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Improve UART power-cycling logic:

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* Only enable TX by default.
* Add some magic for RX handling. When an input handler is registered:
  * Automatically enable RX-related and interrupts
  * Automatically lock the SERIAL PD on under all power modes
  * Automatically enable the UART clock under sleep and deep sleep
  * Automatically undo all of the above when the input handler becomes NULL
  * As a result, modules / examples that need UART RX no longer need to clock the UART and manipulate the SERIAL PD. They simply have to specify an input handler
* Don't automatically power on the UART whenever the CM3 is active
* Before accessing the UART, make sure it is powered and clocked
* Avoid falling edge glitches
* Fix garbage characters / Explicitly wait for UART TX to complete
This commit is contained in:
George Oikonomou 2015-05-01 17:03:26 +01:00
parent 34f52ed08e
commit 07272b7cd6
3 changed files with 271 additions and 95 deletions
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21
cpu/cc26xx/putchar.c
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@ -29,6 +29,7 @@
*/
/*---------------------------------------------------------------------------*/
#include "cc26xx-uart.h"
#include "ti-lib.h"
#include <string.h>
/*---------------------------------------------------------------------------*/
@ -47,9 +48,16 @@ puts(const char *str)
return 0;
}
for(i = 0; i < strlen(str); i++) {
putchar(str[i]);
cc26xx_uart_write_byte(str[i]);
}
putchar('\n');
cc26xx_uart_write_byte('\n');
/*
* Wait for the line to go out. This is to prevent garbage when used between
* UART on/off cycles
*/
while(cc26xx_uart_busy() == UART_BUSY);
return i;
}
/*---------------------------------------------------------------------------*/
@ -62,9 +70,16 @@ dbg_send_bytes(const unsigned char *s, unsigned int len)
if(i >= len) {
break;
}
putchar(*s++);
cc26xx_uart_write_byte(*s++);
i++;
}
/*
* Wait for the buffer to go out. This is to prevent garbage when used
* between UART on/off cycles
*/
while(cc26xx_uart_busy() == UART_BUSY);
return i;
}
/*---------------------------------------------------------------------------*/