37 lines
1 KiB
C
37 lines
1 KiB
C
/* Serial terminal example
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* UART RX is interrupt driven
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* Read characters until \n and echo back
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*
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* This sample code is in the public domain.
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*/
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#include <stdint.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <espressif/esp_common.h>
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#include <serial_driver.h>
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#define BUFFER_SIZE (81)
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void user_init(void)
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{
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char buffer[BUFFER_SIZE];
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uint32_t i = 0;
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sdk_uart_div_modify(0, UART_CLK_FREQ / 115200);
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while(1) {
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char ch;
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// The thread will block here until there is data available
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// NB. read(...) may be called from user_init or from a thread
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// We can check how many characters are available in the RX buffer
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// with uint32_t uart0_num_char(void);
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if (read(0, (void*)&ch, 1)) { // 0 is stdin
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if (i == BUFFER_SIZE-2 || ch == '\n') {
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buffer[i] = 0;
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printf("Unknown command: %s\n", (char*) buffer);
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i = 0;
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} else {
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buffer[i++] = ch;
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}
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}
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}
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}
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