80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
#ifndef __SERIAL_H__
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#define __SERIAL_H__
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#include <global.h>
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#include <cobs.h>
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struct dma_tx_buf {
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/* The following fields are accessed only from DMA ISR */
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ssize_t xfr_start; /* Start index of running DMA transfer */
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ssize_t xfr_end; /* End index of running DMA transfer plus one */
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bool wraparound;
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ssize_t xfr_next;
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bool ack;
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/* The following fields are written only from non-interrupt code */
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ssize_t wr_pos; /* Next index to be written */
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ssize_t wr_idx;
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ssize_t packet_end[8];
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/* The following may be accessed by anything */
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uint8_t data[512];
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};
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struct uart_dma_state {
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struct dma_tx_buf tx_buf;
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uint32_t tx_overruns, rx_overruns;
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uint32_t rx_framing_errors, rx_protocol_errors;
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uint32_t retransmissions, packet_count;
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ErrorCode error;
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struct cobs_decode_state cobs_state;
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size_t tx_dma_ch;
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USART_TypeDef *usart;
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uint8_t rx_buf[32];
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uint8_t addr;
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};
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struct __attribute__((__packed__)) ll_pkt {
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uint32_t crc32;
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/* CRC computed over entire packet starting here */
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uint8_t src;
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uint8_t dst;
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uint8_t pid;
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uint8_t type;
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uint8_t data[0];
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};
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enum ctrl_pkt_type {
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CTRL_PKT_RESET = 1,
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CTRL_PKT_ACK = 2,
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CTRL_PKT_NACK = 3,
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CTRL_PKT_PING = 4,
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CTRL_PKT_PONG = 5,
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_USER_PKT_START = 16,
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};
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enum user_pkt_type {
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USER_PKT_ADC_DATA = _USER_PKT_START+0,
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USER_PKT_SET_DISPLAY = _USER_PKT_START+1,
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};
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struct __attribute__((__packed__)) user_pkt_adc_data {
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struct ll_pkt hdr;
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uint8_t adc_data_packed[3*2*16];
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};
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extern volatile struct uart_dma_state uart_st;
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void uart_dma_init(USART_TypeDef *usart, int tx_dma_ch, int addr);
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int uart_send_packet_nonblocking(struct ll_pkt *pkt, size_t pkt_len);
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int uart_ack_packet(uint8_t idx);
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void uart_dma_interrupt(uint32_t channel, uint32_t flags);
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void uart_interrupt(uint32_t isr);
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extern void uart_handle_user_packet(struct ll_pkt *pkt, size_t len);
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#endif // __SERIAL_H__
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