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SAMA5 PWM: PWM driver is now functional

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This commit is contained in:
Gregory Nutt 2013-11-07 09:17:46 -06:00
parent f9adc35bda
commit 90a2679031
2 changed files with 128 additions and 71 deletions
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79
configs/sama5d3x-ek/README.txt
View File

@ -852,36 +852,40 @@ SAMA5 PWM Support
Where x=0..3.
Care must be taken because all PWM output pins conflict with some other
usage of the pin by other devices:
usage of the pin by other devices. Furthermore, many of these pins have
not been brought out to an external connector:
-----+---+---+----+------+----------------
PWM PIN PER PIO I/O CONFLICTS
-----+---+---+----+------+----------------
PWM0 FI B PC28 J2.30 SPI1, ISI
H B PB0 --- GMAC
B PA20 J1.14 LCDC, ISI
L B PB1 --- GMAC
B PA21 J1.16 LCDC, ISI
-----+---+---+----+------+----------------
PWM1 FI B PC31 J2.36 HDMI
H B PB4 --- GMAC
B PA22 J1.18 LCDC, ISI
L B PB5 --- GMAC
B PE31 J3.20 ISI, HDMI
B PA23 J1.20 LCDC, ISI
-----+---+---+----+------+----------------
PWM2 FI B PC29 J2.29 UART0, ISI, HDMI
H C PD5 --- HSMCI0
B PB8 --- GMAC
L C PD6 --- HSMCI0
B PB9 --- GMAC
-----+---+---+----+------+----------------
PWM3 FI C PD16 --- SPI0, Audio
H C PD7 --- HSMCI0
B PB12 J3.7 GMAC
L C PD8 --- HSMCI0
B PB13 --- GMAC
-----+---+---+----+--------------------
PWM PIN PER PIO CONFLICTS
-----+---+---+----+--------------------
PWM0 FI B PC28 SPI1, ISI
H B PB0 GMAC
B PA20 LCDC, ISI
L B PB1 GMAC
B PA21 LCDC, ISI
-----+---+---+----+--------------------
PWM1 FI B PC31 HDMI
H B PB4 GMAC
B PA22 LCDC, ISI
L B PB5 GMAC
B PE31 ISI, HDMI
B PA23 LCDC, ISI
-----+---+---+----+--------------------
PWM2 FI B PC29 UART0, ISI, HDMI
H C PD5 HSMCI0
B PB8 GMAC
L C PD6 HSMCI0
B PB9 GMAC
-----+---+---+----+--------------------
PWM3 FI C PD16 SPI0, Audio
H C PD7 HSMCI0
B PB12 GMAC
L C PD8 HSMCI0
B PB13 GMAC
-----+---+---+----+--------------------
See configs/sama5d3x-ek/include/board.h for all of the default PWM
pin selections. I used PWM channel 0, pins PA20 and PA21 for testing.
Clocking is addressed in the next paragraph.
@ -889,7 +893,7 @@ SAMA5 PWM Support
-----------------------
PWM Channels can be clocked from either a coarsely divided divided down
MCK or from a custom frequency from PWM CLKA and/or CLKB. If you want
to use CLKA or CLKB, you must enable and configuratino them.
to use CLKA or CLKB, you must enable and configure them.
System Type -> PWM Configuration
CONFIG_SAMA5_PWM_CLKA=y
@ -901,7 +905,7 @@ SAMA5 PWM Support
for that channel:
System Type -> PWM Configuration
CONFIG_SAMA5_PWM_CHANx_CLKA=y : Pick one of MCK, CLKA, or CLKB
CONFIG_SAMA5_PWM_CHANx_CLKA=y : Pick one of MCK, CLKA, or CLKB (only)
CONFIG_SAMA5_PWM_CHANx_CLKB=y
CONFIG_SAMA5_PWM_CHANx_MCK=y
CONFIG_SAMA5_PWM_CHANx_MCKDIV=128 : If MCK is selected, then the MCK divider must
@ -921,6 +925,21 @@ SAMA5 PWM Support
CONFIG_EXAMPLES_PWM_DEVPATH="/dev/pwm0"
CONFIG_EXAMPLES_PWM_FREQUENCY=100
Usage of the example is straightforward:
nsh> pwm -h
Usage: pwm [OPTIONS]
Arguments are "sticky". For example, once the PWM frequency is
specified, that frequency will be re-used until it is changed.
"sticky" OPTIONS include:
[-p devpath] selects the PWM device. Default: /dev/pwm0 Current: /dev/pwm0
[-f frequency] selects the pulse frequency. Default: 100 Hz Current: 100 Hz
[-d duty] selects the pulse duty as a percentage. Default: 50 % Current: 50 %
[-t duration] is the duration of the pulse train in seconds. Default: 5 Current: 5
[-h] shows this message and exits
OV2640 Camera interface
=======================

120
configs/sama5d3x-ek/include/board.h
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@ -178,56 +178,88 @@
/* PWM. There are no dedicated PWM output pins available to the user for PWM
* testing. Care must be taken because all PWM output pins conflict with some other
* usage of the pin by other devices:
* usage of the pin by other devices. Furthermore, many of these pins have not been
* brought out to an external connector:
*
* -----+---+---+----+--------------------
* PWM PIN PER PIO CONFLICTS
* -----+---+---+----+--------------------
* PWM0 FI B PC28 SPI1, ISI
* H B PB0 GMAC
* B PA20 LCDC, ISI
* L B PB1 GMAC
* B PA21 LCDC, ISI
* -----+---+---+----+--------------------
* PWM1 FI B PC31 HDMI
* H B PB4 GMAC
* B PA22 LCDC, ISI
* L B PB5 GMAC
* B PE31 ISI, HDMI
* B PA23 LCDC, ISI
* -----+---+---+----+--------------------
* PWM2 FI B PC29 UART0, ISI, HDMI
* H C PD5 HSMCI0
* B PB8 GMAC
* L C PD6 HSMCI0
* B PB9 GMAC
* -----+---+---+----+--------------------
* PWM3 FI C PD16 SPI0, Audio
* H C PD7 HSMCI0
* B PB12 GMAC
* L C PD8 HSMCI0
* B PB13 GMAC
* -----+---+---+----+--------------------
* -----+---+---+----+------+----------------
* PWM PIN PER PIO I/O CONFLICTS
* -----+---+---+----+------+----------------
* PWM0 FI B PC28 J2.30 SPI1, ISI
* H B PB0 --- GMAC
* B PA20 J1.14 LCDC, ISI
* L B PB1 --- GMAC
* B PA21 J1.16 LCDC, ISI
* -----+---+---+----+------+----------------
* PWM1 FI B PC31 J2.36 HDMI
* H B PB4 --- GMAC
* B PA22 J1.18 LCDC, ISI
* L B PB5 --- GMAC
* B PE31 J3.20 ISI, HDMI
* B PA23 J1.20 LCDC, ISI
* -----+---+---+----+------+----------------
* PWM2 FI B PC29 J2.29 UART0, ISI, HDMI
* H C PD5 --- HSMCI0
* B PB8 --- GMAC
* L C PD6 --- HSMCI0
* B PB9 --- GMAC
* -----+---+---+----+------+----------------
* PWM3 FI C PD16 --- SPI0, Audio
* H C PD7 --- HSMCI0
* B PB12 J3.7 GMAC
* L C PD8 --- HSMCI0
* B PB13 --- GMAC
* -----+---+---+----+------+----------------
*/
#if !defined(CONFIG_SAMA5_GMAC)
/* PWM channel 0:
*
* PA20 and PA21 can be used if the LCDC or ISI are not selected. These outputs are
* available on J1, pins 14 and 16, respectively.
*
* If the GMAC is not selected, then PB0 and PB1 could also be used. However,
* these pins are not available at the I/O expansion connectors.
*/
#if !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM0_H PIO_PWM0_H_2
# define PIO_PWM0_L PIO_PWM0_L_2
#elif !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM0_H PIO_PWM0_H_1
# define PIO_PWM0_L PIO_PWM0_L_1
#elif !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM0_H PIO_PWM0_H_2
# define PIO_PWM0_L PIO_PWM0_L_3
#endif
#if !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM1_H PIO_PWM1_H_1
# define PIO_PWM1_L PIO_PWM1_L_1
#elif !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
/* PWM channel 1:
*
* PA22 and PA23 can be used if the LCDC or ISI are not selected. These outputs are
* available on J1, pins 18 and 20, respectively.
*
* PE31 can be used if the ISI is not selected (and the HDMI is not being used).
* That signal is available at J3 pin 20.
*
* If the GMAC is not selected, then PB4 and PB5 could also be used. However,
* these pins are not available at the I/O expansion connectors.
*/
#if !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM1_H PIO_PWM1_H_2
#elif !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM1_H PIO_PWM1_H_1
#endif
#if !defined(CONFIG_SAMA5_LCDC) && !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM1_L PIO_PWM1_L_3
#elif !defined(CONFIG_SAMA5_ISI)
# define PIO_PWM1_L PIO_PWM1_L_2
#elif !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM1_L PIO_PWM1_L_1
#endif
/* PWM channel 2:
*
* None of the output pin options are available at any of the I/O expansion
* connectors for PWM channel 2
*/
#if !defined(CONFIG_SAMA5_HSMCI0)
# define PIO_PWM2_H PIO_PWM2_H_1
# define PIO_PWM2_L PIO_PWM2_L_1
@ -236,12 +268,18 @@
# define PIO_PWM2_L PIO_PWM2_L_2
#endif
#if !defined(CONFIG_SAMA5_HSMCI0)
# define PIO_PWM3_H PIO_PWM3_H_1
# define PIO_PWM3_L PIO_PWM3_L_1
#elif !defined(CONFIG_SAMA5_GMAC)
/* PWM channel 3:
*
* If the GMAC is not selected, then PB12 can used and is available at J3 pin 7.
* None of the other output pins are accessible at the I/O expansion connectors.
*/
#if !defined(CONFIG_SAMA5_GMAC)
# define PIO_PWM3_H PIO_PWM3_H_2
# define PIO_PWM3_L PIO_PWM3_L_2
#elif !defined(CONFIG_SAMA5_HSMCI0)
# define PIO_PWM3_H PIO_PWM3_H_1
# define PIO_PWM3_L PIO_PWM3_L_1
#endif
/************************************************************************************