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refactor(Code Standard): 

Modified code according to standards
This commit is contained in:
Devoalda 2023-09-06 21:31:16 +08:00
parent 59fa7829da
commit b90fe403f5
1 changed files with 36 additions and 25 deletions
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55
lab_2/lab_2.c
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@ -16,39 +16,50 @@
#define UART_RX_PIN 17 // GPIO for UART RX pin
#define PSEUDO_BTN 15 // GPIO for pseudo button
#define SLEEP_TIME 1000 // For testing can use a smaller value
// 1000ms is based on the lab requirements
#define SLEEP_TIME 1000 // 1000ms is based on the lab requirements
/**
* Sends a character through UART0 based on the state of GPIO15 (Pseudo button)
* @param uart_input Pointer to a character to be sent through UART0 (Space optimisation)
* @param uart_input Pointer to a character to be sent through UART0
* @return void Prints the character in uart_receive()
*/
static void uart_transmit(char *uart_input) {
if (gpio_get(PSEUDO_BTN)) { // If GPIO15 is high
static void uart_transmit(u_char *uart_input) {
if (gpio_get(PSEUDO_BTN))
{
uart_putc(UART_ID, '1');
} else { // If GPIO15 is low
}
else
{
uart_putc(UART_ID, *uart_input);
*uart_input = (*uart_input - 'A' + 1) % 26 + 'A'; // Next character and wrap around back to A
}
}
/**
* Receives a character through UART0 and prints it out
* NOTE: Flipping bit 5 effectively converts a character to lowercase
* @param uart_output Pointer to a location to store the received character (Space optimisation)
* EXAMPLE: 'A' = 0b01000001, 'a' = 0b01100001
* @param uart_output Pointer to a location to store the received character
* @return void Character is read and printed
*/
static void uart_receive(char *uart_output) {
if (uart_is_readable(UART_ID)) {
static void uart_receive(u_char *uart_output) {
if (uart_is_readable(UART_ID))
{
*uart_output = uart_getc(UART_ID);
if (*uart_output >= 'A' && *uart_output <= 'Z') {
*uart_output ^= (1 << 5); // XOR with 32 to convert to lowercase
// This operation flips bit 5
} else if (*uart_output == '1') {
*uart_output = '2'; // If '1' is received, print '2'
if ((*uart_output >= 'A') && (*uart_output <= 'Z'))
{
*uart_output ^= (1 << 5); // This operation flips bit 5
}
else if (*uart_output == '1')
{
*uart_output = '2';
}
else
{
return;
}
printf("%c\n", *uart_output);
@ -77,20 +88,20 @@ static void pin_init() {
}
int main() {
// Initialize stdio and pins first
stdio_init_all();
pin_init();
u_char uart_input = 'A'; // Initial value of A
u_char uart_output; // To store received character
u_char uart_input = 'A';
u_char uart_output;
while (true) {
uart_transmit(&uart_input); // Pass by reference to change
// value of uart_input during transmission
while (1) {
uart_transmit(&uart_input);
uart_receive(&uart_output); // Pass by reference to change
// value of uart_output during reception
uart_receive(&uart_output);
sleep_ms(SLEEP_TIME); // Sleep based on SLEEP_TIME
sleep_ms(SLEEP_TIME);
}
}