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authorbnewbold <bnewbold@robocracy.org>2015-03-03 00:14:07 -0800
committerbnewbold <bnewbold@robocracy.org>2015-03-03 00:15:30 -0800
commitddcb9f7788e42eaa5fd60d1a479ec490f80778d8 (patch)
tree2dcf7e01ddfec0f5b430a12ede27ee12049c4c37 /wirish/boards/st_stm32f401cdiscovery
parent3246f26bfa100e3d2e1d9a0c761774b9c6fed35a (diff)
downloadlibrambutan-ddcb9f7788e42eaa5fd60d1a479ec490f80778d8.tar.gz
librambutan-ddcb9f7788e42eaa5fd60d1a479ec490f80778d8.zip
st_stm32f401cdiscovery: better wirish board support
Diffstat (limited to 'wirish/boards/st_stm32f401cdiscovery')
-rw-r--r--wirish/boards/st_stm32f401cdiscovery/include/board/board.h32
1 files changed, 27 insertions, 5 deletions
diff --git a/wirish/boards/st_stm32f401cdiscovery/include/board/board.h b/wirish/boards/st_stm32f401cdiscovery/include/board/board.h
index 3d4b44c..a30bd3c 100644
--- a/wirish/boards/st_stm32f401cdiscovery/include/board/board.h
+++ b/wirish/boards/st_stm32f401cdiscovery/include/board/board.h
@@ -36,11 +36,29 @@
/* 84 MHz -> 84 cycles per microsecond. */
#define CYCLES_PER_MICROSECOND 84
-/* Pin number for the built-in button. */
-#define BOARD_BUTTON_PIN 0
-
-/* Pin number for the built-in LED. */
-#define BOARD_LED_PIN 63
+// PLL config for 8 MHz external crystal
+// --> 84 MHz SYSCLK, with 48 MHz PLL48CK.
+//
+// Additional constraints:
+// ASSERT_FAULT((data->pllq >= 4) && (data->pllq <= 15));
+// ASSERT_FAULT((data->pllp >= 2) && (data->pllp <= 8));
+// ASSERT_FAULT(!(data->pllp & 1));
+// ASSERT_FAULT((data->plln >= 192) && (data->plln <= 432));
+// ASSERT_FAULT((data->pllm >= 2) && (data->pllm <= 63));
+//
+// f_VCO = (INPUT) X (PLL_N / PLL_M)
+#define BOARD_PLL_N 336
+#define BOARD_PLL_M 8
+// SYSCLK = f_PLL = f_VCO / PLL_P; PLL_P = {2, 4, 6, 8}
+#define BOARD_PLL_P 4
+// PLL48CK = f_USBETC = f_VCO / PLL_Q; 2 <= PLL_Q <= 15
+#define BOARD_PLL_Q 7 // should be 2?
+
+/* Pin number for the built-in button (USER button on STM32F401DISCOVERY) */
+#define BOARD_BUTTON_PIN PA0
+
+/* Pin number for the built-in LED (blue LED on STM32F401DISCOVERY) */
+#define BOARD_LED_PIN PD15
/* Number of USARTs/UARTs whose pins are broken out to headers. */
#define BOARD_NR_USARTS 3
@@ -50,6 +68,10 @@
#define BOARD_USART1_RX_PIN 10
#define BOARD_USART2_TX_PIN 2
#define BOARD_USART2_RX_PIN 3
+/* FIXME:
+#define BOARD_USART3_TX_PIN -1
+#define BOARD_USART3_RX_PIN -1
+*/
/* Number of SPI ports broken out to headers. */
#define BOARD_NR_SPI 2