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Replace UART with that from amaranth-soc RFC #50

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Merged
merged 1 commit into from
Mar 18, 2025
Merged

Replace UART with that from amaranth-soc RFC #50

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13 changes: 11 additions & 2 deletions chipflow_lib/software/drivers/uart.c
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Original file line number Diff line number Diff line change
@@ -1,12 +1,21 @@
/* SPDX-License-Identifier: BSD-2-Clause */
#include "uart.h"

void uart_init(volatile uart_regs_t *uart, uint32_t divisor) {
uart->tx.config = 0;
uart->tx.phy_config = divisor & 0x00FFFFFF;
uart->tx.config = 1;
uart->rx.config = 0;
uart->rx.phy_config = divisor & 0x00FFFFFF;
uart->rx.config = 1;
};

void uart_putc(volatile uart_regs_t *uart, char c) {
if (c == '\n')
uart_putc(uart, '\r');
while (!uart->tx_ready)
while (!(uart->tx.status & 0x1))
;
uart->tx_data = c;
uart->tx.data = c;
}

void uart_puts(volatile uart_regs_t *uart, const char *s) {
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16 changes: 12 additions & 4 deletions chipflow_lib/software/drivers/uart.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5,12 +5,20 @@
#include <stdint.h>

typedef struct __attribute__((packed, aligned(4))) {
uint32_t tx_data;
uint32_t rx_data;
uint32_t tx_ready;
uint32_t rx_avail;
uint8_t config;
uint8_t padding_0[3];
uint32_t phy_config;
uint8_t status;
uint8_t data;
uint8_t padding_1[6];
} uart_mod_regs_t;

typedef struct __attribute__((packed, aligned(4))) {
uart_mod_regs_t rx;
uart_mod_regs_t tx;
} uart_regs_t;

void uart_init(volatile uart_regs_t *uart, uint32_t divisor);
void uart_putc(volatile uart_regs_t *uart, char c);
void uart_puts(volatile uart_regs_t *uart, const char *s);
void uart_puthex(volatile uart_regs_t *uart, uint32_t x);
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