Diff: Encoder/EncoderMspInitF1.cpp

Revision:

0:f12d257b587e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Encoder/EncoderMspInitF1.cpp	Thu Sep 01 05:13:31 2016 +0000
@@ -0,0 +1,74 @@
+#include "mbed.h"
+/*
+ * HAL_TIM_Encoder_MspInit()
+ * Overrides the __weak function stub in stm32f1xx_hal_tim.h
+ *
+ * Edit the below for your preferred pin wiring & pullup/down
+ * I have encoder common at 3V3, using GPIO_PULLDOWN on inputs.
+ * Encoder A&B outputs connected directly to GPIOs.
+ *
+ * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00161566.pdf
+ * Table 5 has GPIO alternate function pinout mappings.
+ *
+ * TIM1_CH1: default PA_8, remap PE_9
+ * TIM1_CH2: default PA_9, remap PE_11
+ *
+ * TIM2_CH1: default PA_0 
+ * TIM2_CH2: default PA_1, remap PB_3
+ *
+ * TIM3_CH1: default PA_6, remap PB_4, PC_6
+ * TIM3_CH2: default PA_7, remap PB_5, PC_7
+ *
+ * TIM4_CH1: default PB_6, remap PD_12
+ * TIM4_CH2: default PB_7, remap PD_13
+ *
+ * NB one of these timers will be the employed by mbed as systick, unavailable as encoder.
+ */
+
+#ifdef TARGET_STM32F1
+void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef *htim)
+{
+    GPIO_InitTypeDef GPIO_InitStruct;
+
+    if (htim->Instance == TIM1) { //PA8 PA9 = Nucleo D7 D8
+        __TIM1_CLK_ENABLE();
+        __GPIOA_CLK_ENABLE();
+        GPIO_InitStruct.Pin = GPIO_PIN_8 | GPIO_PIN_9;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_PULLDOWN;
+        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+//        GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    }
+    else if (htim->Instance == TIM2) { //PA0 PA1 = Nucleo A0 A1
+        __TIM2_CLK_ENABLE();
+        __GPIOA_CLK_ENABLE();
+        GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_PULLDOWN;
+        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+//        GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    }
+    else if (htim->Instance == TIM3) { //PA6 PA7 = Nucleo D12 D11
+        __TIM3_CLK_ENABLE();
+        __GPIOA_CLK_ENABLE();
+        GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_PULLDOWN;
+        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+//        GPIO_InitStruct.Alternate = GPIO_AF2_TIM3;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    }
+    else if (htim->Instance == TIM4) { // PB6 PB7 = Nucleo D10 MORPHO PB7
+        __TIM4_CLK_ENABLE();
+        __GPIOB_CLK_ENABLE();
+        GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_PULLDOWN;
+        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+//        GPIO_InitStruct.Alternate = GPIO_AF2_TIM4;
+        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+    }
+}
+#endif
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