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avr: Add initial support for atmega32u4 chips

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Signed-off-by: Trevor Jones <trevorjones141@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2018-11-19 21:42:14 -05:00
parent 31687bc009
commit 2cc0313b72
4 changed files with 33 additions and 12 deletions
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18
src/avr/usbserial.c
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@@ -178,18 +178,26 @@ usb_set_configure(void)
UEIENX = 1<<TXINE;
}
#if CONFIG_MACH_at90usb1286
#define UHWCON_Init ((1<<UIMOD) | (1<<UVREGE))
#define PLLCSR_Init ((1<<PLLP2) | (1<<PLLP0) | (1<<PLLE))
#elif CONFIG_MACH_at90usb646
#define UHWCON_Init ((1<<UIMOD) | (1<<UVREGE))
#define PLLCSR_Init ((1<<PLLP2) | (1<<PLLP1) | (1<<PLLE))
#elif CONFIG_MACH_atmega32u4
#define UHWCON_Init (1<<UVREGE)
#define PLLCSR_Init ((1<<PINDIV) | (1<<PLLE))
#endif
void
usbserial_init(void)
{
// Set USB controller to device mode
UHWCON = (1<<UIMOD) | (1<<UVREGE);
UHWCON = UHWCON_Init;
// Enable USB clock
USBCON = (1<<USBE) | (1<<FRZCLK);
if (CONFIG_MACH_at90usb1286)
PLLCSR = (1<<PLLP2) | (1<<PLLP0) | (1<<PLLE);
else
PLLCSR = (1<<PLLP2) | (1<<PLLP1) | (1<<PLLE);
PLLCSR = PLLCSR_Init;
while (!(PLLCSR & (1<<PLOCK)))
;
USBCON = (1<<USBE) | (1<<OTGPADE);