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| author | Marti Bolivar <mbolivar@leaflabs.com> | 2012-06-08 18:21:02 -0400 |
|---|---|---|
| committer | Marti Bolivar <mbolivar@leaflabs.com> | 2012-06-08 18:21:02 -0400 |
| commit | fd8456c37c7db78e93913d9f12c9b1407d3e4680 (patch) | |
| tree | 146ff3fc7fa668fb9b86dbe6f9f4eb937353994a /wirish/boards/maple/include | |
| parent | cb1facd43e34920adadf5829751d779f92cf7681 (diff) | |
| download | librambutan-fd8456c37c7db78e93913d9f12c9b1407d3e4680.tar.gz librambutan-fd8456c37c7db78e93913d9f12c9b1407d3e4680.zip | |
maple: board.h: More comments, remove SYSTICK_RELOAD_VAL.
We derive SYSTICK_RELOAD_VAL from CYCLES_PER_MICROSECOND now, so let's
hide it for expert use.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Diffstat (limited to 'wirish/boards/maple/include')
| -rw-r--r-- | wirish/boards/maple/include/board/board.h | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/wirish/boards/maple/include/board/board.h b/wirish/boards/maple/include/board/board.h index 9319989..72a4282 100644 --- a/wirish/boards/maple/include/board/board.h +++ b/wirish/boards/maple/include/board/board.h @@ -33,16 +33,19 @@ #ifndef _BOARD_MAPLE_H_ #define _BOARD_MAPLE_H_ +/* 72 MHz -> 72 cycles per microsecond. */ #define CYCLES_PER_MICROSECOND 72 -#define SYSTICK_RELOAD_VAL 71999 /* takes a cycle to reload */ +/* Pin number for the built-in button. */ #define BOARD_BUTTON_PIN 38 + +/* Pin number for the built-in LED. */ #define BOARD_LED_PIN 13 /* Number of USARTs/UARTs whose pins are broken out to headers. */ #define BOARD_NR_USARTS 3 -/* Default USART pin numbers (not considering AFIO remap) */ +/* USART pin numbers. */ #define BOARD_USART1_TX_PIN 7 #define BOARD_USART1_RX_PIN 8 #define BOARD_USART2_TX_PIN 1 @@ -50,10 +53,10 @@ #define BOARD_USART3_TX_PIN 29 #define BOARD_USART3_RX_PIN 30 -/* Number of SPI ports */ +/* Number of SPI ports broken out to headers. */ #define BOARD_NR_SPI 2 -/* Default SPI pin numbers (not considering AFIO remap) */ +/* SPI pin numbers. */ #define BOARD_SPI1_NSS_PIN 10 #define BOARD_SPI1_MOSI_PIN 11 #define BOARD_SPI1_MISO_PIN 12 @@ -64,20 +67,22 @@ #define BOARD_SPI2_SCK_PIN 32 /* Total number of GPIO pins that are broken out to headers and - * intended for general use. */ + * intended for use. This includes pins like the LED, button, and + * debug port (JTAG/SWD) pins. */ #define BOARD_NR_GPIO_PINS 44 -/* Number of pins capable of PWM output */ +/* Number of pins capable of PWM output. */ #define BOARD_NR_PWM_PINS 15 -/* Number of pins capable of ADC conversion */ +/* Number of pins capable of ADC conversion. */ #define BOARD_NR_ADC_PINS 15 /* Number of pins already connected to external hardware. For Maple, - * these are just BOARD_LED_PIN and BOARD_BUTTON_PIN. */ + * these are just BOARD_LED_PIN, BOARD_BUTTON_PIN, and the debug port + * pins (see below). */ #define BOARD_NR_USED_PINS 7 -/* Debug port pins */ +/* Debug port pins. */ #define BOARD_JTMS_SWDIO_PIN 39 #define BOARD_JTCK_SWCLK_PIN 40 #define BOARD_JTDI_PIN 41 |