#include "smartabs_comp.h"
#include "commands.h"
#include "hal.h"
#include "math.h"
#include "crc.h"
#include "defines.h"
#include "angle.h"
#include "stm32f4xx_conf.h"
#include "hw/hw.h"

HAL_COMP(smartabs);

HAL_PIN(pos);
HAL_PIN(error);
HAL_PIN(state);

#pragma pack(push, 1)
typedef struct{
  uint8_t sink : 3;
  uint8_t data_id : 4;
  uint8_t data_parity : 1;
} smartabs_cf_t;

typedef struct{
  uint8_t info : 4;
  uint8_t cnt_err : 1;
  uint8_t err : 1;
  uint8_t parity_err : 1;
  uint8_t delim_err : 1;
} smartabs_sf_t;

typedef struct{
  uint8_t req;
  smartabs_cf_t cf;
  smartabs_sf_t sf;
  uint8_t pos[3];
  uint8_t crc;
} smartabs_reply_read_0_t;
#pragma pack(pop)

const uint8_t smartabs_crc8_table[] = {
  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
  0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
  0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
  0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
  0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
  0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
  0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
  0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
  0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
  0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
  0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
  0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
  0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
  0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
  0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF,
};


struct smartabs_ctx_t {
  uint32_t error;
  union{
    smartabs_reply_read_0_t reply;
    uint8_t bytes[sizeof(smartabs_reply_read_0_t)];
  }rxbuf;
  //uint8_t rxbuf[15]
};

static void hw_init(void *ctx_ptr, hal_pin_inst_t *pin_ptr) {
  struct smartabs_ctx_t *ctx = (struct smartabs_ctx_t *)ctx_ptr;
  // struct smartabs_pin_ctx_t * pins = (struct smartabs_pin_ctx_t *)pin_ptr;
  GPIO_InitTypeDef GPIO_InitStruct;
  USART_InitTypeDef USART_InitStruct;
  DMA_InitTypeDef DMA_InitStructure;

  //TX enable
  GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_15;
  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_OUT;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStruct.GPIO_PuPd  = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOD, &GPIO_InitStruct);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6, ENABLE);

  //USART TX
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_USART6);
  GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_6;
  GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_AF;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd  = GPIO_PuPd_UP;
  GPIO_Init(GPIOC, &GPIO_InitStruct);

  //USART RX
  // GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_USART6);
  // GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11;
  // GPIO_Init(GPIOB, &GPIO_InitStruct);

  USART_InitStruct.USART_BaudRate            = 2500000;
  USART_InitStruct.USART_WordLength          = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits            = USART_StopBits_1;
  USART_InitStruct.USART_Parity              = USART_Parity_No;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStruct.USART_Mode                = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USART6, &USART_InitStruct);

  /* Enable the USART */
  USART_Cmd(USART6, ENABLE);
  USART_HalfDuplexCmd(USART6, ENABLE);

  // DMA-Disable
  DMA_Cmd(DMA2_Stream1, DISABLE);
  DMA_DeInit(DMA2_Stream1);

  // DMA2-Config
  DMA_InitStructure.DMA_Channel            = DMA_Channel_5;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (USART6->DR);
  DMA_InitStructure.DMA_Memory0BaseAddr    = (uint32_t)&ctx->rxbuf;
  DMA_InitStructure.DMA_DIR                = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize         = sizeof(ctx->rxbuf);
  DMA_InitStructure.DMA_PeripheralInc      = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc          = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize     = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_Mode               = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority           = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode           = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold      = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst        = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst    = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream1, &DMA_InitStructure);

  USART_DMACmd(USART6, USART_DMAReq_Rx, ENABLE);
}


static void rt_func(float period, void *ctx_ptr, hal_pin_inst_t *pin_ptr) {
  struct smartabs_ctx_t *ctx      = (struct smartabs_ctx_t *)ctx_ptr;
  struct smartabs_pin_ctx_t *pins = (struct smartabs_pin_ctx_t *)pin_ptr;

  //stop rx dma
  DMA_Cmd(DMA2_Stream1, DISABLE);
  DMA_ClearFlag(DMA2_Stream1, DMA_FLAG_TCIF1);

  uint8_t crc = calc_crc8(&ctx->rxbuf.reply.cf, 6, smartabs_crc8_table);

  if(!crc){
    uint32_t tpos = ((ctx->rxbuf.reply.pos[2] & 0x01) << 16) + (ctx->rxbuf.reply.pos[1] << 8) + ctx->rxbuf.reply.pos[0];
    PIN(pos) = (tpos * M_PI * 2.0 / 131072.0) - M_PI;
    PIN(state) = 3;
    PIN(error) = 0;
  }
  else{
    ctx->error++;  //TODO: overflow...
    PIN(error) = ctx->error;
    PIN(state) = 0.0;
  }

  // destroy old package
  ctx->rxbuf.reply.cf.data_id = 0;

  __disable_irq();
  GPIO_SetBits(GPIOD, GPIO_Pin_15);  //tx enable
  USART_SendData(USART6, 0x02);
  while(USART_GetFlagStatus(USART6, USART_FLAG_TC) == RESET)
    ;
  GPIO_ResetBits(GPIOD, GPIO_Pin_15);  //tx disable

  //start rx dma
  DMA_Cmd(DMA2_Stream1, ENABLE);
  __enable_irq();
}

hal_comp_t smartabs_comp_struct = {
    .name      = "smartabs",
    .nrt       = 0,
    .rt        = rt_func,
    .frt       = 0,
    .nrt_init  = 0,
    .hw_init   = hw_init,
    .rt_start  = 0,
    .frt_start = 0,
    .rt_stop   = 0,
    .frt_stop  = 0,
    .ctx_size  = sizeof(struct smartabs_ctx_t),
    .pin_count = sizeof(struct smartabs_pin_ctx_t) / sizeof(struct hal_pin_inst_t),
};