Cameron/pico-examples
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Update some of the SPI examples to use PICO_DEFAULT_SPI and binary_info

Browse Source
This commit is contained in:
Andrew Scheller
2021-03-04 11:53:48 +00:00
committed by Graham Sanderson
parent a5363d18a6
commit 83f0eed8c5
5 changed files with 92 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
spi/spi_flash/spi_flash.c
View File

@@ -8,6 +8,7 @@
#include <stdio.h>
#include "pico/stdlib.h"
#include "pico/binary_info.h"
#include "hardware/spi.h"
#define FLASH_PAGE_SIZE 256
@@ -21,11 +22,6 @@
#define FLASH_STATUS_BUSY_MASK 0x01
#define PIN_MISO 4
#define PIN_CS 5
#define PIN_SCK 6
#define PIN_MOSI 7
static inline void cs_select(uint cs_pin) {
asm volatile("nop \n nop \n nop"); // FIXME
gpio_put(cs_pin, 0);
@@ -110,19 +106,27 @@ void printbuf(uint8_t buf[FLASH_PAGE_SIZE]) {
int main() {
// Enable UART so we can print status output
stdio_init_all();
#if !defined(spi_default) || !defined(PICO_DEFAULT_SPI_SCK_PIN) || !defined(PICO_DEFAULT_SPI_TX_PIN) || !defined(PICO_DEFAULT_SPI_RX_PIN) || !defined(PICO_DEFAULT_SPI_CSN_PIN)
#warning spi/spi_flash example requires a board with SPI pins
puts("Default SPI pins were not defined");
#else
printf("SPI flash example\n");
// Enable SPI 0 at 1 MHz and connect to GPIOs
spi_init(spi0, 1000 * 1000);
gpio_set_function(PIN_MISO, GPIO_FUNC_SPI);
gpio_set_function(PIN_SCK, GPIO_FUNC_SPI);
gpio_set_function(PIN_MOSI, GPIO_FUNC_SPI);
spi_init(spi_default, 1000 * 1000);
gpio_set_function(PICO_DEFAULT_SPI_RX_PIN, GPIO_FUNC_SPI);
gpio_set_function(PICO_DEFAULT_SPI_SCK_PIN, GPIO_FUNC_SPI);
gpio_set_function(PICO_DEFAULT_SPI_TX_PIN, GPIO_FUNC_SPI);
// Make the SPI pins available to picotool
bi_decl(bi_3pins_with_func(PICO_DEFAULT_SPI_RX_PIN, PICO_DEFAULT_SPI_TX_PIN, PICO_DEFAULT_SPI_SCK_PIN, GPIO_FUNC_SPI));
// Chip select is active-low, so we'll initialise it to a driven-high state
gpio_init(PIN_CS);
gpio_put(PIN_CS, 1);
gpio_set_dir(PIN_CS, GPIO_OUT);
gpio_init(PICO_DEFAULT_SPI_CSN_PIN);
gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 1);
gpio_set_dir(PICO_DEFAULT_SPI_CSN_PIN, GPIO_OUT);
// Make the CS pin available to picotool
bi_decl(bi_1pin_with_name(PICO_DEFAULT_SPI_CSN_PIN, "CS"));
printf("SPI initialised, let's goooooo\n");
@@ -130,25 +134,26 @@ int main() {
const uint32_t target_addr = 0;
flash_sector_erase(spi0, PIN_CS, target_addr);
flash_read(spi0, PIN_CS, target_addr, page_buf, FLASH_PAGE_SIZE);
flash_sector_erase(spi_default, PICO_DEFAULT_SPI_CSN_PIN, target_addr);
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, target_addr, page_buf, FLASH_PAGE_SIZE);
printf("After erase:\n");
printbuf(page_buf);
for (int i = 0; i < FLASH_PAGE_SIZE; ++i)
page_buf[i] = i;
flash_page_program(spi0, PIN_CS, target_addr, page_buf);
flash_read(spi0, PIN_CS, target_addr, page_buf, FLASH_PAGE_SIZE);
flash_page_program(spi_default, PICO_DEFAULT_SPI_CSN_PIN, target_addr, page_buf);
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, target_addr, page_buf, FLASH_PAGE_SIZE);
printf("After program:\n");
printbuf(page_buf);
flash_sector_erase(spi0, PIN_CS, target_addr);
flash_read(spi0, PIN_CS, target_addr, page_buf, FLASH_PAGE_SIZE);
flash_sector_erase(spi_default, PICO_DEFAULT_SPI_CSN_PIN, target_addr);
flash_read(spi_default, PICO_DEFAULT_SPI_CSN_PIN, target_addr, page_buf, FLASH_PAGE_SIZE);
printf("Erase again:\n");
printbuf(page_buf);
return 0;
#endif
}