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serial_putc() to make better use of Tx FIFO #58

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serial_putc() to make better use of Tx FIFO #58

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1 change: 1 addition & 0 deletions libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC176X/objects.h
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@ struct pwmout_s {
struct serial_s {
LPC_UART_TypeDef *uart;
int index;
uint8_t count;
};

struct analogin_s {
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10 changes: 9 additions & 1 deletion libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC176X/serial_api.c
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Expand Up @@ -106,6 +106,7 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
case UART_2: obj->index = 2; break;
case UART_3: obj->index = 3; break;
}
obj->count = 0;

is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);

Expand Down Expand Up @@ -283,6 +284,7 @@ int serial_getc(serial_t *obj) {
void serial_putc(serial_t *obj, int c) {
while (!serial_writable(obj));
obj->uart->THR = c;
obj->count++;

uint32_t lsr = obj->uart->LSR;
lsr = lsr;
Expand All @@ -295,7 +297,13 @@ int serial_readable(serial_t *obj) {
}

int serial_writable(serial_t *obj) {
return obj->uart->LSR & 0x20;
int isWritable = 1;
if (obj->uart->LSR & 0x20)
obj->count = 0;
else if (obj->count >= 16)
isWritable = 0;

return isWritable;
}

void serial_clear(serial_t *obj) {
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