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rp2040: Add initial adc support

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2021-06-22 21:10:12 -04:00
parent 045bfa4e8d
commit 59fe878241
6 changed files with 109 additions and 2 deletions
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8
src/rp2040/main.c
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@@ -42,6 +42,7 @@ DECL_INIT(watchdog_init);
#define FREQ_XOSC 12000000
#define FREQ_SYS 125000000
#define FREQ_USB 48000000
void
enable_pclock(uint32_t reset_bit)
@@ -126,8 +127,13 @@ clock_setup(void)
while (!(csys->selected & (1 << 1)))
;
// Setup clk_peri
// Setup pll_usb
enable_pclock(RESETS_RESET_PLL_USB_BITS);
pll_setup(pll_usb_hw, 40, 40*FREQ_XOSC/FREQ_USB);
// Setup clk_peri and clk_adc
clk_aux_setup(clk_peri, CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLK_SYS);
clk_aux_setup(clk_adc, CLOCKS_CLK_ADC_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB);
// Enable watchdog tick (at 12Mhz)
cref->div = 1<<CLOCKS_CLK_REF_DIV_INT_LSB;