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113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
#include "p_serial_mgr.h"
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#include "PCircularBuffer.h"
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#include "stm32l4xx_hal_uart.h"
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#define MAX_SERIAL_BUFFER_SIZE (262) // Actually 261, add 1 for padding
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// this protocol is very similar to the digi api v2 (inspired from)
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// [0]{1} Start delimiter 0x7E
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// [1]{1} Source Address
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// [2]{1} Destination Address
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// [3]{1} Length Byte
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// [4-n]{n} frame data
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// [n+1]{1} checksum
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// Escape bytes are 0x7D, only frame data can be escaped
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// Escaped bytes are followed by the byte to be escaped XOR'd with 0x20
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// 0x7D and 0x7E need to be escaped (within the frame data)
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typedef enum serial_state_t
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{
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SS_IDLE = 0, // waiting
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SS_START = 1, // get start byte, interrupt after 4 more bytes
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SS_FRAME = 2, // get byte
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SS_ESC = 3, // get byte, dont increment number left
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SS_CHECKSUM = 4 // done
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} serial_state_t;
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static UART_HandleTypeDef *_serial_huart_inst = NULL;
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static serial_state_t sstate = SS_IDLE;
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static uint8_t rxc = '\0';
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static serial_pkt_t pkt_bank[10];
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static p_cb_serial_pkt_t serial_pkt_cb;
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static volatile uint8_t index_tracker = 0;
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void UART1_RxCpltCallback(UART_HandleTypeDef *huart)
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{
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switch (sstate)
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{
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case SS_IDLE: // packet start
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{
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if (rxc == 0x7E)
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{
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sstate = SS_START;
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}
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}
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break;
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case SS_START:
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{
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switch (index_tracker)
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{
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case 0: // source addr
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{
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serial_pkt_cb.buffer[serial_pkt_cb.head].src_addr = rxc;
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}
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break;
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case 1:
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{
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serial_pkt_cb.buffer[serial_pkt_cb.head].dest_addr = rxc;
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}
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break;
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case 2:
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{
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serial_pkt_cb.buffer[serial_pkt_cb.head].len = rxc;
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}
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break;
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default:
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{
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// shouldnt get here
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for (;;)
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{}
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}
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};
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}
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break;
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case SS_ESC:
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{
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}
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break;
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case SS_CHECKSUM:
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{
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}
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break;
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default:
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{
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PDEBUG("Shouldn't have hit this!\n");
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}
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};
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HAL_UART_Receive_IT(_serial_huart_inst, &rxc, 1);
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// serial_cb.push(&serial_cb, serial_cb_rxc);
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// HAL_GPIO_WritePin(USART1_DE_GPIO_Port, USART1_DE_Pin, 1);
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// huart2_rxc = huart1_rxc;
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// HAL_UART_Transmit(&huart2, &huart2_rxc, 1, 500);
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// HAL_UART_Receive_IT(&huart1, &huart1_rxc, 1);
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// HAL_GPIO_WritePin(USART1_DE_GPIO_Port, USART1_DE_Pin, 0);
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}
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void p_serial_mgr_init(UART_HandleTypeDef *huart)
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{
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_serial_huart_inst = huart;
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_serial_huart_inst->RxCpltCallback = UART1_RxCpltCallback;
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p_cb_serial_pkt_init(&serial_pkt_cb, pkt_bank, 10);
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}
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void p_serial_mgr_service(void)
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{}
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void p_serial_mgr_start()
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{
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HAL_UART_Receive_IT(_serial_huart_inst, &rxc, 1);
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}
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