Initial commit

Src/control.c

@@ -0,0 +1,121 @@
+
+#include <stdbool.h>
+#include <string.h>
+#include "stm32f1xx_hal.h"
+#include "defines.h"
+#include "setup.h"
+#include "config.h"
+
+TIM_HandleTypeDef TimHandle;
+uint8_t ppm_count = 0;
+uint32_t timeout = 100;
+uint8_t nunchuck_data[6] = {0};
+
+uint8_t i2cBuffer[2];
+
+extern I2C_HandleTypeDef hi2c2;
+extern DMA_HandleTypeDef hdma_i2c2_rx;
+extern DMA_HandleTypeDef hdma_i2c2_tx;
+
+#ifdef CONTROL_PPM
+uint16_t ppm_captured_value[PPM_NUM_CHANNELS + 1] = {500, 500};
+uint16_t ppm_captured_value_buffer[PPM_NUM_CHANNELS+1] = {500, 500};
+uint32_t ppm_timeout = 0;
+
+bool ppm_valid = true;
+
+#define IN_RANGE(x, low, up) (((x) >= (low)) && ((x) <= (up)))
+
+void PPM_ISR_Callback(void) {
+  // Dummy loop with 16 bit count wrap around
+  uint16_t rc_delay = TIM2->CNT;
+  TIM2->CNT = 0;
+
+  if (rc_delay > 3000) {
+    if (ppm_valid && ppm_count == PPM_NUM_CHANNELS) {
+      ppm_timeout = 0;
+      memcpy(ppm_captured_value, ppm_captured_value_buffer, sizeof(ppm_captured_value));
+    }
+    ppm_valid = true;
+    ppm_count = 0;
+  }
+  else if (ppm_count < PPM_NUM_CHANNELS && IN_RANGE(rc_delay, 900, 2100)){
+    timeout = 0;
+    ppm_captured_value_buffer[ppm_count++] = CLAMP(rc_delay, 1000, 2000) - 1000;
+  } else {
+    ppm_valid = false;
+  }
+}
+
+// SysTick executes once each ms
+void PPM_SysTick_Callback(void) {
+  ppm_timeout++;
+  // Stop after 500 ms without PPM signal
+  if(ppm_timeout > 500) {
+    int i;
+    for(i = 0; i < PPM_NUM_CHANNELS; i++) {
+      ppm_captured_value[i] = 500;
+    }
+    ppm_timeout = 0;
+  }
+}
+
+void PPM_Init(void) {
+  GPIO_InitTypeDef GPIO_InitStruct;
+  /*Configure GPIO pin : PA3 */
+  GPIO_InitStruct.Pin = GPIO_PIN_3;
+  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+  __HAL_RCC_TIM2_CLK_ENABLE();
+  TimHandle.Instance = TIM2;
+  TimHandle.Init.Period = UINT16_MAX;
+  TimHandle.Init.Prescaler = (SystemCoreClock/DELAY_TIM_FREQUENCY_US)-1;;
+  TimHandle.Init.ClockDivision = 0;
+  TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
+  HAL_TIM_Base_Init(&TimHandle);
+
+  /* EXTI interrupt init*/
+  HAL_NVIC_SetPriority(EXTI3_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(EXTI3_IRQn);
+  HAL_TIM_Base_Start(&TimHandle);
+}
+#endif
+
+void Nunchuck_Init(void) {
+    //-- START -- init WiiNunchuck
+  i2cBuffer[0] = 0xF0;
+  i2cBuffer[1] = 0x55;
+
+  HAL_I2C_Master_Transmit(&hi2c2,0xA4,(uint8_t*)i2cBuffer, 2, 100);
+  HAL_Delay(10);
+
+  i2cBuffer[0] = 0xFB;
+  i2cBuffer[1] = 0x00;
+
+  HAL_I2C_Master_Transmit(&hi2c2,0xA4,(uint8_t*)i2cBuffer, 2, 100);
+  HAL_Delay(10);
+}
+
+void Nunchuck_Read(void) {
+  i2cBuffer[0] = 0x00;
+  HAL_I2C_Master_Transmit(&hi2c2,0xA4,(uint8_t*)i2cBuffer, 1, 100);
+  HAL_Delay(5);
+  if (HAL_I2C_Master_Receive(&hi2c2,0xA4,(uint8_t*)nunchuck_data, 6, 100) == HAL_OK) {
+    timeout = 0;
+  } else {
+    timeout++;
+  }
+
+  if (timeout > 3) {
+    HAL_Delay(50);
+    Nunchuck_Init();
+  }
+
+  //setScopeChannel(0, (int)nunchuck_data[0]);
+  //setScopeChannel(1, (int)nunchuck_data[1]);
+  //setScopeChannel(2, (int)nunchuck_data[5] & 1);
+  //setScopeChannel(3, ((int)nunchuck_data[5] >> 1) & 1);
+}