drivers/bus: Add QSPI abstract type with software QSPI implementation.

A new directory drivers/bus/ is introduced, which can hold implementations
of bus drivers.  A software QSPI implementation is added.
crypto-aes
Damien George 5 years ago
parent 9884a2c712
commit 1da2d45de6
  1. 57
      drivers/bus/qspi.h
  2. 203
      drivers/bus/softqspi.c

@ -0,0 +1,57 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017-2018 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef MICROPY_INCLUDED_DRIVERS_BUS_QSPI_H
#define MICROPY_INCLUDED_DRIVERS_BUS_QSPI_H
#include "py/mphal.h"
enum {
MP_QSPI_IOCTL_INIT,
MP_QSPI_IOCTL_DEINIT,
MP_QSPI_IOCTL_BUS_ACQUIRE,
MP_QSPI_IOCTL_BUS_RELEASE,
};
typedef struct _mp_qspi_proto_t {
int (*ioctl)(void *self, uint32_t cmd);
void (*write_cmd_data)(void *self, uint8_t cmd, size_t len, uint32_t data);
void (*write_cmd_addr_data)(void *self, uint8_t cmd, uint32_t addr, size_t len, const uint8_t *src);
uint32_t (*read_cmd)(void *self, uint8_t cmd, size_t len);
void (*read_cmd_qaddr_qdata)(void *self, uint8_t cmd, uint32_t addr, size_t len, uint8_t *dest);
} mp_qspi_proto_t;
typedef struct _mp_soft_qspi_obj_t {
mp_hal_pin_obj_t cs;
mp_hal_pin_obj_t clk;
mp_hal_pin_obj_t io0;
mp_hal_pin_obj_t io1;
mp_hal_pin_obj_t io2;
mp_hal_pin_obj_t io3;
} mp_soft_qspi_obj_t;
extern const mp_qspi_proto_t mp_soft_qspi_proto;
#endif // MICROPY_INCLUDED_DRIVERS_BUS_QSPI_H

@ -0,0 +1,203 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017-2018 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "drivers/bus/qspi.h"
#define CS_LOW(self) mp_hal_pin_write(self->cs, 0)
#define CS_HIGH(self) mp_hal_pin_write(self->cs, 1)
#ifdef MICROPY_HW_SOFTQSPI_SCK_LOW
// Use externally provided functions for SCK control and IO reading
#define SCK_LOW(self) MICROPY_HW_SOFTQSPI_SCK_LOW(self)
#define SCK_HIGH(self) MICROPY_HW_SOFTQSPI_SCK_HIGH(self)
#define NIBBLE_READ(self) MICROPY_HW_SOFTQSPI_NIBBLE_READ(self)
#else
// Use generic pin functions for SCK control and IO reading
#define SCK_LOW(self) mp_hal_pin_write(self->clk, 0)
#define SCK_HIGH(self) mp_hal_pin_write(self->clk, 1)
#define NIBBLE_READ(self) ( \
mp_hal_pin_read(self->io0) \
| (mp_hal_pin_read(self->io1) << 1) \
| (mp_hal_pin_read(self->io2) << 2) \
| (mp_hal_pin_read(self->io3) << 3))
#endif
STATIC void nibble_write(mp_soft_qspi_obj_t *self, uint8_t v) {
mp_hal_pin_write(self->io0, v & 1);
mp_hal_pin_write(self->io1, (v >> 1) & 1);
mp_hal_pin_write(self->io2, (v >> 2) & 1);
mp_hal_pin_write(self->io3, (v >> 3) & 1);
}
STATIC int mp_soft_qspi_ioctl(void *self_in, uint32_t cmd) {
mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
switch (cmd) {
case MP_QSPI_IOCTL_INIT:
mp_hal_pin_high(self->cs);
mp_hal_pin_output(self->cs);
// Configure pins
mp_hal_pin_write(self->clk, 0);
mp_hal_pin_output(self->clk);
//mp_hal_pin_write(self->clk, 1);
mp_hal_pin_output(self->io0);
mp_hal_pin_input(self->io1);
mp_hal_pin_write(self->io2, 1);
mp_hal_pin_output(self->io2);
mp_hal_pin_write(self->io3, 1);
mp_hal_pin_output(self->io3);
break;
}
return 0; // success
}
STATIC void mp_soft_qspi_transfer(mp_soft_qspi_obj_t *self, size_t len, const uint8_t *src, uint8_t *dest) {
// Will run as fast as possible, limited only by CPU speed and GPIO time
mp_hal_pin_input(self->io1);
mp_hal_pin_output(self->io0);
if (self->io3) {
mp_hal_pin_write(self->io2, 1);
mp_hal_pin_output(self->io2);
mp_hal_pin_write(self->io3, 1);
mp_hal_pin_output(self->io3);
}
if (src) {
for (size_t i = 0; i < len; ++i) {
uint8_t data_out = src[i];
uint8_t data_in = 0;
for (int j = 0; j < 8; ++j, data_out <<= 1) {
mp_hal_pin_write(self->io0, (data_out >> 7) & 1);
mp_hal_pin_write(self->clk, 1);
data_in = (data_in << 1) | mp_hal_pin_read(self->io1);
mp_hal_pin_write(self->clk, 0);
}
if (dest != NULL) {
dest[i] = data_in;
}
}
} else {
for (size_t i = 0; i < len; ++i) {
uint8_t data_in = 0;
for (int j = 0; j < 8; ++j) {
mp_hal_pin_write(self->clk, 1);
data_in = (data_in << 1) | mp_hal_pin_read(self->io1);
mp_hal_pin_write(self->clk, 0);
}
if (dest != NULL) {
dest[i] = data_in;
}
}
}
}
STATIC void mp_soft_qspi_qread(mp_soft_qspi_obj_t *self, size_t len, uint8_t *buf) {
// Make all IO lines input
mp_hal_pin_input(self->io2);
mp_hal_pin_input(self->io3);
mp_hal_pin_input(self->io0);
mp_hal_pin_input(self->io1);
// Will run as fast as possible, limited only by CPU speed and GPIO time
while (len--) {
SCK_HIGH(self);
uint8_t data_in = NIBBLE_READ(self);
SCK_LOW(self);
SCK_HIGH(self);
*buf++ = (data_in << 4) | NIBBLE_READ(self);
SCK_LOW(self);
}
}
STATIC void mp_soft_qspi_qwrite(mp_soft_qspi_obj_t *self, size_t len, const uint8_t *buf) {
// Make all IO lines output
mp_hal_pin_output(self->io2);
mp_hal_pin_output(self->io3);
mp_hal_pin_output(self->io0);
mp_hal_pin_output(self->io1);
// Will run as fast as possible, limited only by CPU speed and GPIO time
for (size_t i = 0; i < len; ++i) {
nibble_write(self, buf[i] >> 4);
SCK_HIGH(self);
SCK_LOW(self);
nibble_write(self, buf[i]);
SCK_HIGH(self);
SCK_LOW(self);
}
//mp_hal_pin_input(self->io1);
}
STATIC void mp_soft_qspi_write_cmd_data(void *self_in, uint8_t cmd, size_t len, uint32_t data) {
mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
uint32_t cmd_buf = cmd | data << 8;
CS_LOW(self);
mp_soft_qspi_transfer(self, 1 + len, (uint8_t*)&cmd_buf, NULL);
CS_HIGH(self);
}
STATIC void mp_soft_qspi_write_cmd_addr_data(void *self_in, uint8_t cmd, uint32_t addr, size_t len, const uint8_t *src) {
mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
uint8_t cmd_buf[4] = {cmd, addr >> 16, addr >> 8, addr};
CS_LOW(self);
mp_soft_qspi_transfer(self, 4, cmd_buf, NULL);
mp_soft_qspi_transfer(self, len, src, NULL);
CS_HIGH(self);
}
STATIC uint32_t mp_soft_qspi_read_cmd(void *self_in, uint8_t cmd, size_t len) {
mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
uint32_t cmd_buf = cmd;
CS_LOW(self);
mp_soft_qspi_transfer(self, 1 + len, (uint8_t*)&cmd_buf, (uint8_t*)&cmd_buf);
CS_HIGH(self);
return cmd_buf >> 8;
}
STATIC void mp_soft_qspi_read_cmd_qaddr_qdata(void *self_in, uint8_t cmd, uint32_t addr, size_t len, uint8_t *dest) {
mp_soft_qspi_obj_t *self = (mp_soft_qspi_obj_t*)self_in;
uint8_t cmd_buf[7] = {cmd, addr >> 16, addr >> 8, addr};
CS_LOW(self);
mp_soft_qspi_transfer(self, 1, cmd_buf, NULL);
mp_soft_qspi_qwrite(self, 6, &cmd_buf[1]); // 3 addr bytes, 1 extra byte (0), 2 dummy bytes (4 dummy cycles)
mp_soft_qspi_qread(self, len, dest);
CS_HIGH(self);
}
const mp_qspi_proto_t mp_soft_qspi_proto = {
.ioctl = mp_soft_qspi_ioctl,
.write_cmd_data = mp_soft_qspi_write_cmd_data,
.write_cmd_addr_data = mp_soft_qspi_write_cmd_addr_data,
.read_cmd = mp_soft_qspi_read_cmd,
.read_cmd_qaddr_qdata = mp_soft_qspi_read_cmd_qaddr_qdata,
};
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