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