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Maximilian Friedersdorff 2021-10-31 15:26:17 +00:00
commit e69362c8ed
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16
CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 3.13)
include(pico_sdk_import.cmake)
project(lanthanide_pdu)
pico_sdk_init()
add_executable(pdu
pdu.c
uart.h
uart.c
)
target_link_libraries(pdu pico_stdlib)

103
pdu.c Normal file
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#include <stdio.h>
#include <string.h>
#include "uart.h"
#include "pico/stdlib.h"
#include "hardware/uart.h"
#define UART_ID uart0
#define DATA_BITS 8
#define STOP_BITS 1
#define PARITY UART_PARITY_NONE
#define UART_TX_PIN 16
#define UART_RX_PIN 17
#define MAX_COMMAND_LENGTH 32
#define PINA 6
#define PINB 7
#define PINC 8
#define PIND 9
void set_power_state(char relay, bool on) {
uint state;
if (on)
state = 0;
else
state = 1;
uint pin;
switch (relay) {
case 'a' :
pin = PINA;
break;
case 'b' :
pin = PINB;
break;
case 'c' :
pin = PINC;
break;
case 'd' :
pin = PIND;
break;
}
gpio_put(pin, state);
}
int main() {
char command_string[MAX_COMMAND_LENGTH + 1];
command_string[0] = 0;
uint command_len = 0;
uart_init(UART_ID, 9600);
gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);
uart_set_hw_flow(UART_ID, false, false);
uart_set_format(UART_ID, DATA_BITS, STOP_BITS, PARITY);
gpio_init(PINA);
gpio_init(PINB);
gpio_init(PINC);
gpio_init(PIND);
gpio_set_dir(PINA, GPIO_OUT);
gpio_set_dir(PINB, GPIO_OUT);
gpio_set_dir(PINC, GPIO_OUT);
gpio_set_dir(PIND, GPIO_OUT);
gpio_put(PINA, 1);
gpio_put(PINB, 1);
gpio_put(PINC, 1);
gpio_put(PIND, 1);
bool eol;
char word[9];
char relay;
while (true) {
read_word(UART_ID, word, 9, &eol);
if (strcmp(word, "on") == 0) {
if (eol) {
uart_puts(UART_ID, "Missing argument: n");
continue;
}
relay = uart_getc(UART_ID);
finish_line(UART_ID);
set_power_state(relay, true);
} else if (strcmp(word, "off") == 0) {
if (eol) {
uart_puts(UART_ID, "Missing argument: n");
continue;
}
relay = uart_getc(UART_ID);
finish_line(UART_ID);
set_power_state(relay, false);
} else if (strcmp(word, "temps") == 0) {
uart_puts(UART_ID, "Not implemented yet");
}
}
}

62
pico_sdk_import.cmake Normal file
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# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
# This can be dropped into an external project to help locate this SDK
# It should be include()ed prior to project()
if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
endif ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
endif ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
endif ()
set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
if (NOT PICO_SDK_PATH)
if (PICO_SDK_FETCH_FROM_GIT)
include(FetchContent)
set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
if (PICO_SDK_FETCH_FROM_GIT_PATH)
get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
endif ()
FetchContent_Declare(
pico_sdk
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG master
)
if (NOT pico_sdk)
message("Downloading Raspberry Pi Pico SDK")
FetchContent_Populate(pico_sdk)
set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
endif ()
set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
else ()
message(FATAL_ERROR
"SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
)
endif ()
endif ()
get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
if (NOT EXISTS ${PICO_SDK_PATH})
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
endif ()
set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
endif ()
set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
include(${PICO_SDK_INIT_CMAKE_FILE})

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uart.c Normal file
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#include "uart.h"
#include "hardware/uart.h"
bool is_whitespace(char character) {
switch (character) {
case ' ' :
case '\n' :
case '\t' :
return true;
default :
return false;
}
}
void read_word(uart_inst_t *uart, char *buffer, int buffersize, bool *eol) {
for (uint i == 0; i < buffersize - 1; ++i) {
buffer[i] = uart_getc(uart);
if (is_whitespace(buffer[i])) {
buffer[i + 1] = '\0'
}
}
char last_char;
do {
last_char = uart_getc(uart);
} while (is_whitespace(last_char));
buffer[buffersize - 1] = '\0';
}
void finish_line(uart_inst_t *uart) {
char last_char;
do {
last_char = uart_getc(uart);
} while (last_char != '\n');
}

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uart.h Normal file
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#ifndef LANTHANIDE_UART
#define LANTHANIDE_UART
#include "pico/stdlib.h"
bool is_whitespace(char character);
void read_word(uart_inst_t *uart, char *buffer, int buffersize, bool *eol);
void finish_line(uart_inst_t *uart);
#endif