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Update some of the SPI examples to use PICO_DEFAULT_SPI and binary_info

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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
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37
spi/spi_dma/spi_dma.c
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@@ -9,37 +9,39 @@
#include <stdio.h>
#include <stdlib.h>
#include "pico/stdlib.h"
#include "pico/binary_info.h"
#include "hardware/spi.h"
#include "hardware/dma.h"
#define PIN_MISO 16
#define PIN_CS 17
#define PIN_SCK 18
#define PIN_MOSI 19
#define SPI_INST spi0
#define TEST_SIZE 1024
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_dma example requires a board with SPI pins
puts("Default SPI pins were not defined");
#else
printf("SPI DMA example\n");
// Enable SPI at 1 MHz and connect to GPIOs
spi_init(SPI_INST, 1000 * 1000);
gpio_set_function(PIN_MISO, GPIO_FUNC_SPI);
gpio_init(PIN_CS);
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_init(PICO_DEFAULT_SPI_CSN_PIN);
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));
// Make the CS pin available to picotool
bi_decl(bi_1pin_with_name(PICO_DEFAULT_SPI_CSN_PIN, "CS"));
// Grab some unused dma channels
const uint dma_tx = dma_claim_unused_channel(true);
const uint dma_rx = dma_claim_unused_channel(true);
// Force loopback for testing (I don't have an SPI device handy)
hw_set_bits(&spi_get_hw(SPI_INST)->cr1, SPI_SSPCR1_LBM_BITS);
hw_set_bits(&spi_get_hw(spi_default)->cr1, SPI_SSPCR1_LBM_BITS);
static uint8_t txbuf[TEST_SIZE];
static uint8_t rxbuf[TEST_SIZE];
@@ -54,9 +56,9 @@ int main() {
printf("Configure TX DMA\n");
dma_channel_config c = dma_channel_get_default_config(dma_tx);
channel_config_set_transfer_data_size(&c, DMA_SIZE_8);
channel_config_set_dreq(&c, spi_get_index(SPI_INST) ? DREQ_SPI1_TX : DREQ_SPI0_TX);
channel_config_set_dreq(&c, spi_get_index(spi_default) ? DREQ_SPI1_TX : DREQ_SPI0_TX);
dma_channel_configure(dma_tx, &c,
&spi_get_hw(SPI_INST)->dr, // write address
&spi_get_hw(spi_default)->dr, // write address
txbuf, // read address
TEST_SIZE, // element count (each element is of size transfer_data_size)
false); // don't start yet
@@ -68,12 +70,12 @@ int main() {
// address to increment (so data is written throughout the buffer)
c = dma_channel_get_default_config(dma_rx);
channel_config_set_transfer_data_size(&c, DMA_SIZE_8);
channel_config_set_dreq(&c, spi_get_index(SPI_INST) ? DREQ_SPI1_RX : DREQ_SPI0_RX);
channel_config_set_dreq(&c, spi_get_index(spi_default) ? DREQ_SPI1_RX : DREQ_SPI0_RX);
channel_config_set_read_increment(&c, false);
channel_config_set_write_increment(&c, true);
dma_channel_configure(dma_rx, &c,
rxbuf, // write address
&spi_get_hw(SPI_INST)->dr, // read address
&spi_get_hw(spi_default)->dr, // read address
TEST_SIZE, // element count (each element is of size transfer_data_size)
false); // don't start yet
@@ -100,4 +102,5 @@ int main() {
dma_channel_unclaim(dma_tx);
dma_channel_unclaim(dma_rx);
return 0;
#endif
}