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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
#include "p_serial_mgr.h"
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#include "putil.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 (of non-delimited framebuffer)
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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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} serial_state_t;
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static UART_HandleTypeDef *_serial_huart_inst = NULL;
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static uint8_t rxc = '\0';
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static serial_state_t sstate = SS_IDLE;
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void UART1_RxCpltCallback(UART_HandleTypeDef *huart)
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{
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if (rxc == 0x7E && sstate == SS_IDLE)
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{
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sstate = SS_START;
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}
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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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}
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void p_serial_mgr_service(void)
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{
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if (sstate == SS_START)
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{
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return;
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}
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else if (sstate = SS_IDLE) {}
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return b_go;
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}
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void p_serial_mgr_start()
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{
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b_go = false;
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HAL_UART_Receive_IT(_serial_huart_inst, &rxc, 1);
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}
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