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-rw-r--r--examples/lpc43xx/hackrf-jellybean/ssp/Makefile24
-rw-r--r--examples/lpc43xx/hackrf-jellybean/ssp/README48
-rw-r--r--examples/lpc43xx/hackrf-jellybean/ssp/sspdemo.c102
3 files changed, 174 insertions, 0 deletions
diff --git a/examples/lpc43xx/hackrf-jellybean/ssp/Makefile b/examples/lpc43xx/hackrf-jellybean/ssp/Makefile
new file mode 100644
index 0000000..8a3b1cc
--- /dev/null
+++ b/examples/lpc43xx/hackrf-jellybean/ssp/Makefile
@@ -0,0 +1,24 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library. If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = sspdemo
+
+LDSCRIPT = ../jellybean-lpc4330.ld
+
+include ../../Makefile.include
diff --git a/examples/lpc43xx/hackrf-jellybean/ssp/README b/examples/lpc43xx/hackrf-jellybean/ssp/README
new file mode 100644
index 0000000..5354a53
--- /dev/null
+++ b/examples/lpc43xx/hackrf-jellybean/ssp/README
@@ -0,0 +1,48 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This program exercises the SSP1 peripheral on Jellybean's LPC43xx.
+
+ Jellybean (connector)
+ P9 SPI
+ |-----------------|
+ | Pin2 Pin4 Pin6 |
+||------| |
+|| Pin1 |Pin3 Pin5 |
+||------|----------|
+|-------|
+
+SSP1_MISO: Jellybean P9 SPI Pin6
+SSP1_MOSI: Jellybean P9 SPI Pin4
+SSP1_SCK: Jellybean P9 SPI Pin2
+SSP1_SSEL: Jellybean P9 SPI Pin3
+GND: Can be connected to P12 SD Pin1
+
+PCLK clock source is PLL1 288MHz (from IRC 96MHz boot from SPIFI)
+Freq = PCLK / (CPSDVSR * [SCR+1]).
+
+By default (CPSDVSR=0 => Means MAX Divisor)
+SSP1->CR0->SCR = 0x00 => CLK Freq 1.126MHz
+SSP1->CR0->SCR = 0x01 => MOSI Freq 566.9KHz
+...
+
+Test Oscilloscpe:
+SCR=0, CPSDVSR=32 => CLK 9.025MHz
+SCR=1, CPSDVSR=2 => CLK 73MHz
+SCR=2, CPSDVSR=2 => CLK 49MHz
+SCR=4, CPSDVSR=2 => CLK 29MHz
+SCR=8, CPSDVSR=2 => CLK 16MHz
+SCR=16, CPSDVSR=2 => CLK 8.5MHz
+SCR=32, CPSDVSR=2 => CLK 4.386MHz
+SCR=64, CPSDVSR=2 => CLK 2.227MHz
+SCR=1, CPSDVSR=64 => CLK 2.262MHz
+
+Theory:
+SCR=0, CPSDVSR=32 => 288MHz / (32*(0+1) = 9MHz
+SCR=1, CPSDVSR=2 => 288MHz / (2*(1+1) = 72MHz
+SCR=4, CPSDVSR=2 => 288MHz / (2*(4+1) = 28.8MHz
+SCR=32, CPSDVSR=2 => 288MHz / (2*(32+1) = 4.364MHz
+SCR=64, CPSDVSR=2 => 288MHz / (2*(64+1)) = 2.2154MHz
+SCR=128, CPSDVSR=2 => 288MHz / (2*(128+1)) = 1.116MHz
+SCR=1, CPSDVSR=64 => 288MHz / (64*(1+1)) = 2.25MHz
diff --git a/examples/lpc43xx/hackrf-jellybean/ssp/sspdemo.c b/examples/lpc43xx/hackrf-jellybean/ssp/sspdemo.c
new file mode 100644
index 0000000..cdb3702
--- /dev/null
+++ b/examples/lpc43xx/hackrf-jellybean/ssp/sspdemo.c
@@ -0,0 +1,102 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/lpc43xx/gpio.h>
+#include <libopencm3/lpc43xx/scu.h>
+#include <libopencm3/lpc43xx/cgu.h>
+#include <libopencm3/lpc43xx/ssp.h>
+
+#include "../jellybean_conf.h"
+
+void gpio_setup(void)
+{
+ /* Configure all GPIO as Input (safe state) */
+ GPIO0_DIR = 0;
+ GPIO1_DIR = 0;
+ GPIO2_DIR = 0;
+ GPIO3_DIR = 0;
+ GPIO4_DIR = 0;
+ GPIO5_DIR = 0;
+ GPIO6_DIR = 0;
+ GPIO7_DIR = 0;
+
+ /* Configure SCU Pin Mux as GPIO */
+ scu_pinmux(SCU_PINMUX_LED1, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_LED2, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_LED3, SCU_GPIO_FAST);
+
+ scu_pinmux(SCU_PINMUX_EN1V8, SCU_GPIO_FAST);
+
+ scu_pinmux(SCU_PINMUX_BOOT0, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT1, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT2, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT3, SCU_GPIO_FAST);
+
+ /* Configure SSP1 Peripheral (to be moved later in SSP driver) */
+ scu_pinmux(SCU_SSP1_MISO, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
+ scu_pinmux(SCU_SSP1_MOSI, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
+ scu_pinmux(SCU_SSP1_SCK, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
+ scu_pinmux(SCU_SSP1_SSEL, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
+
+ /* Configure GPIO as Output */
+ GPIO2_DIR |= (PIN_LED1|PIN_LED2|PIN_LED3); /* Configure GPIO2[1/2/8] (P4_1/2 P6_12) as output. */
+ GPIO3_DIR |= PIN_EN1V8; /* GPIO3[6] on P6_10 as output. */
+}
+
+int main(void)
+{
+ int i;
+ u8 ssp_val;
+ u8 serial_clock_rate;
+ u8 clock_prescale_rate;
+
+ gpio_setup();
+
+ /* Freq About 1.12MHz => Freq = PCLK / (CPSDVSR * [SCR+1]) with PCLK=PLL1=288MHz */
+ clock_prescale_rate = 2;
+ serial_clock_rate = 128;
+
+ ssp_init(SSP1_NUM,
+ SSP_DATA_8BITS,
+ SSP_FRAME_SPI,
+ SSP_CPOL_0_CPHA_0,
+ serial_clock_rate,
+ clock_prescale_rate,
+ SSP_MODE_NORMAL,
+ SSP_MASTER,
+ SSP_SLAVE_OUT_ENABLE);
+
+ ssp_val = 0x0;
+
+ while (1) {
+
+ ssp_write(SSP1_NUM, (u16)ssp_val);
+
+ gpio_set(GPIO2, GPIOPIN1); /* LED on */
+
+ for (i = 0; i < 1000; i++) /* Wait a bit. */
+ __asm__("nop");
+
+ gpio_clear(GPIO2, GPIOPIN1); /* LED off */
+
+ ssp_val++;
+ }
+
+ return 0;
+}