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pico-serprog
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pico-serprog/main.c

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/**
* Copyright (C) 2021, Mate Kukri <km@mkukri.xyz>
* Copyright (C) 2023, 2024, Riku Viitanen <riku.viitanen@protonmail.com>
* Based on "pico-serprog" by Thomas Roth <code@stacksmashing.net>
*
* Licensed under GPLv3
*
* Also based on stm32-vserprog:
* https://github.com/dword1511/stm32-vserprog
*/
#define DESCRIPTION "SPI flash chip programmer using Flashprog's serprog protocol"
#define WEBSITE "https://codeberg.org/Riku_V/pico-serprog/"
#include "pico/stdlib.h"
#include "pico/binary_info.h"
#include "hardware/spi.h"
#include "tusb.h"
#include "serprog.h"
#define CDC_ITF 0 /* USB CDC interface no */
#define SPI_IF spi0 /* Which PL022 to use */
#define SPI_CS_0 5 /* The default CS pin */
#define SPI_MISO 4
#define SPI_MOSI 3
#define SPI_SCK 2
uint8_t spi_enabled = 0;
uint cs_pin = SPI_CS_0;
#define NUM_CS_AVAILABLE 4 /* Number of usable chip selects */
uint baud = 12000000; /* Default to 12MHz */
static const char progname[16] = "pico-serprog";
/* Map of supported serprog commands */
static const uint32_t cmdmap[8] = {
(1 << S_CMD_NOP) |
(1 << S_CMD_Q_IFACE) |
(1 << S_CMD_Q_CMDMAP) |
(1 << S_CMD_Q_PGMNAME) |
(1 << S_CMD_Q_SERBUF) |
(1 << S_CMD_Q_BUSTYPE) |
(1 << S_CMD_SYNCNOP) |
(1 << S_CMD_O_SPIOP) |
(1 << S_CMD_S_BUSTYPE) |
(1 << S_CMD_S_SPI_FREQ) |
(1 << S_CMD_S_PIN_STATE) |
(1 << S_CMD_S_SPI_CS)
};
static void use_cs(uint pin) {
gpio_put(pin, 1);
gpio_set_dir(pin, GPIO_OUT);
gpio_set_drive_strength(pin, GPIO_DRIVE_STRENGTH_12MA);
}
static void pullup_cs(uint pin) {
gpio_set_dir(pin, GPIO_IN);
gpio_pull_up(pin);
}
static void enable_spi() {
#ifdef PICO_DEFAULT_LED_PIN
/* Setup status LED */
gpio_init(PICO_DEFAULT_LED_PIN);
gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
#endif
/* Setup default CS as output, others as inputs with pull-ups */
for (uint8_t i = SPI_CS_0+1; i<SPI_CS_0+NUM_CS_AVAILABLE; i++) {
gpio_init(i);
pullup_cs(i);
}
gpio_init(cs_pin);
use_cs(cs_pin);
/* Setup PL022 */
spi_init(SPI_IF, baud);
gpio_set_function(SPI_MISO, GPIO_FUNC_SPI);
gpio_set_function(SPI_MOSI, GPIO_FUNC_SPI);
gpio_set_function(SPI_SCK, GPIO_FUNC_SPI);
gpio_set_drive_strength(SPI_MISO, GPIO_DRIVE_STRENGTH_12MA);
gpio_set_drive_strength(SPI_MOSI, GPIO_DRIVE_STRENGTH_12MA);
gpio_set_drive_strength(SPI_SCK, GPIO_DRIVE_STRENGTH_12MA);
spi_enabled = 1;
}
static void disable_pin(uint pin) {
gpio_init(pin); /* Set pin to SIO input */
gpio_set_pulls(pin, 0, 0); /* Disable all pulls */
}
static void disable_spi() {
for (uint8_t i=0; i<NUM_CS_AVAILABLE; i++)
disable_pin(SPI_CS_0 + i);
disable_pin(SPI_MISO);
disable_pin(SPI_MOSI);
disable_pin(SPI_SCK);
/* Disable SPI peripheral */
spi_deinit(SPI_IF);
spi_enabled = 0;
}
static inline void cs_select(uint cs_pin) {
asm volatile("nop \n nop \n nop"); /* FIXME */
gpio_put(cs_pin, 0);
asm volatile("nop \n nop \n nop"); /* FIXME */
}
static inline void cs_deselect(uint cs_pin) {
asm volatile("nop \n nop \n nop"); /* FIXME */
gpio_put(cs_pin, 1);
asm volatile("nop \n nop \n nop"); /* FIXME */
}
static void wait_for_read(void) {
do
tud_task();
while (!tud_cdc_n_available(CDC_ITF));
}
static inline void readbytes_blocking(void *b, uint32_t len) {
while (len) {
wait_for_read();
uint32_t r = tud_cdc_n_read(CDC_ITF, b, len);
b += r;
len -= r;
}
}
static inline uint8_t readbyte_blocking(void) {
wait_for_read();
uint8_t b;
tud_cdc_n_read(CDC_ITF, &b, 1);
return b;
}
static void wait_for_write(void) {
do {
tud_task();
} while (!tud_cdc_n_write_available(CDC_ITF));
}
static inline void sendbytes_blocking(const void *b, uint32_t len) {
while (len) {
wait_for_write();
uint32_t w = tud_cdc_n_write(CDC_ITF, b, len);
b += w;
len -= w;
}
}
static inline void sendbyte_blocking(uint8_t b) {
wait_for_write();
tud_cdc_n_write(CDC_ITF, &b, 1);
}
void s_cmd_s_bustype() {
/* If SPI is among the requsted bus types we succeed,
* fail otherwise */
if ((uint8_t) readbyte_blocking() & (1 << 3))
sendbyte_blocking(S_ACK);
else
sendbyte_blocking(S_NAK);
}
void s_cmd_o_spiop() {
static uint8_t buf[4096];
uint32_t wlen, rlen;
readbytes_blocking(&wlen, 3);
readbytes_blocking(&rlen, 3);
cs_select(cs_pin);
while (wlen) {
uint32_t cur = MIN(wlen, sizeof buf);
readbytes_blocking(buf, cur);
spi_write_blocking(SPI_IF, buf, cur);
wlen -= cur;
}
sendbyte_blocking(S_ACK);
while (rlen) {
uint32_t cur = MIN(rlen, sizeof buf);
spi_read_blocking(SPI_IF, 0, buf, cur);
sendbytes_blocking(buf, cur);
rlen -= cur;
}
cs_deselect(cs_pin);
}
void s_cmd_s_spi_freq() {
uint32_t want_baud;
readbytes_blocking(&want_baud, 4);
if (want_baud) {
/* Set frequency */
baud = spi_set_baudrate(SPI_IF, want_baud);
/* Send back actual value */
sendbyte_blocking(S_ACK);
sendbytes_blocking(&baud, 4);
} else {
/* 0 Hz is reserved */
sendbyte_blocking(S_NAK);
}
}
void s_cmd_s_pin_state() {
if (readbyte_blocking())
enable_spi();
else
disable_spi();
sendbyte_blocking(S_ACK);
}
void s_cmd_s_spi_cs() {
uint8_t cs = readbyte_blocking();
if (cs >= NUM_CS_AVAILABLE)
sendbyte_blocking(S_NAK);
return;
cs += SPI_CS_0;
if (spi_enabled) {
if (cs_pin != cs) {
pullup_cs(cs_pin);
use_cs(cs);
}
}
cs_pin = cs;
sendbyte_blocking(S_ACK);
}
static void command_loop() {
while (1) {
uint8_t cmd = readbyte_blocking();
#ifdef PICO_DEFAULT_LED_PIN
gpio_put(PICO_DEFAULT_LED_PIN, 1);
#endif
switch (cmd) {
case S_CMD_NOP:
sendbyte_blocking(S_ACK);
break;
case S_CMD_Q_IFACE:
sendbyte_blocking(S_ACK);
sendbyte_blocking(0x01);
sendbyte_blocking(0x00);
break;
case S_CMD_Q_CMDMAP:
sendbyte_blocking(S_ACK);
sendbytes_blocking((uint8_t *)cmdmap, sizeof(cmdmap));
break;
case S_CMD_Q_PGMNAME:
sendbyte_blocking(S_ACK);
sendbytes_blocking(progname, sizeof(progname));
break;
case S_CMD_Q_SERBUF:
sendbyte_blocking(S_ACK);
sendbyte_blocking(0xFF);
sendbyte_blocking(0xFF);
break;
case S_CMD_Q_BUSTYPE:
sendbyte_blocking(S_ACK);
sendbyte_blocking((1 << 3)); /* SPI */
break;
case S_CMD_SYNCNOP:
sendbyte_blocking(S_NAK);
sendbyte_blocking(S_ACK);
break;
case S_CMD_S_BUSTYPE:
s_cmd_s_bustype();
break;
case S_CMD_O_SPIOP:
s_cmd_o_spiop();
break;
case S_CMD_S_SPI_FREQ:
s_cmd_s_spi_freq();
break;
case S_CMD_S_PIN_STATE:
s_cmd_s_pin_state();
break;
case S_CMD_S_SPI_CS:
s_cmd_s_spi_cs();
break;
default:
sendbyte_blocking(S_NAK);
}
tud_cdc_n_write_flush(CDC_ITF);
#ifdef PICO_DEFAULT_LED_PIN
gpio_put(PICO_DEFAULT_LED_PIN, 0);
#endif
}
}
int main() {
/* Metadata for picotool */
bi_decl(bi_program_description(DESCRIPTION));
bi_decl(bi_program_url(WEBSITE));
#ifdef PICO_DEFAULT_LED_PIN
bi_decl(bi_1pin_with_name(PICO_DEFAULT_LED_PIN, "Activity LED"));
#endif
bi_decl(bi_1pin_with_name(SPI_MISO, "MISO"));
bi_decl(bi_1pin_with_name(SPI_MOSI, "MOSI"));
bi_decl(bi_1pin_with_name(SPI_SCK, "SCK"));
bi_decl(bi_1pin_with_name(SPI_CS_0, "CS_0 (default)"));
bi_decl(bi_1pin_with_name(SPI_CS_0+1, "CS_1"));
bi_decl(bi_1pin_with_name(SPI_CS_0+2, "CS_2"));
bi_decl(bi_1pin_with_name(SPI_CS_0+3, "CS_3"));
/* Setup USB */
tusb_init();
/* Setup PL022 SPI */
enable_spi(baud);
command_loop();
}
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