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fix(UART FIFO): 

Removed Buffer clearing
Disabled UART FIFO
This commit is contained in:
Devoalda 2023-09-06 19:09:57 +08:00
parent e6665c2195
commit 59fa7829da
1 changed files with 5 additions and 12 deletions
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17
lab_2/lab_2.c
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@ -7,10 +7,10 @@
#include <stdio.h> #include <stdio.h>
#include "pico/stdlib.h" #include "pico/stdlib.h"
#include "hardware/uart.h"
#define UART_ID uart0 #define UART_ID uart0
#define BAUD_RATE 115200 // Baud rate of UART #define BAUD_RATE 115200 // Baud rate of UART
#define UART_BUF_SIZE 64 // Buffer size for UART
#define UART_TX_PIN 16 // GPIO for UART TX pin #define UART_TX_PIN 16 // GPIO for UART TX pin
#define UART_RX_PIN 17 // GPIO for UART RX pin #define UART_RX_PIN 17 // GPIO for UART RX pin
@ -33,15 +33,6 @@ static void uart_transmit(char *uart_input) {
} }
} }
/**
* Clear buffer (read until buffer size is UART_BUF_SIZE)
* This is to prevent the program from printing out garbage
* for the first few characters received or during pseudo button press
* @return void
*/
static void uart_buf_clr() {
while (uart_is_readable(UART_ID) && uart_getc(UART_ID) != UART_BUF_SIZE);
}
/** /**
* Receives a character through UART0 and prints it out * Receives a character through UART0 and prints it out
@ -60,8 +51,6 @@ static void uart_receive(char *uart_output) {
*uart_output = '2'; // If '1' is received, print '2' *uart_output = '2'; // If '1' is received, print '2'
} }
uart_buf_clr(); // Clear buffer
printf("%c\n", *uart_output); printf("%c\n", *uart_output);
} }
} }
@ -76,11 +65,15 @@ static void pin_init() {
gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART); gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART); gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);
// Disable UART FIFO for data to be tx/rx immediately
uart_set_fifo_enabled(UART_ID, false);
// Pseudo button init // Pseudo button init
gpio_set_dir(PSEUDO_BTN, GPIO_IN); gpio_set_dir(PSEUDO_BTN, GPIO_IN);
// Enable pull up resistor // Enable pull up resistor
gpio_set_pulls(PSEUDO_BTN, true, false); gpio_set_pulls(PSEUDO_BTN, true, false);
} }
int main() { int main() {