stefank/rpi_pico_mfrc522
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Initial SPI integration. Known issue: RC522 reports invalid version id.

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This commit is contained in:
Stefan Kratochwil
2024-05-16 21:44:29 +02:00
parent 32c0865e32
commit 8ac8726904
1 changed files with 39 additions and 4 deletions
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43
third_party/mfrc522_integration/mfrc522_rp2040_integration.c vendored
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@@ -45,12 +45,35 @@
#include "driver_mfrc522_interface.h"
#define MFRC522_CFG_RST_GPIO 9
#define MFRC522_CFG_SPI_INSTANCE spi1
#define MFRC522_CFG_SPI_MISO_GPIO 12
#define MFRC522_CFG_SPI_MOSI_GPIO 11
#define MFRC522_CFG_SPI_CLK_GPIO 10
#define MFRC522_CFG_SPI_SS_GPIO 13
#define MFRC522_CFG_SPI_SPEED_MHZ (1000 * 1000)
/**
* @brief Helper function to pull the CS line low
*
* Taken from pico-examples, bme280_spi.c
*/
static inline void cs_select() {
asm volatile("nop \n nop \n nop");
gpio_put(MFRC522_CFG_SPI_SS_GPIO, 0); // Active low
asm volatile("nop \n nop \n nop");
}
/**
* @brief Helper function to release the CS line low
*
* Taken from pico-examples, bme280_spi.c
*/
static inline void cs_deselect() {
asm volatile("nop \n nop \n nop");
gpio_put(MFRC522_CFG_SPI_SS_GPIO, 1);
asm volatile("nop \n nop \n nop");
}
/**
* @brief interface reset gpio init
* @return status code
@@ -164,14 +187,19 @@ uint8_t mfrc522_interface_spi_init(void)
gpio_set_function(MFRC522_CFG_SPI_MISO_GPIO, GPIO_FUNC_SPI);
gpio_set_function(MFRC522_CFG_SPI_MOSI_GPIO, GPIO_FUNC_SPI);
gpio_set_function(MFRC522_CFG_SPI_CLK_GPIO, GPIO_FUNC_SPI);
gpio_set_function(MFRC522_CFG_SPI_SS_GPIO, GPIO_FUNC_SPI);
//gpio_set_function(MFRC522_CFG_SPI_SS_GPIO, GPIO_FUNC_SPI);
//gpio_set_dir(MFRC522_CFG_SPI_CLK_GPIO, GPIO_OUT);
gpio_init(MFRC522_CFG_SPI_SS_GPIO);
gpio_set_dir(MFRC522_CFG_SPI_SS_GPIO, GPIO_OUT);
gpio_put(MFRC522_CFG_SPI_SS_GPIO, 1);
/*
* From the manual:
* "There is no guarantee that the baudrate requested can be achieved exactly;
* the nearest will be chosen and returned"
*/
return !spi_init(spi0, MFRC522_CFG_SPI_SPEED_MHZ);
return !spi_init(MFRC522_CFG_SPI_INSTANCE, MFRC522_CFG_SPI_SPEED_MHZ);
}
/**
@@ -183,6 +211,7 @@ uint8_t mfrc522_interface_spi_init(void)
*/
uint8_t mfrc522_interface_spi_deinit(void)
{
mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
return 0;
}
@@ -198,7 +227,10 @@ uint8_t mfrc522_interface_spi_deinit(void)
*/
uint8_t mfrc522_interface_spi_read(uint8_t reg, uint8_t *buf, uint16_t len)
{
return 0;
cs_select();
uint16_t n_bytes_read = spi_read_blocking(MFRC522_CFG_SPI_INSTANCE, reg, buf, len);
cs_deselect();
return (uint8_t) (n_bytes_read == len) ? 0 : 1;
}
/**
@@ -213,7 +245,10 @@ uint8_t mfrc522_interface_spi_read(uint8_t reg, uint8_t *buf, uint16_t len)
*/
uint8_t mfrc522_interface_spi_write(uint8_t reg, uint8_t *buf, uint16_t len)
{
return 0;
cs_select();
uint16_t n_bytes_written = spi_write_blocking(MFRC522_CFG_SPI_INSTANCE, buf, len);
cs_deselect();
return (uint8_t) (n_bytes_written == len) ? 0 : 1;
}
/**