diff options
| -rw-r--r-- | source/hardware/maple-ret6.rst | 28 | ||||
| -rw-r--r-- | source/hardware/maple.rst | 32 |
2 files changed, 48 insertions, 12 deletions
diff --git a/source/hardware/maple-ret6.rst b/source/hardware/maple-ret6.rst index 45a59cd..5fa43a8 100644 --- a/source/hardware/maple-ret6.rst +++ b/source/hardware/maple-ret6.rst @@ -13,22 +13,27 @@ Technical Specifications * MCU: **STM32F103RET6**, a 32-bit ARM Cortex M3 microprocessor * Clock Speed: **72 MHz** - * Operating Voltage: 3.3V - * Input Voltage (recommended): 3V-12V + * **512KB Flash** and **64KB SRAM** * 44 Digital I/O Pins (:ref:`GPIO <gpio>`) * 16 Analog Input pins, 12 bit **ADC** resolution (:ref:`ADC <adc>`) + * Built-in, 2 channel **DAC** at 12 bit resolution + (:ref:`libmaple-dac`). * 19 **PWM** pins at 16-bit resolution (:ref:`PWM <pwm>`) * Dedicated **USB** port for programming and communications (:ref:`USB<usb>`) * External **JTAG** interface (:ref:`JTAG <jtag>`) - * **512KB Flash** and **64KB SRAM** - * 64 Channel nested vector interrupt handler (including external interrupt on GPIOs) + * 64 Channel nested vector interrupt handler (including + :ref:`external interrupt <lang-attachinterrupt>` on GPIOs) * Integrated **SPI** (:ref:`SPI <spi>`) + * Integrated **SDIO** * Integrated **I2C** and **I2S** (:ref:`I2C <i2c>`) - * 12 Channels of Direct Memory Access (**DMA**) + * 12 Channels of Direct Memory Access (**DMA**) (:ref:`libmaple-dma`) * 3 **USART** and 2 **UART** devices (:ref:`USART <usart>`) - * Six 4-channel and two basic **timers** (:ref:`Timers <timers>`) + * Two advanced control, four general purpose, two basic **timers** + (:ref:`timers`) * Supplies up to 800mA @ 3.3v * Support for low power and sleep modes (<500uA) + * Operating Voltage: 3.3V + * Input Voltage (recommended): 3V-12V * Dimensions are 2.05″x2.1″ .. _maple-ret6-powering: @@ -256,12 +261,21 @@ Errata This section lists known issues and warnings for the Maple RET6 Edition. -* **DAC, UART4, UART5 GPIOs unavailable**: Pins related to the digital +* **UART4, UART5 GPIOs unavailable**: Pins related to the digital to analog converter (DAC) and UARTs 4 and 5 are not broken out to headers. The RET6 Edition's hardware layout is identical to that of the Maple Rev 5, which wasn't designed for use with these STM32F103RET6-only peripherals. +* **DAC channel 2 on BOARD_LED_PIN**: The Maple Rev 5 connects PA5 to + the board's built-in LED; this is the same GPIO bit which is + connected to the DAC's channel 2 output. + +* **Reset and NJTRST tied together**: The MCU's reset pin is tied to + PB4, the NJTRST (JTAG reset) pin, which is pin 43. Thus, attempting + to use pin 43 as a GPIO will reset your board (and also prevents the + JTAG "reset halt" command from working properly). + Recommended Reading ------------------- diff --git a/source/hardware/maple.rst b/source/hardware/maple.rst index 87878e9..4616ac7 100644 --- a/source/hardware/maple.rst +++ b/source/hardware/maple.rst @@ -13,22 +13,23 @@ Technical Specifications * MCU: **STM32F103RBT6**, a 32-bit ARM Cortex M3 microprocessor * Clock Speed: **72 MHz** - * Operating Voltage: 3.3V - * Input Voltage (recommended): 3V-12V + * **128KB Flash** and **20KB SRAM** * 44 Digital I/O Pins (:ref:`GPIO <gpio>`) * 16 Analog Input Pins, 12-bit **ADC** resolution (:ref:`ADC <adc>`) * 15 **PWM** pins at 16-bit resolution (:ref:`PWM <pwm>`) * Dedicated **USB** port for programming and communications (:ref:`USB <usb>`) * External **JTAG** interface (:ref:`JTAG <jtag>`) - * **128KB Flash** and **20KB SRAM** - * 64 Channel nested vector interrupt handler (including external interrupt on GPIOs) + * 64 Channel nested vector interrupt handler (including + :ref:`external interrupt <lang-attachinterrupt>` on GPIOs) * Integrated **SPI** (:ref:`SPI <spi>`) * Integrated **I2C** (:ref:`I2C <i2c>`) - * 7 Channels of Direct Memory Access (**DMA**) + * 7 Channels of Direct Memory Access (**DMA**) (:ref:`libmaple.dma`) * 3 **USART** divices (:ref:`USART <usart>`) * Four 4-channel **timers** (:ref:`Timers <timers>`) * Supplies up to 800mA @ 3.3v * Support for low power and sleep modes (<500uA) + * Operating Voltage: 3.3V + * Input Voltage (recommended): 3V-12V * Dimensions are 2.05″x2.1″ .. _maple-identify-rev: @@ -307,6 +308,13 @@ Rev 5 from its silkscreen. This mistake was fixed in later manufacturing runs. +* **Reset and NJTRST tied together**: The MCU's reset pin is tied to + PB4, the NJTRST pin, which is pin 43. Thus, attempting to use pin + 43 as a GPIO will reset your board (and also prevents the JTAG + "reset halt") command from working properly. It's possible to cut + the trace, but doing so will damage your board, so we *do not + recommend it* unless you're very sure about what you're doing. + Rev 3 ^^^^^ @@ -352,6 +360,13 @@ Rev 3 * **PWM Marketing Mistake**: We originally sold the Maple advertising 22 channels of 16-bit hardware PWM; actually the Maple only has 15. +* **Reset and NJTRST tied together**: The MCU's reset pin is tied to + PB4, the NJTRST pin, which is pin 43. Thus, attempting to use pin + 43 as a GPIO will reset your board (and also prevents the JTAG + "reset halt") command from working properly. It's possible to cut + the trace, but doing so will damage your board, so we *do not + recommend it* unless you're very sure about what you're doing. + Rev 1 ^^^^^ @@ -386,6 +401,13 @@ Rev 1 * **PWM Marketing Mistake**: We originally sold the Maple advertising 22 channels of 16-bit hardware PWM; the correct number is 15. +* **Reset and NJTRST tied together**: The MCU's reset pin is tied to + PB4, the NJTRST pin, which is pin 43. Thus, attempting to use pin + 43 as a GPIO will reset your board (and also prevents the JTAG + "reset halt") command from working properly. It's possible to cut + the trace, but doing so will damage your board, so we *do not + recommend it* unless you're very sure about what you're doing. + Recommended Reading ------------------- |