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authorMarti Bolivar <mbolivar@leaflabs.com>2012-06-08 18:21:02 -0400
committerMarti Bolivar <mbolivar@leaflabs.com>2012-06-08 18:21:02 -0400
commitfd8456c37c7db78e93913d9f12c9b1407d3e4680 (patch)
tree146ff3fc7fa668fb9b86dbe6f9f4eb937353994a /wirish/boards/maple
parentcb1facd43e34920adadf5829751d779f92cf7681 (diff)
downloadlibrambutan-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')
-rw-r--r--wirish/boards/maple/include/board/board.h23
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