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71 lines
1.8 KiB
C
71 lines
1.8 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 NUM_BUFFERS (10)
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uint8_t sbuffer[NUM_BUFFERS][MAX_MESSAGE_LEN];
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uint8_t active_buffer = 0;
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uint8_t rxb[MAX_MESSAGE_LEN];
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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 (sstate == SS_IDLE && sbuffer[active_buffer][0] == 0x7E)
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{
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sstate = SS_START;
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}
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else
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{
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HAL_UART_Receive_IT(_serial_huart_inst, sbuffer[active_buffer], 1);
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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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HAL_UART_Receive(_serial_huart_inst, &sbuffer[active_buffer][1], MAX_MESSAGE_LEN, 10);
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for (int ind = 0; ind < 24; ind++)
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{
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PDEBUG("[%d]: 0x%02x\n", ind, sbuffer[active_buffer][ind]);
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}
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PDEBUG("\n\n");
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sstate = SS_IDLE;
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active_buffer = (active_buffer + 1) % NUM_BUFFERS;
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HAL_UART_Receive_IT(_serial_huart_inst, sbuffer[active_buffer], 1);
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}
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}
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void p_serial_mgr_start()
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{
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sstate = SS_IDLE;
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HAL_UART_Receive_IT(_serial_huart_inst, sbuffer[active_buffer], 1);
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}
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