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Changed formatting and added new UART divsor calculation from OpenSBI.

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This commit is contained in:
Jacob Pease 2024-07-25 13:04:27 -05:00
parent 336a413f31
commit a36e846b02
1 changed files with 45 additions and 46 deletions
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13
fpga/zsbl/uart.c
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@ -31,7 +31,9 @@ void write_serial(char a)
void init_uart(uint32_t freq, uint32_t baud) void init_uart(uint32_t freq, uint32_t baud)
{ {
uint32_t divisor = freq / (baud << 4); // Alternative divisor calculation. From OpenSBI code.
// Reduces error for every possible frequency.
uint32_t divisor = (freq + 8 * baud) /(baud << 4);
write_reg_u8(UART_IER, 0x00); // Disable all interrupts write_reg_u8(UART_IER, 0x00); // Disable all interrupts
write_reg_u8(UART_LCR, 0x80); // Enable DLAB (set baud rate divisor) write_reg_u8(UART_LCR, 0x80); // Enable DLAB (set baud rate divisor)
@ -44,8 +46,7 @@ void init_uart(uint32_t freq, uint32_t baud)
void print_uart(const char *str) void print_uart(const char *str)
{ {
const char *cur = &str[0]; const char *cur = &str[0];
while (*cur != '\0') while (*cur != '\0') {
{
write_serial((uint8_t)*cur); write_serial((uint8_t)*cur);
++cur; ++cur;
} }
@ -64,8 +65,7 @@ void bin_to_hex(uint8_t inp, uint8_t res[2])
void print_uart_int(uint32_t addr) void print_uart_int(uint32_t addr)
{ {
int i; int i;
for (i = 3; i > -1; i--) for (i = 3; i > -1; i--) {
{
uint8_t cur = (addr >> (i * 8)) & 0xff; uint8_t cur = (addr >> (i * 8)) & 0xff;
uint8_t hex[2]; uint8_t hex[2];
bin_to_hex(cur, hex); bin_to_hex(cur, hex);
@ -77,8 +77,7 @@ void print_uart_int(uint32_t addr)
void print_uart_addr(uint64_t addr) void print_uart_addr(uint64_t addr)
{ {
int i; int i;
for (i = 7; i > -1; i--) for (i = 7; i > -1; i--) {
{
uint8_t cur = (addr >> (i * 8)) & 0xff; uint8_t cur = (addr >> (i * 8)) & 0xff;
uint8_t hex[2]; uint8_t hex[2];
bin_to_hex(cur, hex); bin_to_hex(cur, hex);