -509,10 +510,10 @@ LED Usage --- ----- -------------------------------------------------------------- RC8 LED0 Grounded, high value illuminates RC9 LED1 Grounded, high value illuminates - + The Dimitech DTX1-4000L EV-kit1 supports 3 more LEDs, but there are not controllable from software. - + If CONFIG_ARCH_LEDS is defined, then NuttX will control these LEDs as follows: ON OFF @@ -560,6 +561,91 @@ UART Usage change will give you a little more memory by re-using the boot FLASH and SRAM that would otherwise be reserved for MPLAB. +Analog Input +============ + + The Mirtoo features a PGA117 amplifier/multipexer that can be configured to + bring any analog signal from PORT0,.. PORT7 to pin 19 of the PIC32MX: + + --- ------------------------------------------------ ---------------------------- + PIN PIC32 SIGNAL(s) BOARD SIGNAL/USAGE + --- ------------------------------------------------ ---------------------------- + 19 PGED3/VREF+/CVREF+/AN0/C3INC/RPA0/CTED1/PMD7/RA0 AIN PGA117 Vout + --- ------------------------------------------------ ---------------------------- + + The PGA117 driver can be enabled by setting the following the the nsh + configuration: + + CONFIG_ADC=y : Enable support for analog input devices + CONFIG_PIC32MX_ADC=y : Enable support the PIC32 ADC driver + CONFIG_SPI_OWNBUS=n : The PGA117 is *not* the only device on the bus + CONFIG_ADC_PGA11X=y : Enable support for the PGA117 + + When CONFIG_PIC32MX_ADC=y is defined, the Mirtoo boot up logic will + automatically configure pin 18 (AN0) as an analog input (see configs/mirtoo/src/up_adc.c). + To intialize and use the PGA117, you to add logic something like the + following in your application code: + + #include <nuttx/spi.h> + #include <nuttx/analog/pga11x.h> + + FAR struct spi_dev_s *spi; + PGA11X_HANDLE handle; + + /* Get the SPI port */ + + spi = up_spiinitialize(2); + if (!spi) + { + dbg("ERROR: Failed to initialize SPI port 2\n"); + return -ENODEV; + } + + /* Now bind the SPI interface to the PGA117 driver */ + + handle = pga11x_initialize(spi); + if (!handle) + { + dbg("ERROR: Failed to bind SPI port 2 to the PGA117 driver\n"); + return -ENODEV; + } + + After that initialization is set, then one of PORT0-7 can be select as + an analog input to AN0 like: + + struct pga11x_settings_s settings; + int ret; + + settings.channel = PGA11X_CHAN_CH2; + settings.gain = PGA11X_GAIN_2; + + ret = pga11x_select(handle, &settings); + if (ret < 0) + { + dbg("ERROR: Failed to select channel 2, gain 2\n"); + return -EIO; + } + + The above logic may belong in configs/mirtoo/src/up_adc.c? + + There is still one missing piece to complete the analog support on the + Mirtoo. This is the ADC driver that collects analog data and provides + and ADC driver that can be used with standard open, close, read, and write + interfaces. To complete this driver, the following is needed: + + (1) arch/mips/src/pic32mx/pic32mx-adc.c. The ADC driver that implements + the ADC interfaces defined in include/nuttx/analog/adc.h and must + be built when CONFIG_PIC32MX_ADC is defined. + + (2) configs/mirtoo/up_adc.c. Add Mirtoo logic that initializes and + registers the ADC driver. + + A complete ADC driver will be a considerable amount of work to support + all of the ADC features (such as timer driven sampling). If all you want + to do is a simple analog conversion, then in lieu of a real ADC driver, + you can use simple in-line logic such as you can see in the PIC32MX7 MMB + touchscreen driver at configs/pic32mx7mmb/src/up_touchscreen.c + PIC32MX Configuration Options ============================= @@ -791,7 +877,7 @@ Where <subdir> is one of the following: This configuration also uses the Microchip C32 toolchain under windows by default: - + CONFIG_PIC32MX_MICROCHIPW_LITE=y : Lite version of windows toolchain To switch to the Linux C32 toolchain you will have to change (1) the @@ -815,7 +901,7 @@ Where <subdir> is one of the following: This configuration also uses the Microchip C32 toolchain under windows by default: - + CONFIG_PIC32MX_MICROCHIPW_LITE=y : Lite version of windows toolchain To switch to the Linux C32 toolchain you will have to change (1) the @@ -840,7 +926,12 @@ Where <subdir> is one of the following: for the nsh configuration). This configuration differs from the nsh configuration in the following ways: - 1) SPI2 is enabled and support is included for the NXFFS file system + 1) It uses the Pinguino toolchain be default (this is easily changed, + see above). + + CONFIG_PIC32MX_PINGUINOW=y + + 2) SPI2 is enabled and support is included for the NXFFS file system on the 32Mbit SST25 device on the Mirtoo board. NXFFS is the NuttX wear-leveling file system. @@ -851,7 +942,7 @@ Where <subdir> is one of the following: CONFIG_FS_NXFFS=y CONFIG_NSH_ARCHINIT=y - 2) Many operating system features are suppressed to produce a smaller + 3) Many operating system features are suppressed to produce a smaller footprint. CONFIG_SCHED_WAITPID=n @@ -860,7 +951,7 @@ Where <subdir> is one of the following: CONFIG_DISABLE_MQUEUE=y CONFIG_DISABLE_MQUEUE=y - 3) Many NSH commands are suppressed, also for a smaller FLASH footprint + 4) Many NSH commands are suppressed, also for a smaller FLASH footprint CONFIG_NSH_DISABLESCRIPT=y CONFIG_NSH_DISABLEBG=y |