pimoroni-pico/drivers/esp32spi/spi_drv.hpp

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#pragma once
#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/spi.h"
// Maximum size of a SSID
#define WL_SSID_MAX_LENGTH 32
// Length of passphrase. Valid lengths are 8-63.
#define WL_WPA_KEY_MAX_LENGTH 63
// Length of key in bytes. Valid values are 5 and 13.
#define WL_WEP_KEY_MAX_LENGTH 13
// Size of a MAC-address or BSSID
#define WL_MAC_ADDR_LENGTH 6
// Size of a MAC-address or BSSID
#define WL_IPV4_LENGTH 4
// Maximum size of a SSID list
#define WL_NETWORKS_LIST_MAXNUM 10
#define IF_CHECK_START_CMD() \
if(!wait_for_byte(START_CMD)) { \
printf("Error waiting START_CMD\n"); \
return false; \
} \
else \
#define CHECK_DATA(check, x) \
if(!read_and_check_byte(check, &x)) { \
printf("Reply error\n"); \
return false; \
} \
else \
namespace pimoroni {
class SpiDrv {
//--------------------------------------------------
// Constants
//--------------------------------------------------
public:
static const uint8_t DEFAULT_CS_PIN = 7;
static const uint8_t DEFAULT_SCK_PIN = 18;
static const uint8_t DEFAULT_MOSI_PIN = 19;
static const uint8_t DEFAULT_MISO_PIN = 16;
static const uint8_t DEFAULT_RESETN_PIN = 11;
static const uint8_t DEFAULT_GPIO0_PIN = 2;
static const uint8_t DEFAULT_ACK_PIN = 10;
static const uint8_t DUMMY_DATA = 0xFF;
private:
static const uint8_t START_CMD = 0xE0;
static const uint8_t END_CMD = 0xEE;
static const uint8_t ERR_CMD = 0xEF;
static const uint8_t CMD_FLAG = 0;
static const uint8_t REPLY_FLAG = 1 << 7;
static const uint8_t DATA_FLAG = 0x40;
static const uint8_t CMD_POS = 1; // Position of Command OpCode on SPI stream
static const uint8_t PARAM_LEN_POS = 2; // Position of Param len on SPI stream
static const int BYTE_TIMEOUT = 1000;
//--------------------------------------------------
// Enums
//--------------------------------------------------
public:
enum numParams : uint8_t {
PARAM_NUMS_0 = 0,
PARAM_NUMS_1,
PARAM_NUMS_2,
PARAM_NUMS_3,
PARAM_NUMS_4,
PARAM_NUMS_5
};
enum lastParam : bool {
NO_LAST_PARAM = false,
LAST_PARAM = true,
};
//--------------------------------------------------
// Substructures
//--------------------------------------------------
public:
struct tParam {
uint8_t param_len;
uint8_t* param;
};
//--------------------------------------------------
// Variables
//--------------------------------------------------
private:
spi_inst_t *spi = spi0;
int8_t cs = DEFAULT_CS_PIN;
int8_t sck = DEFAULT_SCK_PIN;
int8_t mosi = DEFAULT_MOSI_PIN;
int8_t miso = DEFAULT_MISO_PIN;
int8_t resetn = DEFAULT_RESETN_PIN;
int8_t gpio0 = DEFAULT_GPIO0_PIN;
int8_t ack = DEFAULT_ACK_PIN;
//--------------------------------------------------
// Constructors/Destructor
//--------------------------------------------------
public:
SpiDrv() {}
SpiDrv(spi_inst_t *spi,
uint8_t cs, uint8_t sck, uint8_t mosi, uint8_t miso,
uint8_t resetn, uint8_t gpio0, uint8_t ack) :
spi(spi), cs(cs), sck(sck), mosi(mosi), miso(miso),
resetn(resetn), gpio0(gpio0), ack(ack) {}
//--------------------------------------------------
// Methods
//--------------------------------------------------
public:
void init();
void reset();
bool available();
void esp_select();
void esp_deselect();
bool get_esp_ready();
bool get_esp_ack();
void wait_for_esp_ack();
void wait_for_esp_ready();
void wait_for_esp_select();
int wait_for_byte(uint8_t wait_byte);
bool read_and_check_byte(uint8_t check_byte, uint8_t *byte_out);
uint8_t read_byte();
bool wait_response_params(uint8_t cmd, uint8_t num_param, tParam *params_out);
bool wait_response_cmd(uint8_t cmd, uint8_t num_param, uint8_t *param_out, uint8_t *param_len_out);
bool wait_response_data8(uint8_t cmd, uint8_t *param_out, uint8_t *param_len_out);
bool wait_response_data16(uint8_t cmd, uint8_t *param_out, uint16_t *param_len_out);
bool wait_response(uint8_t cmd, uint8_t *num_param_out, uint8_t **params_out, uint8_t max_num_params);
void send_param(const uint8_t* param, uint8_t param_len, lastParam last_param = NO_LAST_PARAM);
void send_param_len8(uint8_t param_len);
void send_param_len16(uint16_t param_len);
uint8_t read_param_len8(uint8_t *param_len_out = nullptr);
uint16_t read_param_len16(uint16_t *param_len_out = nullptr);
void send_buffer(const uint8_t *param, uint16_t param_len, lastParam last_param = NO_LAST_PARAM);
void send_param(uint16_t param, lastParam last_param = NO_LAST_PARAM);
void send_byte_param(uint8_t param, lastParam last_param = NO_LAST_PARAM);
void send_cmd(uint8_t cmd, uint8_t num_param);
void pad_to_multiple_of_4(int command_size);
private:
void get_param(uint8_t *param_out);
};
}