kopia lustrzana https://github.com/pimoroni/pimoroni-pico
67 wiersze
2.5 KiB
C++
67 wiersze
2.5 KiB
C++
#pragma once
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#include <stdint.h>
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#include "hardware/pio.h"
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namespace pimoroni {
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class APS6404 {
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public:
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static constexpr int RAM_SIZE = 8 * 1024 * 1024;
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static constexpr int PAGE_SIZE = 1024;
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APS6404(uint pin_csn = 17, uint pin_d0 = 19, PIO pio = pio0);
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void init();
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void set_qpi();
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void set_spi();
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// Must be called if the system clock rate is changed after init().
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void adjust_clock();
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// Start a write, this completes asynchronously, this function blocks if another
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// transfer is already in progress
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// Writes should always be <= 1KB.
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void write(uint32_t addr, uint32_t* data, uint32_t len_in_bytes);
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void write_repeat(uint32_t addr, uint32_t data, uint32_t len_in_bytes);
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// Start a read, this completes asynchronously, this function only blocks if another
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// transfer is already in progress
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void read(uint32_t addr, uint32_t* read_buf, uint32_t len_in_words);
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// Start multiple reads to the same buffer. They completes asynchronously,
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// this function only blocks if another transfer is already in progress
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void multi_read(uint32_t* addresses, uint32_t* lengths, uint32_t num_addresses, uint32_t* read_buf, int chain_channel = -1);
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// Read and block until completion
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void read_blocking(uint32_t addr, uint32_t* read_buf, uint32_t len_in_words) {
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read(addr, read_buf, len_in_words);
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wait_for_finish_blocking();
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}
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// Block until any outstanding read or write completes
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void wait_for_finish_blocking();
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private:
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void start_read(uint32_t* read_buf, uint32_t total_len_in_words, int chain_channel = -1);
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void setup_cmd_buffer_dma(bool clear = false);
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uint32_t* add_read_to_cmd_buffer(uint32_t* cmd_buf, uint32_t addr, uint32_t len_in_words);
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uint pin_csn; // CSn, SCK must be next pin after CSn
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uint pin_d0; // D0, D1, D2, D3 must be consecutive
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PIO pio;
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uint16_t pio_sm;
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uint16_t pio_offset;
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const pio_program* pio_prog;
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uint dma_channel;
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uint read_cmd_dma_channel;
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bool last_cmd_was_write = false;
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static constexpr int MULTI_READ_MAX_PAGES = 128;
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uint32_t multi_read_cmd_buffer[3 * MULTI_READ_MAX_PAGES];
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uint32_t repeat_data;
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};
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}
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