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Improved ADI UART driver model 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@13532 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
This commit is contained in:
Rocco Marco Guglielmi 2020-04-14 06:36:45 +00:00
parent ccba34de01
commit 38c41e9799
2 changed files with 39 additions and 0 deletions
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2
os/hal/ports/ADUCM/ADUCM36x/aducm_registry.h
View File

@ -50,6 +50,8 @@
#define ADUCM_HAS_UART0 TRUE
#define ADUCM_HAS_UART1 FALSE
#define ADUCM_UART_STEPPING 0
#else
#error "ADUCM36x device not specified"
#endif

37
os/hal/ports/ADUCM/LLD/UARTv1/hal_serial_lld.c
View File

@ -90,6 +90,7 @@ static void uart_init(SerialDriver *sdp, const SerialConfig *config) {
/* Resetting the UART state machine. */
sdp->uart->CTL = ADUCM_UART_CTL_DISABLE;
#if (ADUCM_UART_STEPPING == 0)
/* Baud rate setting.*/
osalDbgAssert(((sdp->clock / 32U) > config->speed),
"invalid baud rate vs input clock");
@ -124,7 +125,43 @@ static void uart_init(SerialDriver *sdp, const SerialConfig *config) {
comdiv) - (divm * 2048U));
osalDbgAssert((divn <= 2047), "invalid divn value");
#elif (ADUCM_UART_STEPPING == 1)
sdp->uart->LCR2 = 3;
/* Baud rate setting.*/
osalDbgAssert(((sdp->clock / 32U) > config->speed),
"invalid baud rate vs input clock");
/* The Baudrate comes from the formula:
BR = (UDIV/DIV) / (32 * comdiv) / (M + N/2048)
Whereas:
- 0 < comdiv < 65536
- 0 <= M < 4
- 0 <= N < 2048
The following computation is deduced from the fact the the maximum value
of M is 3 and that N/2048 is always smaller than 1.
Thus, is it possible to find M and comdiv in an interative way increasing
comdiv until M does not reaches an allowed value.
Once founded comdiv and M it is possible to find N inverting the equation.
Note that N only refines the value introducing a decimal part to the last
dividend.
*/
comdiv = 1U;
divm = sdp->clock / config->speed / 32U / comdiv;
while(divm > 3U) {
comdiv++;
divm = sdp->clock / config->speed / 32U / comdiv;
}
osalDbgAssert((divm <= 3), "invalid divm value");
osalDbgAssert((comdiv <= 65535U) && (comdiv >= 1), "invalid comdiv value");
divn = (uint32_t)((((uint64_t)sdp->clock * 2048U) / config->speed / 32U /
comdiv) - (divm * 2048U));
osalDbgAssert((divn <= 2047), "invalid divn value");
#endif
sdp->uart->FBR = ADUCM_UART_FBR_ENABLE | ADUCM_UART_FBR_DIVM(divm) |
ADUCM_UART_FBR_DIVN(divn);