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// Prototypes
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// Prototypes
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void scan_twi(void);
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void scan_twi(void);
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void set_speed(void);
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void set_speed(void);
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void send_twi(void);
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void send_twi(void);
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uint32_t hexstr_to_uint(char *buffer, uint8_t length);
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uint32_t hexstr_to_uint(char *buffer, uint8_t length);
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void print_hex_byte(uint8_t data);
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/**********************************************************************//**
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/**********************************************************************//**
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* This program provides an interactive console to communicate with TWI devices.
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* This program provides an interactive console to communicate with TWI devices.
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*
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*
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// info
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// info
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neorv32_uart0_printf("This program allows to create TWI transfers by hand.\n"
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neorv32_uart0_printf("This program allows to create TWI transfers by hand.\n"
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"Type 'help' to see the help menu.\n\n");
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"Type 'help' to see the help menu.\n\n");
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// configure TWI, second slowest clock, no clock-stretching
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// configure TWI, second slowest clock
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neorv32_twi_setup(CLK_PRSC_2048, 0);
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neorv32_twi_setup(CLK_PRSC_2048);
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// no active bus session yet
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// no active bus session yet
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bus_claimed = 0;
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bus_claimed = 0;
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// Main menu
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// Main menu
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for (i=0; i<128; i++) {
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for (i=0; i<128; i++) {
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uint8_t twi_ack = neorv32_twi_start_trans((uint8_t)(2*i+1));
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uint8_t twi_ack = neorv32_twi_start_trans((uint8_t)(2*i+1));
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neorv32_twi_generate_stop();
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neorv32_twi_generate_stop();
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if (twi_ack == 0) {
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if (twi_ack == 0) {
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neorv32_uart0_printf("+ Found device at write-address 0x%x\n", (uint32_t)(2*i));
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neorv32_uart0_printf(" + Found device at write-address 0x");
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print_hex_byte(2*i);
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neorv32_uart0_printf("\n");
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num_devices++;
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num_devices++;
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}
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}
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}
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}
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if (!num_devices) {
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if (!num_devices) {
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// enter data
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// enter data
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neorv32_uart0_printf("Enter TX data (2 hex chars): ");
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neorv32_uart0_printf("Enter TX data (2 hex chars): ");
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neorv32_uart0_scan(terminal_buffer, 3, 1); // 2 hex chars for address plus '\0'
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neorv32_uart0_scan(terminal_buffer, 3, 1); // 2 hex chars for address plus '\0'
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uint8_t tmp = (uint8_t)hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
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uint8_t tmp = (uint8_t)hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
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uint8_t res = neorv32_twi_trans(tmp);
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uint8_t res = neorv32_twi_trans(tmp);
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neorv32_uart0_printf("\nRX data: 0x%x\n", (uint32_t)neorv32_twi_get_data());
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neorv32_uart0_printf("\n RX data: 0x");
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neorv32_uart0_printf("Response: ");
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print_hex_byte((uint8_t)neorv32_twi_get_data());
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neorv32_uart0_printf("\n Response: ");
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if (res == 0)
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if (res == 0)
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neorv32_uart0_printf("ACK\n");
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neorv32_uart0_printf("ACK\n");
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else
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else
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neorv32_uart0_printf("NACK\n");
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neorv32_uart0_printf("NACK\n");
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}
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}
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/**********************************************************************//**
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/**********************************************************************//**
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* Helper function to convert N hex chars string into uint32_T
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* Helper function to convert N hex chars string into uint32_t
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*
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*
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* @param[in,out] buffer Pointer to array of chars to convert into number.
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* @param[in,out] buffer Pointer to array of chars to convert into number.
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* @param[in,out] length Length of the conversion string.
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* @param[in,out] length Length of the conversion string.
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* @return Converted number.
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* @return Converted number.
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**************************************************************************/
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**************************************************************************/
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res = res + (d << (length*4));
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res = res + (d << (length*4));
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}
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}
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return res;
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return res;
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}
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}
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/**********************************************************************//**
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* Print byte as hex chars via UART0.
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*
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* @param data 8-bit data to be printed as two hex chars.
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**************************************************************************/
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void print_hex_byte(uint8_t data) {
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static const char symbols[] = "0123456789abcdef";
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neorv32_uart0_putc(symbols[(data >> 4) & 15]);
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neorv32_uart0_putc(symbols[(data >> 0) & 15]);
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}
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