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URL https://opencores.org/ocsvn/neorv32/neorv32/trunk

Subversion Repositories neorv32

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  • This comparison shows the changes necessary to convert path 
    /neorv32/trunk/sw/example/demo_spi
    from Rev 68 to Rev 69
    ↔ Reverse comparison
  •

Rev 68 → Rev 69

/main.c
60,11 → 60,24
void spi_cs(uint32_t type);
void spi_trans(void);
void spi_setup(void);
void flash_write(void);
void flash_read(void);
uint32_t hexstr_to_uint(char *buffer, uint8_t length);
void aux_print_hex_byte(uint8_t byte);
 
 
/**********************************************************************//**
* SPI flash commands
**************************************************************************/
enum SPI_FLASH_CMD {
SPI_FLASH_CMD_WRITE = 0x02, /**< Write data */
SPI_FLASH_CMD_READ = 0x03, /**< Read data */
SPI_FLASH_CMD_READ_SR = 0x05, /**< Get status register */
SPI_FLASH_CMD_WREN = 0x06 /**< Enable write access */
};
 
 
/**********************************************************************//**
* This program provides an interactive console to communicate with SPI devices.
*
* @note This program requires the UART and the SPI to be synthesized.
73,7 → 86,7
**************************************************************************/
int main() {
 
char buffer[8];
char buffer[16];
int length = 0;
 
 
99,7 → 112,6
return 1;
}
 
 
// info
neorv32_uart0_printf("This program allows to create SPI transfers by hand.\n"
"Type 'help' to see the help menu.\n\n");
113,7 → 125,7
// Main menu
for (;;) {
neorv32_uart0_printf("SPI_EXPLORER:> ");
length = neorv32_uart0_scan(buffer, 8, 1);
length = neorv32_uart0_scan(buffer, 15, 1);
neorv32_uart0_printf("\n");
 
if (!length) // nothing to be done
122,14 → 134,20
// decode input and execute command
if (!strcmp(buffer, "help")) {
neorv32_uart0_printf("Available commands:\n"
" help - show this text\n"
" setup - configure SPI module\n"
" cs-en - enable CS line (set low)\n"
" cs-dis - disable CS line (set high)\n"
" trans - execute a transmission (write & read to/from SPI)\n"
" help - show this text\n"
" setup - configure SPI module (clock speed and mode, data size)\n"
" cs-en - enable CS line (set low)\n"
" cs-dis - disable CS line (set high)\n"
" trans - execute a transmission (write & read to/from SPI)\n"
"\n"
" flash-wr - write binary file to SPI flash\n"
" flash-rd - dump SPI flash\n"
"\n"
"Configure the SPI module using 'setup'. Enable a certain module using 'cs-en',\n"
"then transfer data using 'trans' and disable the module again using 'cs-dis'.\n\n");
"then transfer data using 'trans' and disable the module again using 'cs-dis'.\n"
"\n"
"Standard SPI flash and EEPROM memories can be programmed/read\n"
"via 'flash-wr' and 'flash-rd'.\n\n");
}
else if (!strcmp(buffer, "setup")) {
spi_setup();
143,6 → 161,12
else if (!strcmp(buffer, "trans")) {
spi_trans();
}
else if (!strcmp(buffer, "flash-wr")) {
flash_write();
}
else if (!strcmp(buffer, "flash-rd")) {
flash_read();
}
else {
neorv32_uart0_printf("Invalid command. Type 'help' to see all commands.\n");
}
203,7 → 227,7
return;
}
 
neorv32_uart0_printf("Enter TX data (%u hex chars): 0x", spi_size);
neorv32_uart0_printf("Enter TX data (%u hex chars): 0x", spi_size*2);
neorv32_uart0_scan(terminal_buffer, spi_size*2+1, 1);
uint32_t tx_data = (uint32_t)hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
 
322,6 → 346,214
 
 
/**********************************************************************//**
* Read (dump) flash
**************************************************************************/
void flash_read(void) {
 
char terminal_buffer[9];
uint32_t tmp, addr, channel, num_addr_bytes;
 
if (spi_configured == 0) {
neorv32_uart0_printf("SPI module not configured yet! Use 'setup' to configure SPI module.\n");
return;
}
 
// configure 8-bit SPI mode
tmp = NEORV32_SPI.CTRL;
tmp &= ~(0x03 << SPI_CTRL_SIZE0);
NEORV32_SPI.CTRL = tmp;
neorv32_uart0_printf("Warning! SPI size configuration has been overridden!\n");
 
// how many address bytes?
while (1) {
neorv32_uart0_printf("Enter number of address bytes (2,3): ");
neorv32_uart0_scan(terminal_buffer, 2, 1); // 1 hex char plus '\0'
num_addr_bytes = hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
if ((num_addr_bytes < 2) || (num_addr_bytes > 3)) {
neorv32_uart0_printf("\nInvalid channel selection!\n");
continue;
}
else {
break;
}
}
 
// chip-select
while (1) {
neorv32_uart0_printf("\nSelect flash chip-select line [0..7]: ");
neorv32_uart0_scan(terminal_buffer, 2, 1); // 1 hex char plus '\0'
channel = hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
if (channel > 7) {
neorv32_uart0_printf("\nInvalid channel selection!\n");
continue;
}
else {
break;
}
}
 
// base address
neorv32_uart0_printf("\nEnter base address (8 hex chars): 0x");
neorv32_uart0_scan(terminal_buffer, 9, 1);
addr = (uint32_t)hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
 
neorv32_uart0_printf("\nPress any key to start. Press any key to stop reading.\n");
while(neorv32_uart0_char_received() == 0);
 
while(1) {
if (neorv32_uart0_char_received()) { // abort when key pressed
break;
}
 
if ((addr & 0x1f) == 0) {
neorv32_uart0_printf("\n%x: ", addr);
}
 
// read byte
neorv32_spi_cs_en((uint8_t)channel);
neorv32_spi_trans(SPI_FLASH_CMD_READ);
if (num_addr_bytes == 3) {
neorv32_spi_trans(addr >> 16);
}
neorv32_spi_trans(addr >> 8);
neorv32_spi_trans(addr >> 0);
tmp = neorv32_spi_trans(0);
neorv32_spi_cs_dis((uint8_t)channel);
 
aux_print_hex_byte((uint8_t)tmp);
neorv32_uart0_putc(' ');
 
addr++;
}
 
neorv32_uart0_printf("\n");
spi_configured = 0;
}
 
 
/**********************************************************************//**
* Write flash
**************************************************************************/
void flash_write(void) {
 
neorv32_uart0_printf("work-in-progress\n");
return;
 
char terminal_buffer[9], rx_data;
uint32_t tmp, addr, channel, num_data_bytes, num_addr_bytes;
int res;
 
if (spi_configured == 0) {
neorv32_uart0_printf("SPI module not configured yet! Use 'setup' to configure SPI module.\n");
return;
}
 
// configure 8-bit SPI mode
tmp = NEORV32_SPI.CTRL;
tmp &= ~(0x03 << SPI_CTRL_SIZE0);
NEORV32_SPI.CTRL = tmp;
neorv32_uart0_printf("Warning! SPI size configuration has been overridden!\n");
 
// how many address bytes?
while (1) {
neorv32_uart0_printf("Enter number of address bytes (2,3): ");
neorv32_uart0_scan(terminal_buffer, 2, 1); // 1 hex char plus '\0'
num_addr_bytes = hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
if ((num_addr_bytes < 2) || (num_addr_bytes > 3)) {
neorv32_uart0_printf("\nInvalid channel selection!\n");
continue;
}
else {
break;
}
}
 
// how many bytes?
neorv32_uart0_printf("\nEnter total number of bytes to write (%u hex chars): ", num_addr_bytes*2);
neorv32_uart0_scan(terminal_buffer, num_addr_bytes*2+1, 1); // 1 hex char plus '\0'
num_data_bytes = hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
 
// chip-select
while (1) {
neorv32_uart0_printf("\nSelect flash chip-select line [0..7]: ");
neorv32_uart0_scan(terminal_buffer, 2, 1); // 1 hex char plus '\0'
channel = hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
if (channel > 7) {
neorv32_uart0_printf("\nInvalid channel selection!\n");
continue;
}
else {
break;
}
}
 
// base address
neorv32_uart0_printf("\nEnter base address (8 hex chars): 0x");
neorv32_uart0_scan(terminal_buffer, 9, 1);
addr = (uint32_t)hexstr_to_uint(terminal_buffer, strlen(terminal_buffer));
 
// start!
neorv32_uart0_printf("\nSend raw data via UART (%u bytes)...\n", num_data_bytes);
while (neorv32_uart0_tx_busy());
 
// clear UART0 FIFOs
neorv32_uart0_disable();
neorv32_uart0_enable();
 
while (num_data_bytes) {
 
// write enable
neorv32_spi_cs_en((uint8_t)channel);
neorv32_spi_trans(SPI_FLASH_CMD_WREN);
neorv32_spi_cs_dis((uint8_t)channel);
 
// get new UART data
while(1) {
res = neorv32_uart0_getc_safe(&rx_data);
if (res == -1) {
continue;
}
if (res == 0) {
break;
}
else {
neorv32_uart0_printf("UART transmission error (%i)!\n", res);
return;
}
}
 
// write byte
neorv32_spi_cs_en((uint8_t)channel);
neorv32_spi_trans(SPI_FLASH_CMD_WRITE);
if (num_addr_bytes == 3) {
neorv32_spi_trans(addr >> 16);
}
neorv32_spi_trans(addr >> 8);
neorv32_spi_trans(addr >> 0);
neorv32_spi_trans((uint32_t)rx_data);
neorv32_spi_cs_dis((uint8_t)channel);
 
// check status register
while (1) {
neorv32_spi_cs_en((uint8_t)channel);
neorv32_spi_trans(SPI_FLASH_CMD_READ_SR);
tmp = neorv32_spi_trans(0);
neorv32_spi_cs_dis((uint8_t)channel);
if ((tmp & 0x01) == 0) { // write-in-progress flag cleared?
break;
}
}
 
addr++;
num_data_bytes--;
}
 
neorv32_uart0_printf("\n");
spi_configured = 0;
}
 
 
/**********************************************************************//**
* Helper function to convert N hex chars string into uint32_T
*
* @param[in,out] buffer Pointer to array of chars to convert into number.

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